CN117833882B

CN117833882B - High-side smart electronic switches, integrated circuit chips, chip products and automobiles

Info

Publication number: CN117833882B
Application number: CN202410167206.7A
Authority: CN
Inventors: 白文利; 宋朋亮
Original assignee: Wuxi Wenxian Microelectronics Co ltd
Current assignee: Wuxi Wenxian Microelectronics Co ltd
Priority date: 2024-02-06
Filing date: 2024-02-06
Publication date: 2025-04-18
Anticipated expiration: 2044-02-06
Also published as: CN117833882A

Abstract

The present application provides a high-side intelligent electronic switch, an integrated circuit chip, a chip product and an automobile, wherein a voltage mutation detection circuit is connected between the control terminal of a power switch and the power ground terminal, and the voltage mutation detection circuit outputs a shutdown signal when a voltage mutation is detected at the control terminal of the power switch, and the control circuit is connected between the voltage mutation detection circuit and the drive circuit, and can output a cutoff control signal based on the received shutdown signal, so that the drive circuit controls the power switch to be turned off. In this solution, when a load is short-circuited, the voltage at the control terminal of the power switch will decrease rapidly to cause a mutation, so that the power switch is turned off in time when a voltage mutation is detected at the control terminal of the power switch, which can avoid the risk of the power switch being burned out.

Description

High-side intelligent electronic switch, integrated circuit chip, chip product and automobile

Technical Field

The application relates to the technical field of intelligent semiconductor switches, in particular to a high-side intelligent electronic switch, an integrated circuit chip, a chip product and an automobile.

Background

The intelligent electronic switch is generally used for coupling a load with a battery, is an electronic element for controlling the on-off of a load circuit, is widely applied to the fields of automobile electronics, industrial automation, medical equipment and the like, and has high reliability requirements in practical application because of various connected load types and harsh working environments, wherein the load short-circuit protection of the intelligent electronic switch is an important one of the reliability requirements.

In the prior art, load short-circuit protection of an intelligent electronic switch means that the power switch in the intelligent electronic switch is controlled to be turned off and turned off when a load is in short circuit, so that the damage caused by overhigh temperature of the power switch is prevented. Specifically, a temperature detection circuit is arranged in the intelligent electronic switch, when the power switch is in an on state, if a load connected with the power switch is short-circuited, the output current on the power switch can be instantaneously increased, the power switch rapidly heats, the temperature detection circuit triggers a temperature protection mechanism when detecting that the temperature of the power switch is too high, so that the power switch is turned off and turned off, and when the temperature is reduced to be below a set over-temperature protection threshold value, the power switch is controlled to be turned on and turned on, so that the risk that a power switch tube is burnt out is effectively avoided.

However, in practical applications, the response time of the temperature detection circuit is limited by the relative position of the temperature sensor and the power switch, the detection sensitivity of the temperature sensor, and other factors, and the above solution may have a problem that the power switch is burnt out due to untimely response of the temperature detection circuit.

Disclosure of Invention

The application provides a high-side intelligent electronic switch, an integrated circuit chip, a chip product and an automobile, which are used for solving the problems of low reliability and short service life of a power switch in the high-side intelligent electronic switch.

In a first aspect, the application provides a high-side intelligent electronic switch, which comprises a power supply end, a power supply grounding end, a load output end, a power switch, a voltage abrupt change detection circuit, a control circuit and a driving circuit;

The power supply end and the power ground end are used for being connected with a battery, and the load output end is used for being connected with a load;

The power switch is used for being connected with a load in series, the first end of the power switch is connected with a power supply end of a power supply, the second end of the power switch is connected with an output end of the load, the control end of the power switch is connected with the driving circuit, and the driving circuit is used for controlling the power switch to be turned on, turned off or turned on;

The first end of the voltage jump detection circuit is connected with the control end of the power switch, the second end of the voltage jump detection circuit is connected with the power supply grounding end, the output end of the voltage jump detection circuit is connected with the control circuit, the control circuit is also connected with the driving circuit, the driving circuit is also connected with the second end of the power switch, and the control circuit is used for controlling the working state of the driving circuit;

the voltage abrupt change detection circuit outputs a turn-off signal when the voltage of the control end of the power switch is abrupt change, and the control circuit outputs a turn-off control signal based on the received turn-off signal so that the driving circuit controls the power switch to turn off.

In one possible design of the first aspect, the voltage jump detection circuit is configured to obtain a voltage of a control terminal of the power switch when in operation, and determine whether the voltage of the control terminal is suddenly changed according to information about a voltage change of the control terminal of the power switch relative to the power ground terminal.

As an example, the voltage jump detection circuit includes a first enabling terminal and a second enabling terminal, the first enabling terminal is used for accessing a driving control signal, the driving control signal is an on control signal or an off control signal, the second enabling terminal is used for accessing a protection signal or a non-protection signal, and the control circuit is also used for accessing one of the protection signal and the non-protection signal and the driving control signal;

The power switch comprises a power switch, a voltage jump detection circuit, a driving circuit and a control circuit, wherein the power switch is used for switching on and off a power switch, the voltage jump detection circuit is not operated when receiving a switching-off control signal and/or a protection signal, and is operated when simultaneously receiving a switching-on control signal and a non-protection signal, and the control circuit is also used for controlling the power switch to be switched off and cut off through the driving circuit when receiving the switching-off control signal and/or the protection signal.

As another example, the voltage jump detection circuit includes an enable terminal for accessing a protection signal or a non-protection signal;

the voltage jump detection circuit is not operated when a protection signal is received, and is operated when a non-protection signal is received.

Optionally, the voltage change information includes a magnitude relation between time information required by the voltage of the control terminal to drop from a first voltage threshold to a second voltage threshold and reference time information, the second voltage threshold is smaller than the first voltage threshold and the second voltage threshold is larger than a maximum voltage value of the control terminal relative to the load output terminal when the power switch is normally turned on;

The voltage jump detection circuit comprises a first comparison unit, a second comparison unit, a timing unit and a third comparison unit, wherein a first input end of the first comparison unit and a first input end of the second comparison unit are both connected with a control end of the power switch, a second input end of the first comparison unit is used for being connected with a first voltage threshold value, a second input end of the second comparison unit is used for being connected with a second voltage threshold value, an output end of the first comparison unit is connected with the timing unit, an output end of the second comparison unit is connected with an enabling end of the third comparison unit, the timing unit is also connected with a first input end of the third comparison unit, and a second input end of the third comparison unit is used for being connected with reference time information;

the first comparison unit outputs a timing signal when the voltage of the control end of the power switch is smaller than or equal to a first voltage threshold, the timing unit starts timing and outputs real-time timing information when receiving the timing signal, the second comparison unit outputs an enabling signal when the voltage of the control end of the power switch is smaller than or equal to a second voltage threshold, the third comparison unit compares current timing information of the timing unit with the reference time information when receiving the enabling signal, and outputs the turn-off signal when the current timing information is smaller than or equal to the reference time information.

Optionally, the voltage change information includes a magnitude relation between a voltage of the control terminal and a second voltage threshold when the reference time information passes from a first moment, where the first moment is a moment when the voltage of the control terminal drops to the first voltage threshold, the second voltage threshold is smaller than the first voltage threshold, and the second voltage threshold is larger than a voltage value of the control terminal relative to the load output terminal when the power switch is normally turned on;

the voltage jump detection circuit comprises a first comparison unit, a timing unit, a second comparison unit and a third comparison unit, wherein a first input end of the first comparison unit and a first input end of the second comparison unit are both connected with a control end of the power switch, a second input end of the first comparison unit is used for being connected with a first voltage threshold value, a second input end of the second comparison unit is used for being connected with a second voltage threshold value, an output end of the first comparison unit is connected with the timing unit, the timing unit is also connected with a first input end of the third comparison unit, a second input end of the third comparison unit is used for being connected with reference time information, and an output end of the third comparison unit is connected with an enabling end of the second comparison unit;

The first comparison unit outputs a timing signal when the voltage of the control end of the power switch is smaller than or equal to a first voltage threshold, the timing unit starts timing and outputs real-time timing information when receiving the timing signal, the third comparison unit outputs an enabling signal when the real-time timing information reaches the reference time information, the second comparison unit compares the current control end voltage of the power switch with a second voltage threshold when receiving the enabling signal, and the turn-off signal is output when the current control end voltage is smaller than or equal to the second voltage threshold.

In another possible design of the first aspect, the driving circuit includes a charging unit, a charging switch, and a discharging switch;

The charging unit is connected in series with the charging switch to form a charging branch, one end of the charging branch is connected with a first power supply end, the other end of the charging branch is connected with a control end of the power switch, two ends of the discharging switch are correspondingly connected with a control end and a second end of the power switch, and the control end of the charging switch and the control end of the discharging switch are both connected with the control circuit;

When the control circuit outputs the cut-off control signal, the charging switch is turned off and turned on, and the discharging switch is turned on to discharge the charge of the control end of the power switch, so that the power switch is turned off and turned off.

In a further possible design of the first aspect, the driving circuit comprises a driving unit and a switching unit;

The driving unit and the switching unit are connected with the control circuit, the driving unit and the switching unit are also connected with the second end of the power switch, the driving unit is used for controlling the power switch to be turned on or turned off, and the switching unit is used for discharging the charge of the control end of the power switch when turned on;

And the control circuit controls the switch unit to be turned on and turned off when receiving the turn-off signal so as to rapidly release the charge of the control end of the power switch, so that the power switch is turned off and turned off.

