Voltage control circuit, voltage control device, and vehicle

Abstract

The utility model relates to the technical field of circuits, in particular to a voltage control circuit, a voltage control device and a vehicle, the voltage control circuit is used for being connected with a power generation system, the voltage control circuit comprises an energy consumption unit, and the first end of the energy consumption unit is connected with the power generation system; the switch unit is connected between the second end of the energy consumption unit and the ground; wherein the switch unit is used for enabling the energy consumption unit according to a conduction signal when receiving the conduction signal, so that the energy consumption unit absorbs pulse peak energy generated by the power generation system, and the conduction signal is generated when the output voltage of the power generation system is greater than a preset reference voltage. According to the voltage control circuit, the problem that the absorption effect is poor when a diode and a super capacitor are designed to absorb pulse peak energy in the prior art is solved, and the effect of absorbing the pulse peak energy can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit, in particular to a voltage control circuit, a voltage control device and a vehicle. BACKGROUND

[0002] When the vehicle is started by ignition and the starting is finished, the parasitic inductance in the generator or the motor inductance will cause overvoltage pulse spikes in the line due to the instantaneous disconnection of large current, which affects the safety of the battery system. At present, the related technology usually absorbs the pulse spike energy by designing diodes and super capacitors. Among them, the diode has a cumulative effect on the service life. The continuous absorption of pulse spike energy will reduce the service life of the diode, resulting in a decrease in the absorption capacity of the diode and a decrease in the effect of absorbing pulse spike energy. Once the super capacitor is fully charged, its absorption capacity decreases rapidly, and due to space limitations, the volume of the super capacitor equipped in the battery system is limited, so the capacity of the super capacitor is limited, resulting in a low absorption capacity of the super capacitor, which also reduces the effect of absorbing pulse spike energy. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a voltage control circuit, a voltage control device and a vehicle, which can solve the problem of poor absorption effect of pulse spike energy by designing diodes and super capacitors in the related technology.

[0004] In a first aspect, the present application provides a voltage control circuit applied to a vehicle, wherein the vehicle further comprises a power generation system, the voltage control circuit is used for connecting the power generation system, and the voltage control circuit comprises:

[0005] a power consumption unit, a first end of the power consumption unit being connected with the power generation system;

[0006] a switching unit, the switching unit being connected between a second end of the power consumption unit and the ground;

[0007] The switching unit is configured to enable the power consumption unit according to the conduction signal when the switching unit receives the conduction signal, so that the power consumption unit absorbs the pulse spike energy generated by the power generation system, and the conduction signal is generated when the output voltage of the power generation system is greater than a preset reference voltage.

[0008] In some embodiments, the power consumption unit comprises one or more parallel resistance branches, and at least one of the resistance branches comprises a first resistance connected in series.

[0009] In some embodiments, the power consumption unit comprises an adjustable resistance, one end of the adjustable resistance being connected with the power generation system, the other end of the adjustable resistance being connected with the switching unit, and the resistance value of the adjustable resistance being positively correlated with the output voltage of the power generation system.

[0010] In some embodiments, the energy consumption unit comprises a battery heating film, a first end of the battery heating film is connected with the power generation system, and a second end of the battery heating film is connected with the switch unit.

[0011] In some embodiments, the voltage control circuit further comprises a voltage detection unit, a first end of the voltage detection unit is connected with the power generation system, a second end of the voltage detection unit is connected with the switch unit, a third end of the voltage detection unit is configured to receive the reference voltage, and the voltage detection unit is configured to send the turn-off signal to the switch unit when detecting that the output voltage of the power generation system is greater than the reference voltage.

[0012] In some embodiments, the switch unit comprises a switch tube, a first end of the switch tube is connected with the second end of the voltage detection unit, a second end of the switch tube is connected with the second end of the energy consumption unit, and a third end of the switch tube is grounded.

[0013] In some embodiments, the voltage detection unit comprises a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a comparator.

[0014] A first end of the second resistor is configured to receive the reference voltage, a second end of the second resistor is connected with an inverting input terminal of the comparator, and an output terminal of the comparator is connected with the switch unit.

[0015] A first end of the third resistor is connected with the second end of the second resistor, a second end of the third resistor is grounded, and the second resistor and the third resistor are configured to divide the reference voltage.

