Power supply circuit, power supply and vehicle

Abstract

The embodiment of the utility model provides a power supply circuit, a power supply and a vehicle. The power supply circuit comprises a main power supply module and an auxiliary power supply module. The input end of the main power module is used for being externally connected with a low-voltage battery. The input end of the auxiliary power supply module is used for externally connecting a high-voltage battery. The auxiliary power supply module comprises a first power supply conversion unit and an overvoltage protection unit, and the overvoltage protection unit is electrically connected with the first power supply conversion unit. Wherein the overvoltage protection unit comprises an overvoltage starting part and a switch part, the switch part is electrically connected with the first power conversion unit, and the output end of the switch part is used for being externally connected with the input end of a driving module. The overvoltage starting part is electrically connected between the first power conversion unit and the switch part. The overvoltage starting part controls the switch part to be in an open-circuit state based on the fact that the voltage value output by the first power conversion unit is larger than or equal to the voltage value output by the main power module. According to the embodiment of the invention, when the main power supply module is normal, the power supply right of the main power supply cannot be snapped by the auxiliary power supply module.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power supply, in particular to a power supply circuit, a power supply and a vehicle. BACKGROUND

[0002] The power supply circuit is a circuit for providing power supply to a device or a back-end circuit, which plays an extremely important role in electronic appliances. In order to ensure that the device or the back-end circuit has stable power supply, the power supply circuit will be configured with a main power supply and an auxiliary power supply. The main power supply is the preferred power supply for providing power supply to the device or the back-end circuit. When the main power supply fails, the auxiliary power supply will continue to supply power to the device or the back-end circuit to maintain the normal operation of the device or the back-end circuit.

[0003] On an electric vehicle, in order to improve driving safety and deal with unexpected situations such as towing a trailer, a high-voltage battery is used as a backup power supply for a low-voltage battery. The low-voltage battery is used to provide power for the main power supply, and the high-voltage battery is used to provide power for the auxiliary power supply. In order to ensure the power supply right of the main power supply, the output voltage of the auxiliary power supply is lower than that of the main power supply, and the clamping function of the diode is used to ensure the power supply right of the main power supply.

[0004] However, if the auxiliary power supply of the power supply circuit fails and its output voltage is higher than that of the main power supply, the auxiliary power supply will seize the power supply right of the main power supply, resulting in the situation that the low-voltage battery is idle and the high-voltage battery supplies power to the control system of the vehicle. The high-voltage battery is the power battery of the vehicle. The consumption speed of the high-voltage battery will directly affect the endurance of the vehicle. Therefore, the idle of the low-voltage battery and the supply of power to the control system of the vehicle by the high-voltage battery will accelerate the consumption speed of the high-voltage battery and ultimately affect the endurance of the vehicle. Practical new type content

[0005] Therefore, the embodiments of the present application provide a power supply circuit, a power supply and a vehicle to prevent the power supply right of the main power supply from being seized by the auxiliary power supply module when the main power supply module is normal.

[0006] In a first aspect, an embodiment of the present application provides a power supply circuit, comprising: a main power supply module and an auxiliary power supply module. An input end of the main power supply module is configured to be externally connected to a low-voltage battery, and an output end of the main power supply module is configured to be externally connected to an input end of a driving module. An input end of the auxiliary power supply module is configured to be externally connected to a high-voltage battery, and an output end of the auxiliary power supply module is configured to be externally connected to an input end of the driving module. The auxiliary power supply module comprises a first power supply conversion unit and an overvoltage protection unit, an input end of the overvoltage protection unit is electrically connected to an output end of the first power supply conversion unit, and an output end of the overvoltage protection unit is configured to be externally connected to the input end of the driving module. The overvoltage protection unit comprises an overvoltage starting part and a switching part, an input end of the switching part is electrically connected to the output end of the first power supply conversion unit, and an output end of the switching part is configured to be externally connected to the input end of the driving module. The overvoltage starting part is electrically connected between the output end of the first power supply conversion unit and a control end of the switching part, and the overvoltage starting part controls the switching part to be in an open circuit state based on a voltage value output by the first power supply conversion unit being greater than or equal to a voltage value output by the main power supply module.