In yet another possible design of the first aspect, the control circuit includes a latch unit and a logic control unit;

The first input end of the latch unit is connected with the output end of the voltage jump detection circuit, the second input end of the latch unit is used for being connected with a driving control signal, the output end of the latch unit is connected with the logic control unit, and the driving control signal is an on control signal or an off control signal;

The latch unit enters a locking state and continuously outputs a first intermediate signal when receiving the turn-off signal during the period of receiving the turn-on control signal, so that the logic control unit continuously outputs the turn-off control signal, and releases the locking state when receiving the turn-off control signal when in the locking state.

the first input end of the latch unit is connected with the output end of the voltage jump detection circuit, the output end of the latch unit is connected with the logic control unit, and the logic control unit is also used for accessing a driving control signal;

The latch unit is used for entering a locking state and continuously outputting a first intermediate signal when receiving the turn-off signal, and the logic control unit is used for shielding the driving control signal and outputting the cut-off control signal when receiving the first intermediate signal.

Optionally, the high-side intelligent electronic switch further comprises a turn-off detection circuit, and the turn-off detection circuit is connected with the second input end of the latch unit;

The turn-off detection circuit is used for detecting whether the power switch is completely turned off or not, outputting an unlocking signal when the power switch is determined to be completely turned off, and unlocking the locking unit when the unlocking signal is received.

Optionally, the turn-off detection circuit includes a voltage detection unit;

the first end of the voltage detection unit is connected with the control end of the power switch, the second end of the voltage detection unit is connected with the second end of the power switch, the output end of the voltage detection unit is connected with the second input end of the latch unit, and the voltage detection unit is used for detecting a gate-source voltage signal of the power switch and outputting an unlocking signal when the gate-source voltage signal is equal to zero.

Optionally, the high-side intelligent electronic switch further comprises a delay circuit;

The input end of the delay circuit is connected with the output end of the turn-off detection circuit, the output end of the delay circuit is connected with the second input end of the latch unit, the delay circuit is used for outputting a delayed unlocking signal when the unlocking signal is received to start timing and when continuous timing information reaches preset time information, and the latch unit is used for unlocking the locking state when receiving the delayed unlocking signal.

In a further possible design of the first aspect, the power switch is any one of an NMOS transistor, a JFET, and/or the power switch is implemented as a silicon device, silicon carbide, gallium arsenide, or gallium nitride.

In a second aspect, an embodiment of the present application provides an integrated circuit chip, including the high-side intelligent electronic switch according to the first aspect and the possible designs, wherein the power supply terminal is a power supply pin, the power ground terminal is a power ground pin, and the load output terminal is a load output pin.

In a third aspect, an embodiment of the present application provides a chip product, including the high-side intelligent electronic switch according to the first aspect and each possible design, where elements of the high-side intelligent electronic switch except for a power switch are located on a first integrated circuit chip, and the power switch is located on a second integrated circuit chip;

The power supply end is a power supply pin, the power supply grounding end is a power supply grounding pin, the load output end is a load output pin, the power supply pin and the power supply grounding pin are located on a first integrated circuit chip, and the load output pin is located on a second integrated circuit chip.

In a fourth aspect, an embodiment of the present application provides an automobile, including the high-side intelligent electronic switch according to the first aspect and each possible design, or the integrated circuit chip according to the second aspect, or the chip product according to the third aspect;

The intelligent electronic switch further comprises a battery, a load and a microprocessor, wherein the positive electrode of the battery is connected with a power supply end of a power supply, the negative electrode of the battery is connected with a power supply grounding end, one end of the load is connected with a load output end, the other end of the load is connected with the power supply grounding end or the power supply end, and the microprocessor is connected with the high-side intelligent electronic switch.

Optionally, the vehicle is an electric vehicle, a hybrid vehicle or a fuel vehicle, and the load includes at least one of a resistive load, an inductive load and a capacitive load.

According to the high-side intelligent electronic switch, the integrated circuit chip, the chip product and the automobile, the voltage mutation detection circuit is connected between the control end of the power switch and the power supply grounding end, the voltage mutation detection circuit outputs a turn-off signal when detecting that the voltage of the control end of the power switch is suddenly changed, the control circuit is connected between the voltage mutation detection circuit and the driving circuit, and the turn-off control signal can be output based on the received turn-off signal, so that the driving circuit can control the power switch to be turned off. In the scheme, when a load is short-circuited, the voltage of the control end of the power switch can be rapidly reduced to generate a sudden change phenomenon, so that the power switch is turned off in time when the sudden change of the voltage of the control end of the power switch is detected, and the risk of burning out the power switch can be avoided.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.

Fig. 1 is a schematic diagram of a circuit module of a high-side intelligent electronic switch, a battery, a load, etc. according to a first embodiment of the present application;

FIG. 2A is a schematic diagram of one possible control scheme of the high-side intelligent electronic switch of FIG. 1;

FIG. 2B is a schematic diagram of another possible control scheme of the high-side intelligent electronic switch of FIG. 1;

Fig. 3A is a schematic circuit diagram of a voltage jump detecting circuit in a high-side intelligent electronic switch according to an embodiment of the present application;

FIG. 3B is a graph showing the voltage of the control terminal of FIG. 3A over time;

Fig. 3C is a schematic diagram of another circuit module of the voltage jump detection circuit in the high-side intelligent electronic switch according to the embodiment of the present application;

FIG. 3D is a graph showing the voltage of the control terminal of FIG. 3C over time;

FIG. 4A is a schematic diagram of a circuit module of a high-side intelligent electronic switch, battery, load, etc. according to a second embodiment of the present application;

FIG. 4B is a schematic diagram of another circuit module of the high-side intelligent electronic switch, battery, load, etc. according to the second embodiment of the present application;

FIG. 5A is a schematic diagram of a circuit module of a high-side intelligent electronic switch, battery, load, etc. according to a third embodiment of the present application;

FIG. 5B is a schematic diagram of another circuit module of the high-side intelligent electronic switch, battery, load, etc. provided by the third embodiment of the present application;

Fig. 6 is a schematic diagram of a circuit module of a high-side intelligent electronic switch, a battery, a load, etc. according to a fourth embodiment of the present application.

Specific embodiments of the present application have been shown by way of the above drawings and will be described in more detail below. The drawings and the written description are not intended to limit the scope of the inventive concepts in any way, but rather to illustrate the inventive concepts to those skilled in the art by reference to the specific embodiments.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The terms "comprising" and "having" and any variations thereof, as used in the description, claims and drawings, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or modules is not limited to only those steps or units listed but may alternatively include other steps or units not listed or inherent to such process, method, article, or apparatus.

Furthermore, the terms "first," "second," and "third," etc. are used for distinguishing between different objects and not for describing a particular sequential order. The electrical connection of the present application includes direct electrical connection and indirect electrical connection, where indirect electrical connection refers to that other electronic components, pins, etc. may exist between two components of the electrical connection. The XX end referred to in the present application may or may not be an actual terminal, for example, only one end of a component or one end of a wire. The term "and/or" as referred to herein encompasses three situations, for example, three situations, A and/or B encompasses A, B, A and B.

In recent years, with the growth of automobile markets, particularly the explosion of electric automobile markets, such as electric passenger car markets and electric business car markets, the demands for automobile electronic components are increasing. The electronic component in the automobile with relatively high demands is a relay for switching on or off a load line. However, the relay itself has some drawbacks such as long on and off delay time, expensive and bulky. Thus, as semiconductor technology evolves, relays are increasingly replaced by intelligent electronic switches, which are commonly used to couple a load to a battery, which is an automatically operated electrical switch having one or more diagnostic capabilities and protection features, such as protection against over-current, over-temperature, overload, and short-circuit events. For example, the intelligent electronic switch is provided with a power switch, so that the power switch can be turned off and cut off under the conditions of overcurrent, over-temperature, overload or short circuit and the like, so that a passage between a battery and a load is disconnected, the power switch is further protected from being damaged, and the reliability of the intelligent electronic switch is improved.

In practical application, especially when the load types connected with the power switch are various (such as inductance, capacitance, resistance or a combination of the inductance, capacitance and resistance) and the working environment is harsh, the possibility of overcurrent, overtemperature, overload and short circuit events of the intelligent electronic switch is high, so that the reliability requirement of the application end on the intelligent electronic switch is increased.

Among the one or more diagnostic capabilities and protection features of the intelligent electronic switch, short-circuit protection is an important item, when the power switch is turned on and if a load connected to the power switch is shorted, uncontrollable current flows from the battery to the ground through the power switch, which may cause excessive instantaneous short-circuit power borne by the power switch due to excessive current flowing through the power switch, and thus cause the power switch to be burnt.

In the related art, in order to avoid the power switch from being burnt out, a temperature detection circuit may be disposed around the power switch, so when the power on the power switch instantaneously becomes large to cause the power switch to rapidly generate heat, if the temperature detection circuit detects that the temperature of the power switch exceeds the over-temperature protection threshold, a temperature protection mechanism is triggered to turn off the power switch, but the temperature detection circuit may have a problem of untimely response, so that the power switch cannot be turned off in time, and still there is a risk of possible burning out.

In view of the above technical problems, the inventor of the present application has provided a new technical idea through long-term research, and determines whether to turn off the power switch by judging whether the voltage of the control terminal of the power switch is suddenly changed, wherein the power switch is directly turned off when the voltage of the control terminal of the power switch is suddenly changed, so that the risk that the power switch is damaged due to overhigh temperature can be avoided.

