CN114337263B

CN114337263B - Electric vehicle and control power supply circuit thereof

Info

Publication number: CN114337263B
Application number: CN202210158450.8A
Authority: CN
Inventors: 罗文辉
Original assignee: Xiaomi Automobile Technology Co Ltd
Current assignee: Xiaomi Automobile Technology Co Ltd
Priority date: 2022-02-21
Filing date: 2022-02-21
Publication date: 2022-12-02
Anticipated expiration: 2042-02-21
Also published as: CN114337263A

Abstract

The application provides an electric vehicle and a control power supply circuit thereof, and belongs to the technical field of electronics. The control power supply circuit is applied to an electric vehicle including a low-voltage-side load and a high-voltage-side load. The control circuit in the control power supply circuit can control the first control power supply circuit to supply power to the low-voltage side load based on the power supply voltage provided by the low-voltage battery and control the second control power supply circuit to supply power to the high-voltage side load based on the power supply voltage provided by the high-voltage battery when the power supply voltage provided by the low-voltage battery is within a voltage range, namely the low-voltage battery does not have a fault. And the control circuit can control the first control power supply circuit and the second control power supply circuit to respectively supply power to the low-voltage side load and the high-voltage side load based on the power supply voltage provided by the high-voltage battery when the power supply voltage provided by the low-voltage battery is out of the voltage range, namely the low-voltage battery fails. Therefore, the low-voltage side load and the high-voltage side load can be still normally driven to work when the low-voltage battery fails.

Description

Electric vehicle and control power supply circuit thereof

Technical Field

The present application relates to the field of electronic technologies, and in particular, to an electric vehicle and a control power supply circuit thereof.

Background

The electric vehicle is a new energy automobile which runs by depending on the electric quantity provided by a battery and the driving force provided by a motor, and has the advantages of energy conservation, low noise, zero emission and the like.

In the related art, an electric vehicle generally includes: the low-voltage side load, the high-voltage side load, and the control power supply circuit for driving the low-voltage side load and the high-voltage side load to work. Wherein, control power supply circuit includes: the low-voltage battery, the low-voltage side isolation control power supply circuit and the high-voltage side isolation control power supply circuit. The low-voltage battery is connected with the low-voltage side isolation control power supply, the low-voltage side isolation control power supply is respectively connected with the low-voltage side load and the high-voltage side isolation control power supply, and the high-voltage side isolation control power supply is connected with the high-voltage side load. The low-voltage side isolation control power supply can supply power to the low-voltage side load under the driving of the low-voltage battery so as to drive the low-voltage side load to work, and can supply power supply voltage to the high-voltage side isolation control power supply. The high-voltage side isolation control power supply can supply power to the high-voltage side load based on the power supply voltage provided by the low-voltage side isolation control power supply so as to drive the high-voltage side load to work. The low-voltage side isolation control power circuit and the high-voltage side isolation control power circuit are generally transformers.

However, in the related art, the reliability of controlling the power supply circuit to supply power to the low-voltage side load and the high-voltage side load is low, and there is a problem that the low-voltage side load and the high-voltage side load cannot be normally driven to operate due to a fault of the low-voltage battery.

Disclosure of Invention

The embodiment of the application provides an electric vehicle and a control power supply circuit thereof, and can solve the problem that the reliability of power supply to a low-voltage side load and a high-voltage side load by the control power supply circuit in the related art is low. The technical scheme is as follows:

in one aspect, a control power supply circuit is provided for use in an electric vehicle including a low-side load and a high-side load; the control power supply circuit includes: the control circuit comprises a low-voltage battery, a high-voltage battery, a first control power supply circuit, a second control power supply circuit and a control circuit;

the low-voltage battery is connected with the first control power supply circuit and is used for providing a first power supply voltage for the first control power supply circuit;

the high-voltage battery is connected with the second control power supply circuit and is used for providing a second power supply voltage to the second control power supply circuit, and the second power supply voltage is higher than the first power supply voltage;

the first control power supply circuit is also connected with the second control power supply circuit, the first control power supply circuit is also used for being connected with the low-voltage side load, and the second control power supply circuit is also used for being connected with the high-voltage side load;

the control circuit is respectively connected with the low-voltage battery, the first control power supply circuit and the second control power supply circuit.

Optionally, the control circuit is configured to:

if the first power supply voltage is determined to be within a first voltage range, controlling the first control power supply circuit to supply power to the low-voltage side load based on the first power supply voltage, and controlling the second control power supply circuit to supply power to the high-voltage side load based on the second power supply voltage;

and if the first power supply voltage is determined to be out of the first voltage range, controlling the second control power supply circuit to provide the second power supply voltage for the first control power supply circuit, so that the first control power supply circuit supplies power to the low-voltage side load based on the second power supply voltage, and controlling the second control power supply circuit to supply power to the high-voltage side load based on the second power supply voltage.

Optionally, the control circuit includes a control sub-circuit and a switch sub-circuit; the first control power supply circuit and the second control power supply circuit are respectively provided with an input end, a first output end and a second output end;

the input end of the first control power supply circuit is connected with the low-voltage battery, the first output end of the first control power supply circuit is used for connecting the low-voltage side load, and the second output end of the first control power supply circuit is connected with the second output end of the second control power supply circuit;

the input end of the second control power supply circuit is connected with the high-voltage battery, the first output end of the second control power supply circuit is connected with the input end of the switch sub-circuit, the output end of the switch sub-circuit is connected with the input end of the first control power supply circuit, and the second output end of the second control power supply circuit is also used for being connected with the high-voltage side load;

the control sub-circuit is respectively connected with the low-voltage battery, the control end of the switch sub-circuit, the input end of the first control power supply circuit and the input end of the second control power supply circuit.

Optionally, the control sub-circuit is configured to:

if the first power supply voltage is determined to be within the first voltage range, controlling the input end of the switch sub-circuit to be disconnected with the output end, controlling the input end of the first control power supply circuit to receive the first power supply voltage, and controlling the input end of the second control power supply circuit to receive the second power supply voltage;

and if the first power supply voltage is determined to be out of the first voltage range, controlling the input end and the output end of the switch sub-circuit to be conducted, and controlling the input end of the second control power supply circuit to receive the second power supply voltage.

Optionally, the switch sub-circuit includes: a switching transistor;

the grid electrode of the switch transistor is connected with the control sub-circuit, the first pole of the switch transistor is connected with the first output end of the second control power supply circuit, and the second pole of the switch transistor is connected with the input end of the first control power supply circuit.

Optionally, the control sub-circuit is further connected to the high-voltage battery; the control sub-circuit is to:

if the first power supply voltage is determined to be within the first voltage range and the second power supply voltage is determined to be within the second voltage range, controlling the input end of the switch sub-circuit to be disconnected from the output end, controlling the input end of the first control power supply circuit to receive the first power supply voltage, and controlling the input end of the second control power supply circuit to receive the second power supply voltage, wherein the lower limit of the second voltage range is higher than the upper limit of the first voltage range;

if the first power supply voltage is determined to be out of the first voltage range and the second power supply voltage is determined to be within the second voltage range, controlling the input end and the output end of the switch sub-circuit to be conducted and controlling the input end of the second control power supply circuit to receive the second power supply voltage;

and if the first power supply voltage is determined to be in the first voltage range and the second power supply voltage is determined to be out of the second voltage range, controlling the input end of the switch sub-circuit to be disconnected with the output end, controlling the input end of the first control power supply circuit to receive the first power supply voltage, and controlling the input end of the second control power supply circuit to stop receiving the second power supply voltage.