[0016] A first end of the fourth resistor is configured to receive the output voltage of the power generation system, and a second end of the fourth resistor is connected with a non-inverting input terminal of the comparator.

[0017] A first end of the fifth resistor is connected with the second end of the fourth resistor, a second end of the fifth resistor is grounded, and the fourth resistor and the fifth resistor are configured to divide the output voltage.

[0018] In some embodiments, the switch unit is further configured to disconnect the energy consumption unit from the ground according to the turn-off signal received from the voltage detection unit, the turn-off signal being generated when the output voltage of the power generation system is less than or equal to the reference voltage.

[0019] In a second aspect, the application further provides a voltage control device, which comprises the voltage control circuit as described above.

[0020] In a third aspect, the application further provides a vehicle, comprising a power generation system and the voltage control device as described above.

[0021] The application discloses a voltage control circuit, a voltage control device and a vehicle. The voltage control circuit comprises a power consumption unit, a switch unit and a control unit. The power consumption unit is connected with the power generation system. The switch unit is connected between the second end of the power consumption unit and the ground. The switch unit is used for enabling the power consumption unit according to the conduction signal when the conduction signal is received, so that the power consumption unit absorbs the pulse peak energy generated by the power generation system. Since the power consumption unit has extremely low impedance and high power capacity, the pulse peak energy can be rapidly absorbed. In addition, the power consumption unit has no life accumulation effect, and the ability of the power consumption unit to absorb the pulse peak energy does not decrease with the life. In addition, the power consumption unit has small volume, and the capacity of the power consumption unit is not limited by the volume. The problem that the related art designs a diode and a super capacitor to absorb the pulse peak energy and has poor absorption effect is solved, and the effect of absorbing the pulse peak energy can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0023] Figure 1 is a structural schematic diagram of a vehicle provided by an embodiment of the application;

[0024] Figure 2 is a structural schematic diagram of a voltage control circuit provided by an embodiment of the application;

[0025] Figure 3 is a structural schematic diagram of another voltage control circuit provided by an embodiment of the application;

[0026] Figure 4 is a structural schematic diagram of another voltage control circuit provided by an embodiment of the application;

[0027] Figure 5 is a structural schematic diagram of another voltage control circuit provided by an embodiment of the application;

[0028] Figure 6 is a structural schematic diagram of another voltage control circuit provided by an embodiment of the application. DETAILED DESCRIPTION

[0029] With reference to the drawings, the technical solutions in the embodiments of the present application will be clearly and completely described below, obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present application.

[0030] The flowcharts shown in the drawings are only exemplary and do not necessarily include all contents and operations / steps, nor are they necessarily executed in the order described. For example, some operations / steps can be further decomposed, combined or partially merged, so the actual execution order can be changed according to the actual situation.

[0031] It should be understood that the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and the appended claims of the present application, unless otherwise clear from the context, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0032] It should also be understood that the term "and / or" used in the specification and the appended claims of the present application means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0033] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments and features in the embodiments can be combined with each other without conflict.

[0034] When the vehicle is started by ignition, the parasitic inductance or motor inductance in the generator will cause an overvoltage pulse spike in the line due to the instantaneous disconnection of the large current, affecting the safety of the battery system. In addition, before the regulator reacts, a high voltage output appears, such as exceeding the conventional voltage of a general 12V / 24V system, which can easily cause the driving computer to be protected, and in severe cases, the vehicle can directly stall. Therefore, how to absorb the pulse spike energy generated by the generator is particularly important.

[0035] Currently, the related technology usually absorbs pulse spike energy by designing diodes and super capacitors. Among them, the diode has a cumulative effect on the service life, and continuously absorbing pulse spike energy will reduce the service life of the diode, resulting in a decrease in the absorption capacity of the diode and reducing the effect of absorbing pulse spike energy. Once the super capacitor is fully charged, its absorption capacity decreases rapidly, and due to space limitations, the volume of the super capacitor equipped in the battery system is limited, so the capacity of the super capacitor is limited, resulting in a low absorption capacity of the super capacitor, which also reduces the effect of absorbing pulse spike energy.

