CN220914949U

CN220914949U - Power supply conversion circuit system, electronic equipment and power supply conversion device

Info

Publication number: CN220914949U
Application number: CN202322625006.5U
Authority: CN
Inventors: 曲艳娇
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2023-09-26
Filing date: 2023-09-26
Publication date: 2024-05-07
Anticipated expiration: 2033-09-26

Abstract

The application provides a power supply conversion circuit system, electronic equipment and a power supply conversion device, wherein the power supply conversion circuit system comprises a first switch functional circuit and a second switch functional circuit; in the power supply conversion circuit system, when a first power supply is in a starting state and a second power supply is in a closing state, a first switch function circuit is in a conducting state, a second switch function circuit is in a non-conducting state, and the first switch function circuit in the conducting state is used for transmitting a first power supply voltage provided by the first power supply to a load circuit; when the second power supply is in a starting state, the first switch function circuit is in a non-conducting state, the second switch function circuit is in a conducting state, and the second switch function circuit in the conducting state is used for transmitting a second power supply voltage provided by the second power supply to the load circuit. In the application, the switching of a plurality of power supplies can be realized from the hardware angle, software intervention is not needed, the reliability is high, and the applicability is strong.

Description

Power supply conversion circuit system, electronic equipment and power supply conversion device

Technical Field

The present utility model relates to the field of power technologies, and in particular, to a power supply conversion circuit system, an electronic device, and a power supply conversion device.

Background

An electronic device may have multiple power supply modes, for example, a mobile phone has a USB power supply mode, a wireless power supply mode, etc., and meanwhile, a power supply for supplying power to the electronic device includes multiple power supplies, for example, the power supply of a charging chip of the electronic device may come from VBUS of the USB or from a charger; the power supply of one power supply pin of the micro control unit (Microcontroller Unit; MCU) for power supply may come from one power supply chip, or may come from an external button battery or another power supply chip, etc. The diversity of power supply mode makes the product function richer, and the performance is more stable, but if multiple power exists simultaneously, can cause certain damage to electronic equipment, based on this, when multiple power exists simultaneously, how to select a power inlet wire power supply from multiple power is the current problem that needs to be solved urgently.

Disclosure of utility model

The utility model provides a power supply conversion circuit system, electronic equipment and a power supply conversion device, which can realize the switching of a plurality of power supplies, reduce the voltage loss in a circuit path and have strong applicability.

In a first aspect, the present application provides a power conversion circuitry comprising a first switch function circuit and a second switch function circuit. The first end of the first power supply is connected with the first end of the first switch functional circuit, the first end of the second power supply is connected with the second end of the first switch functional circuit and the first end of the second switch functional circuit, and the third end of the first switch functional circuit is connected with the second end of the second switch functional circuit. Further, when the first power supply is in a start state and the second power supply is in a close state, the first switch function circuit is in a conducting state, the second switch function circuit is in a non-conducting state, and the first switch function circuit in the conducting state is used for transmitting a first power supply voltage provided by the first power supply to the load circuit. Further, when the second power supply is in the starting state, the first switch function circuit is in a non-conducting state, the second switch function circuit is in a conducting state, and the second switch function circuit in the conducting state is used for transmitting the second power supply voltage provided by the second power supply to the load circuit.

With reference to the first aspect, in one possible implementation manner, the first switching function circuit includes a first switching unit, a second switching unit, and a third switching unit. The first end of the first switch unit is connected with the first end of the second switch unit, the second end of the first switch unit is connected with the second end of the second switch unit, the third end of the second switch unit is connected with the first end of the third switch unit, the end formed by connecting the first end of the first switch unit with the first end of the second switch unit is the first end of the first switch function circuit, the second end of the third switch unit is the second end of the first switch function circuit, and the third end of the first switch unit is the third end of the first switch function circuit. Further, when the first power supply is in a starting state and the second power supply is in a closing state, the third switch unit is in a non-conducting state; the third switch unit in a non-conducting state is used for controlling the first switch unit and the second switch unit to be in a conducting state, and the first switch unit and the second switch unit in the conducting state are used for transmitting a first power supply voltage provided by the first power supply to the load circuit. Further, when the second power supply is in a starting state and the first power supply is in a starting state, the third switch unit is in a conducting state; the third switch unit in a conducting state is used for controlling the first switch unit and the second switch unit to be in a non-conducting state, and the first switch unit and the second switch unit in the non-conducting state are used for preventing the first power supply voltage provided by the first power supply from being transmitted to the load circuit.

With reference to the first aspect, in one possible implementation manner, the first switch unit includes a first resistor and a first transistor, a first end of the first resistor is connected to a first end of the first transistor, a second end of the first resistor is connected to a second end of the first transistor, an end formed by connecting the first end of the first resistor and the first end of the first transistor is the first end of the first switch unit, an end formed by connecting the second end of the first resistor and the second end of the first transistor is the third end of the first switch unit, and the third end of the first transistor is the second end of the first switch unit. The second switch unit comprises a second resistor, a third resistor, a fourth resistor and a second transistor, wherein the first end of the second resistor is connected with the first end of the third resistor, the second end of the third resistor is connected with the first end of the fourth resistor and the first end of the second transistor, the second end of the fourth resistor is grounded with the second end of the second transistor, the second end of the second resistor is the first end of the second switch unit, the end formed by connecting the first end of the second resistor with the first end of the third resistor is the second end of the second switch unit, and the third end of the second transistor is the third end of the second switch unit. The third switch unit comprises a fifth resistor, a sixth resistor and a third transistor, wherein the first end of the fifth resistor is connected with the first end of the third transistor and the first end of the sixth resistor, the second end of the sixth resistor is grounded with the second end of the third transistor, the second end of the fifth resistor is the first end of the third switch unit, and the third end of the third transistor is the second end of the third switch unit.

With reference to the first aspect, in one possible implementation manner, when the first power supply is in a start state and the second power supply is in an off state, the sixth resistor is used to control the third transistor to be in a non-conductive state, and the third transistor, the second resistor, the third resistor and the fourth resistor in the non-conductive state are used to control the first transistor and the second transistor to be in a conductive state. Further, when the second power supply is in the starting state, the fifth resistor and the sixth resistor are used for controlling the third transistor to be in the conducting state, the third transistor in the conducting state is used for controlling the second transistor to be in the non-conducting state, and the second transistor and the first resistor in the non-conducting state are used for controlling the first transistor to be in the non-conducting state.

With reference to the first aspect, in one possible implementation manner, a resistance value of the fourth resistor is greater than a resistance value of the second resistor and a resistance value of the third resistor. The resistance value of the sixth resistor is larger than the resistance value of the fifth resistor.

With reference to the first aspect, in a possible implementation manner, the second switching function circuit includes a fourth switching unit and a fifth switching unit. The first end of the fourth switch unit is connected with the first end of the fifth switch unit, the second end of the fourth switch unit is connected with the second end of the fifth switch unit, the end formed by connecting the first end of the fourth switch unit with the first end of the fifth switch unit is the first end of the second switch function circuit, and the third end of the fourth switch unit is the second end of the second switch function circuit. Further, when the second power supply is in a starting state, the fifth switch unit is in a conducting state; the fifth switch unit in a conducting state is used for controlling the fourth switch unit to be in a conducting state, and the fourth switch unit in the conducting state is used for transmitting the second power supply voltage provided by the second power supply to the load circuit.

With reference to the first aspect, in one possible implementation manner, the fourth switch unit includes a seventh resistor and a fourth transistor, a first end of the seventh resistor is connected to the first end of the fourth transistor, a second end of the seventh resistor is connected to the second end of the fourth transistor, an end formed by connecting the first end of the seventh resistor and the first end of the fourth transistor is the first end of the fourth switch unit, an end formed by connecting the second end of the seventh resistor and the second end of the fourth transistor is the second end of the fourth switch unit, and a third end of the fourth transistor is the third end of the fourth switch unit. The fifth switch unit comprises an eighth resistor, a ninth resistor and a fifth transistor, wherein the first end of the eighth resistor is connected with the first end of the ninth resistor and the first end of the fifth transistor, the second end of the ninth resistor is grounded with the second end of the fifth transistor, the second end of the eighth resistor is the first end of the fifth switch unit, and the third end of the fifth transistor is the second end of the fifth switch unit. When the second power supply is in a starting state, the eighth resistor and the ninth resistor are used for controlling the fifth transistor to be in a conducting state, the fifth transistor in the conducting state is used for controlling the fourth transistor to be in a conducting state, and the fourth transistor and the seventh resistor in the conducting state are used for controlling the fourth transistor to be in a conducting state.