Based on the technical conception, the embodiment of the application provides a high-side intelligent electronic switch, a voltage abrupt change detection circuit is connected between a control end and a power supply grounding end of the power switch, the voltage abrupt change detection circuit outputs a turn-off signal when detecting that the voltage of the control end of the power switch is abrupt change, and a control circuit is connected between the voltage abrupt change detection circuit and a driving circuit and can output a turn-off control signal based on the received turn-off signal so that the driving circuit controls the power switch to turn off. In the scheme, when a load is short-circuited, the voltage of the control end of the power switch can be rapidly reduced to generate a sudden change phenomenon, so that the power switch is turned off in time when the sudden change of the voltage of the control end of the power switch is detected, and the risk of burning out the power switch can be avoided.

The following describes the technical scheme of the present application and how the technical scheme of the present application solves the above technical problems in detail with specific embodiments. The following embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.

In this embodiment, a high-side intelligent electronic switch for handling load short-circuits is provided, and fig. 1 is a schematic circuit diagram of a high-side intelligent electronic switch, a battery, a load, and the like according to a first embodiment of the present application. As shown in fig. 1, the high-side intelligent electronic switch 20 may include a power supply terminal VBAT, a power ground terminal GND, a load output terminal OUT, a power switch Q1, a voltage abrupt detecting circuit 21, a control circuit 22, and a driving circuit 23. Wherein the power supply terminal VBAT and the power ground terminal GND are used for connection to the battery 10, and the load output terminal OUT is used for connection to the load 30.

With continued reference to fig. 1, the power switch Q1 is configured to be connected in series with the load 30, a first end thereof is connected to the power supply terminal VBAT, a second end thereof is connected to the load output terminal OUT, a control end thereof is connected to the driving circuit 23, and the driving circuit 23 is configured to control the power switch Q1 to be turned on, turned off, or turned on. It will be appreciated that in embodiments of the present application, the power switch Q1 is connected as a high-side switch, i.e., a switch connected between the mains supply VBAT and the load 30.

In this embodiment, the voltage jump detecting circuit 21 has a first end connected to the control end of the power switch Q1, a second end connected to the power ground GND, an output end connected to the control circuit 22, and the control circuit 22 is further connected to the driving circuit 23, and the driving circuit 23 is further connected to the second end of the power switch Q1.

For example, the voltage abrupt detecting circuit 21 may output a turn-off signal when the voltage of the control terminal of the power switch Q1 abruptly changes, and accordingly, the control circuit 22 outputs a turn-off control signal based on the received turn-off signal, so that the driving circuit 23 controls the power switch Q1 to turn off.

Alternatively, in this embodiment, the power switch Q1 may be an N-type Metal-Oxide-semiconductor field effect Transistor (N Metal-Oxide-Semiconductor Field-Effect Transistor, NMOS FET, or NMOS Transistor), a Junction FIELD EFFECT Transistor (JFET), or an insulated gate bipolar Transistor (Insulated Gate Bipolar Transistor, or IGBT), which is illustrated as an N-type MOS Transistor. In yet another possible design of the present embodiment, the power switch Q1 may be implemented as a silicon device, or may be implemented using other semiconductor materials, for example, silicon carbide (SiC), gallium arsenide (GaAs), gallium nitride (GaN), or the like, and the embodiment of the present application is not limited to the representation of the power switch Q1. It can be appreciated that in this embodiment, the power switch Q1 is an NMOS transistor connected as a high-side switch.

In general, the voltage of the control terminal (gate voltage) of the power switch Q1 is equal to the sum of the gate-source voltage and the source voltage, when the power switch Q1 works normally, the drain-source voltage of the power switch Q1 is smaller, the source voltage of the power switch Q1 is approximately equal to the voltage of the power supply terminal VBAT, the voltage of the control terminal is approximately equal to vbat+vgs, once the load 30 is shorted, the source voltage of the power switch Q1 is equivalent to being directly connected with the power ground GND, so that the source voltage of the power switch Q1 is rapidly reduced from the voltage of the power supply terminal VBAT to approximately equal to 0, and the corresponding voltage of the control terminal of the power switch Q1 is approximately equal to 0+vgs, that is, the gate voltage is rapidly reduced, so that the gate voltage of the power switch Q1 is suddenly changed. Thus, in the present embodiment, the voltage abrupt change detection circuit 21 is configured to detect whether the control terminal voltage of the power switch Q1 is abruptly changed, and may also be understood as detecting whether the load 30 connected to the power switch Q1 is shorted.

Alternatively, in an embodiment of the present application, in order to protect the power switch Q1 from being burned out, the voltage abrupt change detection circuit 21 may output a turn-off signal when detecting that the gate voltage of the power switch Q1 is abrupt, so that the control circuit 22 outputs a turn-off control signal to cause the driving circuit 23 to immediately turn off and turn off the power switch Q1.

In the high-side intelligent electronic switch provided by the embodiment of the application, the voltage mutation detection circuit is utilized to detect whether the voltage of the control end of the power switch is suddenly changed or not so as to judge whether the load is in short circuit or not, a turn-off signal is output to the control circuit when the sudden change is determined to occur, and the control circuit can output the turn-off control signal based on the turn-off signal so as to enable the drive circuit to control the power switch to be turned off and turned off, so that the power switch can be detected in time and turned off rapidly when the load is in short circuit, and the aim of protecting the power switch from being damaged is fulfilled.

Optionally, a fuse 40 may be connected in series between the battery 10 and the power supply VBAT to prevent a fault caused by excessive current on the line. Other elements, such as a reverse connection preventing diode and a current limiting resistor connected in parallel, may be disposed between the power ground GND and the negative electrode of the battery 10 to improve the stability of the high-side intelligent electronic switch 20.

Optionally, in the schematic diagram shown in fig. 1, the connection relationship between the voltage jump detecting circuit 21, the control circuit 22, the driving circuit 23, and the like and the power supply unit is not shown, but in practical application, the power supply unit may be disposed inside the high-side intelligent electronic switch 20, and the power supply unit inside is connected to the power supply end VBAT of the power supply, so as to reduce or boost the voltage of the power supply end VBAT of the power supply, so that the processed voltage can meet the power supply requirement of each internal circuit, and then be provided to the corresponding circuit, so that the circuit normally works. In other embodiments, the power supply unit may not be disposed inside the high-side intelligent electronic switch 20, and a step-up or step-down unit may be disposed between the power supply terminal VBAT and the positive electrode of the battery 10 to raise or lower the voltage input to the power supply terminal VBAT to the rated operating voltage of the high-side intelligent electronic switch 20, so that the voltage at the power supply terminal VBAT may directly supply power to some circuits inside the high-side intelligent electronic switch 20, thereby ensuring that the high-side intelligent electronic switch 20 can operate normally.

The foregoing embodiments have been generally described for the high-side intelligent electronic switch 20, and the specific implementation of the voltage jump detection circuit 21, the control circuit 22, and the driving circuit 23 in the high-side intelligent electronic switch 20 will be explained in the following by different embodiments.

Optionally, in the embodiment of the present application, the voltage abrupt change detection circuit 21 is configured to obtain the voltage of the control terminal of the power switch Q1 when in operation, and determine whether the voltage of the control terminal of the power switch Q1 is abrupt according to the voltage change information of the control terminal of the power switch Q1 relative to the power ground GND.

For example, since one end of the voltage jump detecting circuit 21 is connected to the control terminal of the power switch Q1 and the other end is connected to the power ground GND, the voltage jump detecting circuit 21 actually obtains the voltage of the control terminal of the power switch Q1 relative to the power ground GND, further analyzes the change condition of the voltage, and determines whether the voltage of the control terminal of the power switch Q1 is suddenly changed according to the voltage change information.

Alternatively, in an embodiment of the present application, the high-side intelligent electronic switch 20 may further be externally connected to a microprocessor, and the on-off state of the power switch Q1 is controlled based on a driving control signal (Input signal) received from the microprocessor. The protection mechanism of the power switch Q1 may also be disposed inside the high-side intelligent electronic switch 20, for example, when the power switch Q1 triggers the high-side intelligent electronic switch 20 to generate a protection signal due to overcurrent, overheat, etc., the high-side intelligent electronic switch 20 may control the power switch Q1 to be turned off based on the protection signal.

In one possible design, in order to enable the high-side intelligent electronic switch 20 to distinguish between the abrupt change of the control terminal voltage caused by the short circuit of the load and the abrupt change of the control terminal voltage caused by the turn-off and turn-off of the power switch Q1 controlled by the driving control signal (Input signal), and the abrupt change of the control terminal voltage caused by the turn-off and turn-off of the power switch Q1 controlled by the protection mechanism (over temperature, over current, etc.), in this embodiment, the following scheme may be adopted.

By way of example, fig. 2A is a schematic diagram of one possible control scheme of the high-side intelligent electronic switch shown in fig. 1. As shown in fig. 2A, the voltage jump detection circuit 21 includes a first enable terminal E1 and a second enable terminal E2, where the first enable terminal E1 is used for accessing a driving control signal Input, the driving control signal is an ON control signal ON or an OFF control signal OFF, the second enable terminal E1 is used for accessing a protection signal or a non-protection signal, and the control circuit is also used for accessing one of the protection signal and the non-protection signal and the driving control signal Input. In an embodiment of the application, a non-protection signal may be understood as a non-signal of a protection signal.

Wherein the voltage jump detection circuit 21, which is not operated when receiving the OFF control signal OFF and/or the protection signal, is operated when receiving the ON control signal ON and the non-protection signal at the same time, the control circuit 22 is further configured to control the power switch Q1 to be turned OFF via the driving circuit 23 when receiving the OFF control signal OFF and/or the protection signal.