[0036] To solve this technical problem, the embodiment of the present application provides a voltage control circuit, a voltage control device and a vehicle. The voltage control circuit is connected with the power generation system through the energy consumption unit, and the switch unit is connected between the second end of the energy consumption unit and the ground. The switch unit is used for enabling the energy consumption unit according to the conduction signal when the conduction signal is received, so that the energy consumption unit absorbs the pulse peak energy generated by the power generation system. Since the energy consumption unit has extremely low impedance and high power capacity, the pulse peak energy can be quickly absorbed, and the energy consumption unit does not have a cumulative effect on the life, and the ability of the energy consumption unit to absorb the pulse peak energy will not decrease with the life. In addition, the volume of the energy consumption unit is small, and the capacity of the energy consumption unit is not limited by the volume. The problem of poor absorption effect of the related art design of diode and super capacitor to absorb the pulse peak energy is solved, and the effect of absorbing the pulse peak energy can be improved. The circuit structure and working principle of the voltage control circuit will be described in detail below.

[0037] Please refer to Figure 1 , Figure 1 is a structural schematic diagram of a vehicle 10 provided by the embodiment of the present application. As shown in Figure 1 , the vehicle 10 can include a voltage control device 11 and a power generation system 12. The voltage control device 11 is connected with the power generation system 12.

[0038] The vehicle 10 can be a fuel vehicle, or a pure electric vehicle or a hybrid electric vehicle, including but not limited to a car, a bus, a truck, a truck, etc.

[0039] The power generation system 12 can include a generator, a parasitic inductance and other surrounding circuits. The power generation system 12 is used for power generation to provide electric energy for the operation of the vehicle 10 and to charge the battery system in the vehicle 10. The battery system can include at least a battery module. The battery module can include but is not limited to a lithium iron phosphate battery, a nickel hydrogen battery, a lithium battery, a flywheel battery, etc.

[0040] The voltage control device 11 is used to absorb the pulse peak energy generated by the power generation system 12, so as to prevent the output voltage V_BUS of the power generation system 12 from being too large to damage the battery module when the power generation system 12 charges the battery module.

[0041] As shown in Figure 1 , in some embodiments, the voltage control device 11 can include a voltage control circuit 110 connected with the power generation system 12, for absorbing the pulse peak energy generated by the power generation system 12.

[0042] Please refer to Figure 2 , Figure 2 is a structural schematic diagram of a voltage control circuit 110 provided by the embodiment of the present application. As shown in Figure 2As shown, the voltage control circuit 110 can include an energy consumption unit 1101 and a switch unit 1102. The first end of the energy consumption unit 1101 is connected with the power generation system 12, and the switch unit 1102 is connected between the second end of the energy consumption unit 1101 and the ground.

[0043] The switch unit 1102 is configured to enable the energy consumption unit 1101 according to the conduction signal when the conduction signal is received, so that the energy consumption unit 1101 absorbs the pulse peak energy generated by the power generation system 12. The conduction signal is generated when the output voltage V_BUS of the power generation system 12 is greater than the preset reference voltage. The preset reference voltage can be represented as VREF.

[0044] The conduction signal can be a high-level signal or a low-level signal. When the switch unit 1102 receives the conduction signal, the connection between the second end of the energy consumption unit 1101 and the ground can be turned on, so that the energy consumption unit 1101 absorbs the pulse peak energy generated by the power generation system 12. It can be understood that after the connection between the second end of the energy consumption unit 1101 and the ground is turned on, the energy consumption unit 1101 plays a role in voltage reduction, which can reduce the output voltage V_BUS of the power generation system 12, thereby achieving the effect of absorbing the pulse peak energy generated by the power generation system 12.

[0045] The preset reference voltage VREF can be set according to actual conditions, and the specific value is not limited herein. For example, the reference voltage VREF can be set according to the maximum charging voltage of the battery module, for example, 12V or 24V.

[0046] It should be noted that in the embodiments of the present application, the energy consumption unit 1101 is different from a diode or a super capacitor. The energy consumption unit 1101 has very low impedance and high power capacity, can quickly absorb pulse peak energy, and the energy consumption unit 1101 does not have cumulative life effect, and the ability of the energy consumption unit 1101 to absorb pulse peak energy does not decrease with age. In addition, the energy consumption unit 1101 has a small volume, and the capacity of the energy consumption unit 1101 is not limited by the volume, which solves the problem of poor absorption effect of the related art design of diodes and super capacitors to absorb pulse peak energy, and can improve the effect of absorbing pulse peak energy.