With reference to the first aspect, in a possible implementation manner, a resistance value of the ninth resistor is greater than a resistance value of the eighth resistor.

With reference to the first aspect, in a possible implementation manner, the power supply conversion circuit system further includes a third switch function circuit. The second end of the first power supply is connected with the first end of the third switch function circuit, the second end of the second power supply is connected with the second end of the third switch function circuit, the third end of the first switch function circuit and the second end of the second switch function circuit are both connected with the third end of the third switch function circuit, and the fourth end of the third switch function circuit is connected with the load circuit. Further, when the first power supply is in a start state and the second power supply is in a close state, the third switch function circuit is in a conducting state, and the third switch function circuit in the conducting state, the first switch function circuit in the conducting state and the first power supply form a first power supply circuit so as to transmit a first power supply voltage provided by the first power supply to the load circuit. Further, when the second power supply is in the starting state, the third switch function circuit is in a conducting state, and the third switch function circuit in the conducting state, the second switch function circuit in the conducting state and the second power supply form a second power supply circuit so as to transmit a second power supply voltage provided by the second power supply to the load circuit.

With reference to the first aspect, in one possible implementation manner, the third switching function circuit includes a first diode, a second diode, a tenth resistor, an eleventh resistor, a twelfth resistor, a sixth transistor, and a seventh transistor. The first end of the first diode and the first end of the second diode are connected with the first end of the tenth resistor, the second end of the tenth resistor is connected with the first end of the eleventh resistor and the first end of the sixth transistor, the second end of the sixth transistor is connected with the first end of the twelfth resistor and the first end of the seventh transistor, the second end of the seventh transistor is connected with the second end of the twelfth resistor, the second end of the eleventh resistor is grounded with the third end of the sixth transistor, the second end of the first diode is the first end of the third switch function circuit, the second end of the second diode is the second end of the third switch function circuit, the third end of the seventh transistor is the third end of the third switch function circuit, and the end formed by connecting the second end of the seventh transistor and the second end of the twelfth resistor is the fourth end of the third switch function circuit.

With reference to the first aspect, when the first power supply is in a start state and the second power supply is in an off state, the first power supply provides the first power supply voltage to the third switch function circuit, the eleventh resistor is used for controlling the sixth transistor to be in a conducting state, the sixth transistor in the conducting state is used for controlling the seventh transistor to be in a conducting state, and the twelfth resistor is used for preventing the seventh transistor from being in a conducting state when the first power supply is in the off state;

When the first power supply is in a closed state and the second power supply is in an on state, the second power supply provides a second power supply voltage for the third switch function circuit, the eleventh resistor is used for controlling the sixth transistor to be in a conducting state, the sixth transistor in the conducting state is used for controlling the seventh transistor to be in the conducting state, and the twelfth resistor is used for preventing the sixth transistor from being in the conducting state when the second power supply is in the closed state.

In combination with the first aspect, when the first power supply and the second power supply are both in the start-up state, and the first power supply voltage provided by the first power supply is greater than the second power supply voltage provided by the second power supply, the first diode is used for transmitting the first power supply voltage to components except the first diode and the second diode in the third switch function circuit so as to control the sixth transistor and the seventh transistor to be in the on state. The second diode is used for preventing the first power supply voltage from being transmitted to the second power supply.

In combination with the first aspect, when the first power supply and the second power supply are both in the start-up state, and the voltage value of the second power supply voltage provided by the second power supply is greater than the voltage value of the first power supply voltage provided by the first power supply, the second diode is used for transmitting the second power supply voltage to components except the first diode and the second diode in the third switch function circuit so as to control the sixth transistor and the seventh transistor to be in the on state. The first diode is used for preventing the second power supply voltage from being transmitted to the first power supply.

With reference to the first aspect, a resistance value of the eleventh resistor is greater than a resistance value of the tenth resistor.

In a second aspect, the present application provides an electronic device comprising the power conversion circuitry of the first aspect and any of its possible embodiments, the power conversion circuitry being connected to a first power supply, a second power supply and a load circuit.

In a third aspect, the present application provides a power conversion device comprising the power conversion circuitry of the first aspect and any one of its possible embodiments, the power conversion circuitry being connected to a first power source, a second power source and a load circuit.

In the application, by arranging one switching function circuit for each power supply, for example, a plurality of power supplies comprise a first power supply and a second power supply, the first power supply corresponds to the first switching function circuit, the second power supply corresponds to the second switching function circuit, when the first power supply and the second power supply are in a starting state, namely, when the first power supply and the second power supply exist simultaneously, the load circuit can be supplied with power by selecting one power supply from the first power supply and the second power supply through the states of the first switching function circuit and the second switching function circuit, and the damage to the load circuit (such as a charging circuit in electronic equipment) is avoided when the plurality of power supplies exist simultaneously. Meanwhile, when only a single power supply exists, the state of the first switch functional circuit and the state of the second switch functional circuit are switched to the state that the power supply in the starting state supplies power to the load circuit, and the first switch functional power supply and the second switch functional circuit belong to hardware circuits, in other words, the switching of the power supply can be realized through the hardware circuits, software intervention is not needed, and the reliability is higher.

Drawings

Fig. 1 is a schematic diagram of a power supply conversion circuit system according to the present application;

FIG. 2 is a schematic diagram of a first switch circuit according to the present application;

FIG. 3 is a schematic diagram of another structure of the first switch circuit according to the present application;

FIG. 4 is a schematic diagram of a second switch circuit according to the present application;

FIG. 5 is a schematic diagram of another structure of the second switch circuit according to the present application;

FIG. 6 is a schematic diagram of a third switch circuit according to the present application;

FIG. 7 is a schematic diagram of another structure of the third switch circuit according to the present application;

Fig. 8 is a schematic structural diagram of an electronic device according to the present application;

Fig. 9 is a schematic structural diagram of a power supply conversion device provided by the application.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The structure and operation of the control system provided by the present application will be exemplified with reference to fig. 1 to 9.

Fig. 1 is a schematic diagram of a power supply conversion circuit system according to the present application. As shown in fig. 1, the power supply conversion circuitry 3 includes a first switching function circuit 31 and a second switching function circuit 32. The first end of the first power supply 1 is connected to the first end of the first switch function circuit 31, the first end of the second power supply 2 is connected to the second end of the first switch function circuit 31 and the first end of the second switch function circuit 32, and the third end of the first switch function circuit 31 is connected to the second end of the second switch function circuit 32. When the first power supply 1 is in the on state and the second power supply 2 is in the off state, the first switch function circuit 31 is in the on state, the second switch function circuit 32 is in the off state, and the first switch function circuit 31 in the on state is used for transmitting the first power supply voltage provided by the first power supply 1 to the load circuit 4. When the second power supply 2 is in the start-up state, the first switch function circuit 31 is in a non-conductive state, the second switch function circuit 32 is in a conductive state, and the second switch function circuit 32 in the conductive state is used for transmitting the second power supply voltage provided by the second power supply 2 to the load circuit 4. It will be appreciated that the first terminal of the first power supply 1 is used to transmit a first power supply voltage to the first switching function circuit 31 and the first terminal of the second power supply 2 is used to transmit a second power supply voltage to the first switching function circuit 31 and the second switching function circuit 32. It should be appreciated that the load circuit 4 may be an integrated circuit or other post-stage circuit requiring power, and the application is not limited in this regard.