Optionally, the control sub-circuit includes: the device comprises a first detection unit, a second detection unit, a control unit and a logic processing unit;

the first detection unit is respectively connected with the low-voltage battery and the control unit, and is used for collecting the first power supply voltage, providing a first driving signal to the control unit when detecting that the first power supply voltage is within the first voltage range, and providing a second driving signal to the control unit when detecting that the first power supply voltage is outside the first voltage range;

the second detection unit is respectively connected with the high-voltage battery and the logic processing unit, and is used for acquiring the second power supply voltage, providing a third driving signal to the logic processing unit when detecting that the second power supply voltage is within the second voltage range, and providing a fourth driving signal to the logic processing unit when detecting that the second power supply voltage is outside the second voltage range;

the control unit is further connected with the control end of the switch sub-circuit, the input end of the first control power supply circuit and the logic processing unit respectively, and the control unit is used for controlling the input end of the switch sub-circuit to be disconnected with the output end based on the first driving signal, providing an enabling signal for the input end of the first control power supply circuit so as to control the input end of the first control power supply circuit to receive the first power supply voltage and provide a fifth driving signal for the logic processing unit; based on the second driving signal, controlling the input end and the output end of the switch sub-circuit to be conducted, providing an enabling signal for the input end of the first control power supply circuit, so as to control the input end of the first control power supply circuit to receive the second power supply voltage, and providing a sixth driving signal for the logic processing unit;

the logic processing unit is further connected to the input terminal of the second control power supply circuit, and is configured to provide an enable signal to the input terminal of the second control power supply circuit based on the third driving signal and the fifth driving signal to control the input terminal of the second control power supply circuit to receive the second power supply voltage, provide a disable signal to the input terminal of the second control power supply circuit based on the fourth driving signal and the fifth driving signal to control the input terminal of the second control power supply circuit to stop receiving the second power supply voltage, and provide an enable signal to the input terminal of the second control power supply circuit based on the third driving signal and the sixth driving signal to control the input terminal of the second control power supply circuit to receive the second power supply voltage.

Optionally, the first detecting unit includes: a first voltage sampling resistor and a first voltage comparator;

one end of the first voltage sampling resistor is connected with the low-voltage battery, the other end of the first voltage sampling resistor is connected with a first input end of the first voltage comparator, a second input end of the first voltage comparator is connected with a first reference power supply end, and an output end of the first voltage comparator is connected with the control unit;

wherein a voltage of a first reference power supply signal provided by the first reference power supply terminal is within the first voltage range.

Optionally, the second detecting unit includes: a second voltage sampling resistor and a second voltage comparator;

one end of the second voltage sampling resistor is connected with the high-voltage battery, the other end of the second voltage sampling resistor is connected with a first input end of the second voltage comparator, a second input end of the second voltage comparator is connected with a second reference power supply end, and an output end of the second voltage comparator is connected with the logic processing unit;

wherein a voltage of a second reference power supply signal provided by the second reference power supply terminal is within the second voltage range.

Optionally, the control unit is a micro control unit MCU.

Optionally, the logic processing unit is an and gate;

the first input end of the AND gate is connected with the control unit, the second input end of the AND gate is connected with the second detection unit, and the output end of the AND gate is connected with the input end of the second control power supply circuit.

Optionally, the control sub-circuit further includes: an isolation unit;

the control unit is connected with the logic processing unit through the isolation unit, and the isolation unit is used for realizing electrical isolation between the control unit and the logic processing unit.

Optionally, the isolation unit is: a digital isolator.

Optionally, the first control power supply circuit and the second control power supply circuit each include: an isolation control power supply, and a linear control power supply and/or a non-isolation control power supply;

the output end of an isolation control power supply in the first control power supply circuit is connected with the input end of an isolation control power supply in the second control power supply circuit; in the first control power supply circuit, other control power supplies except the isolation control power supply are connected with the input end of the isolation control power supply;

in the second control power supply circuit, other control power supplies except the isolation control power supply are connected with the output end of the isolation control power supply.

In another aspect, an electric vehicle is provided, including: a low-side load, a high-side load, and a control power supply circuit as described in the above aspect;

the control power supply circuit is respectively connected with the low-voltage side load and the high-voltage side load and is used for supplying power to the low-voltage side load and the high-voltage side load.

To sum up, the technical solution provided by the embodiment of the present application has at least the following beneficial effects:

an electric vehicle and a control power supply circuit thereof are provided, the control power supply circuit being applied to an electric vehicle including a low-voltage side load and a high-voltage side load, and the control power supply circuit including a low-voltage battery, a high-voltage battery, a first control power supply circuit, a second control power supply circuit, and a control circuit. The control circuit can control the first control power supply circuit to supply power to the low-voltage side load based on the first power supply voltage when the first power supply voltage provided by the low-voltage battery is within a voltage range, namely the low-voltage battery does not have a fault, and control the second control power supply circuit to supply power to the high-voltage side load based on the second power supply voltage provided by the high-voltage battery. And the control circuit can control the first control power supply circuit and the second control power supply circuit to respectively supply power to the low-voltage side load and the high-voltage side load based on the second power supply voltage provided by the high-voltage battery when the first power supply voltage provided by the low-voltage battery is out of the voltage range, namely the low-voltage battery fails. Therefore, the low-voltage side load and the high-voltage side load can be still normally driven to work when the low-voltage battery fails. The control power supply circuit has good reliability in supplying power to the low-voltage side load and the high-voltage side load.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to be able to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a control power supply circuit according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of another control power supply circuit provided in an embodiment of the present application;

FIG. 3 is a schematic structural diagram of another control power supply circuit provided in an embodiment of the present application;

fig. 4 is a schematic structural diagram of another control power supply circuit provided in an embodiment of the present application;

FIG. 5 is a schematic structural diagram of another control power supply circuit provided in an embodiment of the present application;

FIG. 6 is a schematic structural diagram of a further control power supply circuit according to an embodiment of the present disclosure;

fig. 7 is a schematic diagram illustrating an operating principle of a control power circuit according to an embodiment of the present application;

FIG. 8 is a schematic diagram illustrating an operation of another control power circuit according to an embodiment of the present disclosure;

FIG. 9 is a schematic diagram illustrating an operating principle of another control power circuit according to an embodiment of the present disclosure;

fig. 10 is a schematic structural diagram of an electric vehicle according to an embodiment of the present application.

The various reference numbers in the drawings are illustrated below:

00-control power supply circuit, 10-electric vehicle;

01-low voltage battery, 02-high voltage battery, 03-first control power supply circuit, 04-second control power supply circuit, 05-control circuit, 10-low voltage side load and 20-high voltage side load;

051-control sub-circuit, 052-switch sub-circuit;

0511-first detecting unit, 0512-second detecting unit, 0513-control unit, 0514-logic processing unit, 0515-isolation unit;

k1-switching transistor, R1-first sampling resistor, R2-second sampling resistor, VC 1-first voltage comparator and VC 2-second voltage comparator.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In the current electric vehicle, both the high-side load and the low-side load in the high-voltage system are supplied with power from the low-voltage battery. Namely, the voltage sources required by the low-voltage side load and the high-voltage side load are the power supply voltages provided by the low-voltage battery. This power supply mode, the existence is because of the low voltage battery breaks down, and leads to the problem that low pressure side load and high pressure side load all fall the electricity, and then still can cause a series of problems such as the device damage that low pressure side load and high pressure side load are uncontrollable, load function is invalid, load include or high-pressure safety, and power supply reliability and security are lower. Among these, low-voltage battery failures generally include: a lost connection (e.g., a broken connection), an overvoltage (i.e., too high a voltage), an undervoltage (i.e., too low a voltage), and/or a short circuit.

The embodiment of the application provides a control power supply circuit, which comprises a high-voltage battery and a control circuit besides a low-voltage battery. The control circuit can reliably detect whether the low-voltage battery fails or not, and can control the high-voltage battery to supply power to the low-voltage side load and the high-voltage side load when the low-voltage battery fails, so that the problem that the high-voltage side load and the low-voltage side load are powered down due to the failure of the low-voltage battery is solved, and the power supply reliability and the safety are high.

Alternatively, the high pressure system generally comprises: a motor controller, i.e., an Inverter (Inverter); an On Board Charger (OBC); a Direct Current (DC-DC) converter; a control Power Distribution Unit (PDU); a Battery energy Management System (BMS); an air conditioning compressor; parts such as cabin heater and battery heater or all-in-one product containing one of the above parts. And, the high-voltage side load and the low-voltage side load in the high-voltage system refer to control end loads having a control function, such as an operational amplifier, a logic chip, and a driving power supply circuit, which are included in the high-voltage system. The high-side load and the low-side load refer to loads connected to different ground terminals.

