Power supply system and vehicle

Abstract

The present invention provides a power supply system comprising: a power module, a battery management unit, a control unit, and a field-effect transistor (FET), wherein the control unit is configured to control the field-effect transistor to remain connected when the voltage of the power module decreases or increases; a first input terminal of the battery management unit is connected to the positive electrode of the power module, and a second input terminal of the battery management unit is connected to the negative electrode of the power module; a first input terminal of the control unit is connected to the positive electrode of the power module, a second input terminal of the control unit is connected to the output terminal of the battery management unit, and the output terminal of the control unit is connected to the gate of the field-effect transistor; the positive electrode of the power module is connected to the drain of the field-effect transistor, the source of the field-effect transistor is connected to the input terminal of a vehicle power system, and the output terminal of the vehicle power system is connected to the negative electrode of the power module. In an embodiment of the present invention, the control unit enables the power module to maintain the connection of the field-effect transistor when the voltage fluctuates, thereby reducing the possibility of abnormal disconnection between the control circuit and the power system.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a vehicle power supply system and a vehicle Background Art

[0002] A vehicle's power system is part of its drive system, used to power electrical equipment whose operating voltage is incompatible with the vehicle's main power battery. In related art, due to the fast switching speed of field-effect transistors (FETs), using them to connect or disconnect the power system effectively provides short-circuit protection. However, due to the narrow operating voltage range of FETs in related art, if the output of the drive battery fluctuates, the power supply system will disconnect, causing the power system to malfunction.

[0003] It can be seen that the related art has the problem that the power supply system of the vehicle power system is easily disconnected. Summary of the Invention

[0004] The embodiments of the present invention provide a vehicle power supply system and a vehicle to solve the problem in the related art that the control circuit is easily disconnected.

[0005] To achieve the above-mentioned purpose, an embodiment of the present invention provides a vehicle power supply system, comprising: a power module, a battery management unit, a control unit and a field effect transistor, wherein:

[0006] The control unit is used to control the field effect transistor to remain connected when the voltage of the power module decreases or increases;

[0007] The first input terminal of the battery management unit is connected to the positive electrode of the power module, and the second input terminal of the battery management unit is connected to the negative electrode of the power module;

[0008] The first input end of the control unit is connected to the positive electrode of the power module, the second input end of the control unit is connected to the output end of the battery management unit, and the output end of the control unit is connected to the gate of the field effect transistor;

[0009] The positive electrode of the power module is connected to the drain of the field effect tube, the source of the field effect tube is connected to the input end of the vehicle power system, and the output end of the vehicle power system is connected to the negative electrode of the power module.

[0010] As an optional implementation, the control unit includes a voltage stabilizing chip and a voltage boosting chip, wherein:

[0011] The output end of the battery management unit is connected to the enable end of the voltage stabilizing chip, and the output end of the battery management unit is also connected to the enable end of the boost chip;

[0012] The first input end of the voltage stabilizing chip is connected to the positive electrode of the power module, and the output end of the voltage stabilizing chip is connected to the gate of the field effect tube;

[0013] The first input end of the boost chip is connected to the positive electrode of the power module, and the output end of the boost chip is connected to the gate of the field effect tube.

[0014] As an optional implementation, the control unit further includes a first diode and a second diode, wherein:

[0015] The output end of the voltage stabilizing chip is connected to the input end of the first diode, and the output end of the first diode is connected to the gate of the field effect transistor;

[0016] The output end of the boost chip is connected to the input end of the second diode, and the output end of the second diode is connected to the gate of the field effect transistor.

[0017] As an optional implementation, the control circuit further includes a third diode, wherein:

[0018] The input end of the third diode is connected to the source of the field effect tube, and the output end of the third diode is connected to the gate of the field effect tube.

