Power supply circuit and automobile

Abstract

The utility model relates to the technical field of vehicles, and provides a power supply circuit and an automobile, the circuit comprises a power battery, a DCDC module, a first switch, a storage battery and a power distribution module; the DCDC module is connected with the power battery and is used for converting a first power supply voltage output by the power battery into a second power supply voltage; the two ends of the first switch are connected with the DCDC module and the storage battery respectively, and the first switch is used for disconnecting the DCDC module and the storage battery when the voltage at the two ends of the first switch exceeds a preset voltage threshold value; the power distribution module is connected with the DCDC module, the storage battery, the front-drive load, the brake load, the steering load and the rear-drive load and used for providing the second power supply voltage output by the DCDC module for the front-drive load, the brake load and the steering load and further used for providing the third power supply voltage output by the storage battery for the rear-drive load. The problem that in the prior art, the power supply reliability of a vehicle braking system is not high is solved.

Description

Technical Field

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

[0002] Currently, existing technologies typically use a single power supply to power each low-voltage load separately. Braking loads are crucial to vehicle safety. If a single power supply fails, all braking loads will lose power, causing the vehicle's braking system to lose braking capacity, significantly impacting driving safety.

[0003] It can be seen that the existing technology has the problem of low power supply reliability of the vehicle braking system. Summary of the Invention

[0004] In view of the above problems, the present application provides a power supply circuit and a vehicle, which are used to solve the problem of low power supply reliability of the vehicle braking system existing in the prior art.

[0005] According to a first aspect provided by an embodiment of the present application, a power supply circuit is provided, the circuit comprising: a power battery, a DCDC module, a first switch, a storage battery, and a power distribution module; the DCDC module is connected to the power battery and is used to convert a first supply voltage output by the power battery into a second supply voltage; two ends of the first switch are respectively connected to the DCDC module and the storage battery, and are used to disconnect the connection between the DCDC module and the storage battery when the voltage across the first switch exceeds a preset voltage threshold; the power distribution module is respectively connected to the DCDC module, the storage battery, a front drive load, a braking load, a steering load, and a rear drive load, and is used to provide the second supply voltage output by the DCDC module to the front drive load, the braking load, and the steering load, and is also used to provide the third supply voltage output by the battery to the rear drive load; or, the power distribution module is used to provide the second supply voltage output by the DCDC module to the rear drive load, and is also used to provide the third supply voltage output by the storage battery to the front drive load, the braking load, and the steering load.

[0006] In an optional embodiment, when the power distribution module is used to provide the second power supply voltage output by the DCDC module to the front drive load, the braking load and the steering load, and is also used to provide the third power supply voltage output by the battery to the rear drive load, the power distribution module is also used to provide the second power supply voltage output by the DCDC module to the rear drive load; the power distribution module is also used to provide the third power supply voltage output by the battery to the front drive load, the braking load and the steering load.

[0007] In an optional embodiment, the power distribution module includes: a first power distribution unit; when the power distribution module is used to provide the second power supply voltage output by the DCDC module to the front drive load, the braking load and the steering load, the first power distribution unit is respectively connected to the DCDC module, the front drive load, the braking load and the steering load, and is used to provide the second power supply voltage output by the DCDC module to the front drive load, the braking load and the steering load; or, when the power distribution module is used to provide the second power supply voltage output by the DCDC module to the rear drive load, the first power distribution unit is respectively connected to the DCDC module and the rear drive load, and is used to provide the second power supply voltage output by the DCDC module to the rear drive load.

[0008] In an optional embodiment, the power distribution module further includes: a second power distribution unit; when the power distribution module is used to provide the third power supply voltage output by the battery to the rear-drive load, the second power distribution unit is respectively connected to the battery and the rear-drive load, and is used to provide the third power supply voltage output by the battery to the rear-drive load; or, when the power distribution module is used to provide the third power supply voltage output by the battery to the front-drive load, the braking load and the steering load, the second power distribution unit is respectively connected to the DCDC module, the front-drive load, the braking load and the steering load, and is used to provide the second power supply voltage output by the DCDC module to the front-drive load, the braking load and the steering load.