Fig. 1 is a schematic structural diagram of a control power supply circuit provided in an embodiment of the present application, where the control power supply circuit is applied to an electric vehicle. As shown in fig. 1, the electric vehicle includes a low-voltage side load 10 and a high-voltage side load 20, and the control power supply circuit includes: the device comprises a low-voltage battery 01, a high-voltage battery 02, a first control power supply circuit 03, a second control power supply circuit 04 and a control circuit 05.

The low-voltage battery 01 is connected to the first control power supply circuit 03, and the low-voltage battery 01 is configured to provide a first supply voltage to the first control power supply circuit 03.

The high-voltage battery 02 is connected to the second control power supply circuit 04, and the high-voltage battery 02 is configured to supply a second supply voltage to the second control power supply circuit 04.

The first control power supply circuit 03 is further connected to the second control power supply circuit 04, the first control power supply circuit 03 is further configured to be connected to a low-voltage side load 10, and the second control power supply circuit 04 is further configured to be connected to a high-voltage side load 20.

As can be seen from the above connection manner, referring to fig. 1, the low-voltage battery 01, the first control power supply circuit 03, and the low-voltage side load 10 may be divided into low-voltage sides, and accordingly, the first control power supply circuit 03 may also be referred to as a low-voltage side control power supply circuit. The high-voltage battery 02, the second control power supply circuit 03, and the high-voltage side load 20 may be divided into a high-voltage side, and accordingly, the second control power supply circuit 04 may also be referred to as a high-voltage side control power supply circuit. The second power supply voltage supplied from the second control power supply circuit 04 connected to the high-voltage side load 20 is higher than the first power supply voltage supplied from the first control power supply circuit 03 connected to the low-voltage side load 10. For example, in general, the first power supply voltage may be about ten and several volts (V), and the second power supply voltage may be about ten and several volts (V), which is slightly higher than the first power supply voltage, and is about 0.7V.

As can be seen with continued reference to fig. 1, the control circuit 05 is connected to the low-voltage battery 01, the first control power supply circuit 03, and the second control power supply circuit 04, respectively. The control circuit 05 is configured to control the first control power supply circuit 03 to supply power to the low-voltage-side load 10 based on the first power supply voltage and control the second control power supply circuit 04 to supply power to the high-voltage-side load 20 based on the second power supply voltage if it is determined that the first power supply voltage is within the first voltage range; and if it is determined that the first power supply voltage is outside the first voltage range, controlling the second control power supply circuit 04 to supply the second power supply voltage to the first control power supply circuit 03, so that the first control power supply circuit 03 supplies power to the low-voltage-side load 10 based on the second power supply voltage, and controlling the second control power supply circuit 04 to supply power to the high-voltage-side load 20 based on the second power supply voltage.

The first voltage range may be pre-stored in the control circuit 05 or the control circuit 05 may receive a reference voltage with a voltage within the first voltage range, for example, the control circuit 05 may be further connected to a reference power source terminal, which may be used to provide the reference voltage of the first voltage range. The first supply voltage being within the first voltage range may be used to indicate that the low-voltage battery 01 is in a normal operating state, i.e., has not failed. Conversely, a first supply voltage outside the first voltage range may be used to indicate a failure of the low voltage battery 01. As can be seen from the description of the fault in the above embodiment, for example, if the first power supply voltage is greater than the upper limit value of the first voltage range, it may indicate that the low-voltage battery 01 is in an overvoltage fault state; if the first power supply voltage is smaller than the lower limit value of the first voltage range, it may indicate that the low-voltage battery 01 is in an undervoltage fault state.

That is, in the embodiment of the present application, on the one hand, the control circuit 05 can collect the first power supply voltage provided by the low-voltage battery 01, and can reliably detect whether the low-voltage battery 01 has a fault based on the first power supply voltage. On the other hand, the control circuit 05 is capable of controlling the low-voltage side control power supply circuit (i.e., the first control power supply circuit 03) to supply power to the low-voltage side load 10 based on the supply voltage supplied from the low-voltage battery 01 and the high-voltage side control power supply circuit (i.e., the second control power supply circuit 04) to supply power to the high-voltage side load 20 based on the supply voltage supplied from the high-voltage battery 02 when detecting that the low-voltage battery 01 is not malfunctioning; and, when it is detected that the low-voltage battery 01 has a failure, the low-voltage side control power supply circuit and the high-voltage side control power supply circuit are controlled to supply power to the low-voltage side load 10 and the high-voltage side load 20, which are connected, respectively, based on the supply voltage supplied from the high-voltage battery 02. In this way, the problem that the low-voltage side load 10 and the high-voltage side load 20 cannot be normally driven to operate due to the failure of the low-voltage battery 01 is solved.

In summary, the embodiment of the present application provides a control power circuit. The control power supply circuit is applied to an electric vehicle comprising a low-voltage side load and a high-voltage side load, and comprises a low-voltage battery, a high-voltage battery, a first control power supply circuit, a second control power supply circuit and a control circuit. The control circuit can control the first control power supply circuit to supply power to the low-voltage side load based on the first power supply voltage when the first power supply voltage provided by the low-voltage battery is within a voltage range, namely when the low-voltage battery is not in fault, and control the second control power supply circuit to supply power to the high-voltage side load based on the second power supply voltage provided by the high-voltage battery. And the control circuit can control the first control power supply circuit and the second control power supply circuit to respectively supply power to the low-voltage side load and the high-voltage side load based on the second power supply voltage provided by the high-voltage battery when the first power supply voltage provided by the low-voltage battery is out of the voltage range, namely the low-voltage battery fails. Therefore, the low-voltage side load and the high-voltage side load can be still normally driven to work when the low-voltage battery fails. The control power supply circuit has better reliability in supplying power to the low-voltage side load and the high-voltage side load.

The control power supply circuit (including the first control power supply circuit 03 and the second control power supply circuit 04) described in the embodiment of the present application is a circuit that can be used to realize functions such as power transmission, voltage conversion, and isolation, and may also be referred to as a control power supply.

For example, the first control power supply circuit 03 and the second control power supply circuit 04 may each include: an isolated control power supply, and a linear control power supply and/or a non-isolated control power supply.

Optionally, fig. 2 is a schematic structural diagram of another control power supply circuit provided in the embodiment of the present application. As can be seen with reference to fig. 2, the first control power supply circuit 03 and the second control power supply circuit 04 each include: the power supply comprises an isolation control power supply, a linear control power supply and a non-isolation control power supply. In addition, the first control power supply circuit 03 and the second control power supply circuit 04 shown in fig. 2 also include electrical direct connections. The direct electrical connection in the first control power supply circuit 03 is used to indicate that the low-voltage battery 01 is directly connected to the low-voltage side load 10. Similarly, the electrical direct connection in the second control power supply circuit 04 is used for directly connecting the high-voltage battery 02 with the high-voltage side load 20.

The output terminal of the isolation control power supply in the first control power supply circuit 03 may be connected to the input terminal of the isolation control power supply in the second control power supply circuit 04. In the first control power supply circuit 03, the other control power supplies except the isolation control power supply are connected to the input terminal of the isolation control power supply. In the second control power supply circuit 04, the other control power supplies except the isolation control power supply are connected to the output terminal of the isolation control power supply. That is, referring to fig. 2, the first control power supply circuit 03 and the second control power supply circuit 04 may establish connection through the isolated control power supplies each included. On the basis, as shown in fig. 1 and fig. 2, the low-voltage side and the high-voltage side can be electrically isolated by an isolation strip provided by the isolation control power supply, so that signal crosstalk between the low-voltage side and the high-voltage side is avoided.

In the first control power supply circuit 03, the linear control power supply, the isolation control power supply, the non-isolation control power supply and the electrical direct connection can be connected to the same node P0, and the low-voltage battery 01 is connected to the node P0.

And in the second control power supply circuit 04, the linear control power supply, the isolation control power supply and the electrical direct connection can be connected with the isolation control power supply, and the isolation control power supply is connected with the high-voltage battery 02. That is, the linear control power supply, the isolation control power supply, and the electrical direct connection are indirectly connected with the high-voltage battery 02 through the isolation control power supply.