[0019] As an optional implementation, the control unit further includes an inductor and a first capacitor, wherein:

[0020] The first end of the inductor is connected to the positive electrode of the power module, and the second end of the inductor is connected to the switch end of the voltage regulator chip;

[0021] The first end of the first capacitor is connected to the second end of the inductor, and the second end of the first capacitor is connected to the boost terminal of the voltage stabilizing chip.

[0022] As an optional implementation, the control unit further includes a first resistor, a second resistor and a second capacitor, wherein:

[0023] The first end of the first resistor is connected to the output end of the voltage stabilizing chip, and the second end of the first resistor is connected to the feedback end of the voltage stabilizing chip;

[0024] A first end of the second resistor is connected to the feedback end of the voltage stabilizing chip, and a second end of the second resistor is connected to the ground line;

[0025] A first end of the second capacitor is connected to an output end of the voltage stabilizing chip, and a second end of the second capacitor is connected to a feedback end of the voltage stabilizing chip.

[0026] As an optional implementation, the control unit further includes a third resistor, a first end of the third resistor is connected to the variable resistor end of the voltage stabilizing chip, and a second end of the third resistor is connected to the ground line.

[0027] As an optional implementation, the control unit further includes a third capacitor and a fourth capacitor, wherein:

[0028] A first end of the third capacitor is connected to the positive electrode of the power module, and a second end of the third capacitor is connected to the first input end of the boost chip;

[0029] The first end of the fourth capacitor is connected to the positive electrode of the power module, the second end of the fourth capacitor is connected to the second input end of the boost chip, and the second input end of the boost chip is connected to the positive electrode of the power module.

[0030] As an optional implementation, the control unit further includes a fourth resistor and a fifth resistor, wherein:

[0031] A first end of the fourth resistor is connected to the output end of the boost chip, and a second end of the fourth resistor is connected to the feedback end of the boost chip;

[0032] A first end of the fifth resistor is connected to the feedback end of the boost chip, and a second end of the fifth resistor is connected to the ground line.

[0033] An embodiment of the present invention further provides a vehicle, comprising the above-mentioned vehicle power supply system.

[0034] One of the above technical solutions has the following advantages or beneficial effects:

[0035] In an embodiment of the present invention, a control unit is used to enable the power module to maintain the connectivity of the field-effect transistor when the voltage fluctuates, thereby reducing the possibility of abnormal disconnection between the control circuit and the power system; at the same time, the battery management unit is used to enable the power module to send a signal to the control unit in the event of a short circuit, and the control unit can effectively disconnect the field-effect transistor to avoid damage to the vehicle's power system or the power module. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in describing the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0037] Figure 1 This is a schematic diagram of a vehicle power supply system provided by an embodiment of the present invention;

[0038] Figure 2 is a schematic diagram of another vehicle power supply system provided by an embodiment of the present invention;

[0039] Figure 3 This is a schematic diagram of another vehicle power supply system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0041] See Figure 1 ,like Figure 1 As shown, an embodiment of the present invention provides a vehicle power supply system, including: a power module 101, a battery management unit U1, a control unit 102 and a field effect transistor Q, wherein:

[0042] The control unit 102 is used to control the field effect transistor Q to remain connected when the voltage of the power module 101 decreases or increases;

[0043] The first input terminal of the battery management unit U1 is connected to the positive electrode of the power module 101, and the second input terminal of the battery management unit U1 is connected to the negative electrode of the power module 101;

[0044] The first input terminal of the control unit 102 is connected to the positive electrode of the power module 101, the second input terminal of the control unit 102 is connected to the output terminal of the battery management unit U1, and the output terminal of the control unit 102 is connected to the gate of the field effect transistor Q;

[0045] The positive electrode of the power module 101 is connected to the drain of the field effect transistor Q, the source of the field effect transistor Q is connected to the input end of the vehicle power system, and the output end of the vehicle power system is connected to the negative electrode of the power module 101.