[0007] In a possible implementation manner of the first aspect, the overvoltage starting part comprises: a first resistor, a zener diode, and a first transistor. A first end of the first resistor is electrically connected to the output end of the first power supply conversion unit, a second end of the first resistor is electrically connected to a negative electrode of the zener diode, and a positive electrode of the zener diode is grounded. A first end of the first transistor is electrically connected to the first end of the first resistor, a second end of the first transistor is electrically connected to the control end of the switching part, and a control end of the first transistor is electrically connected to the second end of the first resistor.

[0008] In a possible implementation manner of the first aspect, the first transistor is a triode. The overvoltage starting part further comprises a second resistor. The second resistor is electrically connected between the control end of the first transistor and the second end of the first resistor.

[0009] In a possible implementation manner of the first aspect, the first transistor is a field effect transistor.

[0010] In a possible implementation manner of the first aspect, the overvoltage starting part further comprises a third resistor. The third resistor is electrically connected between the second end of the first transistor and a ground end.

[0011] In a possible implementation manner of the first aspect, the overvoltage protection unit further comprises: a clamping part connected in parallel with the zener diode, and the clamping part is configured to clamp a voltage across the zener diode based on reverse conduction of the zener diode.

[0012] In a possible implementation manner of the first aspect, the clamping part comprises a second transistor, the second transistor is an N-channel transistor, a first end of the second transistor is electrically connected to the negative electrode of the zener diode, a second end of the second transistor is electrically connected to the positive electrode of the zener diode, and a control end of the second transistor is electrically connected to the second end of the first transistor.

[0013] In a possible implementation manner of the first aspect, the clamping unit includes a second transistor, the second transistor is a P-channel transistor, a first end of the second transistor is electrically connected with the negative electrode of the voltage stabilizing diode, a second end of the second transistor is electrically connected with the positive electrode of the voltage stabilizing diode, and a control end of the second transistor is electrically connected with the first end of the first transistor.

[0014] In a possible implementation manner of the first aspect, the output end of the overvoltage protection unit is further configured to be electrically connected with a warning module, and the warning module is configured to give a prompt when the switching unit is in the off state.

[0015] In the second aspect, an embodiment of the present application provides a power supply, including the power supply circuit provided in the first aspect.

[0016] In the third aspect, an embodiment of the present application provides a vehicle, including the power supply circuit provided in the first aspect, or the vehicle includes the power supply provided in the second aspect.

[0017] In the embodiment of the present application, the overvoltage protection unit is used to protect the auxiliary power supply module, so as to prevent the auxiliary power supply module from stealing the power supply right of the main power supply module due to the output voltage rising caused by the failure of the auxiliary power supply module, and finally increase the stability and practicability of the power supply circuit. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Figure 1 A schematic diagram of a power supply circuit provided in an embodiment of the present application.

[0020] Figure 2 A schematic diagram of an overvoltage protection unit provided in an embodiment of the present application.

[0021] Figure 3 A schematic diagram of an overvoltage protection unit provided in an embodiment of the present application.

[0022] Figure 4 A schematic diagram of a power supply circuit provided in an embodiment of the present application.

[0023] Figure 5 A schematic diagram of an overvoltage protection unit provided in an embodiment of the present application.

[0024] Figure 6 A schematic diagram of an overvoltage protection unit provided in an embodiment of the present application.

[0025] Figure 7 A schematic diagram of an overvoltage protection unit provided for an embodiment of the present application.

[0026] Figure 8 A schematic diagram of an overvoltage protection unit provided for an embodiment of the present application.

[0027] Figure 9 A schematic diagram of an overvoltage protection unit provided for an embodiment of the present application.

[0028] Figure 10 A schematic diagram of a power supply circuit provided for an embodiment of the present application.

[0029] Figure 11 A schematic diagram of a power supply circuit provided for an embodiment of the present application.