[0009] In an optional embodiment, the power distribution module includes: a first power distribution unit and a second power distribution unit; the two ends of the first power distribution unit are respectively connected to the DCDC module, the front drive load, the braking load, the steering load and the rear drive load, for providing the second power supply voltage output by the DCDC module to the front drive load, the braking load, the steering load and the rear drive load; the two ends of the second power distribution unit are respectively connected to the battery, the front drive load, the braking load, the steering load and the rear drive load, for providing the third power supply voltage output by the battery to the front drive load, the braking load, the steering load and the rear drive load.

[0010] In an optional embodiment, the power distribution module includes: a first power distribution unit, a second power distribution unit and an isolation module connected; the first power distribution unit is respectively connected to the first end of the DCDC module and the isolation module, for providing the second power supply voltage output by the DCDC module to the isolation module; the second power distribution unit is respectively connected to the second end of the battery and the isolation module, for providing the third power supply voltage output by the battery to the isolation module; the third end of the isolation module is respectively connected to the front drive load, the braking load, the steering load and the rear drive load, for providing the second power supply voltage output by the first power distribution unit and the third power supply voltage provided by the second power distribution unit to the front drive load, the braking load, the steering load and the rear drive load.

[0011] In an optional embodiment, the isolation module includes: a first isolation unit, a second isolation unit, a third isolation unit and a fourth isolation unit; each of the isolation units includes: the first diode and the second diode; the positive pole of the first diode is connected to the first power distribution unit, and the negative pole of the first diode is connected to the negative pole of the second diode; the positive pole of the second diode is connected to the second power distribution unit; the negative pole of the first diode in the first isolation unit is also connected to the front drive load; the negative pole of the first diode in the second isolation unit is also connected to the braking load; the negative pole of the first diode in the third isolation unit is also connected to the steering load; the negative pole of the first diode in the fourth isolation unit is also connected to the rear drive load.

[0012] In an optional embodiment, the DCDC module includes: a MOS transistor, a PWM controller, a third diode, an inductor, a capacitor, and a resistor; the first end of the MOS transistor is connected to the positive electrode of the power battery, the second end of the MOS transistor is connected to the PWM controller, and the third end of the MOS transistor is respectively connected to the cathode of the third diode and the first end of the inductor, and is configured to be turned on or off according to a control signal issued by the PWM controller; the anode of the third diode is connected to the negative electrode of the power battery; the second end of the inductor is respectively connected to the first end of the capacitor and the first end of the resistor; and the second end of the capacitor is respectively connected to the second end of the resistor and the cathode of the third diode.

[0013] In an optional embodiment, the power distribution module is further configured to provide the third power supply voltage output by the battery to the vehicle controller and / or the battery management module.

[0014] According to a second aspect of an embodiment of the present application, a car is provided, comprising the power supply circuit.

[0015] This application has at least the following beneficial technical effects:

[0016] The first supply voltage output by the power battery is converted into a second supply voltage by the DCDC module. The DCDC module is also used to provide the second supply voltage to the battery to charge the battery. The battery is used to output a third supply voltage. By providing the second supply voltage received by the power distribution module to the front drive load, the braking load, and the steering load, the power distribution module provides the third supply voltage output by the battery to the rear drive load. Alternatively, by providing the second supply voltage received by the power distribution module to the rear drive load, the third supply voltage output by the battery is provided to the front drive load 510, the braking load 520, and the steering load 530. This can prevent the front drive load, the braking load, the steering load, and the rear drive load from failing simultaneously when the DCDC module fails or the battery fails. For example, when the battery fails, only the third supply voltage provided to the rear drive load is powered off, and the second supply voltage output by the DCDC module is normal. The front drive load, the braking load, and the steering load are not powered off. Therefore, the vehicle will not completely lose its braking capability, and the vehicle can be braked by controlling the front drive load, the braking load, and the steering load. In the event of a DCDC module failure, the second power supply voltage provided by the DCDC module to the front-wheel drive loads, braking loads, and steering loads is disconnected. The third power supply voltage output by the battery is used to power the rear-wheel drive loads. The user can control the rear-wheel drive loads to achieve slow braking of the vehicle, preventing complete loss of braking ability. When the voltage across the first switch exceeds a preset voltage threshold, it indicates that the battery or DCDC module has failed. By providing a first switch between the DCDC module and the battery, the connection between the battery and the DCDC module is disconnected when the voltage across the first switch exceeds the preset voltage threshold, preventing interference between the faulty one and the other, further improving the reliability of the power supply circuit.