[0046] In this embodiment, the control unit 102 is used to enable the power module 101 to maintain the connectivity of the field effect transistor Q when the voltage fluctuates, thereby reducing the possibility of abnormal disconnection between the control circuit and the power system; at the same time, the battery management unit U1 is used to enable the power module 101 to send a signal to the control unit 102 in the event of a short circuit, and the control unit 102 can effectively disconnect the field effect transistor Q to avoid damage to the vehicle's power system or the power module 101.

[0047] Among them, when the power module 101 is normal, the battery management unit U1 sends an enable signal to the control unit 102. After receiving the enable signal, the control unit 102 controls the difference between the voltage at the output end of the control unit 102 and the voltage of the power module 101 to be greater than the connection limit of the field effect transistor Q when the voltage of the power module 101 decreases or increases, which can effectively maintain the conduction between the source and drain of the field effect transistor Q, so that the vehicle power system and the control circuit can remain connected when the power module 101 fluctuates.

[0048] As an optional implementation, Figure 2 As shown, the control unit 102 includes a voltage stabilizing chip U2 and a voltage boosting chip U3, wherein:

[0049] The output end of the battery management unit U1 is connected to the enable end of the voltage regulator chip U2, and the output end of the battery management unit U1 is also connected to the enable end of the boost chip U3;

[0050] The first input terminal of the voltage stabilizing chip U2 is connected to the positive electrode of the power module 101, and the output terminal of the voltage stabilizing chip U2 is connected to the gate of the field effect transistor Q;

[0051] The first input end of the boost chip U3 is connected to the positive electrode of the power module 101 , and the output end of the boost chip U3 is connected to the gate of the field effect transistor Q.

[0052] In this embodiment, the voltage regulator chip U2 can maintain the conduction of the field effect transistor Q when the voltage of the power module 101 drops, and the boost chip U3 can maintain the conduction of the field effect transistor Q when the voltage of the power module 101 rises, so that the control unit 102 can effectively maintain the conduction of the field effect transistor Q when the voltage of the power module 101 drops or rises, thereby avoiding the abnormal disconnection between the vehicle power system and the control circuit.

[0053] In this embodiment of the present invention, the operating voltage range of the power module 101 is 9-18V. The output voltage of the voltage regulator chip U2 is a fixed value, and the output voltage of the boost chip U3 is a fixed multiple of the input voltage. For example, if the input voltage of the power module 101 is 12V, the output voltage of the voltage regulator chip U2 is set to 24V, and the amplification factor of the boost chip U3 is 1.5 times, that is, the output voltage of the boost chip U3 is 18V. The turn-on threshold of the field-effect transistor Q is set to 6V. That is, when the difference between the gate voltage and the source voltage of the field-effect transistor Q is greater than the turn-on threshold, the field-effect transistor Q can conduct the drain and source, thereby controlling the connection between the control circuit and the vehicle power system. At this time, since the output voltage of the voltage regulator chip U2 is 24V and the output voltage of the boost chip U3 is 18V, the field-effect transistor Q can be effectively turned on.

[0054] In addition, when the voltage of the power module 101 is disturbed and rises, assuming that the instantaneous voltage is 20V at this time, the output voltage of the voltage regulator chip U2 is still 24V, which cannot effectively drive the field effect transistor Q to turn on; but at this time the output voltage of the boost chip U3 is 30V, and the voltage difference with the power module 101 is still greater than the turn-on threshold value of the field effect transistor Q, which can effectively drive the field effect transistor Q to turn on, thereby achieving the control circuit and the vehicle power system to remain turned on when the voltage of the power module 101 rises due to interference.

[0055] In addition, when the voltage of the power module 101 is disturbed and reduced, assuming that the instantaneous voltage is 6V at this time, the output voltage of the boost chip U3 becomes 9V, which cannot effectively drive the field effect transistor Q to turn on; but at this time, the output voltage of the voltage regulator chip U2 is still 24V, and the voltage difference with the power module 101 is still greater than the turn-on threshold value of the field effect transistor Q, which can effectively drive the field effect transistor Q to turn on, thereby achieving the control circuit and the vehicle power system to remain turned on when the voltage of the power module 101 is reduced due to interference.