It will be appreciated that the first switch function circuit 31 and the second switch function circuit 32 in the power supply conversion circuit system 3 may implement switching between multiple power supplies, that is, the first switch function circuit 31 may be in a conductive state when the first power supply 1 is in a start state and the second power supply 2 is in a closed state, so as to transmit the first power supply voltage provided by the first power supply 1 to the load circuit 4, and the second switch function circuit 32 may be in a conductive state when the first power supply 1 is in a closed state and the second power supply 2 is in a start state, or both the first power supply 1 and the second power supply 2 are in a start state, so as to transmit the second power supply voltage provided by the second power supply 2 to the load circuit 4. That is, the power supply conversion circuit system 3 provided by the application can supply power to the load circuit 4 when a single power supply is in a starting state, and can also preferentially enable the second power supply 2 to supply power to the load circuit 4 when the first power supply 1 and the second power supply 2 are in a starting state.

Fig. 2 is a schematic diagram of a first switch function circuit according to the present application. As shown in fig. 2, the first switching function circuit 31 includes a first switching unit 311, a second switching unit 312, and a third switching unit 313. The first end of the first switch unit 311 is connected to the first end of the second switch unit 312, the second end of the first switch unit 311 is connected to the second end of the second switch unit 312, the third end of the second switch unit 312 is connected to the first end of the third switch unit 313, the end formed by connecting the first end of the first switch unit 311 and the first end of the second switch unit 312 is the first end of the first switch function circuit 31, the second end of the third switch unit 313 is the second end of the first switch function circuit 31, and the third end of the first switch unit 311 is the third end of the first switch function circuit 31.

When the first power source 1 is in the on state and the second power source 2 is in the off state, the third switching unit 313 is in the non-conductive state. At this time, the third switching unit 313 in the non-conductive state is used to control the first switching unit 311 and the second switching unit 312 to be in the conductive state, and the first switching unit 311 and the second switching unit 312 in the conductive state are used to transmit the first power voltage provided by the first power source 1 to the load circuit 4. It should be understood that, when the first power source 1 is in the on state and the second power source 2 is in the off state, the first switch unit 311 and the second switch unit 312 are used to transmit the first power voltage provided by the first power source 1 to the load circuit 4 to supply power to the load circuit 4.

When the second power supply 2 is in the start-up state and the first power supply 1 is in the start-up state, the third switching unit 313 is in the on state. At this time, the third switching unit 313 in the conductive state is used to control the first switching unit 311 and the second switching unit 312 to be in the non-conductive state, and the first switching unit 311 and the second switching unit 312 in the non-conductive state are used to prevent the first power voltage provided by the first power source 1 from being transmitted to the load circuit 4. It should be appreciated that when both the first power source 1 and the second power source 2 are in the activated state, the third switching unit 313 is in the conductive state, and the first switching unit 311 and the second switching unit 312 are in the non-conductive state, so that the circuit path between the first power source 1 and the load circuit 4 is disconnected, and the first switching unit 311 and the second switching unit 312 no longer transmit the first power source voltage provided by the first power source 1 to the load circuit 4.

It can be understood that, according to the working states of the first power supply 1 and the second power supply 2, the conducting states of the first switch unit 311, the second switch unit 312 and the third switch unit 313 can be controlled, so as to further control the conduction of the circuit path between the first power supply 1 and the load circuit 4, thereby controlling the first power supply 1 to supply power to the load circuit 4, and the switching of multiple power supplies can be realized from the hardware perspective, without the intervention of software, and the reliability and the applicability are high.

Fig. 3 is another schematic diagram of the first switch function circuit provided by the present application. As shown in fig. 3, the first switching unit 311 includes a first resistor R1 and a first transistor Q1. The first end of the first resistor R1 is connected to the first end of the first transistor Q1, the second end of the first resistor R1 is connected to the second end of the first transistor Q1, the end formed by connecting the first end of the first resistor R1 and the first end of the first transistor Q1 is the first end of the first switch unit 311, the end formed by connecting the second end of the first resistor R1 and the second end of the first transistor Q1 is the third end of the first switch unit 311, and the third end of the first transistor Q1 is the second end of the first switch unit 311.

The second switching unit 312 includes a second resistor R2, a third resistor R3, a fourth resistor R4, and a second transistor Q2, where a first end of the second resistor R2 is connected to a first end of the third resistor R3, a second end of the third resistor R3 is connected to a first end of the fourth resistor R4, a first end of the second transistor Q2 is grounded, a second end of the fourth resistor R4 is connected to a second end of the second transistor Q2, a second end of the second resistor R2 is a first end of the second switching unit 312, a second end of the second switching unit 312 is a second end of the second switching unit 2 formed by connecting the first end of the second resistor R2 to the first end of the third resistor R3, and a third end of the second transistor Q2 is a third end of the second switching unit 312.

The third switching unit 313 includes a fifth resistor R5, a sixth resistor R6, and a third transistor Q3, where a first end of the fifth resistor R5 is connected to a first end of the third transistor Q3 and a first end of the sixth resistor R6, a second end of the sixth resistor is grounded to a second end of the third transistor Q3, a second end of the fifth resistor R5 is a first end of the third switching unit 313, and a third end of the third transistor Q3 is a second end of the third switching unit 313.

In one embodiment, the first transistor Q1, the second transistor Q2, and the third transistor Q3 may be one of a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) and an insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT), where the Metal-Oxide-semiconductor transistor may be simply referred to as a MOS transistor. Illustratively, the first transistor Q1 may be a PMOS transistor, the second transistor Q2 may be an NMOS transistor, and the third transistor Q3 may be an NMOS transistor.

In one embodiment, when the first power source 1 is in the on state and the second power source 2 is in the off state, the sixth resistor R6 is used to control the third transistor Q3 to be in the non-conductive state, and the third transistor Q3, the second resistor R2, the third resistor R3, and the fourth resistor R4 in the non-conductive state are used to control the first transistor Q1 and the second transistor Q2 to be in the conductive state. When the second power supply 2 is in the start-up state, the fifth resistor R5 and the sixth resistor R6 are used for controlling the third transistor Q3 to be in the conductive state, the third transistor Q3 in the conductive state is used for controlling the second transistor Q2 to be in the non-conductive state, and the second transistor Q2 and the first resistor R1 in the non-conductive state are used for controlling the first transistor Q1 to be in the non-conductive state.

The third transistor Q3 may be an NMOS transistor, the first end of the third transistor Q3 is a gate, the second end of the third transistor Q3 is a source, the third end of the third transistor Q3 is a drain, the first end of the sixth resistor R6 is connected to the gate of the third transistor Q3, the second end of the sixth resistor R6 is grounded to the source of the third transistor Q3, and at this time, the voltage difference between the gate and the source of the third transistor Q3 is equal to the voltage value of the sixth resistor R6. It should be understood that the fifth resistor R5 and the sixth resistor R6 may form a resistor divider, and by setting the resistance values of the fifth resistor R5 and the sixth resistor R6, for example, setting the resistance value of the sixth resistor R6 to be greater than the resistance value of the fifth resistor R5, the divided value of the sixth resistor R6 may be adjusted, so as to adjust the voltage difference between the gate and the source of the third transistor Q3, and when the voltage difference between the gate and the source of the third transistor Q3 is greater than the turn-on voltage threshold of the third transistor Q3, the third transistor Q3 is in the on state, and at this time, the third switch unit 313 is in the on state.

Similarly, the second transistor Q2 may be an NMOS transistor, the first end of the second transistor Q2 is a gate, the second end of the second transistor Q2 is a source, the third end of the second transistor Q2 is a drain, the first end of the fourth resistor R4 is connected to the gate of the second transistor Q2, the second end of the fourth resistor R4 is grounded to the source of the second transistor Q2, and at this time, the voltage difference between the gate and the source of the second transistor Q2 is equal to the voltage value of the fourth resistor R4. It should be understood that the second resistor R2, the third resistor R3 and the fourth resistor R4 may form a resistor divider, and by setting the resistance values of the third resistor R3 and the fourth resistor R4, for example, setting the resistance value of the fourth resistor R4 to be greater than the resistance value of the second resistor R2 and the resistance value of the third resistor R3, the voltage division value of the fourth resistor R4 may be adjusted, so as to adjust the voltage difference between the gate and the source of the second transistor Q2, and when the voltage difference between the gate and the source of the second transistor Q2 is greater than the threshold of the turn-on voltage of the second transistor Q2, the second transistor Q2 is in the turned-on state and the second switch unit 312 is in the turned-on state.