[0030] Label description

[0031] 001, low-voltage battery; 002, high-voltage battery; 010, driving module; 011, driving power supply; 012, driving circuit; 020, warning module; 021, single-chip microcomputer; 100, power supply circuit; 110, main power supply module; 120, auxiliary power supply module; 121, first power conversion unit; 122, overvoltage protection unit; 1221, overvoltage starting part; 1222, switch part; 1223, clamping part; 123, reset unit. DETAILED DESCRIPTION

[0032] In order to better understand the technical solutions of the present application, the embodiments of the present application will be described in detail below with reference to the drawings.

[0033] It should be clear that the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0034] The terms used in the embodiments of the present application are only for the purpose of describing the specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0035] It should be understood that the term "and / or" used herein is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0036] Figure 1 A schematic diagram of a power supply circuit is provided for the embodiments of the present application.

[0037] As shown in Figure 1 The present application provides a power supply circuit 100, which comprises a main power module 110 and an auxiliary power module 120. The main power module 110 is the preferred power supply for the driving module 010, and the auxiliary power module 120 is the backup module of the main power module 110, that is, when the main power module 110 fails or has insufficient power supply capability, the auxiliary power module 120 takes over the power supply of the driving module 010. The driving module 010 is used to provide a driving signal to an electronic device or equipment. For example, in a possible implementation, the driving module 010 comprises a driving power supply 011 and a driving circuit 012, the driving power supply 011 is used to convert the output voltage of the main power module 110 or the auxiliary power module 120 received into the voltage required by the driving circuit 012, and the driving circuit 012 is used to generate a driving signal for an electronic device or equipment.

[0038] The input end of the main power module 110 is used to externally connect a low-voltage battery 001, and the output end of the main power module 110 is used to externally connect the input end of the driving module 010. In a possible implementation, the low-voltage battery 001 can be a storage battery that provides power supply for a vehicle control system, and the output voltage thereof is low, for example, the output voltage thereof ranges from 9V to 16V.

[0039] The input end of the auxiliary power module 120 is used to externally connect a high-voltage battery 002, and the output end of the auxiliary power module 120 is used to externally connect the input end of the driving module 010. The auxiliary power module 120 comprises a first power conversion unit 121 and an overvoltage protection unit 122, the input end of the overvoltage protection unit 122 is electrically connected to the output end of the first power conversion unit 121, and the output end of the overvoltage protection unit 122 is used to externally connect the input end of the driving module 010. In a possible implementation, the high-voltage battery 002 can be a power battery of a vehicle, and the power battery refers to a battery that provides power supply for a driving motor of the vehicle. The output voltage of the power battery is high, for example, the output voltage of the power battery is 400V-800V.

[0040] The overvoltage protection unit 122 includes an overvoltage starting unit 1221 and a switch unit 1222. The input end of the switch unit 1222 is electrically connected with the output end of the first power conversion unit 121. The output end of the switch unit 1222 is used for externally connecting the input end of the driving module 010. The switch unit 1222 is used for controlling the circuit between the output end of the first power conversion unit 121 and the input end of the driving module 010. The overvoltage starting unit 1221 is electrically connected between the output end of the first power conversion unit 121 and the control end of the switch unit 1222. The overvoltage starting unit 1221 controls the switch unit 1222 to be in an open circuit state based on the voltage value output by the first power conversion unit 121 being greater than or equal to the voltage value output by the main power module 110.

[0041] The overvoltage starting unit 1221 can be automatically started when the voltage value output by the first power conversion unit 121 is greater than or equal to the voltage value output by the main power module 110. The starting of the overvoltage starting unit 1221 means that there is a current flowing through the main circuit thereof. After the overvoltage starting unit 1221 is started, the overvoltage starting unit 1221 controls the switch unit 1222 to be in an open circuit state, thereby disconnecting the circuit between the input end of the driving module 010 and the first telephone conversion unit 121, playing a role of overvoltage protection, and finally preventing the output voltage from being increased due to the failure of the auxiliary power module 120 to seize the power supply right of the main power module 110, thereby ensuring the stability of the main power supply.