[0056] As an optional implementation, the control unit 102 further includes a first diode D1 and a second diode D2, wherein:

[0057] The output end of the voltage stabilizing chip U2 is connected to the input end of the first diode D1, and the output end of the first diode D1 is connected to the gate of the field effect transistor Q;

[0058] The output end of the boost chip U3 is connected to the input end of the second diode D2 , and the output end of the second diode D2 is connected to the gate of the field effect transistor Q.

[0059] In this embodiment, the output end of the voltage regulator chip U2 is connected to the input end of the first diode D1, and the output end of the boost chip U3 is connected to the input end of the second diode D2, so as to prevent the current from being diverted when there is a difference in the voltage of the voltage regulator chip U2 and the boost chip U3 when the power module 101 changes, thereby protecting the voltage regulator chip U2 and the boost chip U3.

[0060] As an optional embodiment, the control circuit further includes a third diode D3, wherein:

[0061] An input end of the third diode D3 is connected to the source of the field effect transistor Q, and an output end of the third diode D3 is connected to the gate of the field effect transistor Q.

[0062] In this embodiment, the input end of the third diode D3 is connected to the source of the field effect transistor Q, and the output end of the third diode D3 is connected to the gate of the field effect transistor Q to prevent backflow when the voltage of the power module 101 fluctuates, thereby protecting the control circuit from damage caused by backflow.

[0063] As an optional implementation, Figure 3 As shown, the control unit 102 further includes an inductor L and a first capacitor C1, wherein:

[0064] The first end of the inductor L is connected to the positive electrode of the power module 101, and the second end of the inductor L is connected to the switch end of the voltage regulator chip U2;

[0065] A first end of the first capacitor C1 is connected to the second end of the inductor L, and a second end of the first capacitor C1 is connected to the boost terminal of the voltage stabilizing chip U2.

[0066] In this embodiment, the inductor L and the first capacitor C1 can stabilize the output voltage of the battery, wherein the inductor L can generate an induced current that maintains the voltage unchanged when the voltage at the input end changes, and the first capacitor C1 stores or discharges energy according to the direction of the induced current to maintain the voltage stability of the output end of the voltage regulator chip U2.

[0067] In the embodiment of the present invention, the value of the inductor L is 15 μH, and the value of the first capacitor C1 is 0.1 μF.

[0068] As an optional implementation, the control unit 102 further includes a first resistor R1, a second resistor R2, and a second capacitor C2, wherein:

[0069] A first end of the first resistor R1 is connected to the output end of the voltage stabilizing chip U2, and a second end of the first resistor R1 is connected to the feedback end of the voltage stabilizing chip U2;

[0070] A first end of the second resistor R2 is connected to the feedback end of the voltage stabilizing chip U2, and a second end of the second resistor R2 is connected to the ground line;

[0071] A first end of the second capacitor C2 is connected to the output end of the voltage stabilizing chip U2 , and a second end of the second capacitor C2 is connected to the feedback end of the voltage stabilizing chip U2 .

[0072] In this embodiment, the first resistor R1, the second resistor R2 and the second capacitor C2 are feedback devices for the output voltage of the voltage regulator chip U2. The voltage regulator chip U2 can maintain the output voltage within a set range through feedback control of the first resistor R1, the second resistor R2 and the second capacitor C2.

[0073] In the embodiment of the present invention, the first resistor R1 is 1M, the second resistor R2 is 37K, and the second capacitor C2 is 4.7 μF.

[0074] As an optional implementation, the control unit 102 further includes a third resistor R3 , a first end of the third resistor R3 is connected to the variable resistor end of the voltage regulator chip U2 , and a second end of the third resistor R3 is connected to the ground line.