As an example, the voltage jump detection circuit 21 does not operate when receiving the OFF control signal OFF and/or the protection signal, and thus, when the control circuit 22 controls the power switch Q1 to turn OFF via the driving circuit 23 based on the received OFF control signal OFF and/or the protection signal, the voltage jump detection circuit 21 does not detect whether the control terminal voltage of the power switch Q1 is suddenly changed, so that the OFF signal is not output, and the enable control circuit 20 can control the driving circuit 23 to turn OFF the power switch Q1 based on the existing OFF mechanism.

As another example, when the voltage jump detecting circuit 21 receives the on control signal from the first enabling terminal E1 and does not receive the protection signal (i.e. the received non-protection signal is also interpreted as a non-signal of the protection signal), the voltage jump detecting circuit 21 operates normally, and when the voltage jump detecting circuit 21 detects that the voltage of the control terminal of the power switch Q1 is suddenly changed during the normal operation, the voltage jump detecting circuit 21 outputs an off signal, so as to prompt the control circuit 22 to output the off signal, thereby rapidly turning off the power switch Q1 through the driving circuit 23.

In this embodiment, by setting the enabling condition of the voltage jump detecting circuit 21, that is, only when the on control signal is received and the protection signal is not received, the voltage jump of the control terminal caused by the load short circuit and the voltage jump of the control terminal caused by the power switch that is normally turned off and the power switch triggered by the protection mechanism is accurately distinguished, so that the performance of the high-side intelligent electronic switch is improved.

In the present embodiment, the driving circuit 23 is used to control the switching state of the power switch Q1, and thus, the circuit structure of the driving circuit 23 can affect the turn-off speed of the power switch Q1, and can affect the safety of the power switch Q1 to a great extent. Alternatively, based on the embodiment shown in fig. 2A, an improved driving circuit is described below, so that it increases the turn-off speed of the power switch upon receiving the turn-off signal.

In another possible design, in order to enable the high-side intelligent electronic switch 20 to distinguish between the abrupt change of the control terminal voltage caused by the short-circuit of the load and the abrupt change of the control terminal voltage caused by the turn-off and turn-off of the power switch Q1 controlled by the protection mechanism (over-temperature, over-current, etc.), the following scheme may be adopted.

By way of example, fig. 2B is a schematic diagram of another possible control scheme of the high-side intelligent electronic switch shown in fig. 1. As shown in fig. 2B, the voltage jump detection circuit 21 includes an enable terminal E for accessing the protection signal or the non-protection signal, and accordingly, the voltage jump detection circuit 21 is not operated when the protection signal is received and is operated when the non-protection signal is received.

In this embodiment, the voltage abrupt change detection circuit 21 does not operate when receiving the protection signal, so that the control circuit 22 can control the power switch Q1 to turn off and turn off via the driving circuit 23 based on the received protection signal, the voltage abrupt change detection circuit 21 will not detect whether the control terminal voltage of the power switch Q1 is abrupt or not, and the enable control circuit 20 will turn off the power switch Q1 based on the control of the driving circuit 23 according to the existing turn-off mechanism. However, when the voltage abrupt detecting circuit 21 does not receive the protection signal from the enable terminal E, the voltage abrupt detecting circuit 21 operates normally, and outputs a turn-off signal when detecting that the voltage of the control terminal of the power switch Q1 is abrupt, causing the control circuit 22 to output the turn-off signal, thereby rapidly turning off the power switch Q1 through the driving circuit 23.

In this embodiment, by setting the enabling condition of the voltage jump detecting circuit 21, that is, only when the protection signal is not received, it can accurately distinguish the voltage jump of the control terminal caused by the load short circuit from the voltage jump of the control terminal caused by the power switch turn-off triggered by the protection mechanism, so as to improve the performance of the high-side intelligent electronic switch.

Alternatively, based on the above embodiment, the voltage jump detecting circuit 21 determines whether the voltage of the control terminal is suddenly changed according to the voltage change information of the control terminal of the power switch Q1 relative to the power ground GND. For example, by setting two voltage thresholds (a first voltage threshold Vref1 and a second voltage threshold Vref 2) and one reference time information Tref in the voltage abrupt change detection circuit 21, the change of the control terminal voltage is sequentially measured, and further, whether the control terminal voltage of the power switch Q1 is abrupt change is determined.

The first voltage threshold Vref1 and the second voltage threshold Vref2 are two working voltages of the control terminal relative to the power ground GND when the power switch Q1 is normally turned on, the second voltage threshold Vref2 is smaller than the first voltage threshold Vref1 and larger than a maximum voltage value of the control terminal relative to the load output terminal when the power switch Q1 is normally turned on, and the reference time information Tref is theoretical time information of the control terminal voltage falling from the first voltage threshold Vref1 to the second voltage threshold Vref 2.

In this embodiment, when the load is short-circuited, the voltage Vgs of the control end of the power switch Q1 relative to the load output end is equal to 4V, the voltage Vgs of the power supply end VBAT relative to the power ground end GND is equal to 12V, and the voltage Vgs of the control end relative to the power ground end GND is greater than 4V and less than or equal to 16V, so that the first voltage threshold Vref1 and the second voltage threshold Vref2 may be two voltage values between 4V and 16V, for example, the first voltage threshold Vref1 is 15.5V, 15V, 14.5V, 14V, 13.5V, 13V, 12.5V, 12V, 11.5V, 11V, 10.5V, 10V, etc., the second voltage threshold Vref2 is 4.5V, 5V, 5.5V, 6V, 6.5V, 7.5V, 15V, etc., and the second voltage threshold Vref2 may be set as the actual threshold value, and the first voltage threshold Vref1 and the second voltage Vref2 may be different from the actual threshold value. The reference time information Tref may be set based on specific values of the first voltage threshold Vref1 and the second voltage threshold Vref2 and time information required for the control terminal voltage to drop from the first voltage threshold Vref1 to the second voltage threshold Vref2 when the power switch Q1 is normally turned off, which may be determined through calculation or experience.

In practical application, the slope of the control terminal voltage caused by the load short circuit is larger than the slope of the curve when the power switch Q1 is normally turned off, and the voltage abrupt change detection circuit can be designed based on the principle to judge whether the control terminal voltage of the power switch Q1 is abrupt change or not. For example, in the present embodiment, when the power switch Q1 is normally turned off, the slope of the control terminal voltage is a, and the slope of the control terminal voltage determined by the first voltage threshold Vref1, the second voltage threshold Vref2, and the reference time information Tref is B, then B is greater than a.

Optionally, in one possible design, the voltage variation information includes a magnitude relation between time information required for the control terminal voltage to drop from the first voltage threshold Vref1 to the second voltage threshold Vref2, and the reference time information Tref, where the second voltage threshold Vref2 is smaller than the first voltage threshold Vref1 and the second voltage threshold Vref2 is greater than a maximum voltage value of the control terminal relative to the load output terminal OUT when the power switch Q1 is normally turned on.

Fig. 3A is a schematic circuit diagram of a voltage jump detecting circuit in a high-side intelligent electronic switch according to an embodiment of the present application. FIG. 3B is a graph showing the voltage of the control terminal of FIG. 3A over time. The present embodiment explains one circuit configuration and implementation principle of the voltage abrupt detecting circuit 21. As shown in fig. 3A, in this possible design, the voltage jump detection circuit 21 includes a first comparison unit Comp11, a second comparison unit Comp12, a timing unit 21A, and a third comparison unit Comp13.

Optionally, referring to fig. 3A, a first input end of the first comparing unit Comp11 and a first input end of the second comparing unit Comp12 are both connected to the control end of the power switch Q1, a second input end of the first comparing unit Comp11 is used for accessing the first voltage threshold Vref1, a second input end of the second comparing unit Comp12 is used for accessing the second voltage threshold Vref2, an output end of the first comparing unit Comp11 is connected to the timing unit 21A, an output end of the second comparing unit Comp12 is connected to the enable end EN of the third comparing unit Comp13, the timing unit 21A is further connected to the first input end of the third comparing unit Comp13, and a second input end of the third comparing unit Comp13 is used for accessing the reference time information Tref.

In this embodiment, as shown in fig. 3B, the first comparing unit Comp11 outputs a timing signal when the voltage of the control terminal of the power switch Q1 is less than or equal to the first voltage threshold Vref1, the timing unit 21A starts timing and outputs real-time timing information when receiving the timing signal, the second comparing unit Comp12 outputs an enable signal when the voltage of the control terminal of the power switch Q1 is less than or equal to the second voltage threshold Vref2, and the third comparing unit Comp13 compares the current timing information t1 of the timing unit 21A with the reference time information Tref when receiving the enable signal, and outputs a turn-off signal when the current timing information t1 is less than or equal to the reference time information Tref.

In the embodiment of the present application, the first input terminal of the comparing unit (the first comparing unit Comp11, the second comparing unit Comp12, the third comparing unit Comp 13) is an inverting terminal, the second input terminal is a non-inverting terminal for explanation, and the turn-off signal is a high level signal. In the voltage abrupt change detection circuit 21, it is possible to determine whether or not the control terminal voltage has an abrupt change by comparing time information required for the control terminal voltage to drop from the first voltage threshold Vref1 to the second voltage threshold Vref2 with the reference time information Tref.