Alternatively, referring to fig. 2, it can also be seen that in the first control power supply circuit 03, the isolated control power supply, the non-isolated control power supply, the linear control power supply and the direct electrical connection are respectively connected to one or more low-voltage side loads 10. In the second control power supply circuit 04, the isolation control power supply, the non-isolation control power supply, the linear control power supply and the direct electrical connection are respectively connected with one or more high-voltage side loads 20. Further, the low voltage side may include a two-stage first control power supply circuit 03. The first control power supply circuit 03 at the previous stage is connected with the low-voltage battery 01 and the node P0, and the first control power supply circuit 03 at the next stage is connected with the node P0 and the second control power supply circuit 04. And the two-stage control power supply circuits connected to each other in the two-stage first control power supply circuit 03 are the same. For example, the isolation control power supply of the first control power supply circuit 03 of the previous stage is connected to the isolation control power supply of the first control power supply circuit 03 of the subsequent stage. The first control power supply circuits 03 according to the following embodiments of the present application are all the subsequent stage first control power supply circuits 03 directly connected to the second control power supply circuit 04.

Optionally, the isolation control power supply may be a control power supply that implements isolation by using an optical isolation technique, and on this basis, the isolation control power supply may include an optical isolator. Alternatively, the isolation control power supply may be a control power supply which uses a magnetic isolation technology to realize insulation isolation, and on this basis, the isolation control power supply may include a transformer as shown in the figure. Or, the isolation control power supply may be a control power supply that is isolated by using a capacitive isolation technology, and on this basis, the isolation control power supply may include a capacitive isolator. The embodiment of the present application takes the isolation control power supply as an example for explanation.

Fig. 3 is a schematic structural diagram of another control power supply circuit provided in an embodiment of the present application. As shown in fig. 3, the control circuit 05 may include a control sub-circuit 051 and a switch sub-circuit 052. The first control power supply circuit 03 and the second control power supply circuit 04 may each have an input terminal, a first output terminal, and a second output terminal.

An input end of the first control power supply circuit 03 may be connected to the low-voltage battery 01, a first output end of the first control power supply circuit 03 may be used to connect to the low-voltage side load 10, and a second output end of the first control power supply circuit 03 may be connected to a second output end of the second control power supply circuit 04.

The input end of the second control power supply circuit 04 may be connected to the high-voltage battery 02, the first output end of the second control power supply circuit 04 may be connected to the input end of the switch sub-circuit 052, the output end of the switch sub-circuit 052 may be connected to the input end of the first control power supply circuit 03, and the second output end of the second control power supply circuit 04 may also be used to be connected to the high-voltage side load 20. That is, the input terminal of the first control power supply circuit 03 is also connected to the first output terminal of the second control power supply circuit 04 through the switch sub-circuit 052.

The control sub-circuit 051 can be respectively connected with the low-voltage battery 01, the control end of the switch sub-circuit 052, the input end of the first control power supply circuit 03 and the input end of the second control power supply circuit 04.

The control sub-circuit 051 may be configured to disconnect the input terminal and the output terminal of the control switch sub-circuit 052 if it is determined that the first power supply voltage is within the first voltage range, that is, if it is determined that the low-voltage battery 01 does not malfunction, and control the input terminal of the first control power supply circuit 03 to receive the first power supply voltage and control the input terminal of the second control power supply circuit 04 to receive the second power supply voltage.

At this time, the input terminal of the first control power supply circuit 03 and the first output terminal of the second control power supply circuit 04 may be disconnected, and then the first output terminal of the second control power supply circuit 04 is not connected to the load. Accordingly, the energy from the high-voltage battery 02 cannot flow from the high-voltage side to the low-voltage side. Moreover, the input terminal of the first control power supply circuit 03 can reliably receive the first power supply voltage from the low-voltage battery 01 and supply power to the low-voltage side load 10 through the first output terminal thereof based on the first power supply voltage. And, because the input terminal of the first control power supply circuit 03 receives the first power supply voltage, and the input terminal of the second control power supply circuit 04 receives the second power supply voltage, it can be determined that the power supply voltage received by the second output terminal of the first control power supply circuit 03 is much smaller than the power supply voltage received by the second output terminal of the second control power supply circuit 04. Accordingly, the energy from the low-voltage battery 01 cannot flow from the low-voltage side to the high-voltage side. Furthermore, the second control power supply circuit 04 can reliably receive the second supply voltage from the high-voltage battery 02 and supply power to the high-voltage side load 20 through its second output terminal based on the second supply voltage. In this control mode, no energy flows between the low pressure side and the high pressure side, i.e. no energy is transferred.

And, the control sub-circuit 051 may be further configured to, if it is determined that the first power supply voltage is out of the first voltage range, that is, if it is determined that the low-voltage battery 01 has a fault, control the input terminal and the output terminal of the switch sub-circuit 052 to be turned on, and control the input terminal of the second control power supply circuit 04 to receive the second power supply voltage.

At this time, the input terminal of the first control power supply circuit 03 and the first output terminal of the second control power supply circuit 04 may be turned on, and then the first output terminal of the second control power supply circuit 04 is connected to the load. Accordingly, the second power supply voltage received by the input terminal of the second control power supply circuit 04 may be reliably transmitted to the input terminal of the first control power supply circuit 03 through the switch sub-circuit 052, that is, the input terminal of the first control power supply circuit 03 may receive the second power supply voltage provided by the high-voltage battery 01 and supply power to the low-voltage side load 10 through the first output terminal thereof based on the second power supply voltage. At the same time, the input of the second control power supply circuit 04 can reliably supply power to the high-voltage-side load 20 via its second output based on the received second supply voltage. That is, in this control mode, the energy from the high-voltage battery 02 can flow from the high-voltage side to the low-voltage side.

For example, in the embodiment of the present application, the control sub-circuit 051 may provide a switch control signal of an invalid potential to the control terminal of the switch sub-circuit 052 to control the input terminal of the switch sub-circuit 052 to be disconnected from the output terminal. And, the control sub-circuit 051 can provide a switch control signal of effective potential to the control end of the switch sub-circuit 052 so as to control the conduction of the input end and the output end of the switch sub-circuit 052.

It should be noted that, in combination with the above embodiments, the isolated control power supply of the first control power supply circuit 03 and the isolated control power supply of the second control power supply circuit 04 here have an input terminal, a first output terminal, and a second output terminal, respectively. In addition, since the embodiment of the present application takes the isolated control power supply as an example for description, as shown in fig. 3, the input terminal, the first output terminal, and the second output terminal may all be the coils shown in fig. 3.

Fig. 4 is a schematic structural diagram of another control power supply circuit according to an embodiment of the present application. As shown in fig. 4, the control sub-circuit 051 is also connected to the high voltage battery 02. On this basis, the control sub-circuit 051 may be configured to:

if the first power supply voltage is determined to be within the first voltage range and the second power supply voltage is determined to be within the second voltage range, the input terminal of the control switch sub-circuit 052 is disconnected from the output terminal, the input terminal of the first control power supply circuit 03 is controlled to receive the first power supply voltage, and the input terminal of the second control power supply circuit 04 is controlled to receive the second power supply voltage.

If it is determined that the first power supply voltage is outside the first voltage range and the second power supply voltage is within the second voltage range, the input terminal of the control switch sub-circuit 052 is conducted with the output terminal thereof, and the input terminal of the second control power supply circuit 04 is controlled to receive the second power supply voltage.

And if it is determined that the first supply voltage is within the first voltage range and the second supply voltage is outside the second voltage range, controlling the input terminal of the switch sub-circuit 052 to be disconnected from the output terminal, controlling the input terminal of the first control power circuit 03 to receive the first supply voltage, and controlling the input terminal of the second control power circuit 04 to stop receiving the second supply voltage.

At this time, the input terminal of the first control power supply circuit 03 and the first output terminal of the second control power supply circuit 04 may be disconnected, and then, the first output terminal of the second control power supply circuit 04 is not connected to the load, and the input terminal of the first control power supply circuit 03 may reliably receive the first power supply voltage from the low-voltage battery 01. Moreover, since the input terminal of the second control power circuit 04 stops receiving the second power supply voltage, the second output terminal of the second control power circuit 04 cannot receive the second power supply voltage. Furthermore, the first power supply voltage received by the input terminal of the first control power supply circuit 03 can naturally flow to the second output terminal of the second control power supply circuit 04 through the second output terminal of the first control power supply circuit 03, so as to supply power to the high-voltage side load 20 connected to the second output terminal of the second control power supply circuit 04. That is, the second control power supply circuit 04 can supply power to the low-voltage-side load based on the first power supply voltage supplied from the low-voltage battery 01 at this time. That is, in this control mode, the energy from the low-voltage battery 01 can flow from the low-voltage side to the high-voltage side.