Similarly, the first transistor Q1 may be a PMOS transistor, where the first end of the first transistor Q1 is a source, the second end of the first transistor Q1 is a gate, the third end of the first transistor Q1 is a drain, the first end of the first resistor R1 is connected to the source of the first transistor Q1, and the end formed by connecting the second end of the first resistor R1 to the gate of the first transistor Q1 is connected to the drain of the second transistor Q2. When the second transistor Q2 is in the on state, the gate of the first transistor Q1 is grounded through the second transistor Q2, and at this time, the voltage difference between the gate and the source of the first transistor Q1 is equal to the voltage value of the first resistor R1. It should be understood that by setting the resistance value of the first resistor R1, the voltage difference between the gate and the source of the first transistor Q1 may be adjusted, and when the voltage difference between the gate and the source of the first transistor Q1 is greater than the threshold of the on voltage of the first transistor Q1, the first transistor Q1 is in the on state, and at this time, the first switch unit 311 is in the on state.

In one embodiment, when the first power source 1 is in the on state and the second power source 2 is in the off state, since the second power source 2 is in the off state, the gate of the third transistor Q3 is grounded through the sixth resistor R6, and the source of the third transistor Q3 is also grounded, at this time, the voltage of the gate and the voltage of the source of the third transistor Q3 are equal, the voltage difference between the gate and the source of the third transistor Q3 is smaller than the threshold of the turn-on voltage of the third transistor Q3, and the third transistor Q3 is in the non-turn-on state. Further, since the first power supply 1 is in the start state, the resistor divider composed of the second resistor R2, the third resistor R3 and the fourth resistor R4 divides the first power supply voltage provided by the first power supply 1, so that the resistance value of the fourth resistor R4 is greater than the resistance values of the second resistor R2 and the third resistor R3. Further, by adjusting the resistance values of the second resistor R2, the third resistor R3 and the fourth resistor R4, the voltage of the gate electrode of the second transistor Q2 is set to be equal to the divided voltage value of the fourth resistor R4, and the source electrode of the second transistor Q2 is grounded, so that the voltage difference between the gate electrode and the source electrode of the second transistor Q2 is equal to the divided voltage value of the fourth resistor R4, and when the divided voltage value of the fourth resistor R4 (i.e., the voltage difference between the gate electrode and the source electrode of the second transistor Q2) is greater than the on voltage threshold of the second transistor Q2, the second transistor Q2 is in an on state. Further, when the second transistor Q2 is in the on state, the first transistor Q1 is grounded through the second transistor Q2, the first end of the first resistor R1 is connected to the first end of the first transistor Q1, and the voltage difference between the gate and the source of the first transistor Q1 is equal to the voltage division value of the first resistor R1. By adjusting the resistance value of the first resistor R1, the voltage difference between the gate and the source of the first transistor Q1 is greater than the on-voltage threshold of the first transistor Q1, so that the first transistor Q1 is in an on state. When the third transistor Q3 is in the on state, the first transistor Q1 is in the on state, and the second transistor Q2 is in the on state, the circuit path between the first power supply 1 and the load circuit 4 is turned on, that is, the first switching unit 311 is in the on state, and the first switching unit 311 in the on state transmits the first power supply voltage provided by the first power supply 1 to the load circuit 4.

In one embodiment, when the second power supply 2 is in the start-up state, the fifth resistor R5 and the sixth resistor R6 divide the second power supply voltage provided by the second power supply 2, so that the resistance value of the sixth resistor R6 is greater than the resistance value of the fifth resistor R5. Further, by adjusting the resistance values of the fifth resistor R5 and the sixth resistor R6, the voltage of the gate electrode of the third transistor Q3 is set to be equal to the divided voltage value of the sixth resistor R6, and the source electrode of the third transistor Q3 is grounded, so that the voltage difference between the gate electrode and the source electrode of the third transistor Q3 is equal to the divided voltage value of the sixth resistor R6, and when the divided voltage value of the sixth resistor R6 (i.e., the voltage difference between the gate electrode and the source electrode of the third transistor Q3) is greater than the on-voltage threshold of the third transistor Q3, the third transistor Q3 is in an on state. Further, when the third transistor Q3 is in the on state, the gate of the second transistor Q2 is grounded through the third resistor R3 and the third transistor Q3, and the source of the second transistor Q2 is also grounded. Therefore, when the voltage difference between the gate and the source of the second transistor Q2 is equal, that is, the voltage difference between the gate and the source of the second transistor Q2 is smaller than the threshold of the turn-on voltage of the second transistor Q2, the second transistor Q2 is in a non-turned-on state.

When the first power supply 1 is in the on state or the first power supply 1 is in the off state, since the first end of the first resistor R1 is connected to the source of the first transistor Q1 and the second end of the first resistor R1 is connected to the gate of the first transistor Q1, the voltages of the source and the gate of the first transistor Q1 are equal, that is, the voltage difference between the gate and the source of the first transistor Q1 is less than the threshold of the turn-on voltage of the first transistor Q1, and the first transistor Q1 is in the non-turn-on state. At this time, the circuit path between the first power supply 1 and the load circuit 4 is opened, and the first switching unit 311 no longer transmits the first power supply voltage provided by the first power supply 1 to the load circuit 4.

It can be understood that when the first power supply 1 is in the on state and the second power supply 2 is in the off state, the third transistor Q3 is in the non-conducting state, and the second transistor Q2 is in the conducting state through the resistor divider formed by the second resistor R2, the third resistor R3 and the fourth resistor R4, so that the first transistor Q1 is controlled to be in the conducting state through the first resistor R1, and the first power supply voltage provided by the first power supply 1 is transmitted to the load circuit 4 by the first transistor Q1 and the second transistor Q2 in the conducting state. Therefore, the second resistor R2, the third resistor R3 and the fourth resistor R4 are used for controlling the second transistor Q2 to be in a conducting state, the first resistor R1 is used for controlling the first transistor Q1 to be in a conducting state, and the first power supply 1 can be controlled from a hardware angle to supply power to the load circuit 4, so that switching of a plurality of power supplies is realized, software intervention is not needed, reliability is high, and applicability is strong. In addition, the switching of a plurality of power supplies is realized by introducing the combination of the NMOS tube and the PMOS tube, so that the voltage loss on a power supply channel is reduced, and the introduced NMOS tube and the PMOS tube greatly reduce the conduction voltage drop, so that the reduction of the first power supply voltage is reduced.

Fig. 4 is a schematic structural diagram of a second switch function circuit provided by the present application. As shown in fig. 4, the second switching function circuit 32 includes a fourth switching unit 321 and a fifth switching unit 322. The first end of the fourth switch unit 321 is connected to the first end of the fifth switch unit 322, the second end of the fourth switch unit 321 is connected to the second end of the fifth switch unit 322, the end formed by connecting the first end of the fourth switch unit 321 and the first end of the fifth switch unit 322 is the first end of the second switch function circuit 32, and the third end of the fourth switch unit 321 is the second end of the second switch function circuit 32.

When the second power supply 2 is in the start-up state, the fifth switching unit 322 is in the on state. It should be understood that the second power supply 2 being in the activated state includes a case where the first power supply 1 and the second power supply 2 are both in the activated state, and a case where the first power supply 1 is in the off state and the second power supply 2 is in the activated state. At this time, the fifth switching unit 322 in the on state is used for controlling the fourth switching unit 321 to be in the on state, and the fourth switching unit 321 in the on state is used for transmitting the second power voltage provided by the second power source 2 to the load circuit 4. It should be understood that when the second power supply 2 is in the start-up state, the fourth switching unit 321 and the fifth switching unit 322 are in the on state, so that the circuit path between the second power supply 2 and the load circuit 4 is on, and the fourth switching unit 321 and the fifth switching unit 322 transmit the second power supply voltage provided by the second power supply 2 to the load circuit 4 to supply power to the load circuit 4.