In this embodiment, as shown in fig. 3A and 3B, the first comparing unit Comp11 compares the control terminal voltage Vg of the power switch Q1 with the first voltage threshold Vref1, when the control terminal voltage Vg1 is less than or equal to the first voltage threshold Vref1, the first comparing unit Comp11 determines that the control terminal voltage drops to be less than or equal to the first voltage threshold Vref1, and outputs a timing signal, so that the timing unit 21A starts timing and outputs a real-time timing duration, the second comparing unit Comp12 compares the control terminal voltage Vg of the power switch Q1 with the second voltage threshold Vref2, when the control terminal voltage Vg2 is less than or equal to the second voltage threshold Vref2, the second comparing unit determines that the control terminal voltage drops to be less than or equal to the second voltage threshold Vref2, and then outputs an enabling signal, and triggers the third comparing unit Comp13 to start working, and if the current timing information t1 of the timing unit 21A is compared with reference time information, and if the current timing information t1 is less than or equal to the reference time information, the first comparing unit is considered that the control terminal voltage Tref is smaller than or equal to the second voltage threshold Vref2, and the current timing information Tref is considered to be greater than the reference time information, and the control terminal voltage Tref is greater than or equal to the first voltage threshold voltage Vref1, and the slope of the control terminal voltage is considered to be greater than the reference time information is greater. If the current timing information t1 is greater than the reference time information Tref, the time information required by the control terminal voltage to drop from the first voltage threshold Vref1 to the second voltage threshold Vref2 is longer than the first reference time Tref, the curve slope of the control terminal voltage is smaller, and if the control terminal voltage is considered to not have voltage abrupt change, the shutdown signal is not output.

It can be understood that in this embodiment, the principle of measuring whether the voltage of the control terminal suddenly changes can be summarized as the magnitude relation between the time information t1 required by the voltage drop of the control terminal for the preset voltage (the difference value between the first voltage threshold Vref1 and the second voltage threshold Vref 2) and the reference time information Tref, if the current timing information t1 is smaller than or equal to the reference time information Tref, the voltage of the control terminal is considered to suddenly change, and if the current timing information t1 is greater than the reference time information Tref, the voltage of the control terminal is considered not to suddenly change.

In another possible design, the voltage change information includes a magnitude relation between the control terminal voltage and the second voltage threshold Vref2 when the reference time information passes from a first time when the control terminal voltage drops to the first voltage threshold Vref1, the second voltage threshold Vref2 is smaller than the first voltage threshold Vref1, and the second voltage threshold Vref2 is larger than a voltage value of the control terminal relative to the load output terminal when the power switch Q1 is normally turned on.

Fig. 3C is a schematic diagram of another circuit module of the voltage jump detecting circuit in the high-side intelligent electronic switch according to the embodiment of the present application. FIG. 3D is a graph showing the voltage of the control terminal of FIG. 3C over time. The present embodiment explains another circuit configuration and implementation principle of the voltage abrupt detecting circuit 21. As shown in fig. 3C, in this possible design, the voltage jump detection circuit 21 includes a first comparison unit Comp21, a timing unit 21B, a second comparison unit Comp22, and a third comparison unit Comp23. Fig. 3C is somewhat similar to the structure of fig. 3A, and is different in that in fig. 3A, whether the control terminal voltage suddenly changes is determined based on the magnitude relation between the time information required for decreasing the preset voltage and the reference time information Tref, and in fig. 3C, whether the control terminal voltage suddenly changes is determined based on the magnitude relation between the voltage value of the control terminal voltage after the reference time information Tref passes from the first voltage threshold Vref1 and the second voltage threshold Vref 2.

Specifically, in this possible design, referring to fig. 3C, the first input terminal of the first comparing unit Comp21 and the first input terminal of the second comparing unit Comp22 are both connected to the control terminal of the power switch Q1, the second input terminal of the first comparing unit Comp21 is used for accessing the first voltage threshold Vref1, the second input terminal of the second comparing unit Comp22 is used for accessing the second voltage threshold Vref2, the output terminal of the first comparing unit Comp21 is connected to the timing unit 21B, the timing unit 21B is also connected to the first input terminal of the third comparing unit Comp23, the second input terminal of the third comparing unit Comp23 is used for accessing the reference time information Tref, and the output terminal of the third comparing unit Comp23 is connected to the enable terminal of the second comparing unit Comp 22.

With continued reference to fig. 3C and 3D, the first comparing unit Comp21 outputs a timing signal when the voltage Vg1 of the control terminal of the power switch Q1 is less than or equal to the first voltage threshold Vref1, the timing unit 21B starts timing and outputs real-time timing information when receiving the timing signal, the third comparing unit Comp23 outputs an enable signal EN when the real-time timing information reaches the reference time information Tref, and the second comparing unit Comp22 compares the current control terminal voltage of the power switch Q1 with the second voltage threshold Vref2 when receiving the enable signal EN, and outputs a shutdown signal off when the current control terminal voltage Vg2 is less than or equal to the second voltage threshold Vref 2.

In this embodiment, as shown in fig. 3C and 3D, the first comparing unit Comp21 compares the control terminal voltage Vg of the power switch Q1 with the first voltage threshold Vref1, when the control terminal voltage Vg1 is less than or equal to the first voltage threshold Vref1, the first comparing unit determines that the control terminal voltage Vg 21 drops to be less than or equal to the first voltage threshold Vref1, and outputs a timing signal, so that the timing unit 21B starts timing and outputs real-time timing information, the third comparing unit Comp23 compares the real-time timing information with the first reference time Tref, and outputs an enable signal EN when the real-time timing information reaches the reference time information Tref, that is, when the real-time timing information is greater than or equal to the reference time information Tref, the second comparing unit Comp22 starts working, the second comparing unit Comp22 compares the collected control terminal voltage 2 with the second voltage threshold Vref2, and when it is determined that the control terminal voltage Vg2 of the power switch Q1 is less than or equal to the second voltage threshold Vref2, that the control terminal voltage Vg2 drops from the first voltage threshold Vref2 to the current voltage threshold Vref, that the control terminal voltage Vg2 is greater than or equal to the current threshold voltage Vref is determined that the control terminal voltage Vref is changed, and the slope of the second voltage Vref is greater than the current voltage Vref. When the second comparing unit Comp22 determines that the control terminal voltage of the power switch Q1 is greater than the second voltage threshold, it indicates that the current voltage value Vg2 when the control terminal voltage starts to count from falling to the first voltage threshold Vref1 and passes through the reference time information Tref is greater than the second voltage threshold Vref2, that is, the voltage variation is smaller, it considers that the slope of the curve of the control terminal voltage is smaller, the control terminal voltage does not generate a voltage jump, and the shutdown signal is not output.

It can be understood that in this embodiment, the principle of measuring whether the voltage of the control terminal is suddenly changed may be summarized as that the voltage Vg of the control terminal starts to time from decreasing to the first voltage threshold Vref1, and the current voltage Vg2 of the control terminal and the second voltage threshold Vref2 are related after the reference time information Tref, if the current voltage Vg2 of the control terminal is less than or equal to the second voltage threshold Vref2, the voltage of the control terminal is considered to be suddenly changed, and if the voltage of the current control terminal is greater than the second voltage threshold Vref2, the voltage of the control terminal is considered not to be suddenly changed.

It will be appreciated that in the embodiments shown in fig. 3A to 3D, the reference time information Tref, the current timing information, the real-time timing information, and the like may be represented by a duration, or may be represented by voltage information, a pulse number, and the like, for example, if the reference time information Tref is the reference voltage information, the real-time timing information is voltage variation information in the real-time timing duration, and if the reference time information Tref is the reference pulse number, the real-time timing information is pulse number variation in the real-time timing duration, and the like. In other embodiments, the reference time information Tref, the current timing information, the real-time timing information, and the like may also be represented in other manners, which is not limited in this embodiment.

In this embodiment, the voltage abrupt change detection circuit 21 can timely and accurately determine whether the control terminal voltage is abrupt according to the control terminal voltage of the power switch Q1, that is, determine whether the load 30 is shorted, if yes, output an off signal, so that the control circuit 22 timely turns off the power switch Q1 through the driving circuit 23, thereby protecting the power switch Q1 from being damaged, and having a fast response speed to the load short circuit.

Alternatively, on the basis of the above embodiments, the embodiments of the present application may also provide two possible implementations of the driving circuit, so that the driving circuit increases the turn-off speed of the power switch when receiving the turn-off control signal.

In one possible implementation, fig. 4A is a schematic diagram of a circuit module of a high-side intelligent electronic switch, a battery, a load, and the like according to a second embodiment of the present application. As shown in fig. 4A, in the high-side intelligent electronic switch 20, the driving circuit 23 includes a charging unit 23A, a charging switch M1, and a discharging switch M2.

The charging unit 23A is connected in series with the charging switch M1 to form a charging branch, one end of the charging branch is connected with the first power supply end, the other end of the charging branch is connected with the control end g of the power switch Q1, two ends of the discharging switch M2 are correspondingly connected with the control end and the second end of the power switch Q1, and the control end of the charging switch M1 and the control end of the discharging switch M2 are both connected with the control circuit 22.

In this embodiment, when the control circuit 22 outputs the off control signal, the charge switch M1 is turned off, and the discharge switch M2 is turned on to discharge the charge of the control terminal of the power switch Q1, so that the power switch Q1 is turned off.

Alternatively, the voltage of the first power supply terminal is higher than the voltage of the power supply terminal VBAT, and the first power supply terminal may be an output terminal of a boost circuit, for example, a Charge Pump (CP) circuit, and in fig. 2B, the first power supply terminal is identified by CP.

In this embodiment, by rebuilding the conventional driving control circuit, for example, only the discharging switch M2 is connected in the discharging branch between the control terminal of the power switch Q1 and the load output terminal OUT, so that when the control circuit 22 outputs the off control signal, the discharging switch M2 is turned on, and the charge of the control terminal of the power switch Q1 can be rapidly discharged through the discharging switch M2, so that the power switch Q1 is rapidly turned off, and the probability of damage of the power switch Q1 is reduced.