[0042] In the embodiment of the present application, the overvoltage protection unit 122 is used for overvoltage protection of the auxiliary power module 120, thereby preventing the output voltage from being increased due to the failure of the auxiliary power module 120 to seize the power supply right of the main power module 110, and finally increasing the stability and practicability of the power supply circuit 100.

[0043] Figure 2 A schematic diagram of an overvoltage protection unit provided in the embodiment of the present application. Figure 3 A schematic diagram of an overvoltage protection unit provided in the embodiment of the present application.

[0044] As shown in Figure 2 or Figure 3 In the embodiment of the present application, the overvoltage starting unit 1221 includes a first resistor R1, a voltage stabilizing diode D1, and a first transistor Q1. The first end of the first resistor R1 is electrically connected with the output end of the first power conversion unit 121. The second end of the first resistor R1 is electrically connected with the negative electrode of the voltage stabilizing diode D1, and the positive electrode of the voltage stabilizing diode D1 is grounded. The first end of the first transistor Q1 is electrically connected with the first end of the first resistor R1. The second end of the first transistor Q1 is electrically connected with the control end of the switch unit. The control end of the first transistor Q1 is electrically connected with the second end of the first resistor R1.

[0045] The branch in which the first resistor R1 is located is the main branch of the overvoltage starting unit 1221, and the starting of the overvoltage starting unit 1221 refers to the existence of current flowing through the first resistor R1.

[0046] In this embodiment, the first resistor R1 is connected in series with the voltage stabilizing diode D1. The first resistor R1 is used to limit the current of the voltage stabilizing diode D1, so as to prevent the current flowing through the voltage stabilizing diode D1 from being too large to cause thermal breakdown of the voltage stabilizing diode D1. When the output voltage of the first power conversion unit 121 is greater than or equal to a limit value (for example, the output voltage of the main power module, such as 15V), the voltage stabilizing diode D1 is in an off state, the current of the first resistor R1 is zero, the first transistor Q1 is off, and the switch control module 120 is turned on. When the output voltage of the first power conversion unit 121 is greater than or equal to the limit value, the voltage stabilizing diode D1 is broken down, and there is current flowing through the first resistor R1, so that a voltage drop is formed across the first resistor R1, that is, a voltage drop is formed between the first end and the control end of the first transistor Q1, and the first transistor Q1 is turned on. The voltage at the second end of the first transistor Q1 is pulled high, so as to turn off the switch unit 1222 and realize overvoltage protection.

[0047] As shown in Figure 2 In a possible implementation, the first transistor Q1 is a triode. In an implementation, the first transistor Q1 is a PNP triode, and the first transistor Q1 is turned on when a voltage drop exists across the first resistor R1. The overvoltage starting unit 1221 further includes a second resistor R2. The second resistor R2 is electrically connected between the control end of the first transistor Q1 and the second end of the first resistor R1. That is, the second resistor R2 is electrically connected between the base of the first transistor Q1 and the second end of the first resistor R1. The second resistor R2 is used to limit the base current of the first transistor Q1, so as to prevent the base current of the first transistor Q1 from being too large to burn out the first transistor Q1. The first end of the first transistor Q1 is the emitter, and the second end of the first transistor Q1 is the collector.

[0048] As shown in Figure 3 In an embodiment of the present application, the first transistor Q1 is a field effect transistor, for example, the first transistor Q1 is a P-channel transistor, such as a PMOS. The gate of the first transistor Q1 is directly electrically connected with the second end of the first resistor R1. The first end of the first transistor Q1 is the source, and the second end of the first transistor Q1 is the drain.

[0049] In this embodiment, the first transistor Q1 is a field effect transistor, which can realize isolation between the main branch in which the first resistor R1 is located and the source / drain of the first transistor Q1. At the same time, the first transistor Q1 is a field effect transistor, which is conducive to circuit integration and simplifies the circuit structure and reduces the overall power consumption of the circuit.

[0050] As shown in Figure 2 orFigure 3 As shown, in one embodiment of this application, the overvoltage activation unit 1221 further includes a third resistor R3. The third resistor R3 is electrically connected between the second terminal of the first transistor Q1 and the ground terminal.