[0017] The above description is only an overview of the technical solutions of the embodiments of the present application. In order to more clearly understand the technical means of the embodiments of the present application, they can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are only used to illustrate the embodiments and are not to be considered as limiting the present application. In addition, the same reference symbols are used to represent the same components throughout the drawings. In the drawings:

[0019] Figure 1 A structural diagram of a first embodiment of a power supply circuit of a power management module provided by the present application is shown;

[0020] Figure 2A structural diagram of a second embodiment of a power supply circuit of a power management module provided by the present application is shown;

[0021] Figure 3 A structural diagram of a third embodiment of a power supply circuit of a power management module provided by the present application is shown;

[0022] Figure 4 A structural diagram of a fourth embodiment of a power supply circuit of a power management module provided by the present application is shown;

[0023] Figure 5 A structural diagram of a fifth embodiment of a power supply circuit of a power management module provided by the present application is shown;

[0024] Figure 6 A structural diagram of a sixth embodiment of a power supply circuit of a power management module provided by the present application is shown;

[0025] Figure 7 A structural diagram of a seventh embodiment of a power supply circuit of a power management module provided in the present application is shown. DETAILED DESCRIPTION

[0026] The following describes exemplary embodiments of the present application in more detail with reference to the accompanying drawings. Although the accompanying drawings show exemplary embodiments of the present application, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present application without inventive effort are within the scope of protection of this application.

[0027] If there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0028] Figure 1 The structure diagram of the first embodiment of the power supply circuit of the power management module provided by the present application is shown in FIG. Figure 1As shown, the circuit includes: a power battery 100, a DCDC module 200, a first switch K1, a storage battery 300 and a power distribution module 400;

[0029] The DCDC module 200 is connected to the power battery 100 and is used to convert the first supply voltage output by the power battery 100 into a second supply voltage;

[0030] The two ends of the first switch K1 are connected to the DCDC module 200 and the battery 300 respectively, and are used to disconnect the DCDC module 200 and the battery 300 when the voltage across the two ends of the first switch K1 exceeds a preset voltage threshold;

[0031] The power distribution module 400 is respectively connected to the DCDC module 200, the battery 300, the front drive load 510, the brake load 520, the steering load 530, and the rear drive load 540, and is used to provide the second power supply voltage output by the DCDC module 200 to the front drive load 510, the brake load 520, and the steering load 530, and is also used to provide the third power supply voltage output by the battery 300 to the rear drive load 540;

[0032] Alternatively, the power distribution module 400 is used to provide the second power supply voltage output by the DCDC module 200 to the rear drive load 540 , and is also used to provide the third power supply voltage output by the battery 300 to the front drive load 510 , the braking load 520 and the steering load 530 .