It can be understood that under normal conditions, when the control circuit 22 outputs the turn-off control signal, the charge switch M1 is turned off and the discharge switch M2 is turned on, the charge at the control end of the power switch Q1 is discharged through the discharge switch M2, so that the power switch Q1 is turned off, and when the control circuit 22 outputs the turn-on control signal, the charge switch M1 is turned on and the discharge switch M2 is turned off, at this time, the first power supply end can charge the parasitic capacitance of the power switch Q1 through the charge unit 23A and the charge switch 23A, so that the voltage at the control end is increased, and the power switch Q1 is turned on.

It can be appreciated that the present embodiment only describes one implementation manner of the driving circuit, and the driving circuit can be designed based on actual requirements, which is not described herein.

In another possible implementation, fig. 4B is another schematic circuit block diagram of a high-side intelligent electronic switch, a battery, a load, and the like according to a second embodiment of the present application. As shown in fig. 4B, in the high-side intelligent electronic switch 20, the driving circuit 23 includes a driving unit 231 and a switching unit 232.

The driving unit 231 and the switching unit 232 are both connected with the control circuit 22, the driving unit 231 and the switching unit 232 are both connected with the second end of the power switch Q1, the driving unit 231 is used for controlling the power switch Q1 to be turned on or turned off, and the switching unit 232 is used for discharging charges at the control end of the power switch Q1 when turned on.

In the present embodiment, the control circuit 22 controls the switch unit 232 to be turned on and turned off when receiving the turn-off signal to bleed the charge of the control terminal of the power switch Q1, so that the power switch Q1 is turned off and turned on.

Alternatively, in the present embodiment, the driving unit 231 may be a driving control circuit in a conventional sense, which is capable of controlling the switching state of the power switch Q1 upon receiving a driving control signal. As an example, referring to fig. 4B, the driving unit 231 includes a charging unit 2311, a charging switch M1, a discharging switch M2, and a discharging unit 2312 connected in series, wherein the charging unit 2311 and the charging switch M1 form a charging branch, the discharging switch M2 and the discharging unit 2312 form a discharging branch, one end of the charging branch is connected to a first power supply terminal, the other end thereof is connected to a control terminal of the power switch Q1, one end of the discharging branch is connected to a control terminal of the power switch Q1, the other end thereof is connected to a load output terminal OUT, and the switching states of the charging switch M1 and the discharging switch M2 are controlled by a driving control signal output from the control circuit 22, thereby enabling to control the switching state of the power switch Q1. Similar to fig. 4A, in fig. 4B, the first power supply terminal is also identified with a CP.

It will be appreciated that, under normal circumstances, when the voltage abrupt detecting circuit 21 does not output the turn-off signal, the control circuit 22 may output the drive control signal based on the received drive control signal or the protection signal, for example, when the control circuit 22 receives the protection signal, the control circuit outputs the turn-off control signal to the charge switch M1 and the discharge switch M2 of the driving unit 231, so that the charge switch M1 is turned off, the discharge switch M2 is turned on, and the charge at the control end of the power switch Q1 is discharged through the discharge branch formed by the discharge switch M2 and the discharge unit 2312, so that the power switch Q1 is turned off. That is, the discharging speed of the power switch Q1 can be controlled due to the presence of the discharging unit 2312 in the discharging circuit of the driving unit 231, but when the load is short-circuited, the speed of discharging the electric charge is limited in this way, which is disadvantageous in protecting the safety of the power switch Q1.

In this example, by providing the switching unit 232 between the control terminal of the power switch Q1 and the load output terminal OUT, the control circuit 22 can rapidly turn off the power switch Q1 via the switching unit 2312 of the driving circuit 22 when the voltage abrupt detecting circuit 21 detects that the load 30 is short-circuited to output the off signal. For example, when the control circuit 22 receives the turn-off signal, it will shield the received drive control signal and output the turn-off control signal, so that the switch unit 232 is turned on, and a discharge path is formed between the control terminal of the power switch Q1 and the ground, so that the charge at the control terminal of the power switch Q1 will be rapidly discharged to the ground through the switch unit 232, so that the voltage at the control terminal of the power switch Q1 is rapidly reduced to zero, and the turn-off speed of the power switch Q1 is increased.

Alternatively, the charging unit 2311 and the discharging unit 2312 may be any one of a constant current source, a depletion type switching transistor or a resistor, the charging unit 2311 is mainly used for providing a stable current to charge the parasitic capacitance of the power switch Q1 to control the power switch Q1 to be turned on and turned off, and the discharging unit 2312 is mainly used for controlling the discharging speed of the parasitic capacitance of the power switch Q1 to control the turning-off speed of the power switch Q1.

It will be appreciated that in the embodiment shown in fig. 4B, a logic not gate is further connected between the control circuit 22 and the control terminal of the charging switch M1, and the control circuit 22 and the control terminal of the discharging switch M2 are not connected with a logic not gate for illustration. The logic not gate may identify that the control signals output to the charge switch M1 and the discharge switch M2 are different, that is, when the control circuit 22 outputs the on control signal, the discharge switch M2 is turned off when the charge switch M1 is turned on, and when the control circuit 22 outputs the off control signal, the charge switch M1 is turned off when the discharge switch M2 is turned on. Of course, in other embodiments, a logic circuit may be connected between the control circuit 22 and the discharge switch M2, or no logic circuit may be connected between the control circuit 22 and the charge switch M1 and/or the discharge switch M2, which may be determined according to the types of the charge switch M1 and the discharge switch M2, which is not limited herein.

In practical applications, other circuit elements, such as a resistor, a zener diode (zener diode) or at least one switching tube (NMOS or PMOS), are connected between the gate g and the source s of the power switch Q1, when the power switch Q1 is operating normally, the charging unit 2311 may provide a stable current to the gate of the power switch Q1, so that the power switch Q1 operates in a linear region and is used as a switch, and when the voltage of the control terminal of the power switch Q1 is suddenly changed, the voltage suddenly changing detection circuit 21 outputs a turn-off signal, so that the control circuit 22 outputs a turn-off control signal, and further the switch unit 232 is turned on, so that the charge of the control terminal can be directly discharged through the switch unit 232, thereby improving the discharging speed of the charge and the turn-off speed of the power switch.

In this scheme, through setting up the switch unit between power switch's control end and load output, when control circuit output cut-off control signal, this cut-off control signal can make this switch unit open and switch on to can pull the voltage of low power switch's control end fast, in order to turn off power switch completely, can effectively avoid power switch overheated risk that leads to power switch to be burnt out like this.

Alternatively, in the present embodiment, the control circuit 22 is configured to control the switching state of the power switch Q1 via the driving circuit 23 based on the received signal, that is, the switching state of the power switch Q1 may be different depending on the signal received by the control circuit 22. The specific implementation of the control circuit 22 is explained below by way of two examples.

As an example, based on the above embodiments, fig. 5A is a schematic circuit diagram of a high-side intelligent electronic switch, a battery, a load, and the like according to a third embodiment of the present application. As shown in fig. 5A, the control circuit 22 includes a latch unit 221 and a logic control unit 222.

The first Input end of the latch unit 221 is connected to the output end of the voltage abrupt change detection circuit 21, the second Input end is used for accessing the driving control signal Input, the output end is connected to the logic control unit 222, and the driving control signal Input is an ON control signal ON or an OFF control signal OFF.

In this example, the latch unit 221 enters a locked state and continuously outputs an intermediate signal to make the logic control unit 222 continuously output the off control signal if the off control signal is received during the ON period when the ON control signal is received, and the latch unit 221 releases the locked state if the off control signal is received in the locked state.

Alternatively, when the power switch Q1 is in the ON state, that is, the latch unit 221 suddenly shorts the load 30 connected to the power switch Q1 during receiving the ON control signal ON, the latch unit 221 outputs an off signal after judging by the voltage jump detection circuit 21, so that the latch unit 221 enters a locked state and continuously outputs a first intermediate signal, which may include characteristic information of the off signal, so that the logic control unit 222 continuously outputs the off control signal, so that the driving circuit 23 controls the power switch Q1 to be turned off.

For example, when the driving control signal (Input signal) received by the latch unit 221 is changed, for example, when the Input signal is changed from the on control signal to the off control signal, the latch unit 221 may release the locked state, so that the latch unit 221 may output a second intermediate signal based on the received Input signal in a subsequent process, where the second intermediate signal includes characteristic information of the Input signal, and thus the logic control unit 222 outputs a corresponding control signal, thereby controlling the switching state of the power switch Q1. That is, the latch unit 221 is in the locked state continuously after entering the locked state based on the off signal output by the voltage abrupt change detection circuit 21, and is unlocked only when the external microprocessor outputs the driving control signal (Input signal), so that the unnecessary phenomenon of frequently turning on and off the power switch Q1 can be effectively avoided, and the safety of the power switch can be effectively protected.

It is understood that the logic control unit 222 may also receive a protection signal, in which case it may output a turn-off control signal and control the power switch Q1 to turn off via the driving circuit 23.

As another example, fig. 5B is another schematic circuit block diagram of a high-side intelligent electronic switch, a battery, a load, and the like according to a third embodiment of the present application. As shown in fig. 5B, the control circuit 22 includes a latch unit 221 and a logic control unit 222.

The first Input end of the latch unit 221 is connected to the output end of the voltage jump detecting circuit 21, the output end of the latch unit is connected to the logic control unit 222, and the logic control unit 222 is further configured to access the driving control signal Input signal. The latch unit 221 enters a lock state and continuously outputs a first intermediate signal when receiving the off signal, and the logic control unit 222 masks the driving control signal and outputs the off control signal when receiving the first intermediate signal.