[0051] In this embodiment, the function of the third resistor R3 is to limit current and divide voltage to prevent the current of the first transistor Q1 from being too large, thereby achieving the purpose of protecting the first transistor Q1.

[0052] Figure 4 This is a schematic diagram of a power supply circuit provided in an embodiment of this application. Figure 5 This is a schematic diagram of an overvoltage protection unit provided in an embodiment of this application. Figure 6 This is a schematic diagram of an overvoltage protection unit provided in an embodiment of this application. Figure 7 This is a schematic diagram of an overvoltage protection unit provided in an embodiment of this application.

[0053] like Figures 4 to 7 As shown, in one embodiment of this application, the overvoltage protection unit 122 further includes a clamping part 1223. The clamping part 1223 is connected in parallel with the Zener diode D1, and the clamping part 1223 is used to clamp the voltage across the Zener diode D1 based on the reverse conduction of the Zener diode D1.

[0054] When the voltage across Zener diode D1 reaches the conduction threshold, it reverse-biased conduction, activating the overvoltage startup unit, which then carries current in its main circuit. However, when the output voltage of the first power conversion unit 121 fluctuates near the reverse conduction threshold of Zener diode D1, the current in the main circuit of the overvoltage startup unit repeatedly switches between on and off, causing repeated switching between on and off states of the first transistor Q1, ultimately leading to instability in the entire power circuit. In this embodiment, when Zener diode D1 reverse-biased conduction, clamping part 1223 is activated, pulling down and clamping the voltage across Zener diode D1. This ensures that even if Zener diode D1 breaks down in reverse, the current in the main circuit of the overvoltage startup unit 1223 can be maintained, thus guaranteeing the stability of the first transistor Q1. Therefore, clamping part 1223 can prevent Zener diode D1 from repeatedly switching between on and off states at the conduction threshold. It should be noted that the current in the main circuit of the overvoltage starter 1223 can be maintained, which means that the current in the main circuit of the overvoltage starter 1223 is greater than zero, and does not mean that the current value is limited to remain unchanged. For example, the current value in the main circuit of the overvoltage starter 1223 may fluctuate briefly and then stabilize.

[0055] like Figure 5 or Figure 6As shown, in one implementation of this embodiment, the clamping part 1223 includes a second transistor Q2, which is an N-channel transistor. The first terminal of the second transistor Q2 is electrically connected to the negative terminal of the Zener diode D1, and the second terminal of the second transistor Q2 is electrically connected to the positive terminal of the Zener diode D1. The control terminal of the second transistor Q2 is electrically connected to the second terminal of the first transistor Q1. Figure 5 and Figure 6 The difference is that, Figure 5 The first transistor Q1 in the diagram is a bipolar transistor; Figure 6 The first transistor Q1 in the transistor is a P-channel transistor.

[0056] In this implementation, the second transistor Q2 is an N-channel transistor, thus it can conduct when a high-level signal is received at the control terminal. The first terminal of the second transistor Q2 is the drain, and the second terminal is the source. After the overvoltage startup section 1223 is activated, the first transistor Q1 conducts, thereby increasing the potential of the voltage at the second terminal of the first transistor Q1, which in turn causes the second transistor Q2 to conduct, thereby clamping the voltage across the Zener diode D1 between the first and second terminals of the second transistor Q2. In one possible implementation, the second transistor is an NMOS.

[0057] like Figure 7 As shown, in one possible implementation of this embodiment, the clamping part includes a second transistor Q2, which is an NPN transistor. The first terminal of the second transistor Q2 is electrically connected to the negative terminal of the Zener diode D1, and the second terminal of the second transistor Q2 is electrically connected to the positive terminal of the Zener diode D1. The control terminal of the second transistor Q2 is electrically connected to the second terminal of the first transistor Q1. The first terminal of the second transistor Q2 is the collector, and the second terminal of the second transistor Q2 is the emitter.

[0058] Figure 8 This is a schematic diagram of an overvoltage protection unit provided in an embodiment of this application.