[0075] In this embodiment, the frequency of the voltage regulator chip U2 can be adjusted by connecting the first end of the third resistor R3 to the variable resistor end of the voltage regulator chip U2 and the second end of the third resistor R3 to the ground line. In this embodiment of the present invention, the value of the third resistor R3 is 102K and the frequency is 1MHz.

[0076] In addition, one end of the seventh capacitor C7 and the eighth capacitor C8 are respectively connected to the output end of the voltage stabilizing chip U2, and the other ends of the seventh capacitor C7 and the eighth capacitor C8 are connected to the ground line. The seventh capacitor C7 and the eighth capacitor C8 are used for filtering the output end of the voltage stabilizing chip U2, wherein the size of the seventh capacitor C7 is 1μF, and the size of the eighth capacitor C8 is 10μF.

[0077] As an optional implementation, the control unit 102 further includes a third capacitor C3 and a fourth capacitor C4, wherein:

[0078] A first end of the third capacitor C3 is connected to the positive electrode of the power module 101, and a second end of the third capacitor C3 is connected to the first input end of the boost chip U3;

[0079] A first end of the fourth capacitor C4 is connected to the positive electrode of the power module 101 , a second end of the fourth capacitor C4 is connected to the second input end of the boost chip U3 , and the second input end of the boost chip U3 is connected to the positive electrode of the power module 101 .

[0080] In this embodiment, the third capacitor C3 and the fourth capacitor C4 are used for filtering and stabilizing the voltage at the input of the boost chip U3, so that the voltage at the first input of the boost chip U3 remains within a stable range. The third capacitor C3 is 10 μF, and the fourth capacitor C4 is 10 μF.

[0081] In addition, one end of a fifth capacitor C5 is connected to the first input terminal of the voltage regulator chip U2, and the other end of the fifth capacitor C5 is connected to the ground line. The fifth capacitor C5 also performs filtering and voltage stabilization functions, maintaining the voltage at the first input terminal of the voltage regulator chip U2 within a stable range. The capacitance of the fifth capacitor C5 is 10μF.

[0082] As an optional implementation, the control unit 102 further includes a fourth resistor R4 and a fifth resistor R5, wherein:

[0083] A first end of the fourth resistor R4 is connected to the output end of the boost chip U3, and a second end of the fourth resistor R4 is connected to the feedback end of the boost chip U3;

[0084] A first end of the fifth resistor R5 is connected to the feedback end of the boost chip U3 , and a second end of the fifth resistor R5 is connected to the ground line.

[0085] In this embodiment, the fourth resistor R4 and the fifth resistor R5 function similarly to the first resistor R1 and the second resistor R2. The fourth resistor R4 and the fifth resistor R5 are used to provide feedback to the voltage at the output of the boost chip U3, ensuring that the output voltage of the boost chip U3 is within a set value range. In this embodiment of the present invention, the fourth resistor R4 has a resistance of 1M, and the fifth resistor R5 has a resistance of 37K.

[0086] In addition, the embodiment of the present invention also includes a sixth capacitor C6, a ninth capacitor C9, a tenth capacitor C10, and an eleventh capacitor C11. The sixth capacitor C6 and the tenth capacitor C10 are used for filtering the chip's internal circuits, the eleventh capacitor C11 is used for filtering the chip's output, and the ninth capacitor C9 is used to carry charge and increase voltage. The sixth capacitor C6 is 1 μF, the ninth capacitor C9 is 1 μF, the tenth capacitor C10 is 4.7 μF, and the eleventh capacitor C11 is 10 μF.

[0087] An embodiment of the present invention further provides a vehicle, which includes the above-mentioned vehicle power supply system.

[0088] It should be noted that the implementation method of the above-mentioned vehicle power supply system embodiment is also applicable to the embodiment of this vehicle and can achieve the same technical effect, which will not be repeated here.