Alternatively, the latch unit 221 is provided in the control circuit 22 so that the control circuit 22 can continuously output the off control signal. That is, the latch unit 221 may enter a locked state upon receiving the off signal, and continuously output the first intermediate signal in the locked state, so that the logic control unit 222 shields the received driving control signal and keeps outputting the off control signal until the power switch Q1 is completely turned off.

In the scheme, the latch unit included in the control circuit latches and outputs the turn-off signal output by the voltage mutation detection circuit, so that the power switch can be successfully turned off and turned off when the voltage of the control end of the power switch is suddenly changed due to load short circuit or other abnormality, and the risk of burning out the power switch is effectively reduced.

In fig. 5A and 5B, for example, the latch unit 221 may be implemented by an RS flip-flop, for example, an R terminal of the latch unit 221 is connected to the voltage jump detection circuit 21 or an Input signal is connected thereto, an S terminal of the latch unit 221 is connected to the voltage jump detection circuit 21, and an output terminal of the latch unit 221 is connected to the logic control unit 222.

Alternatively, on the basis of the embodiment shown in fig. 5B, fig. 6 is a schematic circuit diagram of a high-side intelligent electronic switch, a battery, a load, and the like according to a fourth embodiment of the present application. As shown in fig. 6, the high-side intelligent electronic switch 20 further includes a turn-off detection circuit 24, and the turn-off detection circuit 24 is connected to the second input terminal of the latch unit 221.

In the present embodiment, the off detection circuit 24 is configured to detect whether the power switch Q1 is completely turned off, output an unlock signal when it is determined that the power switch Q1 is completely turned off, and unlock the latch unit 221 upon receiving the unlock signal.

In practical applications, the turn-off detection circuit 24 can detect whether the power switch Q1 is completely turned off or not in various ways, for example, the turn-off detection circuit 24 can determine whether the power switch Q1 is completely turned off or not by detecting the gate-source voltage or the output current of the power switch Q1 or the duration of the turn-off signal or the duration of the turn-off control signal, or the like.

As an example, in the high-side intelligent electronic switch 20, the turn-off detection circuit 24 is implemented by a voltage detection circuit (not shown). For example, two terminals of a voltage detection circuit may be correspondingly connected to the control terminal of the power switch Q1 and the second terminal of the power switch Q1, and an output terminal thereof is connected to the second input terminal of the latch unit 221, and the voltage detection circuit is configured to detect a gate-source voltage signal of the power switch Q1 and output an unlock signal when the gate-source voltage signal is equal to zero, so as to unlock the latch unit 221.

In practical applications, the voltage detection circuit is actually a gate-source voltage detection circuit of the power switch Q1, and two ends of the voltage detection circuit are correspondingly connected with a control end (gate) and a source of the power switch Q1, so that the gate voltage and the source voltage of the power switch Q1 can be respectively obtained, and a gate-source voltage signal of the power switch Q1 can be obtained based on the gate voltage and the source voltage. Since the gate-source voltage signal of the power switch Q1 is less than or equal to the preset voltage threshold, for example, equal to 0, when the power switch Q1 is in the off-state, the voltage detection circuit may detect the gate-source voltage signal of the power switch Q1 in real time, and if the gate-source voltage signal is detected to be less than or equal to the preset voltage threshold, for example, vgs=0, the power switch Q1 is considered to be successfully turned off, and then it may output an unlock signal to release the locked state of the latch unit 221, so that the off signal latched in the latch unit 221 may be cleared, so that the latch unit 221 may no longer continuously output the off signal.

Alternatively, when the latch unit 221 does not output the off signal, the logic control unit 222 may control the driving circuit 23 based on the received driving control signal, so that the driving circuit 23 controls the switching state of the power switch Q1 based on the driving control signal.

Alternatively, as another example, in the high-side intelligent electronic switch 20, the turn-off detection circuit 24 may be implemented by a current detection circuit (not shown). The input end of the current detection circuit may be connected to the branch where the power switch Q1 is located or to the power switch Q1, and the output end thereof may be connected to the latch unit 221, where the current detection circuit may detect the output current of the power switch Q1, and when the output current of the power switch Q1 is equal to 0, it is considered that the power switch Q1 is successfully turned off at this time, an unlock signal may be output to release the locked state of the latch unit 221, so that the latch unit 221 no longer continuously outputs the turn-off signal. Thus, after the latch unit 221 is unlocked, the control circuit 22 may control the driving circuit 23 based on the received driving control signal, so that the driving circuit 23 controls the switching state of the power switch Q1 based on the driving control signal. In the present embodiment, by adding the current detection circuit to detect the output current of the power switch Q1, the off signal of the latch unit 221 is cleared when the output current of the power switch Q1 is equal to zero, so that the control circuit 22 can control the operation state of the driving circuit 23 based on the received driving control signal.

In the embodiment of the application, when the voltage abrupt change detection circuit 21 outputs the turn-off signal and needs to turn off the power switch, the latch unit arranged in the control circuit 22 can latch the turn-off signal, so that the control circuit shields the drive control signal and continuously outputs the turn-off control signal, and when the power switch is completely turned off, the latch unit can be automatically unlocked, the shielding of the drive control signal is released, the high-side intelligent electronic switch can be normally opened, the locking can be automatically released under the condition that the short circuit can be in vertical contact, the intellectualization of the high-side intelligent electronic switch is improved, and the user experience is improved.

Optionally, in this embodiment, in order to further ensure that the power switch Q1 can work normally when turned on again, as shown in fig. 6, a delay circuit 25 may be further added to the high-side intelligent electronic switch 20, and the delay circuit 25 may be connected between the off detection circuit 24 and the latch unit 221.

Illustratively, the input end of the delay circuit 25 is connected to the output end of the off detection circuit 24, the output end of the delay circuit 25 is connected to the second input end of the latch unit 221, the delay circuit 25 is configured to start timing when receiving the unlock signal, and when the continuous timing information reaches the preset time information, the delay circuit 25 outputs the delayed unlock signal, and the latch unit 221 releases the locked state when receiving the delayed unlock signal.

In this embodiment, the delay circuit is disposed between the turn-off detection circuit and the latch unit, that is, after the turn-off detection circuit outputs the unlock signal, the unlock signal needs to be delayed by the delay circuit, for example, the unlock signal can be output to the latch unit after being delayed by the preset time information, so that the latch unit is unlocked after the power switch is completely turned off by the preset time information, thus effectively reducing the overheat risk when the power switch is turned on again, and ensuring the use safety of the power switch.

It will be understood that other parts not described in the above embodiments may be referred to in other embodiments of the present application, and are not described herein.

Optionally, on the basis of the above embodiments, the embodiment of the present application further provides an integrated circuit chip, where the integrated circuit chip includes the high-side intelligent electronic switch 20 in the above embodiments, that is, the high-side intelligent electronic switch 20 may be formed on the same semiconductor substrate. The power supply end VBAT is a power supply pin, the power ground end GND is a power ground pin, and the load output end OUT is a load output pin.

Alternatively, other embodiments of the present application also provide a chip product, which may include the above-mentioned high-side intelligent electronic switch 20, where the components (for example, the voltage jump detection circuit, the control circuit, the driving circuit, etc.) of the high-side intelligent electronic switch 20 other than the power switch Q1 are located on a first integrated circuit chip, and the power switch Q1 is located on a second integrated circuit chip, that is, the first integrated circuit chip is formed on one semiconductor substrate, and the second integrated circuit chip is formed on another semiconductor substrate.

The power supply end VBAT is a power supply pin, the power ground end GND is a power ground pin, the load output end OUT is a load output pin, the power supply pin VBAT and the power ground pin GND are positioned on the first integrated circuit chip, and the load output pin is positioned on the second integrated circuit chip. In addition, the first integrated circuit chip further includes other pins, for example, a first driving pin, and the second integrated circuit chip further includes other pins, for example, a second driving pin, where the first driving pin is connected to the driving circuit and the second driving pin, respectively, and the second driving pin is connected to the control terminal of the power switch Q1. It can be understood that the first integrated circuit chip and the second integrated circuit chip can be additionally provided with other pins, related pins can be omitted, or related pins can be combined according to requirements. Here, the first integrated circuit chip and the second integrated circuit chip are packaged into one product.

In addition, in other embodiments of the present application, an automobile is provided, which may be an electric automobile, such as an electric passenger car or an electric business car, or may be a hybrid car or a fuel oil car, and the automobile includes a battery 10, a load 30, a microprocessor (not shown), and a high-side intelligent electronic switch 20.

The battery 10 is typically a storage battery, and the storage battery provides voltages of 12V, 24V, 48V, etc., but other types of batteries are also possible. The load 30 comprises at least one of a resistive load, such as a seat adjustment device, an auxiliary heating device, a window heating device, a Light Emitting Diode (LED), a rear lighting or other resistive load, an inductive load, such as a pump, actuator, motor, anti-lock brake system (ABS), electronic Brake System (EBS), fan or other system comprising an inductive load, for example a lighting element, such as a xenon arc lamp, for one or more wiper systems.

The microcontroller is connected with the high-side intelligent electronic switch and is used for controlling the high-side intelligent electronic switch, and meanwhile, the high-side intelligent electronic switch feeds back the state and related parameter information, such as diagnostic related parameter information, to the microprocessor for processing by the microprocessor.

It can be appreciated that the high-side intelligent electronic switch and the integrated circuit chip of the embodiment are not limited to be used in automotive electronics, but also can be used in the fields of industrial automation, aerospace and the like, and will not be described herein.

Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It is to be understood that the application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims

1. A high-side intelligent electronic switch, characterized in that it includes a power supply terminal, a power ground terminal, a load output terminal, a power switch, a voltage mutation detection circuit, a control circuit and a drive circuit;

Wherein, the power supply terminal and the power ground terminal are used to be connected to a battery, and the load output terminal is used to be connected to a load;

The power switch is used to be connected in series with the load, with a first end connected to the power supply end, a second end connected to the load output end, and a control end connected to the drive circuit, and the drive circuit is used to control the power switch to turn on or off;

The voltage mutation detection circuit has a first end connected to the control end of the power switch, a second end connected to the power ground end, and an output end connected to the control circuit, the control circuit is further connected to the drive circuit, and the drive circuit is further connected to the second end of the power switch;

The voltage mutation detection circuit outputs a shutdown signal when a sudden change occurs in the control terminal voltage of the power switch, and the control circuit outputs a cutoff control signal based on the received shutdown signal so that the drive circuit controls the power switch to be turned off; wherein the control terminal voltage is equal to the sum of the gate-source voltage and the source voltage of the power switch.

2. The high-side intelligent electronic switch according to claim 1 is characterized in that the voltage mutation detection circuit is used to obtain the control terminal voltage of the power switch when working, and judge whether the control terminal voltage has a mutation according to the voltage change information of the control terminal of the power switch relative to the power ground terminal.

3. The high-side intelligent electronic switch according to claim 2, characterized in that the voltage mutation detection circuit comprises a first enable terminal and a second enable terminal, the first enable terminal is used to access a drive control signal, the drive control signal is a turn-on control signal or a turn-off control signal, the second enable terminal is used to access a protection signal or a non-protection signal, and the control circuit is also used to access one of the protection signal and the non-protection signal and the drive control signal;

The voltage mutation detection circuit does not work when it receives a shutdown control signal and/or a protection signal, and works when it receives a start control signal and a non-protection signal at the same time; the control circuit is also used to control the power switch to be shut down via the drive circuit when it receives a shutdown control signal and/or a protection signal.

4. The high-side intelligent electronic switch according to claim 2, characterized in that the voltage mutation detection circuit comprises an enable terminal, and the enable terminal is used to access a protection signal or a non-protection signal;

The voltage mutation detection circuit does not work when it receives a protection signal, and works when it receives a non-protection signal.

5. The high-side intelligent electronic switch according to any one of claims 2 to 4, characterized in that the voltage change information includes the size relationship between the time information required for the control terminal voltage to drop from the first voltage threshold to the second voltage threshold and the reference time information, and the second voltage threshold is less than the first voltage threshold and the second voltage threshold is greater than the maximum voltage value of the control terminal relative to the load output terminal when the power switch is normally turned on;

The voltage mutation detection circuit includes a first comparison unit, a second comparison unit, a timing unit and a third comparison unit; the first input end of the first comparison unit and the first input end of the second comparison unit are both connected to the control end of the power switch, the second input end of the first comparison unit is used to access the first voltage threshold, the second input end of the second comparison unit is used to access the second voltage threshold, the output end of the first comparison unit is connected to the timing unit, the output end of the second comparison unit is connected to the enable end of the third comparison unit, the timing unit is also connected to the first input end of the third comparison unit, and the second input end of the third comparison unit is used to access reference time information;

The first comparison unit outputs a timing signal when the voltage at the control terminal of the power switch is less than or equal to a first voltage threshold, the timing unit starts timing and outputs real-time timing information when receiving the timing signal, the second comparison unit outputs an enable signal when the voltage at the control terminal of the power switch is less than or equal to a second voltage threshold, the third comparison unit compares the current timing information of the timing unit with the reference time information when receiving the enable signal, and outputs the shutdown signal when the current timing information is less than or equal to the reference time information.

6. The high-side intelligent electronic switch according to any one of claims 2 to 4, characterized in that the voltage change information comprises a magnitude relationship between the control terminal voltage and the second voltage threshold when the reference time information is passed from a first moment, the first moment is the moment when the control terminal voltage drops to the first voltage threshold, the second voltage threshold is less than the first voltage threshold and the second voltage threshold is greater than the voltage value of the control terminal relative to the load output terminal when the power switch is normally turned on;

The voltage mutation detection circuit includes a first comparison unit, a timing unit, a second comparison unit and a third comparison unit; the first input end of the first comparison unit and the first input end of the second comparison unit are both connected to the control end of the power switch, the second input end of the first comparison unit is used to access the first voltage threshold, the second input end of the second comparison unit is used to access the second voltage threshold, the output end of the first comparison unit is connected to the timing unit, the timing unit is also connected to the first input end of the third comparison unit, the second input end of the third comparison unit is used to access the reference time information, and the output end of the third comparison unit is connected to the enable end of the second comparison unit;

The first comparison unit outputs a timing signal when the voltage at the control terminal of the power switch is less than or equal to a first voltage threshold, the timing unit starts timing and outputs real-time timing information when receiving the timing signal, the third comparison unit outputs an enable signal when the real-time timing information reaches the reference time information, the second comparison unit compares the current control terminal voltage of the power switch with the second voltage threshold when receiving the enable signal, and outputs the shutdown signal when the current control terminal voltage is less than or equal to the second voltage threshold.

7. The high-side intelligent electronic switch according to any one of claims 1 to 4, characterized in that the driving circuit comprises a charging unit, a charging switch and a discharging switch;

The charging unit and the charging switch are connected in series to form a charging branch, one end of the charging branch is connected to the first power supply end, the other end of the charging branch is connected to the control end of the power switch, the two ends of the discharge switch are connected to the control end and the second end of the power switch respectively, and the control end of the charging switch and the control end of the discharge switch are both connected to the control circuit;

When the control circuit outputs the cutoff control signal, the charging switch is turned off, and the discharging switch is turned on to discharge the charge at the control end of the power switch, so that the power switch is turned off.

8. The high-side intelligent electronic switch according to any one of claims 1 to 4, characterized in that the driving circuit comprises a driving unit and a switch unit;

The driving unit and the switch unit are both connected to the control circuit, and are also both connected to the second end of the power switch. The driving unit is used to control the power switch to turn on or off, and the switch unit is used to discharge the charge of the control end of the power switch when it is turned on.

The control circuit controls the switch unit to turn on and conduct when receiving the shutdown signal, so as to quickly discharge the charge at the control end of the power switch, so that the power switch is turned off.

9. The high-side intelligent electronic switch according to any one of claims 1 to 4, characterized in that the control circuit comprises a latch unit and a logic control unit;

The latch unit has a first input end connected to the output end of the voltage mutation detection circuit, a second input end for receiving a drive control signal, and an output end connected to the logic control unit, wherein the drive control signal is a start control signal or a shutdown control signal;

If the latch unit receives the shutdown signal while receiving the opening control signal, it enters a locked state and continuously outputs the first intermediate signal so that the logic control unit continuously outputs the cutoff control signal; if the latch unit receives the shutdown control signal in the locked state, the locked state is released.

10. The high-side intelligent electronic switch according to any one of claims 1 to 4, characterized in that the control circuit comprises a latch unit and a logic control unit;

The latch unit has a first input end connected to the output end of the voltage mutation detection circuit, and an output end connected to the logic control unit, and the logic control unit is also used to access the drive control signal;

The latch unit enters a locking state and continuously outputs a first intermediate signal upon receiving the shutdown signal, and the logic control unit shields the driving control signal and outputs the cutoff control signal upon receiving the first intermediate signal.

11. The high-side intelligent electronic switch according to claim 10, characterized in that the high-side intelligent electronic switch further comprises a shutdown detection circuit, and the shutdown detection circuit is connected to the second input terminal of the latch unit;

The shutdown detection circuit is used to detect whether the power switch is completely shut down, and output an unlock signal when it is determined that the power switch is completely shut down. The latch unit releases the locking state when receiving the unlock signal.

12. The high-side intelligent electronic switch according to claim 11, characterized in that the high-side intelligent electronic switch further comprises a delay circuit;

The delay circuit has an input end connected to the output end of the shutdown detection circuit, and an output end connected to the second input end of the latch unit. The delay circuit starts timing when receiving the unlocking signal and when the continuous timing information reaches the preset time information, the delay circuit outputs the delayed unlocking signal. The latch unit releases the locked state when receiving the delayed unlocking signal.

13. An integrated circuit chip, characterized in that it comprises the high-side intelligent electronic switch according to any one of claims 1 to 12, wherein the power supply end is a power supply pin, the power ground end is a power ground pin, and the load output end is a load output pin.

14. A chip product, comprising the high-side intelligent electronic switch according to any one of claims 1 to 12, wherein the components of the high-side intelligent electronic switch except the power switch are located on a first integrated circuit chip, and the power switch is located on a second integrated circuit chip;

Among them, the power supply end is a power supply pin, the power ground end is a power ground pin, and the load output end is a load output pin. The power supply pin and the power ground pin are located on a first integrated circuit chip, and the load output pin is located on a second integrated circuit chip.

15. An automobile, characterized by comprising the high-side intelligent electronic switch according to any one of claims 1 to 12, or the integrated circuit chip according to claim 13, or the chip product according to claim 14;

It also includes a battery, a load and a microprocessor, wherein the positive electrode of the battery is connected to the power supply terminal, the negative electrode of the battery is connected to the power ground terminal, one end of the load is connected to the load output terminal, the other end of the load is connected to the power ground terminal or the power supply terminal, and the microprocessor is connected to the high-side intelligent electronic switch.

16 . The automobile according to claim 15 , wherein the automobile is an electric automobile, a hybrid automobile or a fuel automobile, and the load comprises at least one of a resistive load, an inductive load and a capacitive load.