[0059] like Figure 8 As shown, in one embodiment of this application, the clamping part 1223 includes a second transistor Q2, which is a P-channel transistor. The first terminal of the second transistor Q2 is electrically connected to the negative terminal of the Zener diode D1, the second terminal of the second transistor Q2 is electrically connected to the positive terminal of the Zener diode D1, and the control terminal of the second transistor Q2 is electrically connected to the first terminal of the first transistor Q1.

[0060] In the embodiment, the first end of the first transistor Q1 is electrically connected with the output end of the first power conversion unit 121 through the voltage dividing resistor R4. The second transistor Q2 is a P-channel transistor. Therefore, the second transistor Q2 can be turned on when the control end receives a low-level signal. The first end of the second transistor Q2 is a source, and the second end of the second transistor Q2 is a drain. After the overvoltage starting unit 1223 is started, the first transistor Q1 is turned on, so that the voltage potential of the second end of the first transistor Q1 is pulled low, and the second transistor Q2 is turned on, so that the voltage across the zener diode D1 is clamped to the voltage between the first end and the second end of the second transistor Q2. In a possible implementation, the second transistor is a PMOS.

[0061] Figure 9 A schematic diagram of an overvoltage protection unit provided in an embodiment of the present application.

[0062] As shown in Figure 9 the embodiment of the present application, the clamping unit 1223 includes a second transistor Q2, the second transistor Q2 is a PNP, the first end of the second transistor Q2 is electrically connected with the negative electrode of the zener diode D1, the second end of the second transistor Q2 is electrically connected with the positive electrode of the zener diode D1, and the control end of the second transistor Q2 is electrically connected with the first end of the first transistor Q1. The first end of the second transistor Q2 is an emitter, and the second end of the second transistor Q2 is a collector.

[0063] In the embodiment of the present application, the switching unit 1222 includes a third transistor T1. The first end of the third transistor T1 is electrically connected with the output end of the first power conversion unit 121. The second end of the third transistor T1 is the output end of the switching unit 1222, that is, the output end of the overvoltage protection unit 122. The control end of the third transistor T1 is electrically connected with the overvoltage starting unit 1221. The control end of the third transistor T1 is the control end of the switching unit 1222. In a possible implementation, the third transistor T1 can be a PMOS.

[0064] Figure 10 A schematic diagram of a power supply circuit provided in an embodiment of the present application.

[0065] As shown in Figure 10As shown, in one embodiment of this application, the power supply circuit 100 further includes a first clamping diode D2 and a second clamping diode D3. The first clamping diode D2 is electrically connected between the output terminal of the switching unit 1222 and the input terminal of the driving module 010. Specifically, the anode of the first clamping diode D2 is electrically connected to the output terminal of the switching unit 1222, and the cathode of the first clamping diode D2 is electrically connected to the input terminal of the driving module 010. The second clamping diode D3 is electrically connected between the output terminal of the main power module 110 and the input terminal of the driving module 010. The anode of the second clamping diode D3 is electrically connected to the output terminal of the main power module 110, and the cathode of the second clamping diode D3 is electrically connected to the input terminal of the driving module 010.

[0066] In this embodiment, the rated output voltage of the auxiliary power supply module is lower than the rated output voltage of the main power supply module. In this embodiment, the output terminal of the auxiliary power supply module is the output terminal of the switch section 1222. Since the output voltage of the auxiliary power supply module is lower than the output voltage of the main power supply, when the output voltage of the main power supply module (e.g., 15V) is normal, the negative potentials of the second clamping diode D3 and the first clamping diode D2 are clamped at the output voltage of the main power supply module minus the conduction threshold of the second clamping diode D3 (e.g., 14.3V), and the first clamping diode D2 cannot conduct. At this time, the main power supply module 110 supplies power to the drive module 010. When the output voltage of the main power supply module 110 is lower than the output voltage of the auxiliary power supply 120 (e.g., 14V), the negative potentials of the first clamping diode D2 and the second clamping diode D3 are clamped at the power supply of the auxiliary power supply module 120 minus the conduction threshold of the second clamping diode D3 (e.g., 13.3V). At this time, the auxiliary power supply module 120 supplies power to the drive module 010. When the output voltage of the auxiliary power supply 120 exceeds the conduction threshold of the Zener diode D1, the overvoltage start-up unit 122 is activated, disconnecting the line between the auxiliary power supply module 120 and the drive module 010.