[0033] In this embodiment, the first power supply voltage output by the power battery 100 is converted into a second power supply voltage by the DCDC module 200. The DCDC module 200 is also used to provide the second power supply voltage to the battery 300 to charge the battery 300. The battery 300 is used to output a third power supply voltage. The second power supply voltage received is provided to the front drive load 510, the brake load 520 and the steering load 530 in the power distribution module 400, and the power distribution module 400 provides the third power supply voltage output by the battery 300 to the rear drive load 540. Alternatively, the second power supply voltage received is provided to the rear drive load 540 in the power distribution module 400, and the battery 300 is output. The third power supply voltage outputted from the DCDC module 200 is provided to the front drive load 510, the braking load 520, and the steering load 530, so as to prevent the front drive load 510, the braking load 520, the steering load 530, and the rear drive load 540 from failing simultaneously when the DCDC module 200 fails or the battery 300 fails. For example, when the battery 300 fails, only the third power supply voltage provided to the rear drive load 540 loses power, while the second power supply voltage outputted from the DCDC module 200 is normal, and the front drive load 510, the braking load 520, and the steering load 530 are not powered off. Therefore, the vehicle does not completely lose its braking capability, and the vehicle can be braked by controlling the front drive load 510, the braking load 520, and the steering load 530. When the DCDC module 200 fails, the second power supply voltage provided by the DCDC module 200 to the front-wheel drive load 510, the brake load 520, and the steering load 530 is powered off. The rear-wheel drive load 540 is powered by the third power supply voltage output by the battery 300. The user controls the rear-wheel drive load 540 to achieve slow braking of the vehicle, preventing the complete loss of braking ability. When the voltage across the first switch K1 exceeds a preset voltage threshold, it indicates that the battery 300 or the DCDC module 200 has failed. By providing a first switch K1 between the DCDC module 200 and the battery 300, when the voltage across the first switch K1 exceeds a preset voltage threshold, the connection between the battery 300 and the DCDC module 200 is controlled to be disconnected, preventing the faulty one from interfering with the other, further improving the reliability of the power supply circuit. It should be noted that in the embodiment of the present application, the front-wheel drive load 510, the brake load 520, the steering load 530, and the rear-wheel drive load 540 are low-voltage loads, such as a front-wheel drive controller, a brake controller, a steering controller, and a rear-wheel drive controller.

[0034] In another embodiment of the present application, when the power distribution module 400 is used to provide the second power supply voltage output by the DCDC module 200 to the front drive load 510, the brake load 520 and the steering load 530, and is also used to provide the third power supply voltage output by the battery 300 to the rear drive load, the power distribution module 400 is further used to provide the second power supply voltage output by the DCDC module 200 to the rear drive load 540;

[0035] The power distribution module 400 is further configured to provide the third power supply voltage output by the battery 300 to the front drive load 510 , the braking load 520 , and the steering load 530 .

[0036] In this embodiment, the power distribution module 400 is further configured to provide the second power supply voltage output by the DCDC module 200 to the rear-drive load 540. When the third power supply voltage provided by the battery 300 fails, the second power supply voltage provided by the DCDC module 200 can be used to power the rear-drive load 540. The power distribution module 400 is further configured to provide the third power supply voltage output by the battery 300 to the front-drive load 510, the braking load 520, and the steering load 530. When the second power supply voltage provided by the DCDC module 200 fails, the third power supply voltage provided by the battery 300 can be used to power the front-drive load 510, the braking load 520, and the steering load 530. This prevents the front-drive load 510, the rear-drive load 540, the braking load 520, and the steering load 530 from losing their braking capabilities simultaneously, thereby further improving the reliability of the power supply circuit.

[0037] Figure 2 A structural diagram of a second embodiment of a power supply circuit of a power management module provided by the present application is shown. Figure 2 As shown, the power distribution module 400 includes: a first power distribution unit 410;

[0038] When the power distribution module 400 is used to provide the second power supply voltage output by the DCDC module 200 to the front drive load 510, the braking load 520 and the steering load 530, the first power distribution unit 410 is respectively connected to the DCDC module 200, the front drive load 510, the braking load 520 and the steering load 530, and is used to provide the second power supply voltage output by the DCDC module 200 to the front drive load 510, the braking load 520 and the steering load 530.

[0039] The power distribution module 400 further includes: a second power distribution unit 420;

[0040] When the power distribution module 400 is used to provide the third power supply voltage output by the battery 300 to the rear-drive load, the second power distribution unit 420 is connected to the battery 300 and the rear-drive load 540 respectively, and is used to provide the third power supply voltage output by the battery 300 to the rear-drive load 540.