Optionally, the first voltage range and the second voltage range may both be pre-stored in a control sub-circuit 051 included in the control circuit 05, or the control sub-circuit 051 may receive a first reference voltage having a voltage within the first voltage range and a second reference voltage having a voltage within the second voltage range, for example, the control sub-circuit 051 may be further connected to a first reference power terminal and a second reference power terminal, the first reference power terminal may be configured to provide a reference voltage of the first voltage range, and the second reference power terminal may be configured to provide a reference voltage of the second voltage range. And, the lower limit of the second voltage range may be higher than the upper limit of the first voltage range.

Wherein the second supply voltage being within the second voltage range may be used to indicate that the high voltage battery 02 is in a normal operating state, i.e. has not failed. Conversely, a second supply voltage outside the second voltage range may be used to indicate a failure of the high voltage battery 02. The failure of the high-voltage battery 02 may also include, similarly to the failure of the low-voltage battery 01: lost connections, over-voltage, under-voltage, and/or short circuits.

Therefore, in the embodiment of the present application, the control sub-circuit 051 may further collect the second power supply voltage provided by the high-voltage battery 02, and may reliably detect whether the high-voltage battery 02 has a fault or not based on the second power supply voltage. And the control sub-circuit 051 can control the first control power supply circuit 03 to supply power to the low-voltage side load 10 based on the power supply voltage provided by the low-voltage battery 01 and control the second control power supply circuit 04 to supply power to the high-voltage side load 20 based on the power supply voltage provided by the high-voltage battery 02 when detecting that the low-voltage battery 01 and the high-voltage battery 02 are not in fault. And the control sub-circuit 051 can control the first control power supply circuit 03 and the second control power supply circuit 04 to respectively supply power to the connected low-voltage side load 10 and the high-voltage side load 20 based on the power supply voltage provided by the high-voltage battery 02 when the low-voltage battery 01 is detected to be in fault and the high-voltage battery 02 is not in fault. And the control sub-circuit 051 is also capable of controlling the first control power supply circuit 03 and the second control power supply circuit 04 to respectively supply power to the connected low-voltage side load 10 and high-voltage side load 20 based on the power supply voltage provided by the low-voltage battery 01 when the low-voltage battery 01 is detected not to be in fault and the high-voltage battery 02 is in fault.

Of course, in some embodiments, the control sub-circuit 051 may also be used to detect whether the high-voltage battery 02 is powered up, and when detecting that the high-voltage battery 02 is not powered up, control the first control power supply circuit 03 and the second control power supply circuit 04 to respectively supply power to the connected low-voltage side load 10 and the high-voltage side load 20 based on the power supply voltage provided by the low-voltage battery 01.

Fig. 5 is a schematic structural diagram of another control power supply circuit according to an embodiment of the present application. As shown in fig. 5, the control sub-circuit 051 may include: the device comprises a first detection unit 0511, a second detection unit 0512, a control unit 0513 and a logic processing unit 0514.

Wherein, the first detection unit 0511 may be connected with the low voltage battery 01 and the control unit 0513, respectively. The first detection unit 0511 may be configured to collect the first supply voltage, and may provide the first driving signal to the control unit 0513 when detecting that the first supply voltage is within the first voltage range, and may provide the second driving signal to the control unit 0513 when detecting that the first supply voltage is outside the first voltage range. That is, the first driving signal may be used to indicate that the low voltage battery 01 is not faulty, and the second driving signal may be used to indicate that the low voltage battery 01 is faulty.

The second detection unit 0512 may be connected to the high voltage battery 02 and the logic processing unit 0514, respectively. The second detection unit 0512 may be configured to collect the second supply voltage, and when detecting that the second supply voltage is within the second voltage range, provide the third drive signal to the logic processing unit 0514, and when detecting that the second supply voltage is outside the second voltage range, provide the fourth drive signal to the logic processing unit 0514. That is, the third driving signal may be used to indicate that the high voltage battery 02 is not faulty, and the fourth driving signal may be used to indicate that the high voltage battery 02 is faulty.

The control unit 0513 can also be connected with the control end of the switch sub-circuit 052, the input end of the first control power supply circuit 03 and the logic processing unit 0514 respectively. The control unit 0513 may be configured to control the input terminal of the switch sub-circuit 052 to be disconnected from the output terminal based on the first driving signal, provide an enable signal to the input terminal of the first control power supply circuit 03, control the input terminal of the first control power supply circuit 03 to receive the first supply voltage, and provide the fifth driving signal to the logic processing unit 0514. And the control unit 0513 may be configured to control the input terminal and the output terminal of the switch sub-circuit 052 to be conducted based on the second driving signal, provide an enable signal to the input terminal of the first control power supply circuit 03, so as to control the input terminal of the first control power supply circuit 03 to receive the second supply voltage, and provide the sixth driving signal to the logic processing unit 0514. As can be seen from the above description of the embodiment, the fifth driving signal may be used to indicate that the low-voltage battery 01 has not failed, and the sixth driving signal may be used to indicate that the low-voltage battery 01 has failed.

The logic processing unit 0514 can also be connected with the input end of the second control power supply circuit 04. The logic processing unit 0514 can be used for providing an enabling signal to the input end of the second control power supply circuit 04 based on the third driving signal and the fifth driving signal so as to control the input end of the second control power supply circuit 04 to receive the second power supply voltage, providing a disabling signal to the input end of the second control power supply circuit 04 based on the fourth driving signal and the fifth driving signal so as to control the input end of the second control power supply circuit 04 to stop receiving the second power supply voltage (namely, not receiving the second power supply voltage), and providing an enabling signal to the input end of the second control power supply circuit 04 based on the third driving signal and the sixth driving signal so as to control the input end of the second control power supply circuit 04 to receive the second power supply voltage.

Optionally, in the embodiment of the present application, the fifth driving signal may be the same as or different from the first driving signal. The sixth drive signal may be the same as the second drive signal or may be different. In the embodiment of the present application, the first to sixth driving signals may all be in the form of binary numbers. For example, the first and fifth driving signals indicating that the low voltage battery 01 has not failed may be both 1, and the second and sixth driving signals indicating that the low voltage battery 01 has failed may be both 0. Whether the high-voltage battery 02 fails or not is the same.

Optionally, as can be seen with continued reference to fig. 5, the control sub-circuit 051 may further include: an isolation unit 0515. The control unit 0513 may be connected to the logic processing unit 0514 through an isolation unit 0515, and the isolation unit 0515 is used to achieve electrical isolation between the control unit 0513 and the logic processing unit 0514.

Fig. 6 is a schematic structural diagram of another control power supply circuit according to an embodiment of the present application. As can be seen with reference to fig. 6, switch sub-circuit 052 includes: the transistor K1 is switched.

The gate of the switching transistor K1 may be connected to the control sub-circuit 051, the first pole of the switching transistor K1 may be connected to the first output terminal of the second control power supply circuit 04, and the second pole of the switching transistor K1 may be connected to the input terminal of the first control power supply circuit 03.

Alternatively, the switching transistor K1 may be an N-type transistor or may be a P-type transistor. When the switching transistor K1 is an N-type transistor, the potential of the switching control signal for turning on the switching transistor K1 may be a high potential with respect to the potential of the switching control signal for turning off the switching transistor K1, that is, the effective potential of the switching transistor K1 may be a high potential. When the switching transistor K1 is a P-type transistor, the potential of the switching control signal for controlling the switching transistor K1 to be turned on may be low relative to the potential of the switching control signal for controlling the switching transistor K1 to be turned off, that is, the effective potential of the switching transistor K1 may be low.

Optionally, the switch sub-circuit 052 may further include: a Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET), an Insulated Gate Bipolar Transistor (IGBT), or a relay.

Optionally, as can be seen with continued reference to fig. 6, the first detection unit 0511 may include: a first voltage sampling resistor R1 and a first voltage comparator VC1.