It can be understood that according to the working states of the first power supply 1 and the second power supply 2, the conducting states of the fourth switch unit 321 and the fifth switch unit 322 can be controlled, and then the circuit path between the second power supply 2 and the load circuit 4 is controlled to be conducted, so that the second power supply 2 is controlled to supply power to the load circuit 4, the switching of multiple power supplies can be realized from the hardware angle, the intervention of software is not needed, the reliability is high, and the applicability is strong.

Fig. 5 is another schematic diagram of a second switch function circuit according to the present application. As shown in fig. 5, the fourth switching unit 321 includes a seventh resistor R7 and a fourth transistor Q4, a first end of the seventh resistor R7 is connected to the first end of the fourth transistor Q4, a second end of the seventh resistor R7 is connected to the second end of the fourth transistor Q4, an end formed by connecting the first end of the seventh resistor R7 and the first end of the fourth transistor Q4 is a first end of the fourth switching unit 321, an end formed by connecting the second end of the seventh resistor R7 and the second end of the fourth transistor Q4 is a second end of the fourth switching unit 321, and a third end of the fourth switching unit 321 is a third end of the fourth transistor Q4.

The fifth switching unit 322 includes an eighth resistor R8, a ninth resistor R9, and a fifth transistor Q5, where a first end of the eighth resistor R8 is connected to a first end of the ninth resistor R9 and a first end of the fifth transistor Q5, a second end of the ninth resistor R9 is grounded to a second end of the fifth transistor Q5, a second end of the eighth resistor R8 is a first end of the fifth switching unit 322, and a third end of the fifth transistor Q5 is a second end of the fifth switching unit 322. The fourth transistor Q4 may be a PMOS transistor and the fifth transistor Q5 may be an NMOS transistor, for example.

When the second power supply 2 is in the start-up state, the eighth resistor R8 and the ninth resistor R9 are used for controlling the fifth transistor Q5 to be in the on state, the fifth transistor Q5 in the on state is used for controlling the fourth transistor Q4 to be in the on state, and the fourth transistor Q4 and the seventh resistor R7 in the on state are used for controlling the fourth transistor Q4 to be in the on state.

In one embodiment, when the second power supply 2 is in the on state, that is, when the first power supply 1 and the second power supply 2 are both in the on state, or the first power supply 1 is in the off state, the fifth resistor R5 and the sixth resistor R6 are used to control the third transistor Q3 to be in the on state, so that the third switching unit 313 is in the on state. The third transistor Q3 in a conductive state is used to control the first and second switching units 311 and 312 to be in a non-conductive state. The eighth resistor R8 and the ninth resistor R9 are used for controlling the fifth transistor Q5 to be in a conducting state, the fifth transistor Q5 which makes the fifth switching unit 322 be in a conducting state, and the seventh resistor R7 is used for controlling the fourth transistor Q4 to be in a conducting state, and the fourth switching unit 321 to be in a conducting state.

The fifth transistor Q5 may be an NMOS transistor, the first end of the fifth transistor Q5 is a gate, the second end of the fifth transistor Q5 is a source, the third end of the fifth transistor Q5 is a drain, the first end of the ninth resistor R9 is connected to the gate of the fifth transistor Q5, the second end of the ninth resistor R9 is grounded to the source of the fifth transistor Q5, and at this time, the voltage difference between the gate and the source of the fifth transistor Q5 is equal to the voltage value of the ninth resistor R9. It should be understood that the eighth resistor R8 and the ninth resistor R9 may form a resistor divider, and by setting the resistance values of the eighth resistor R8 and the ninth resistor R9, for example, setting the resistance value of the ninth resistor R9 to be greater than the resistance value of the eighth resistor R8, the voltage division value of the ninth resistor R9 may be adjusted, so as to adjust the voltage difference between the gate and the source of the fifth transistor Q5, and when the voltage difference between the gate and the source of the fifth transistor Q5 is greater than the threshold of the turn-on voltage of the fifth transistor Q5, the fifth transistor Q5 is in the on state, and at this time, the fifth switch unit 322 is in the on state.

Similarly, the fourth transistor Q4 may be a PMOS transistor, the first end of the fourth transistor Q4 is a source, the second end of the fourth transistor Q4 is a gate, the third end of the fourth transistor Q4 is a drain, the first end of the seventh resistor R7 is connected to the source of the fourth transistor Q4, the second end of the seventh resistor R7 is grounded to the gate of the fourth transistor Q4, and at this time, the voltage difference between the gate and the source of the fourth transistor Q4 is equal to the voltage value of the seventh resistor R7. When the fifth transistor Q5 is in the on state, the gate of the fourth transistor Q4 is grounded through the fifth transistor Q5, and at this time, the voltage difference between the gate and the source of the fourth transistor Q4 is equal to the voltage value of the seventh resistor R7. It should be understood that, by setting the resistance value of the seventh resistor R7, the voltage difference between the gate and the source of the fourth transistor Q4 may be adjusted, and when the voltage difference between the gate and the source of the fourth transistor Q4 is greater than the threshold of the turn-on voltage of the fourth transistor Q4, the fourth transistor Q4 is in the on state, and at this time, the fourth switch unit 321 is in the on state.

It can be understood that when the second power supply 2 is in the start-up state, that is, when the first power supply 1 and the second power supply 2 are both in the start-up state, or the first power supply 1 is in the off state, when the second power supply 2 is in the start-up state, the third transistor Q3 can be controlled to be in the on state through the fifth resistor R5 and the sixth resistor R6, and then the first transistor Q1 and the second transistor Q2 are controlled to be in the non-on state, so that the circuit path between the first power supply 1 and the load circuit 4 is disconnected, and therefore, when the first power supply 1 and the second power supply 2 are both in the start-up state, the second power supply 2 is preferably selected to supply power to the load circuit 4, and software intervention is not needed, so that the reliability is high, and the applicability is strong.

Fig. 6 is a schematic structural diagram of a third switch function circuit provided by the present application. As shown in fig. 6, the above-described power supply conversion circuit system 3 further includes a third switching function circuit 33. The second end of the first power supply 1 is connected to the first end of the third switch function circuit 33, the second end of the second power supply 2 is connected to the second end of the third switch function circuit 33, the third end of the first switch function circuit 31 and the second end of the second switch function circuit 32 are both connected to the third end of the third switch function circuit 33, and the fourth end of the third switch function circuit 33 is connected to the load circuit 4. It will be appreciated that the second terminal of the first power supply 1 is arranged to transmit a first power supply voltage provided by the first power supply to the third switching function circuit 33. It will be appreciated that the second terminal of the second power supply 2 is used to transmit the second power supply voltage to the third switching function 33.

When the first power supply 1 is in the on state and the second power supply 2 is in the off state, the third switch function circuit 33 is in the on state, and the third switch function circuit 33 in the on state, the first switch function circuit 31 in the on state, and the first power supply 1 constitute a first power supply circuit to transmit a first power supply voltage provided by the first power supply 1 to the load circuit 4.

When the second power supply 2 is in the start-up state, the third switch function circuit 33 is in the on state, and the third switch function circuit 33 in the on state, the second switch function circuit 32 in the on state, and the second power supply 2 constitute a second power supply circuit to transmit the second power supply voltage provided by the second power supply 2 to the load circuit 4.

It will be appreciated that the third switching function circuit 33 in the on state is arranged to transmit either the first supply voltage provided by the first power supply 1 or the second supply voltage provided by the second power supply 2 to the load circuit 4. When the third switch function circuit 33 is in the non-conductive state, the third switch function circuit 33 does not transmit the first power voltage provided by the first power source 1 or the second power voltage provided by the second power source 2 to the load circuit 4, and meanwhile, the residual voltage of the load circuit 4 when the first power source 1 and the second power source 2 are in the off state is prevented from being transmitted to the first switch function circuit 31 or the second switch function circuit 32 in the front-stage circuit through the third switch function circuit 33, so that the safety of the power supply conversion circuit system 3 is improved, and the potential safety hazard of the power supply conversion circuit system 3 is reduced.