[0047] In some embodiments, the energy consumption unit 1101 can include one or more parallel resistance branches, and at least one resistance branch includes a first resistance connected in series. The first end of the first resistance is connected with the power generation system 12, and the second end of the first resistance is connected with the switch unit 1102.

[0048] Please refer to Figure 3 , Figure 3 is another structural schematic diagram of the voltage control circuit 110 provided by the embodiments of the present application. As shown inFigure 3 As shown, the energy consumption unit 1101 includes a plurality of parallel resistance branches, wherein each resistance branch includes a first resistor connected in series, for example, resistor R11,..., resistor R1N, N being the number of resistance branches.

[0049] In some embodiments, the first resistor is a chip resistor. It should be noted that since the chip resistor occupies a small area, the layout space occupied by the voltage control circuit 110 can be reduced.

[0050] It should be noted that, compared with a diode or a super capacitor, the first resistor has very low impedance and high power capacity, can quickly absorb pulse peak energy, and the first resistor does not have a cumulative life effect, and the ability of the first resistor to absorb pulse peak energy does not decrease with age. At the same time, the volume of the first resistor is small, which does not limit the capacity of the first resistor due to the volume, solves the problem of poor absorption effect of related art design of diode and super capacitor to absorb pulse peak energy, and can improve the effect of absorbing pulse peak energy. In addition, by configuring the energy consumption unit 1101 to include one or more parallel resistance branches, and at least one resistance branch includes a first resistor connected in series, the resistance value of the energy consumption unit 1101 can be increased or decreased, so that the energy consumption unit 1101 is suitable for different overvoltage pulse scenarios, and the applicability of the voltage control circuit 110 is improved.

[0051] In some embodiments, the energy consumption unit 1101 can include an adjustable resistor, one end of the adjustable resistor is connected with the power generation system, the other end is connected with the switch unit, and the resistance value of the adjustable resistor is positively correlated with the output voltage of the power generation system.

[0052] Please refer to Figure 4 , Figure 4 is another structural schematic diagram of a voltage control circuit 110 provided by the embodiments of the present application. As Figure 4 shown, the energy consumption unit 1101 includes an adjustable resistor R0, one end of the adjustable resistor R0 is connected with the power generation system 12, and the other end is connected with the switch unit 1102. Among them, the resistance value of the adjustable resistor R0 is positively correlated with the output voltage V_BUS of the power generation system 12. For example, when the output voltage V_BUS of the power generation system 12 increases, the resistance value of the adjustable resistor R0 increases, and when the output voltage V_BUS of the power generation system 12 decreases, the resistance value of the adjustable resistor R0 decreases.

[0053] In some embodiments, the adjustable resistor R0 is a chip resistor. It should be noted that since the chip resistor occupies a small area, the layout space occupied by the voltage control circuit 110 can be reduced.

[0054] The adjustable resistor R0 has extremely low impedance and high power capacity relative to the diode or super capacitor, can quickly absorb pulse peak energy, and the adjustable resistor R0 does not have a life accumulation effect, and the ability of the adjustable resistor R0 to absorb pulse peak energy does not decrease with age. At the same time, the adjustable resistor R0 has a small volume, and the capacity of the adjustable resistor R0 is not limited by the volume, solving the problem of poor absorption effect of the related art design of diodes and super capacitors to absorb pulse peak energy, and improving the effect of absorbing pulse peak energy. In addition, by configuring the energy consumption unit 1101 to include the adjustable resistor R0, the energy consumption unit 1101 can be adapted to different overvoltage pulse scenarios by increasing or decreasing the resistance value of the energy consumption unit 1101, thereby improving the applicability of the voltage control circuit 110.

[0055] In some embodiments, the energy consumption unit 1101 can include a battery heating film, a first end of the battery heating film being connected to the power generation system, and a second end of the battery heating film being connected to the switch unit.

[0056] It should be noted that the battery heating film is a heating material used to heat the battery module in a low temperature environment to ensure that the battery module can also be normally charged and discharged under low temperature conditions. The battery heating film is equivalent to a resistor and can consume electrical energy.

[0057] For example, the first end (for example, the end connected to the positive electrode of the battery module) of the battery heating film is connected to the power generation system, and the second end (for example, the end connected to the negative electrode of the battery module) of the battery heating film is connected to the switch unit.

[0058] It should be noted that in the embodiments of the present application, the battery heating film provided by the battery module can be used instead of the resistor in the energy consumption unit to absorb the pulse peak energy generated by the power generation system, which not only improves the effect of absorbing pulse peak energy, but also reduces the number of resistors, thereby saving hardware costs.