One end of the first voltage sampling resistor R1 may be connected to the low-voltage battery 01, the other end of the first voltage sampling resistor R1 may be connected to a first input terminal of the first voltage comparator VC1, a second input terminal of the first voltage comparator VC1 may be connected to the first reference power source terminal Vr1, and an output terminal of the first voltage comparator VC1 may be connected to the control unit 0513. The voltage of the first reference power supply signal supplied from the first reference power supply terminal Vr1 may be within the first voltage range described in the above embodiments.

That is, in the embodiment of the present application, the first supply voltage provided by the low-voltage battery 01 may be collected through the first voltage sampling resistor R1. The first voltage comparator VC1 may compare the first supply voltage with the first voltage range, determine whether the first supply voltage is within the first voltage range, and output a comparison result to the control unit 0513, so that the control unit 0513 reliably determines whether the low-voltage battery 01 malfunctions based on the comparison result.

Optionally, as can be seen with continued reference to fig. 6, the second detection unit 0512 may include: a second voltage sampling resistor R2 and a second voltage comparator VC2.

One end of the second voltage sampling resistor R2 may be connected to the high voltage battery 02, the other end of the second voltage sampling resistor R2 may be connected to a first input terminal of a second voltage comparator VC2, a second input terminal of the second voltage comparator VC2 may be connected to a second reference power source terminal Vr2, and an output terminal of the second voltage comparator VC2 may be connected to the logic processing unit 0514. The voltage of the second reference power supply signal supplied from the second reference power supply terminal Vr2 may be within the second voltage range described in the above embodiments.

Similarly, in the embodiment of the present application, the second power supply voltage provided by the high voltage battery 02 may be collected through the second voltage sampling resistor R2. The second supply voltage and the first voltage range can be compared by the second voltage comparator VC2, whether the second supply voltage is within the second voltage range is determined, and the comparison result is output to the logic processing unit 0514, so that the logic processing unit 0514 reliably determines whether the high-voltage battery 02 fails based on the comparison result.

Optionally, as can be seen with continued reference to fig. 6, the control Unit 0513 may be a Microcontroller Unit (MCU). On the basis, in some embodiments, the first voltage comparator VC1 may also be integrated with the MCU, and accordingly, the first voltage range may be stored in the MCU in advance. Thus, the structure can be simplified.

Optionally, as can be seen with continued reference to fig. 6, the logic processing unit 0514 may be an and gate. The first input end of the and gate may be connected to the control unit 0513, the second input end of the and gate may be connected to the second detection unit 0512, and the output end of the and gate may be connected to the input end of the second control power supply circuit 04.

Of course, in some other embodiments, the logic processing unit 0514 may be other gates capable of implementing the above-mentioned functions, such as an exclusive or gate.

It should be noted that, in a scenario of detecting only whether the low-voltage battery 01 has a fault, the logic processing unit 0514 may be used only for transmitting the received signal, that is, no logic processing is performed. For example, the logic processing unit 0514 may have a second input terminal connected to the second detection unit 0512, among the terminals thereof, by-passing.

Optionally, as can be seen with continued reference to fig. 6, isolation unit 0515 may be a digital isolator. The digital isolator is a chip for realizing low-voltage side and high-voltage side resistance isolation. As described in the above embodiments, the isolation technique employed by the digital isolator may include: optical coupling isolation techniques, magnetic coupling isolation techniques, or capacitive isolation techniques. The embodiment of the present application takes the digital isolator as an example of a transformer that realizes isolation by using a magnetic coupling isolation technique.

The following description will be made with reference to the control power supply circuit structures shown in fig. 5 and 6, on the operating principle of the control power supply circuit according to the embodiments of the present application, in which the various operating conditions are:

taking the case that neither the low-voltage battery 01 nor the high-voltage battery 02 has a fault (this operating condition may be referred to as operating condition 1) as an example, fig. 7 shows a schematic diagram of an operating principle of a control power supply circuit.

As can be seen with reference to fig. 7, in this scenario, the MCU may supply a switching control signal of the inactive potential to the control terminal of the switching sub-circuit 052 and may supply an enable signal to the input terminal of the first control power supply circuit 03. The logic processing unit 0514 may provide the enable signal to the input terminal of the second control power supply circuit 04. The switch sub-circuit 052 may respond to the switch control signal to control the disconnection between the first output terminal of the second control power supply circuit 04 and the input terminal of the first control power supply circuit 03, and then, the first output terminal of the second control power supply circuit 04 has no load, and no energy interaction, that is, no current transmission, is performed between the input terminal and the first output terminal of the second control power supply circuit 04. The input terminal of the first control power supply circuit 03 may reliably receive the first supply voltage provided by the low-voltage battery 01 in response to the received enable signal. The input terminal of the second control power supply circuit 04 may reliably receive the second supply voltage provided by the high-voltage battery 02 in response to the received enable signal. Since the second power supply voltage is greater than the first power supply voltage, energy transmission between the input terminal and the second output terminal of the first control power supply circuit 03 is also disabled. Thus, the first control power supply circuit 03 can supply power to the low-voltage-side load 10 through the first output terminal thereof based on the first power supply voltage, and the second control power supply circuit 04 can supply power to the high-voltage-side load 20 through the second output terminal thereof based on the second power supply voltage. In the whole process, no energy flows on the low-voltage side and the high-voltage side, namely no current is transmitted.

By taking the case that the low-voltage battery 01 is not in fault and the high-voltage battery 02 is in fault (this working condition may be referred to as working condition 2), fig. 8 shows a schematic diagram of the working principle of another control power supply circuit.

As can be seen with reference to fig. 8, in this scenario, the MCU may supply a switching control signal of an inactive potential to the control terminal of the switching sub-circuit 052 and may supply an enable signal to the input terminal of the first control power supply circuit 03. The logic processing unit 0514 can provide the de-enable signal to the input end of the second control power supply circuit 04. The switch sub-circuit 052 may respond to the switch control signal to control the disconnection between the first output terminal of the second control power supply circuit 04 and the input terminal of the first control power supply circuit 03, and then, the first output terminal of the second control power supply circuit 04 has no load, and no energy interaction, that is, no current transmission, can be performed between the input terminal of the second control power supply circuit 04 and the first output terminal. The input terminal of the first control power supply circuit 03 may reliably receive the first supply voltage provided by the low-voltage battery 01 in response to the received enable signal. The input of the second control power supply circuit 04 may stop receiving the second supply voltage provided by the high voltage battery 02 in response to the received disable signal. At this time, energy interaction can be performed between the input terminal and the second output terminal of the first control power supply circuit 03, and then the first supply voltage received by the input terminal of the first control power supply circuit 03 can be naturally transmitted to the second output terminal of the second control power supply circuit 04 through the second output terminal thereof. Thus, the first control power supply circuit 03 may supply power to the low-voltage side load 10 through the first output terminal thereof based on the first power supply voltage, and the second control power supply circuit 04 may supply power to the high-voltage side load 20 through the second output terminal thereof based on the first power supply voltage. Throughout the process, energy from the low voltage battery may flow from the low voltage side to the high voltage side.

By taking the case that the low-voltage battery 01 fails and the high-voltage battery 02 does not fail (this operating condition may be referred to as operating condition 3), fig. 9 shows a schematic diagram of the operating principle of another control power supply circuit.

As can be seen with reference to fig. 9, in this scenario, the MCU may supply a switching control signal of an active potential to the control terminal of the switching sub-circuit 052 and may supply an enable signal to the input terminal of the first control power supply circuit 03. The logic processing unit 0514 may provide the enable signal to the input terminal of the second control power supply circuit 04. The switch sub-circuit 052 may respond to the switch control signal to control the first output terminal of the second control power supply circuit 04 to be conducted with the input terminal of the first control power supply circuit 03, and then, the first output terminal of the second control power supply circuit 04 is connected to the load, and energy interaction may be performed between the input terminal and the first output terminal of the second control power supply circuit 04, that is, no current is transmitted. Further, the first output terminal of the second control power supply circuit 04 may be used as an input terminal of the first control power supply circuit 03, instead of the low-voltage battery 01. The input terminal of the second control power supply circuit 04 may receive the second power supply voltage provided by the high-voltage battery 02 in response to the received enable signal, and the second power supply voltage may be transmitted to the input terminal of the first control power supply circuit 03 through the first output terminal of the second control power supply circuit 04, that is, the input terminal of the first control power supply circuit 03 may reliably receive the second power supply voltage provided by the high-voltage battery 02 in response to the received enable signal. Thus, the first control power supply circuit 03 can supply power to the low-voltage-side load 10 through the first output terminal thereof based on the second supply voltage, and the second control power supply circuit 04 can also supply power to the high-voltage-side load 20 through the second output terminal thereof based on the second supply voltage. Throughout the process, energy from the high voltage battery may flow from the high voltage side to the low voltage side.