[0041] In this embodiment, the second power supply voltage output by the DCDC module 200 is specifically provided to the front drive load 510, the braking load 520 and the steering load 530 through the first power distribution unit 410, and the third power supply voltage output is specifically provided to the rear drive load 540 through the second power distribution unit 420.

[0042] Figure 3 A structural diagram of a third embodiment of a power supply circuit of a power management module provided by the present application is shown. Figure 2 As shown, the power distribution module 400 includes: a first power distribution unit 410;

[0043] When the power distribution module is used to provide the second power supply voltage output by the DCDC module 200 to the rear-drive load 540, the first power distribution unit 410 is connected to the DCDC module and the rear-drive load 540 respectively, and is used to provide the second power supply voltage output by the DCDC module to the rear-drive load 540.

[0044] The power distribution module 400 further includes: a second power distribution unit 420;

[0045] When the power distribution module 400 is used to provide the third power supply voltage output by the battery 300 to the front drive load 510, the braking load 520 and the steering load 530, the second power distribution unit 420 is respectively connected to the DCDC module 200, the front drive load 510, the braking load 520 and the steering load 530, and is used to provide the second power supply voltage output by the DCDC module 200 to the front drive load 510, the braking load 520 and the steering load 530.

[0046] In this embodiment, the second power supply voltage output by the DCDC module 200 is provided to the rear drive load 540 specifically through the first power distribution unit 410, and the third power supply voltage output is provided to the front drive load 510, the braking load 520 and the steering load 530 specifically through the second power distribution unit 420.

[0047] Figure 4 A structural diagram of a fourth embodiment of a power supply circuit of a power management module provided by the present application is shown. Figure 4As shown, the power distribution module 400 includes: a first power distribution unit 410 and a second power distribution unit 420;

[0048] Two ends of the first power distribution unit 410 are respectively connected to the DCDC module 200, the front drive load 510, the brake load 520, the steering load 530, and the rear drive load 540, for providing the second power supply voltage output by the DCDC module 200 to the front drive load 510, the brake load 520, the steering load 530, and the rear drive load 540;

[0049] The two ends of the second power distribution unit 420 are respectively connected to the battery 300, the front drive load 510, the braking load 520, the steering load 530 and the rear drive load 540, and are used to provide the third power supply voltage output by the battery 300 to the front drive load 510, the braking load 520, the steering load 530 and the rear drive load 540.

[0050] In this embodiment, the second power supply voltage output by the DCDC module 200 is provided to the front drive load 510, the braking load 520, the steering load 530 and the rear drive load 540 through the first power distribution unit 410, and the third power supply voltage output by the battery 300 is provided to the front drive load 510, the braking load 520, the steering load 530 and the rear drive load 540 through the second power distribution unit 420; when the DCDC module 200 fails, the front drive load 510, the braking load 520, the steering load 530 and the rear drive load 540 can be powered by the third power supply voltage provided by the battery 300; when the battery 300 fails, the front drive load 510, the braking load 520, the steering load 530 and the rear drive load 540 can be powered by the second power supply voltage provided by the DCDC module 200, thereby preventing the front drive load 510, the braking load 520, the steering load 530 and the rear drive load 540 from failing at the same time, thereby improving the reliability of the power supply circuit.

[0051] Figure 5 A structural diagram of a fifth embodiment of a power supply circuit of a power management module provided by the present application is shown. Figure 5 As shown, the power distribution module 400 includes: a first power distribution unit 410, a second power distribution unit 420 and an isolation module 600 connected;

[0052] The first power distribution unit 410 is connected to the first end of the DCDC module 200 and the first end of the isolation module 600, respectively, and is used to provide the second power supply voltage output by the DCDC module 200 to the isolation module 600;

[0053] The second power distribution unit 420 is connected to the second end of the battery 300 and the isolation module 600 respectively, and is used to provide the third power supply voltage output by the battery 300 to the isolation module 600;

[0054] The third end of the isolation module 600 is respectively connected to the front drive load 510, the braking load 520, the steering load 530 and the rear drive load 540, and is used to provide the second power supply voltage output by the first power distribution unit 410 and the third power supply voltage provided by the second power distribution unit 420 to the front drive load 510, the braking load 520, the steering load 530 and the rear drive load 540.