Fig. 7 is another schematic structural diagram of the third switch function circuit provided by the present application. As shown in fig. 7, the third switching function circuit 33 includes a first diode D1, a second diode D2, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a sixth transistor Q6, and a seventh transistor Q7. The first end of the first diode D1 and the first end of the second diode D2 are connected to the first end of the tenth resistor R10, the second end of the tenth resistor R10 is connected to the first end of the eleventh resistor R11 and the first end of the sixth transistor Q6, the second end of the sixth transistor Q6 is connected to the first end of the twelfth resistor R12 and the first end of the seventh transistor Q7, the second end of the seventh transistor Q7 is connected to the second end of the twelfth resistor R12, the second end of the eleventh resistor R11 is grounded to the third end of the sixth resistor Q6, the second end of the first diode D1 is the first end of the third switch function circuit 33, the second end of the second diode D2 is the second end of the third switch function circuit 33, the third end of the seventh transistor Q7 is the third end of the third switch function circuit 33, and the end formed by connecting the second end of the seventh transistor Q7 and the second end of the twelfth resistor R12 is the fourth end of the third switch function circuit 33.

It will be appreciated that when both the first power supply 1 and the second power supply 2 are in the start-up state, the first diode D1 is used to prevent the first power supply voltage provided by the first power supply 1 from being transmitted to the second power supply 2, and the second diode D2 is used to prevent the second power supply voltage provided by the second power supply 2 from being transmitted to the first power supply 1. In addition, when the first power supply 1 and the second power supply 2 are both in the off state, the seventh transistor Q7 is used to prevent the residual voltage of the load circuit 4 from being transmitted to the first switch function circuit 31 or the second switch function circuit 32 in the pre-stage circuit, thereby improving the safety of the power supply conversion circuit system 3 and reducing the potential safety hazard of the power supply conversion circuit system 3.

Illustratively, the sixth transistor Q6 may be an NMOS transistor, and the seventh transistor Q7 may be a PMOS transistor.

In one embodiment, when the first power supply 1 is in the on state and the second power supply 2 is in the off state, the first power supply 1 supplies the first power supply voltage to the third switch function circuit 33, the eleventh resistor R11 is used to control the sixth transistor Q6 to be in the on state, the sixth transistor Q6 in the on state is used to control the seventh transistor Q7 to be in the on state, and the twelfth resistor R12 is used to prevent the seventh transistor Q7 from being in the on state when the first power supply 1 is in the off state.

In particular, when the first power source 1 is in the on state and the second power source 2 is in the off state, the third switch unit 313 is in the non-conducting state, and the first switch unit 311 and the second switch unit 312 are both in the conducting state, at this time, the first power source 1 provides the first power source voltage to the third switch function circuit 33. Further, the eleventh resistor R11 is used for controlling the sixth transistor Q6 to be in an on state, and the gate of the seventh transistor Q7 is grounded via the sixth transistor Q6. The cathode of the body diode in the seventh transistor Q7 is connected to the twelfth resistor R12, and the anode of the body diode in the seventh transistor Q7 is connected to the drain of the seventh transistor Q7, i.e. the first power supply 1 supplies power to the twelfth resistor R12 via the body diode in the seventh transistor Q7. At this time, the voltage of the source of the seventh transistor Q7 is equal to the first power supply voltage supplied by the first power supply 1. When the voltage difference between the gate and the source of the seventh transistor Q7 is greater than the threshold of the turn-on voltage of the seventh transistor Q7, the seventh transistor Q7 is in the on state, so as to realize that the first power supply 1 provides the first power supply voltage to the load circuit 4. Due to the body diode in the seventh transistor Q7, when the first power supply 1 is in the off state, the residual voltage in the load circuit 4 is no longer transmitted to the first power supply 1 through the seventh transistor Q7, thereby effectively preventing the load circuit 4 from flowing backward toward the front stage circuit (i.e., the first switching function circuit 31).

In one embodiment, when the first power supply 1 is in the off state and the second power supply 2 is in the on state, the second power supply 2 supplies the second power supply voltage to the third switch function circuit 33, the eleventh resistor R11 is used to control the sixth transistor Q6 to be in the on state, the sixth transistor Q6 in the on state is used to control the seventh transistor Q7 to be in the on state, and the twelfth resistor R12 is used to prevent the seventh transistor Q7 from being in the on state when the second power supply 2 is in the off state.

In particular, when the first power source 1 is in the off state and the second power source 2 is in the on state, the third switch unit 313 is in the non-conducting state, and the first switch unit 311 and the second switch unit 312 are both in the conducting state, at this time, the second power source 2 provides the second power source voltage to the third switch function circuit 33. Further, the eleventh resistor R11 is used for controlling the sixth transistor Q6 to be in an on state, and the gate of the seventh transistor Q7 is grounded via the sixth transistor Q6. The cathode of the body diode in the seventh transistor Q7 is connected to the twelfth resistor R12, and the anode of the body diode in the seventh transistor Q7 is connected to the drain of the seventh transistor Q7, i.e. the second power supply 2 supplies power to the twelfth resistor R12 via the body diode in the seventh transistor Q7. At this time, the voltage of the source of the seventh transistor Q7 is equal to the second power supply voltage supplied from the second power supply 2. When the voltage difference between the gate and the source of the seventh transistor Q7 is greater than the threshold of the turn-on voltage of the seventh transistor Q7, the seventh transistor Q7 is in the on state, so as to realize that the second power supply 2 provides the second power supply voltage to the load circuit 4. Due to the body diode in the seventh transistor Q7, when the second power supply 2 is in the off state, the residual voltage in the load circuit 4 is no longer transferred to the second power supply 2 through the seventh transistor Q7, thereby effectively preventing the load circuit 4 from flowing backward toward the front stage circuit (i.e., the second switching function circuit 32).

In one embodiment, when the first power source 1 and the second power source 2 are both in the on state and the first power source voltage provided by the first power source 1 is greater than the second power source voltage provided by the second power source 2, the first diode D1 is used to transmit the first power source voltage to the components except the first diode D1 and the second diode D2 in the third switch function circuit 33, so as to control the sixth transistor Q6 and the seventh transistor Q7 to be in the on state. The second diode D2 is used to prevent the first power voltage from being transmitted to the second power 2.

When both the first power supply 1 and the second power supply 2 are in the start-up state, and the first power supply voltage provided by the first power supply 1 is greater than the second power supply voltage provided by the second power supply 2, the first power supply voltage provided by the first power supply 1 is transmitted to the sixth transistor Q6 through the first diode D1 and the tenth resistor R10, so as to control the sixth transistor Q6 to be in the on state.

Specifically, the sixth transistor Q6 may be an NMOS transistor, the first end of the sixth transistor Q6 is a gate, the second end of the sixth transistor Q6 is a drain, the third end of the sixth transistor Q6 is a source, the first end of the eleventh resistor R11 is connected to the gate of the sixth transistor Q6, the second end of the eleventh resistor R11 is grounded to the source of the sixth transistor Q6, and at this time, the voltage difference between the gate and the source of the sixth transistor Q6 is equal to the voltage value of the eleventh resistor R11. It should be understood that the tenth resistor R10 and the eleventh resistor R11 may form a resistor divider, and by setting the resistance values of the tenth resistor R10 and the eleventh resistor R11, for example, setting the resistance value of the eleventh resistor R11 to be greater than the resistance value of the tenth resistor R10, the voltage division value of the eleventh resistor R11 may be adjusted, so as to adjust the voltage difference between the gate and the source of the sixth transistor Q6, and when the voltage difference between the gate and the source of the sixth transistor Q6 is greater than the on voltage threshold of the sixth transistor Q6, the sixth transistor Q6 is in the on state.