In fig. 7 to 9, the ON signal represents the switch control signal and the enable signal of the active potential, the OFF signal represents the disable signal, and the x signal represents no energy exchange.

Based on the above description, the control power supply circuit provided in the embodiment of the present application may operate under three operating conditions, where in a scenario of operating condition 1, the low-voltage battery 01 supplies power to the low-voltage side load 10 through the low-voltage side control power supply circuit, and the high-voltage battery 02 supplies power to the high-voltage side load 20 through the high-voltage side control power supply circuit. Under the working condition 2 scene, the low-voltage battery 01 supplies power to the low-voltage side load 10 through the low-voltage side control power circuit, and the low-voltage battery 01 also supplies power to the high-voltage side load 20 through the high-voltage side control power circuit. Under the working condition 3, the high-voltage battery 02 supplies power to the high-voltage side load 20 through the high-voltage side control power circuit, and the high-voltage battery 02 also supplies power to the low-voltage side load 10 through the low-voltage side control power circuit. Therefore, no matter the low-voltage battery 01 or the high-voltage battery 02 fails, reliable power supply to the low-voltage side load 10 and the high-voltage side load 20 can be achieved, namely the low-voltage side load 10 and the high-voltage side load 20 can normally receive a control command of the vehicle control unit to enter a safe working state. Especially, for the high-voltage side load 20, it will not be powered down or damaged due to the failure of the low-voltage battery 01, and the high-voltage safety problem will not occur. Therefore, the functional robustness of the high-voltage side load is greatly improved, and the working reliability and safety of the high-voltage side load are high. In addition, through setting up three kinds of different operating modes above control power supply circuit, still improved the power supply flexibility, ensure that power supply efficiency can be better, the power supply loss is lower, has great help to the whole car mileage.

In summary, the embodiment of the present application provides a control power circuit. The control power supply circuit is applied to an electric vehicle comprising a low-voltage side load and a high-voltage side load, and comprises a low-voltage battery, a high-voltage battery, a first control power supply circuit, a second control power supply circuit and a control circuit. The control circuit can control the first control power supply circuit to supply power to the low-voltage side load based on the first power supply voltage when the first power supply voltage provided by the low-voltage battery is within a voltage range, namely when the low-voltage battery is not in fault, and control the second control power supply circuit to supply power to the high-voltage side load based on the second power supply voltage provided by the high-voltage battery. And the control circuit can control the first control power supply circuit and the second control power supply circuit to respectively supply power to the low-voltage side load and the high-voltage side load based on the second power supply voltage provided by the high-voltage battery when the first power supply voltage provided by the low-voltage battery is out of the voltage range, namely the low-voltage battery fails. Therefore, the low-voltage side load and the high-voltage side load can be still normally driven to work when the low-voltage battery fails. The control power supply circuit has good reliability in supplying power to the low-voltage side load and the high-voltage side load.

Fig. 10 is a schematic structural diagram of an electric vehicle according to an embodiment of the present application. As shown in fig. 10, the electric vehicle includes: a low-side load 10, a high-side load 20, and a control power supply circuit 00 as shown in any one of fig. 1 to 9.

The control power supply circuit 00 is connected to the low-voltage side load 10 and the high-voltage side load 20, and supplies power to the low-voltage side load 10 and the high-voltage side load 20.

Alternatively, the electric vehicle described in the embodiment of the present application may be an electric vehicle including four wheels as shown in fig. 10, and the electric vehicle may be a pure electric vehicle, or may also be a hybrid electric vehicle, that is, a hybrid vehicle. The pure electric vehicle is a vehicle driven by a vehicle-mounted power supply as a unique power source, namely the pure electric vehicle does not use a thermal power source provided by a traditional gasoline engine or a traditional diesel engine as a power source. A hybrid vehicle is a vehicle equipped with two power sources including a thermal power source generated by a gasoline engine or a diesel engine, and an electric power source generated by a battery and an electric motor.

Of course, in some other embodiments, the electric vehicle may also be an electric bicycle including two wheels, and the number of wheels of the electric vehicle is not limited in the embodiments of the present application.

In addition, the electric vehicle described in the embodiment of the present application may be used to accommodate one or more users. Alternatively, the vehicle may be a vehicle with an automatic driving capability, i.e., an unmanned vehicle. Accordingly, the electric vehicle can be applied to the field of unmanned distribution, that is, the electric vehicle can automatically move to a designated place to complete cargo distribution and/or provide charging service for a user under the condition of unmanned driving.

It is to be understood that the terminology used in the description of the embodiments herein is for the purpose of describing the embodiments herein only, and is not intended to be limiting of the application. Unless otherwise defined, technical or scientific terms used in the embodiments of the present application should have the ordinary meaning as understood by those having ordinary skill in the art to which the present application belongs.

For example, the terms "first," second, "third," or "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Likewise, the meaning of "at least one" refers to one or more than one. The meaning of "plurality" refers to two or more.

The word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprising" or "comprises" and its equivalents, and does not exclude other elements or items.

"upper", "lower", "left", or "right", etc. are used merely to indicate relative positional relationships, which may also change accordingly when the absolute position of the object being described changes.

"and/or" means that three relationships may exist, e.g., A and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A control power supply circuit characterized by being applied to an electric vehicle whose high-voltage system includes a low-voltage side load (10) and a high-voltage side load (20); the control power supply circuit includes: the device comprises a low-voltage battery (01), a high-voltage battery (02), a first control power supply circuit (03), a second control power supply circuit (04) and a control circuit (05);

the low-voltage battery (01) is connected with the first control power supply circuit (03) and is used for providing a first power supply voltage for the first control power supply circuit (03);

the high-voltage battery (02) is connected with the second control power supply circuit (04) and is used for providing a second power supply voltage to the second control power supply circuit (04), and the second power supply voltage is higher than the first power supply voltage;

the first control power supply circuit (03) is further connected with the second control power supply circuit (04), the first control power supply circuit (03) is further used for being connected with the low-voltage side load (10), and the second control power supply circuit (04) is further used for being connected with the high-voltage side load (20);

the control circuit (05) is connected to the low-voltage battery (01), the first control power supply circuit (03), and the second control power supply circuit (04), respectively, and the control circuit (05) is configured to:

if it is determined that the first power supply voltage is within a first voltage range, controlling the first control power supply circuit (03) to supply power to the low-voltage-side load (10) based on the first power supply voltage, and controlling the second control power supply circuit (04) to supply power to the high-voltage-side load (20) based on the second power supply voltage;

if it is determined that the first power supply voltage is outside the first voltage range, controlling the second control power supply circuit (04) to supply the second power supply voltage to the first control power supply circuit (03) so that the first control power supply circuit (03) supplies power to the low-voltage-side load (10) based on the second power supply voltage, and controlling the second control power supply circuit (04) to supply power to the high-voltage-side load (20) based on the second power supply voltage;

wherein the first supply voltage is within a first voltage range for indicating that the low-voltage battery (01) is not faulty, and the first supply voltage is outside the first voltage range for indicating that the low-voltage battery (01) is faulty;

the first control power supply circuit (03) and the second control power supply circuit (04) each include: isolating the control power supply; the control circuit (05) comprises a control sub-circuit (051) and a switch sub-circuit (052); the isolation control power supply included by the first control power supply circuit (03) and the isolation control power supply included by the second control power supply circuit (04) are respectively provided with an input end, a first output end and a second output end;

the input end of an isolation control power supply in the first control power supply circuit (03) is connected with the low-voltage battery (01), the first output end of the isolation control power supply in the first control power supply circuit (03) is used for being connected with the low-voltage side load (10), and the second output end of the isolation control power supply in the first control power supply circuit (03) is connected with the second output end of the isolation control power supply in the second control power supply circuit (04);

the input end of an isolation control power supply in the second control power supply circuit (04) is connected with the high-voltage battery (02), the first output end of the isolation control power supply in the second control power supply circuit (04) is connected with the input end of the switch sub-circuit (052), the output end of the switch sub-circuit (052) is connected with the input end of the isolation control power supply in the first control power supply circuit (03), and the second output end of the isolation control power supply in the second control power supply circuit (04) is also used for being connected with the high-voltage side load (20);

the control sub-circuit (051) respectively with low-voltage battery (01), the control end of switch sub-circuit (052), the input of isolation control power supply in first control power supply circuit (03) and the input of isolation control power supply in second control power supply circuit (04) are connected.