[0055] In this embodiment, by providing an isolation module 600, when the power supply circuit of the DCDC module 200 fails, the short-circuit current generated by the power supply circuit of the DCDC module 200 is prevented from flowing into the power supply circuit of the battery 300 through the end of the second distribution unit 420 outputting the third power supply voltage, thereby preventing the short-circuit current from damaging the power supply circuit of the battery 300, thereby improving the reliability of the power supply circuit; when the power supply circuit of the battery 300 fails, the short-circuit current generated by the power supply circuit of the battery 300 is prevented from flowing into the power supply circuit of the DCDC module 200 through the end of the first distribution unit 410 outputting the second power supply voltage, thereby preventing the short-circuit current from damaging the power supply circuit of the DCDC module 200, thereby improving the reliability of the power supply circuit.

[0056] Figure 6 A sixth embodiment of the power supply circuit of a power management module provided by the present application is shown in FIG. Figure 6 As shown, the isolation module 600 includes: a first isolation unit 610, a second isolation unit 620, a third isolation unit 630 and a fourth isolation unit 640;

[0057] Each of the isolation units includes: a first diode D1 and a second diode D2;

[0058] The anode of the first diode D1 is connected to the first power distribution unit 410, and the cathode of the first diode D1 is connected to the cathode of the second diode D2;

[0059] The anode of the second diode D2 is connected to the second power distribution unit 420;

[0060] The cathode of the first diode D1 in the first isolation unit 610 is also connected to the front-drive load 510;

[0061] The cathode of the first diode D1 in the second isolation unit 620 is also connected to the braking load 520;

[0062] The cathode of the first diode D1 in the third isolation unit 630 is also connected to the steering load 530;

[0063] The cathode of the first diode D1 in the fourth isolation unit 640 is also connected to the rear-drive load 540 .

[0064] In this embodiment, each isolation unit includes a first diode D1 and a second diode D2, which are used to isolate the generated short-circuit current. For example, in the first isolation unit 610, when a short-circuit current is generated due to a fault in the power supply circuit of the battery 300, the first diode D1 is provided and conducts unidirectionally, thereby preventing the short-circuit current outputted by the second diode D2 from flowing into the first diode D1, thereby preventing the short-circuit current from flowing into the power supply circuit of the DCDC module 200, thereby isolating the short-circuit current and protecting the power supply circuit of the DCDC module 200. When a short-circuit current is generated due to a fault in the power supply circuit of the DCDC module 200, the second diode D2 is provided and conducts unidirectionally, thereby preventing the short-circuit current outputted by the first diode D1 from flowing into the second diode D2, thereby isolating the short-circuit current and protecting the power supply circuit of the battery 300. It should be noted that the operating principles of the second isolation unit 620, the third isolation unit 630, and the fourth isolation unit 640 are similar and will not be further described here.

[0065] Figure 7 A seventh embodiment of the power supply circuit of a power management module provided by the present application is shown in FIG. Figure 6 As shown, the DCDC module 200 includes: a MOS tube Q1, a PWM controller, a third diode D3, an inductor L1, a capacitor C1 and a resistor R1;

[0066] The first end of the MOS transistor Q1 is connected to the positive electrode of the power battery 100, the second end of the MOS transistor Q1 is connected to the PWM controller, and the third end of the MOS transistor Q1 is connected to the cathode of the third diode D3 and the first end of the inductor L1, respectively, and is configured to be turned on or off according to a control signal issued by the PWM controller;

[0067] The anode of the third diode D3 is connected to the cathode of the power battery 100;

[0068] The second end of the inductor L1 is connected to the first end of the capacitor C1 and the first end of the resistor R1 respectively;

[0069] The second end of the capacitor C1 is connected to the second end of the resistor R1 and the cathode of the third diode D3 respectively.