Further, the seventh transistor Q7 may be a PMOS transistor, the first end of the seventh transistor Q7 is a gate, the second end of the seventh transistor Q7 is a source, the third end of the seventh transistor Q7 is a drain, the first end of the twelfth resistor R12 is connected to the gate of the seventh transistor Q7, and the end formed by connecting the second end of the twelfth resistor R12 to the source of the seventh transistor Q7 is connected to the load circuit 4. It should be understood that, as shown in fig. 7, when both the first power supply 1 and the second power supply 2 are in the on state, since the third transistor Q3 is in the on state, and thus the first transistor Q1 and the second transistor Q2 are controlled to be in the non-on state, the circuit path between the first power supply 1 and the load circuit 4 is disconnected, so that the second power supply voltage provided by the second power supply 2 can supply power to the second resistor R2 through the body diode in the seventh transistor Q7. At this time, the voltage of the source of the seventh transistor Q7 is equal to the second power supply voltage supplied from the second power supply 2. When the sixth transistor Q6 is in the on state, the gate of the seventh transistor Q7 is grounded through the sixth transistor Q6, and at this time, the voltage difference between the gate and the source of the seventh transistor Q7 is greater than the threshold of the on voltage of the seventh transistor Q7, that is, the seventh transistor Q7 is in the on state. It should be appreciated that the second resistor R2 is used to prevent the seventh transistor Q7 from being in the on state when the first power source 1 and the second power source 2 are in the off state, that is, the second resistor R2 is used to keep the gate of the seventh transistor Q7 and the source of the seventh transistor Q7 at the same level, which may prevent the voltage difference between the gate and the source of the seventh transistor Q7 from being greater than the on voltage threshold of the seventh transistor Q7, thereby preventing the seventh transistor Q7 from being in the on state. Since the first power source 1 and the second power source 2 are both in the start-up state, at this time, the third switch function circuit 33 is in the on state, the second switch function circuit 32 in the on state and the second power source 2 form a second power supply circuit, and the second power supply voltage provided by the second power source 2 is transmitted to the load circuit 4.

In one embodiment, when the first power source 1 and the second power source 2 are both in the on state, and the second power source 2 provides the second power source voltage greater than the first power source voltage provided by the first power source 1, the second diode D2 is used to transmit the second power source voltage to the components except the first diode D1 and the second diode D2 in the third switch function circuit 33, so as to control the sixth transistor Q6 and the seventh transistor Q7 to be in the on state. The first diode D1 is used to prevent the second power voltage from being transmitted to the first power 1.

When both the first power source 1 and the second power source 2 are in the start-up state, and the second power source 2 provides a second power source voltage greater than the first power source voltage provided by the first power source 1, the second power source voltage provided by the second power source 2 is transmitted to the sixth transistor Q6 through the second diode D2 and the tenth resistor R10 to control the sixth transistor Q6 to be in the on state. Further, by setting the resistance values of the tenth resistor R10 and the eleventh resistor R11, the voltage difference between the gate and the source of the sixth transistor Q6 is adjusted, and the sixth transistor Q6 is turned on. Further, since the gate of the seventh transistor Q7 is grounded via the sixth transistor Q6, the voltage of the source of the seventh transistor Q7 is equal to the second power voltage provided by the second power source 2, and thus the voltage difference between the gate and the source of the seventh transistor Q7 is greater than the threshold of the turn-on voltage of the seventh transistor Q7, and the seventh transistor Q7 is in the turned-on state. Since the first power source 1 and the second power source 2 are both in the start-up state, at this time, the third switch function circuit 33 is in the on state, the second switch function circuit 32 in the on state and the second power source 2 form a second power supply circuit, and the second power supply voltage provided by the second power source 2 is transmitted to the load circuit 4.

It can be understood that the first switch function circuit 31 and the second switch function circuit 32 in the power supply conversion circuit system 3 provided by the application can realize switching of multiple power supplies, can realize that a single power supply supplies power to the load circuit 4 when in a starting state (i.e. the first power supply 1 or the second power supply 2 is in a starting state), and can preferentially enable the second power supply 2 to supply power to the load circuit 4 when both the first power supply 1 and the second power supply 2 are in a starting state. In addition, the switching of a plurality of power supplies is realized by introducing the combination of the NMOS tube and the PMOS tube, so that the voltage loss on a power supply channel is reduced, and the introduced NMOS tube and the PMOS tube greatly reduce the conduction voltage drop, so that the voltage drop of the first power supply 1 or the voltage drop of the second power supply 2 is reduced. In addition, when the first power supply 1 and the second power supply 2 are both in the off state, the third switch function circuit 33 may be used to prevent the voltage of the load circuit 4 from being transmitted to the first switch function circuit 31 or the second switch function circuit 32 in the previous stage circuit, thereby improving the safety of the power supply conversion circuit system 3 and reducing the potential safety hazard of the power supply conversion circuit system 3.

Fig. 8 is a schematic structural diagram of an electronic device provided by the present application. As shown in fig. 8, the electronic device includes the above-described power supply conversion circuit system 3, and the power supply conversion circuit system 3 is connected to the first power supply 1, the second power supply 2, and the load circuit 4. The first power supply 1 and the second power supply 2 are used for supplying power to the power supply conversion circuit system 3, so that the power supply conversion circuit system 3 can realize switching of multiple power supplies and supply power to the load circuit 4, switching of the multiple power supplies is realized from a hardware angle, software intervention is not needed, and the reliability and the applicability are high.

Fig. 9 is a schematic structural diagram of a power supply conversion device provided by the application. As shown in fig. 9, the power supply conversion device includes the power supply conversion circuit system 3, and the power supply conversion circuit system 3 is connected to the first power supply 1, the second power supply 2, and the load circuit 4. The first power supply 1 and the second power supply 2 are used for supplying power to the power supply conversion circuit system 3, so that the power supply conversion circuit system 3 can realize switching of multiple power supplies and supply power to the load circuit 4, switching of the multiple power supplies is realized from a hardware angle, software intervention is not needed, and the reliability and the applicability are high.

It should be noted that the above-described terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. It will be understood that the examples corresponding to fig. 3 to 7 are only for explaining the embodiments of the present application, and should not be construed as limiting, and that in alternative implementations, fig. 3 to 7 may also have other implementations, for example, the transistors in fig. 7 may be replaced by transistors, etc., which are not listed here.

The foregoing disclosure is illustrative of the present utility model and is not to be construed as limiting the scope of the utility model, which is defined by the appended claims.

Claims

1. A power conversion circuitry, wherein the power conversion circuitry comprises a first switch function circuit and a second switch function circuit;

A first end of a first power supply is connected with a first end of the first switch function circuit, a first end of a second power supply is connected with a second end of the first switch function circuit and a first end of the second switch function circuit, and a third end of the first switch function circuit is connected with a second end of the second switch function circuit;

When the first power supply is in a starting state and the second power supply is in a closing state, the first switch function circuit is in a conducting state, the second switch function circuit is in a non-conducting state, and the first switch function circuit in the conducting state is used for transmitting a first power supply voltage provided by the first power supply to a load circuit;

When the second power supply is in a starting state, the first switch function circuit is in a non-conducting state, the second switch function circuit is in a conducting state, and the second switch function circuit in the conducting state is used for transmitting a second power supply voltage provided by the second power supply to the load circuit.

2. The power conversion circuitry of claim 1, wherein the first switching function circuit comprises a first switching unit, a second switching unit, and a third switching unit;

The first end of the first switch unit is connected with the first end of the second switch unit, the second end of the first switch unit is connected with the second end of the second switch unit, the third end of the second switch unit is connected with the first end of the third switch unit, the end formed by connecting the first end of the first switch unit with the first end of the second switch unit is the first end of the first switch function circuit, the second end of the third switch unit is the second end of the first switch function circuit, and the third end of the first switch unit is the third end of the first switch function circuit;

When the first power supply is in a starting state and the second power supply is in a closing state, the third switch unit is in a non-conducting state; the third switch unit in a non-conducting state is used for controlling the first switch unit and the second switch unit to be in a conducting state, and the first switch unit and the second switch unit in the conducting state are used for transmitting a first power supply voltage provided by the first power supply to the load circuit;

when the second power supply is in a starting state and the first power supply is in a starting state, the third switch unit is in a conducting state; the third switch unit in a conducting state is used for controlling the first switch unit and the second switch unit to be in a non-conducting state, and the first switch unit and the second switch unit in the non-conducting state are used for preventing the first power supply voltage provided by the first power supply from being transmitted to the load circuit.