[0067] like Figure 10 As shown, in one embodiment of this application, the output terminal of the overvoltage protection unit 122 is also used to be electrically connected to the warning module 020, which is used to provide a warning when the switch is in an open circuit state.

[0068] The warning module 020 is configured to display warning information to the user, and the warning information comprises at least one of an audible and visual prompt, a warning light prompt, an information prompt, and a voice prompt. In a possible implementation, the warning module 020 comprises a single-chip microcomputer 021, and the single-chip microcomputer 021 is electrically connected to the output end of the overvoltage protection unit 122, for example, the single-chip microcomputer 021 is electrically connected to the output end of the switch unit 1222. For example, when the auxiliary power supply module 120 is normal, the switch unit 1222 is turned on, and the signal received by the single-chip microcomputer 021 is a high potential; after the voltage of the auxiliary power supply module 120 exceeds the voltage threshold, the switch unit 1222 is turned off, and the signal received by the single-chip microcomputer 021 is a low potential, and the single-chip microcomputer 021 will send a warning information when receiving the low potential signal, so as to remind the user to timely troubleshoot or repair.

[0069] Figure 11 A schematic diagram of a power supply circuit is provided in the embodiments of the present application.

[0070] As shown in the figure, Figure 11 In the embodiments of the present application, the auxiliary power supply module 120 further comprises a reset unit 123, and the reset unit 123 is electrically connected between the input end of the auxiliary power supply module 120 and the input end of the overvoltage protection unit 122. For example, the reset unit 123 is electrically connected between the first power conversion unit 121 and the overvoltage protection unit 122. The reset unit 123 is controlled by a single-chip microcomputer or a VCU (vehicle control unit). In a possible implementation, the reset unit 123 comprises a fourth transistor Q4, and after troubleshooting, the reset unit 123 can be reset by the VCU or the single-chip microcomputer: for example, the fourth transistor Q4 is first controlled to be turned off, and then maintained for a preset time (for example, 0.1s-3s), and then the fourth transistor Q4 is controlled to be turned on, so as to cancel the overvoltage protection of the overvoltage protection unit 122. In a possible implementation, the fourth transistor Q4 is a field effect transistor.

[0071] The embodiments of the present application further provide a power supply comprising the power supply circuit provided in any one of the preceding embodiments.

[0072] The power supply provided in the embodiments of the present application has good stability, and can effectively ensure that the power supply right of the main power supply is not grabbed by the auxiliary power supply when the main power supply is normally powered.

[0073] The embodiments of the present application further provide a vehicle comprising the power supply circuit provided in any one of the preceding embodiments, or the vehicle comprising the power supply provided in the preceding embodiments.

[0074] The vehicle provided in the embodiments of the present application has a power supply with good stability, and can effectively ensure that the power supply right of the main power supply is not grabbed by the auxiliary power supply when the main power supply is normally powered.

Claims

1. A power supply circuit, characterized by comprising: The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit.

2. The power supply circuit of claim 1, wherein, The application relates to a power supply circuit.

3. The power supply circuit of claim 2, wherein, The application relates to a power supply circuit.

4. The power supply circuit of claim 2, wherein, The application relates to a power supply circuit.

5. The power supply circuit of claim 2, wherein, The application relates to a power supply circuit.

6. The power supply circuit of claim 2, wherein, The application relates to a power supply circuit.

7. The power supply circuit of claim 6, wherein, The application relates to a power supply circuit.

8. The power supply circuit of claim 6, wherein, The application relates to a power supply circuit.

9. A power supply circuit according to any one of claims 6 to 8, characterised in that, The application relates to a power supply circuit.

10. A power supply, characterized by, The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. 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The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a power supply circuit. The application relates to a 11. A vehicle characterized by comprising: The vehicle comprises the power supply circuit according to any one of claims 1 to 9, or the vehicle comprises the power supply according to claim 10.

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