[0070] In another embodiment of the present application, when the PWM controller controls the MOS transistor Q1 to be turned on, the conduction voltage drop of the MOS transistor Q1 is ignored. At this time, the voltage across the inductor L1 remains unchanged at Vin-Vo. According to the basic equation of the inductor L1: V(t)=L*dl(t) / dt; where Vin is the voltage output by the power battery 100, that is, the first supply voltage; Vo is the voltage output by the DCDC module 200, that is, the second supply voltage.

[0071] The current of the inductor L1 will increase linearly. At this time, the forward volt-second of the inductor L1 is: V*Ton=(Vin-Vo)*Ton.

[0072] When the PWM drive MOS transistor Q1 is turned off, the current in the inductor L1 forms a loop through the third diode D3 (ignoring the diode voltage drop) and the current in the inductor L1 does not change suddenly. Similarly, the voltage across the inductor L1 remains unchanged at Vo, in the opposite direction of (Vin-Vo). The current in the inductor L1 decreases linearly. At this time, the reverse volt-second of the inductor L1 is: V*Toff=Vo*(Ts-Ton), where Ts is the PWM waveform period.

[0073] According to the voltage volt-second balance law of inductor L1, we can get: (Vin-Vo)*Ton=Vo*(Ts-Ton)

[0074] That is, Vo = D*Vin (D is the duty cycle)

[0075] This achieves conversion of the first supply voltage into the second supply voltage.

[0076] In another embodiment of the present application, the power distribution module is further configured to provide the third power supply voltage output by the battery 300 to the vehicle controller and / or the battery management module.

[0077] In this embodiment, the power distribution module is further configured to provide the third supply voltage output by the battery 300 to the vehicle controller and / or battery management module, enabling the vehicle controller and battery management module to be powered on and operate. It should be noted that the second supply voltage output by the DCDC module 200 may also be provided to the vehicle controller and / or battery management module via the power distribution module.

[0078] In another embodiment of the present application, a car is provided, comprising the above-mentioned power supply circuit to provide a second power supply voltage or a third power supply voltage to a low-voltage load of the car.

[0079] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application. Therefore, any changes or modifications made in accordance with the claims and description of the present application should fall within the scope of the patent covered by this application.

[0080] The above content is only a preferred exemplary embodiment of the present application and is not intended to limit the implementation scheme of the present application. Ordinary technicians in this field can easily make corresponding changes or modifications based on the main ideas and spirit of the present application. Therefore, the scope of protection of the present application shall be based on the scope of protection required by the claims.

Claims

1. A power supply circuit, characterized in that: The circuit includes: a power battery, a DCDC module, a first switch, a storage battery and a power distribution module; The DCDC module is connected to the power battery and is used to convert the first power supply voltage output by the power battery into a second power supply voltage; The two ends of the first switch are respectively connected to the DCDC module and the battery, and are used to disconnect the connection between the DCDC module and the battery when the voltage across the two ends of the first switch exceeds a preset voltage threshold; The power distribution module is respectively connected to the DCDC module, the battery, the front drive load, the brake load, the steering load and the rear drive load, and is used to provide the second power supply voltage output by the DCDC module to the front drive load, the brake load and the steering load, and is also used to provide the third power supply voltage output by the battery to the rear drive load; Alternatively, the power distribution module is used to provide the second power supply voltage output by the DCDC module to the rear drive load, and is also used to provide the third power supply voltage output by the battery to the front drive load, the braking load and the steering load.

2. A power supply circuit according to claim 1, characterized in that: When the power distribution module is used to provide the second power supply voltage output by the DCDC module to the front drive load, the braking load and the steering load, and is also used to provide the third power supply voltage output by the battery to the rear drive load, the power distribution module is also used to provide the second power supply voltage output by the DCDC module to the rear drive load; the power distribution module is also used to provide the third power supply voltage output by the battery to the front drive load, the braking load and the steering load.