3. The power conversion circuit system according to claim 2, wherein the first switch unit includes a first resistor and a first transistor, a first end of the first resistor is connected to a first end of the first transistor, a second end of the first resistor is connected to a second end of the first transistor, an end formed by the first end of the first resistor and the first end of the first transistor after connection is the first end of the first switch unit, an end formed by the second end of the first resistor and the second end of the first transistor after connection is the third end of the first switch unit, and the third end of the first transistor is the second end of the first switch unit;

The second switch unit comprises a second resistor, a third resistor, a fourth resistor and a second transistor, wherein the first end of the second resistor is connected with the first end of the third resistor, the second end of the third resistor is connected with the first end of the fourth resistor and the first end of the second transistor, the second end of the fourth resistor is grounded with the second end of the second transistor, the second end of the second resistor is the first end of the second switch unit, the end formed by connecting the first end of the second resistor with the first end of the third resistor is the second end of the second switch unit, and the third end of the second transistor is the third end of the second switch unit;

The third switch unit comprises a fifth resistor, a sixth resistor and a third transistor, wherein the first end of the fifth resistor is connected with the first end of the third transistor and the first end of the sixth resistor, the second end of the sixth resistor is grounded with the second end of the third transistor, the second end of the fifth resistor is the first end of the third switch unit, and the third end of the third transistor is the second end of the third switch unit.

4. The power conversion circuitry of claim 3, wherein when the first power source is in a start-up state and the second power source is in an off state, the sixth resistor is configured to control the third transistor to be in a non-conductive state, and the third transistor, the second resistor, the third resistor, and the fourth resistor in a non-conductive state are configured to control the first transistor and the second transistor to be in a conductive state;

When the second power supply is in a starting state, the fifth resistor and the sixth resistor are used for controlling the third transistor to be in a conducting state, the third transistor in the conducting state is used for controlling the second transistor to be in a non-conducting state, and the second transistor in the non-conducting state and the first resistor are used for controlling the first transistor to be in the non-conducting state.

5. The power conversion circuitry of claim 4, wherein a resistance value of the fourth resistor is greater than a resistance value of the second resistor, a resistance value of the third resistor;

the resistance value of the sixth resistor is larger than the resistance value of the fifth resistor.

6. The power conversion circuitry of claim 1, wherein the second switching function circuit comprises a fourth switching unit and a fifth switching unit;

The first end of the fourth switch unit is connected with the first end of the fifth switch unit, the second end of the fourth switch unit is connected with the second end of the fifth switch unit, the end formed by connecting the first end of the fourth switch unit with the first end of the fifth switch unit is the first end of the second switch function circuit, and the third end of the fourth switch unit is the second end of the second switch function circuit;

When the second power supply is in a starting state, the fifth switch unit is in a conducting state; the fifth switch unit in a conducting state is used for controlling the fourth switch unit to be in a conducting state, and the fourth switch unit in a conducting state is used for transmitting a second power supply voltage provided by the second power supply to the load circuit.

7. The power conversion circuit system according to claim 6, wherein the fourth switching unit includes a seventh resistor and a fourth transistor, a first end of the seventh resistor is connected to the first end of the fourth transistor, a second end of the seventh resistor is connected to the second end of the fourth transistor, an end formed by connecting the first end of the seventh resistor and the first end of the fourth transistor is the first end of the fourth switching unit, an end formed by connecting the second end of the seventh resistor and the second end of the fourth transistor is the second end of the fourth switching unit, and a third end of the fourth transistor is the third end of the fourth switching unit;

The fifth switch unit comprises an eighth resistor, a ninth resistor and a fifth transistor, wherein the first end of the eighth resistor is connected with the first end of the ninth resistor and the first end of the fifth transistor, the second end of the ninth resistor is grounded with the second end of the fifth transistor, the second end of the eighth resistor is the first end of the fifth switch unit, and the third end of the fifth transistor is the second end of the fifth switch unit;

When the second power supply is in a starting state, the eighth resistor and the ninth resistor are used for controlling the fifth transistor to be in a conducting state, the fifth transistor in the conducting state is used for controlling the fourth transistor to be in a conducting state, and the fourth transistor in the conducting state and the seventh resistor are used for controlling the fourth transistor to be in a conducting state.

8. The power conversion circuitry of claim 7, wherein a resistance value of the ninth resistor is greater than a resistance value of the eighth resistor.

9. The power conversion circuitry of claim 1, wherein the power conversion circuitry further comprises a third switching function circuit;

the second end of the first power supply is connected with the first end of the third switch function circuit, the second end of the second power supply is connected with the second end of the third switch function circuit, the third end of the first switch function circuit and the second end of the second switch function circuit are connected with the third end of the third switch function circuit, and the fourth end of the third switch function circuit is connected with the load circuit;

When the first power supply is in a starting state and the second power supply is in a closing state, the third switch function circuit is in a conducting state, and the third switch function circuit in the conducting state, the first switch function circuit in the conducting state and the first power supply form a first power supply circuit so as to transmit a first power supply voltage provided by the first power supply to the load circuit;

when the second power supply is in a starting state, the third switch function circuit is in a conducting state, and the third switch function circuit in the conducting state, the second switch function circuit in the conducting state and the second power supply form a second power supply circuit so as to transmit a second power supply voltage provided by the second power supply to the load circuit.

10. The power conversion circuitry of claim 9, wherein the third switching function circuit comprises a first diode, a second diode, a tenth resistor, an eleventh resistor, a twelfth resistor, a sixth transistor, and a seventh transistor;

The first end of the first diode, the first end of the second diode and the first end of the tenth resistor are connected, the second end of the tenth resistor is connected with the first end of the eleventh resistor and the first end of the sixth transistor, the second end of the sixth transistor is connected with the first end of the twelfth resistor and the first end of the seventh transistor, the second end of the seventh transistor is connected with the second end of the twelfth resistor, the second end of the eleventh resistor is grounded with the third end of the sixth resistor, the second end of the first diode is the first end of the third switch function circuit, the second end of the second diode is the second end of the third switch function circuit, the third end of the seventh transistor is the third end of the third switch function circuit, and the end formed by connecting the second end of the seventh transistor and the second end of the twelfth resistor is the fourth switch function circuit.

11. The power conversion circuitry of claim 10, wherein when the first power supply is in a start-up state and the second power supply is in a shut-down state, the first power supply provides the first power supply voltage to the third switch function circuit, the eleventh resistor is used to control the sixth transistor to be in a conductive state, the sixth transistor in a conductive state is used to control the seventh transistor to be in a conductive state, and the twelfth resistor is used to prevent the seventh transistor from being in a conductive state when the first power supply is in a shut-down state;

When the first power supply is in a closed state and the second power supply is in an on state, the second power supply provides the second power supply voltage to the third switch function circuit, the eleventh resistor is used for controlling the sixth transistor to be in a conducting state, the sixth transistor in the conducting state is used for controlling the seventh transistor to be in the conducting state, and the twelfth resistor is used for preventing the sixth transistor from being in the conducting state when the second power supply is in the closed state.

12. The power conversion circuitry of claim 10, wherein when the first power supply and the second power supply are both in a start-up state and a first power supply voltage provided by the first power supply is greater than a second power supply voltage provided by the second power supply, the first diode is configured to transmit the first power supply voltage to components of the third switching function circuit other than the first diode and the second diode to control the sixth transistor and the seventh transistor to be in a conductive state;

the second diode is configured to prevent the first power supply voltage from being transferred to the second power supply.

13. The power conversion circuitry of claim 10, wherein when the first power source and the second power source are both in a start-up state and a voltage value of a second power source voltage provided by the second power source is greater than a voltage value of a first power source voltage provided by the first power source, the second diode is configured to transmit the second power source voltage to components of the third switching function circuit other than the first diode and the second diode, so as to control the sixth transistor and the seventh transistor to be in a conductive state;

the first diode is used for preventing the second power supply voltage from being transmitted to the first power supply.

14. The power conversion circuitry of claim 10, wherein a resistance value of the eleventh resistor is greater than a resistance value of the tenth resistor.

15. An electronic device comprising the power conversion circuitry of any of claims 1-14, the power conversion circuitry being coupled to a first power source, a second power source, and a load circuit.

16. A power conversion device comprising power conversion circuitry according to any one of claims 1 to 14, the power conversion circuitry being connected to a first power source, a second power source and a load circuit.