2. Control power supply circuit according to claim 1, characterized in that the control sub-circuit (051) is configured to:

if the first power supply voltage is determined to be in the first voltage range, controlling the input end and the output end of the switch sub-circuit (052) to be disconnected, controlling the input end of the first control power supply circuit (03) to receive the first power supply voltage, and controlling the input end of the second control power supply circuit (04) to receive the second power supply voltage;

and if the first power supply voltage is determined to be out of the first voltage range, controlling the input end and the output end of the switch sub-circuit (052) to be conducted, and controlling the input end of the second control power supply circuit (04) to receive the second power supply voltage.

3. The control power supply circuit according to claim 1, wherein the switch sub-circuit (052) comprises: a switching transistor (K1);

the grid electrode of the switch transistor (K1) is connected with the control sub-circuit (051), the first pole of the switch transistor (K1) is connected with the first output end of the second control power supply circuit (04), and the second pole of the switch transistor (K1) is connected with the input end of the first control power supply circuit (03).

4. Control power supply circuit according to claim 1, characterized in that the control sub-circuit (051) is also connected to the high voltage battery (02); the control sub-circuit (051) is configured to:

if the first power supply voltage is determined to be in the first voltage range and the second power supply voltage is determined to be in the second voltage range, controlling the input end of the switch sub-circuit (052) to be disconnected from the output end, controlling the input end of the first control power supply circuit (03) to receive the first power supply voltage, and controlling the input end of the second control power supply circuit (04) to receive the second power supply voltage, wherein the lower limit of the second voltage range is higher than the upper limit of the first voltage range;

if the first power supply voltage is determined to be out of the first voltage range and the second power supply voltage is determined to be within the second voltage range, controlling the input end and the output end of the switch sub-circuit (052) to be conducted and controlling the input end of the second control power supply circuit (04) to receive the second power supply voltage;

if the first power supply voltage is determined to be in the first voltage range and the second power supply voltage is determined to be out of the second voltage range, the input end and the output end of the switch sub-circuit (052) are controlled to be disconnected, the input end of the first control power supply circuit (03) is controlled to receive the first power supply voltage, and the input end of the second control power supply circuit (04) is controlled to stop receiving the second power supply voltage.

5. Control power supply circuit according to claim 4, characterized in that the control sub-circuit (051) comprises: the device comprises a first detection unit (0511), a second detection unit (0512), a control unit (0513) and a logic processing unit (0514);

the first detection unit (0511) is respectively connected with the low-voltage battery (01) and the control unit (0513), the first detection unit (0511) is used for collecting the first power supply voltage, when the first power supply voltage is detected to be located in the first voltage range, a first driving signal is provided for the control unit (0513), and when the first power supply voltage is detected to be located outside the first voltage range, a second driving signal is provided for the control unit (0513);

the second detection unit (0512) is respectively connected with the high-voltage battery (02) and the logic processing unit (0514), the second detection unit (0512) is used for collecting the second power supply voltage, when the second power supply voltage is detected to be located in the second voltage range, a third driving signal is provided for the logic processing unit (0514), and when the second power supply voltage is detected to be located out of the second voltage range, a fourth driving signal is provided for the logic processing unit (0514);

the control unit (0513) is also connected with the control end of the switch sub-circuit (052), the input end of the first control power supply circuit (03) and the logic processing unit (0514) respectively, the control unit (0513) is used for controlling the input end and the output end of the switch sub-circuit (052) to be disconnected based on the first driving signal, providing an enabling signal for the input end of the first control power supply circuit (03) so as to control the input end of the first control power supply circuit (03) to receive the first power supply voltage and providing a fifth driving signal for the logic processing unit (0514); based on the second driving signal, controlling the input end and the output end of the switch sub-circuit (052) to be conducted, providing an enabling signal for the input end of the first control power supply circuit (03), so as to control the input end of the first control power supply circuit (03) to receive the second power supply voltage, and providing a sixth driving signal for the logic processing unit (0514);

the logic processing unit (0514) is also connected with the input end of the second control power supply circuit (04), the logic processing unit (0514) is used for providing an enabling signal to the input end of the second control power supply circuit (04) based on the third driving signal and the fifth driving signal so as to control the input end of the second control power supply circuit (04) to receive the second power supply voltage, providing a disabling signal to the input end of the second control power supply circuit (04) based on the fourth driving signal and the fifth driving signal so as to control the input end of the second control power supply circuit (04) to stop receiving the second power supply voltage, and providing an enabling signal to the input end of the second control power supply circuit (04) based on the third driving signal and the sixth driving signal so as to control the input end of the second control power supply circuit (04) to receive the second power supply voltage.

6. The control power supply circuit according to claim 5, wherein the first detection unit (0511) comprises: a first voltage sampling resistor (R1) and a first voltage comparator (VC 1);

one end of the first voltage sampling resistor (R1) is connected with the low-voltage battery (01), the other end of the first voltage sampling resistor (R1) is connected with a first input end of a first voltage comparator (VC 1), a second input end of the first voltage comparator (VC 1) is connected with a first reference power supply end (Vr 1), and an output end of the first voltage comparator (VC 1) is connected with the control unit (0513);

wherein the voltage of the first reference supply signal provided by the first reference supply terminal (Vr 1) is within the first voltage range.

7. Control power supply circuit according to claim 5, characterized in that the second detection unit (0512) comprises: a second voltage sampling resistor (R2) and a second voltage comparator (VC 2);

one end of the second voltage sampling resistor (R2) is connected with the high-voltage battery (02), the other end of the second voltage sampling resistor (R2) is connected with a first input end of a second voltage comparator (VC 2), a second input end of the second voltage comparator (VC 2) is connected with a second reference power supply end (Vr 2), and an output end of the second voltage comparator (VC 2) is connected with the logic processing unit (0514);

wherein a voltage of the second reference power supply signal provided by the second reference power supply terminal (Vr 2) is within the second voltage range.

8. Control power supply circuit according to claim 5, characterized in that the control unit (0513) is a micro control unit MCU.

9. The control power supply circuit according to claim 5, wherein the logic processing unit (0514) is an AND gate;

the first input end of the AND gate is connected with the control unit (0513), the second input end of the AND gate is connected with the second detection unit (0512), and the output end of the AND gate is connected with the input end of the second control power supply circuit (04).

10. Control power supply circuit according to any of claims 5 to 9, characterized in that the control sub-circuit (051) further comprises: an isolation unit (0515);

the control unit (0513) is connected with the logic processing unit (0514) through the isolation unit (0515), and the isolation unit (0515) is used for realizing the electrical isolation between the control unit (0513) and the logic processing unit (0514).

11. Control power supply circuit according to claim 10, characterized in that the isolation unit (0515) is: a digital isolator.

12. The control power supply circuit according to any one of claims 1 to 9, wherein the first control power supply circuit (03) and the second control power supply circuit (04) further include: a linear control power supply and/or a non-isolated control power supply;

in the first control power supply circuit (03), other control power supplies except the isolation control power supply are connected with the input end of the isolation control power supply;

in the second control power supply circuit (04), other control power supplies except the isolation control power supply are connected with the output end of the isolation control power supply.

13. An electric vehicle, characterized in that the electric vehicle comprises: -a low side load (10), -a high side load (20), and-a control power supply circuit (00) according to any of claims 1 to 12;

the control power supply circuit (00) is connected to the low-voltage-side load (10) and the high-voltage-side load (20), respectively, and is configured to supply power to the low-voltage-side load (10) and the high-voltage-side load (20).