[0059] Please refer to Figure 5 , Figure 5 is another structure diagram of the voltage control circuit 110 provided by the embodiments of the present application. As Figure 5 shown, the voltage control circuit 110 further includes a voltage detection unit 1103, a first end of the voltage detection unit being connected to the power generation system 12, a second end of the voltage detection unit 1103 being connected to the switch unit 1102, a third end of the voltage detection unit 1103 being used to receive a reference voltage VREF, and the voltage detection unit 1103 being used to send an enabling signal to the switch unit 1102 when detecting that the output voltage V_BUS of the power generation system 12 is greater than the reference voltage VREF.

[0060] For example, the voltage detection unit 1103 can be configured to receive the output voltage V_BUS of the power generation system 12 and receive a reference voltage VREF, and compare the output voltage V_BUS with the reference voltage VREF, and send an on signal to the switch unit 1102 when the output voltage V_BUS is greater than the reference voltage VREF.

[0061] In the above embodiment, by configuring the voltage detection unit 1103 in the voltage control circuit 110, the voltage detection unit 1103 can be used to detect the size between the output voltage V_BUS of the power generation system 12 and the preset reference voltage VREF, and send an on signal to the switch unit 1102 when the output voltage V_BUS of the power generation system 12 is greater than the reference voltage VREF, so that the control logic is simple, and the reliability of the voltage control circuit 110 can be improved.

[0062] Please refer to Figure 6 , Figure 6 is another structure diagram of the voltage control circuit 110 provided by the embodiment of the present application. As shown in Figure 6 , the switch unit 1102 includes a switch tube Q1, the first end of the switch tube Q1 is connected with the second end of the voltage detection unit 1103, the second end of the switch tube Q1 is connected with the second end of the energy consumption unit 1101, and the third end of the switch tube Q1 is grounded.

[0063] For example, the switch tube Q1 can include but is not limited to a triode, a metal-oxide-semiconductor field-effect transistor (MOS), an insulated gate bipolar transistor (IGBT), a relay, an optical coupler, etc. For example, the switch tube Q1 can be an NPN type triode.

[0064] As shown in Figure 6 , the voltage detection unit 1103 can include a second resistor R2, a third resistor R3, a fourth resistor R3, a fifth resistor R5 and a comparator U1.

[0065] The first end of the second resistor R2 is configured to receive the reference voltage VREF, the second end of the second resistor R2 is connected with the inverting input terminal of the comparator U1, and the output terminal of the comparator U1 is connected with the switch unit 1102.

[0066] The first end of the third resistor R3 is connected with the second end of the second resistor R2, and the second end of the third resistor R3 is grounded. The second resistor R2 and the third resistor R3 are used for voltage division of the reference voltage VREF. It should be noted that by setting the second resistor R2 and the third resistor R3 for voltage division of the reference voltage VREF, the voltage input to the inverting input terminal of the comparator U1 can be kept in a reasonable range, avoiding the input voltage being greater than the upper limit of the voltage that the comparator U1 can accept.

[0067] The first end of the fourth resistor R4 is used for receiving the output voltage V_BUS of the power generation system 12, and the second end of the fourth resistor R4 is connected with the non-inverting input terminal of the comparator U1.

[0068] The first end of the fifth resistor R5 is connected with the second end of the fourth resistor R4, and the second end of the fifth resistor R5 is grounded. The fourth resistor R4 and the fifth resistor R5 are used for voltage division of the output voltage V_BUS. It should be noted that by setting the fourth resistor R4 and the fifth resistor R5 for voltage division of the output voltage V_BUS of the power generation system 12, the voltage input to the non-inverting input terminal of the comparator U1 can be kept in a reasonable range, avoiding the input voltage being greater than the upper limit of the voltage that the comparator U1 can accept.

[0069] For example, the comparator U1 is used to send a conduction signal to the switch tube Q1 when it is detected that the output voltage V_BUS of the power generation system 12 is greater than the reference voltage VREF. For example, when the switch tube Q1 is an NPN type triode, the conduction signal can be a high-level signal, and when the switch tube Q1 is a PNP type triode, the conduction signal can be a low-level signal.