[0089] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0090] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are protected by the present invention.

Claims

1. A power supply system, characterized in that: include: Power module, battery management unit, control unit and field effect transistor, among which, The control unit controls the field effect transistor to remain connected when the voltage of the power module decreases or increases; The first input terminal of the battery management unit is connected to the positive electrode of the power module, and the second input terminal of the battery management unit is connected to the negative electrode of the power module; The first input end of the control unit is connected to the positive electrode of the power module, the second input end of the control unit is connected to the output end of the battery management unit, and the output end of the control unit is connected to the gate of the field effect tube. The control unit includes a voltage stabilizing chip and a boost chip, wherein the output end of the battery management unit is connected to the enable end of the voltage stabilizing chip, and the output end of the battery management unit is also connected to the enable end of the boost chip; the first input end of the voltage stabilizing chip is connected to the positive electrode of the power module, and the output end of the voltage stabilizing chip is connected to the gate of the field effect tube; the first input end of the boost chip is connected to the positive electrode of the power module, and the output end of the boost chip is connected to the gate of the field effect tube. The control unit also includes a first diode and a second diode, wherein the output end of the voltage stabilizing chip is connected to the input end of the first diode, and the output end of the first diode is connected to the gate of the field effect tube; the output end of the boost chip is connected to the input end of the second diode, and the output end of the second diode is connected to the gate of the field effect tube; The positive electrode of the power module is connected to the drain of the field effect tube, the source of the field effect tube is connected to the input end of the vehicle power system, and the output end of the vehicle power system is connected to the negative electrode of the power module.

2. The power supply system according to claim 1, characterized in that: The power supply system further includes a third diode, wherein: The input end of the third diode is connected to the source of the field effect tube, and the output end of the third diode is connected to the gate of the field effect tube.

3. The power supply system according to claim 2, characterized in that: The control unit further includes an inductor and a first capacitor, wherein: The first end of the inductor is connected to the positive electrode of the power module, and the second end of the inductor is connected to the switch end of the voltage regulator chip; The first end of the first capacitor is connected to the second end of the inductor, and the second end of the first capacitor is connected to the boost terminal of the voltage stabilizing chip.

4. The power supply system according to claim 3, characterized in that: The control unit further includes a first resistor, a second resistor and a second capacitor, wherein: The first end of the first resistor is connected to the output end of the voltage stabilizing chip, and the second end of the first resistor is connected to the feedback end of the voltage stabilizing chip; A first end of the second resistor is connected to the feedback end of the voltage stabilizing chip, and a second end of the second resistor is connected to the ground line; A first end of the second capacitor is connected to an output end of the voltage stabilizing chip, and a second end of the second capacitor is connected to a feedback end of the voltage stabilizing chip.

5. The power supply system according to claim 4, characterized in that: The control unit further includes a third resistor, a first end of the third resistor is connected to the variable resistor end of the voltage stabilizing chip, and a second end of the third resistor is connected to the ground line.

6. The power supply system according to claim 2, characterized in that: The control unit further includes a third capacitor and a fourth capacitor, wherein: A first end of the third capacitor is connected to the positive electrode of the power module, and a second end of the third capacitor is connected to the first input end of the boost chip; The first end of the fourth capacitor is connected to the positive electrode of the power module, the second end of the fourth capacitor is connected to the second input end of the boost chip, and the second input end of the boost chip is connected to the positive electrode of the power module.

7. The power supply system according to claim 6, characterized in that: The control unit further includes a fourth resistor and a fifth resistor, wherein: A first end of the fourth resistor is connected to the output end of the boost chip, and a second end of the fourth resistor is connected to the feedback end of the boost chip; A first end of the fifth resistor is connected to the feedback end of the boost chip, and a second end of the fifth resistor is connected to the ground line.

8. A vehicle, characterized in that: The vehicle comprises the power supply system according to any one of claims 1 to 7.

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