3. The power supply circuit according to claim 1, characterized in that: The power distribution module includes: a first power distribution unit; When the power distribution module is used to provide the second power supply voltage output by the DCDC module to the front drive load, the brake load and the steering load, the first power distribution unit is connected to the DCDC module, the front drive load, the brake load and the steering load respectively, and is used to provide the second power supply voltage output by the DCDC module to the front drive load, the brake load and the steering load; Alternatively, when the power distribution module is used to provide the second power supply voltage output by the DCDC module to the rear-drive load, the first power distribution unit is respectively connected to the DCDC module and the rear-drive load, and is used to provide the second power supply voltage output by the DCDC module to the rear-drive load.

4. A power supply circuit according to claim 3, characterized in that: The power distribution module further includes: a second power distribution unit; When the power distribution module is used to provide the third power supply voltage output by the battery to the rear-drive load, the second power distribution unit is connected to the battery and the rear-drive load respectively, and is used to provide the third power supply voltage output by the battery to the rear-drive load; Alternatively, when the power distribution module is used to provide the third power supply voltage output by the battery to the front drive load, the braking load and the steering load, the second power distribution unit is respectively connected to the DCDC module, the front drive load, the braking load and the steering load, and is used to provide the second power supply voltage output by the DCDC module to the front drive load, the braking load and the steering load.

5. The power supply circuit according to claim 2, characterized in that: The power distribution module includes: a first power distribution unit and a second power distribution unit; The two ends of the first power distribution unit are respectively connected to the DCDC module, the front drive load, the brake load, the steering load and the rear drive load, and are used to provide the second power supply voltage output by the DCDC module to the front drive load, the brake load, the steering load and the rear drive load; The two ends of the second power distribution unit are respectively connected to the battery, the front drive load, the braking load, the steering load and the rear drive load, and are used to provide the third power supply voltage output by the battery to the front drive load, the braking load, the steering load and the rear drive load.

6. A power supply circuit according to claim 2, characterized in that: The power distribution module includes: a first power distribution unit, a second power distribution unit and an isolation module connected; The first power distribution unit is connected to the first end of the DCDC module and the isolation module respectively, and is used to provide the second power supply voltage output by the DCDC module to the isolation module; The second power distribution unit is connected to the second end of the battery and the isolation module respectively, and is used to provide the third power supply voltage output by the battery to the isolation module; The third end of the isolation module is respectively connected to the front drive load, the braking load, the steering load and the rear drive load, and is used to provide the second power supply voltage output by the first power distribution unit and the third power supply voltage provided by the second power distribution unit to the front drive load, the braking load, the steering load and the rear drive load.

7. A power supply circuit according to claim 6, characterized in that: The isolation module includes: a first isolation unit, a second isolation unit, a third isolation unit and a fourth isolation unit; Each of the isolation units includes: a first diode and a second diode; The anode of the first diode is connected to the first power distribution unit, and the cathode of the first diode is connected to the cathode of the second diode; The anode of the second diode is connected to the second power distribution unit; The cathode of the first diode in the first isolation unit is also connected to the front drive load; The cathode of the first diode in the second isolation unit is also connected to the braking load; The cathode of the first diode in the third isolation unit is also connected to the steering load; The cathode of the first diode in the fourth isolation unit is also connected to the rear-drive load.

8. The power supply circuit according to claim 2, characterized in that: The DCDC module includes: a MOS tube, a PWM controller, a third diode, an inductor, a capacitor and a resistor; The first end of the MOS transistor is connected to the positive electrode of the power battery, the second end of the MOS transistor is connected to the PWM controller, and the third end of the MOS transistor is connected to the cathode of the third diode and the first end of the inductor respectively, and is configured to be turned on or off according to a control signal sent by the PWM controller; The positive electrode of the third diode is connected to the negative electrode of the power battery; The second end of the inductor is connected to the first end of the capacitor and the first end of the resistor respectively; The second end of the capacitor is connected to the second end of the resistor and the cathode of the third diode respectively.

9. The power supply circuit according to claim 1, characterized in that: The power distribution module is also used to provide the third power supply voltage output by the battery to the vehicle controller and / or the battery management module.

10. An automobile, characterized in that: A power supply circuit comprising any one of claims 1 to 9.

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