[0070] In some embodiments, the switch unit 1102 is also used to disconnect the connection between the energy consumption unit 1101 and the ground according to the off signal sent by the voltage detection unit 1103 when the off signal is received. The off signal is generated when the output voltage V_BUS of the power generation system 12 is less than or equal to the reference voltage VREF.

[0071] For example, as shown in Figure 6 When the comparator U1 detects that the output voltage V_BUS of the power generation system 12 is less than or equal to the reference voltage VREF, the comparator U1 sends an off signal to the switch tube Q1, and the switch tube Q1 disconnects the connection between the energy consumption unit 1101 and the ground according to the off signal.

[0072] The above embodiment can realize timely control of the power consumption unit 1101 to stop absorbing energy when the power consumption unit 1101 completes absorbing the pulse peak energy generated by the power generation system 12, avoid absorbing too much energy, and ensure that the power generation system 12 can normally charge the battery module, by disconnecting the connection between the power consumption unit 1101 and the ground according to the shutdown signal sent by the voltage detection unit 1103 when the shutdown signal is received.

[0073] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present application, and these modifications or replacements should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A voltage control circuit, characterized by, The application is applied to a vehicle, the vehicle further comprises a power generation system, the voltage control circuit is used for connecting the power generation system, and the voltage control circuit comprises: a power consumption unit, a first end of the power consumption unit being connected with the power generation system; a switch unit, the switch unit being connected between a second end of the power consumption unit and the ground; wherein, the switch unit is used for receiving a conducting signal, enabling the power consumption unit according to the conducting signal, so that the power consumption unit absorbs the pulse peak energy generated by the power generation system, and the conducting signal is generated when the output voltage of the power generation system is greater than a preset reference voltage.

2. The voltage control circuit of claim 1, wherein, The power consumption unit comprises one or more parallel resistance branches, wherein at least one of the resistance branches comprises a first resistance connected in series.

3. The voltage control circuit of claim 1, wherein, The power consumption unit comprises an adjustable resistance, one end of the adjustable resistance being connected with the power generation system, the other end of the adjustable resistance being connected with the switch unit, and the resistance value of the adjustable resistance is positively correlated with the output voltage of the power generation system.

4. The voltage control circuit of claim 1, wherein, The power consumption unit comprises a battery heating film, a first end of the battery heating film being connected with the power generation system, and a second end of the battery heating film being connected with the switch unit.

5. The voltage control circuit of claim 1, wherein, The voltage control circuit further comprises a voltage detection unit, a first end of the voltage detection unit being connected with the power generation system, a second end of the voltage detection unit being connected with the switch unit, and a third end of the voltage detection unit being used for receiving the reference voltage, the voltage detection unit being used for sending the conducting signal to the switch unit when detecting that the output voltage of the power generation system is greater than the reference voltage.

6. The voltage control circuit of claim 5, wherein, The switch unit comprises a switch tube, a first end of the switch tube being connected with the second end of the voltage detection unit, a second end of the switch tube being connected with the second end of the power consumption unit, and a third end of the switch tube being grounded.

7. The voltage control circuit of claim 5, wherein, The voltage detection unit comprises a second resistance, a third resistance, a fourth resistance, a fifth resistance and a comparator; a first end of the second resistance is used for receiving the reference voltage, a second end of the second resistance being connected with an inverting input end of the comparator, an output end of the comparator being connected with the switch unit; a first end of the third resistance is connected with the second end of the second resistance, a second end of the third resistance being grounded, and the second resistance and the third resistance are used for voltage division of the reference voltage; a first end of the fourth resistance is used for receiving the output voltage of the power generation system, and a second end of the fourth resistance is connected with a non-inverting input end of the comparator; a first end of the fifth resistance is connected with the second end of the fourth resistance, and a second end of the fifth resistance is grounded, and the fourth resistance and the fifth resistance are used for voltage division of the output voltage.

8. The voltage control circuit of claim 5, wherein, The switch unit is further used for disconnecting the connection between the power consumption unit and the ground according to a turn-off signal sent by the voltage detection unit when receiving the turn-off signal, and the turn-off signal is generated when the output voltage of the power generation system is less than or equal to the reference voltage.

9. A voltage control device, characterized by The voltage control device comprises the voltage control circuit according to any one of claims 1-8.

10. A vehicle characterized by comprising: The vehicle includes a power generation system and the voltage control device as claimed in claim 9.

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