Power supply system and vehicle

Abstract

The embodiment of the application relates to the technical field of vehicle power management, and discloses a power supply system and a vehicle, the power supply system comprising: a voltage converter, a capacitor module and a controller; wherein an input end of the voltage converter is used for connecting a power supply, an electric energy output end of the voltage converter is connected with a first end of the capacitor module and a power supply end of the controller respectively, and the controller is configured to: acquire indication information of the voltage converter, the indication information being related to a first voltage output by the electric energy output end of the voltage converter; acquire a second voltage input by the input end of the voltage converter; and control the voltage converter to reset according to the indication information and the second voltage. By applying the technical scheme of the application, the working states of the power supply and the voltage converter can be monitored and diagnosed, and failure control can be timely taken when the power supply or the voltage converter fails, so that the robustness of the power supply control system is improved.

Description

Technical Field

[0001] This application relates to the field of vehicle power management technology, specifically to a power system and vehicle technology. Background Technology

[0002] With the rapid development of vehicle electrification, intelligence, connectivity and autonomous driving, vehicles are using more and more electrical devices, the computing power required by chips is constantly increasing, and the power demand of drive motors and loads in drive-by-wire systems is also increasing. Traditional 12V low-voltage power supply systems can hardly bear such huge energy consumption demands, so it is necessary to increase the voltage of the vehicle's low-voltage power supply system.

[0003] For control modules in low-voltage power supply systems, mature control modules (e.g., control chips) are typically used. The solution is simply to add a voltage converter to step down the boosted voltage from the low-voltage power supply system to a conventional voltage to power the mature control module. However, adding a voltage converter introduces a new failure risk: the voltage converter may malfunction, increasing safety risks during vehicle operation. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this application is to provide a power system and vehicle that aims to reduce the safety risks of the vehicle during operation.

[0005] In a first aspect, embodiments of this application provide a power supply system. The power supply system includes a voltage converter, a capacitor module, and a controller. The input terminal of the voltage converter is connected to a power supply, and the power output terminal of the voltage converter is connected to a first terminal of the capacitor module and a power supply terminal of the controller. The controller is configured to: acquire indication information from the voltage converter, the indication information being related to a first voltage output from the power output terminal of the voltage converter; acquire a second voltage input to the input terminal of the voltage converter; and control the voltage converter to reset based on the indication information and the second voltage.

[0006] In this embodiment, the controller determines the state of the voltage converter by acquiring the indication information output by the voltage converter. When the controller determines that the indication information output by the voltage converter indicates a fault, it further determines the operating state of the power supply by acquiring the output voltage of the power supply. If the power supply is in normal operating condition, the controller controls the voltage converter to reset. During the voltage converter reset phase, the capacitor module supplies power to the controller, satisfying the controller's subsequent monitoring of the voltage converter and the power supply. Thus, the state monitoring and diagnosis of the voltage converter are realized, and in the event of a voltage converter failure, failure control is implemented, i.e., resetting the voltage converter so that the power system can return to normal operating condition, thereby reducing the safety risks during vehicle operation.

[0007] In one possible implementation, the controller includes a first detection terminal, a second detection terminal, and a first control terminal; the voltage converter includes a signal output terminal and a reset terminal; the first detection terminal of the controller is connected to the signal output terminal of the voltage converter, and the second detection terminal of the controller is connected to the input terminal of the voltage converter; the first control terminal of the controller is connected to the reset terminal of the voltage converter; the controller is configured to: receive first indication information output by the signal output terminal of the voltage converter, the first indication information indicating that the first voltage is less than the lower limit of a first preset voltage range or greater than the upper limit of the first preset voltage range; determine the relationship between the second voltage and the second preset voltage range in response to the first indication information; and output a reset signal to the voltage converter through the first control terminal in response to the second voltage being within the second preset voltage range, the reset signal being used to control the voltage converter to reset.

[0008] In this embodiment, the voltage converter internally determines the output voltage. If the output voltage is less than the lower limit of a first preset voltage range or greater than the upper limit of the first preset range, it outputs a first indication of a fault state to the controller. After receiving the first indication, the controller further determines the power supply status based on the input voltage of the voltage converter. If the power supply is in normal operating condition, the controller resets the voltage converter. Thus, when the voltage converter fails, failure control is implemented, i.e., resetting the voltage converter allows the power system to return to normal operating condition.

[0009] In one possible implementation, the controller includes a second detection terminal, a third detection terminal, and a first control terminal, and the voltage converter includes a reset terminal; the third detection terminal of the controller is connected to the power output terminal of the voltage converter, and the second detection terminal of the controller is connected to the input terminal of the voltage converter; the first control terminal of the controller is connected to the reset terminal of the voltage converter, and the controller is configured to: acquire indication information from the voltage converter, the indication information indicating the value of a first voltage; determine the relationship between a second voltage and a second preset voltage range in response to the indication information indicating that the value of the first voltage is less than the lower limit of a first preset voltage range or greater than the upper limit of the first preset voltage range; and output a reset signal to the voltage converter through the first control terminal in response to the second voltage being within the second preset voltage range, the reset signal being used to control the voltage converter to reset.

[0010] In this embodiment, the controller determines the operating status of the voltage converter by acquiring its output voltage. If the acquired output voltage is less than the lower limit of a first preset voltage range or greater than the upper limit of the first preset voltage range, the controller determines that the voltage converter is in a fault state. Then, the controller determines the status of the power supply by measuring the input voltage of the voltage converter. If the power supply is in a normal operating state, the controller resets the voltage converter. Therefore, when the voltage converter fails, failure control is implemented, i.e., resetting the voltage converter allows the power system to return to normal operation.

[0011] In one possible implementation, the controller further includes a second control terminal connected to a second terminal of the capacitor module. The controller is further configured to: in response to a second voltage not being within a second preset voltage range, control the voltage converter to stop operating via the first control terminal and control the capacitor module to discharge via the second control terminal. Thus, when the controller determines that the voltage converter failure is caused by a power supply failure, it controls the voltage converter to stop operating, protecting the integrity of other load functional devices. Simultaneously, since the voltage inside the capacitor module will keep the power system circuit at a high level, controlling the capacitor module to discharge ensures that the power system is in a low-level reset state before the next power-on, guaranteeing normal controller startup.

[0012] In one possible implementation, the controller is further configured to: control the voltage converter to stop working and control the capacitor module to discharge when the number of output resets is greater than or equal to a preset reset threshold. If the voltage converter remains in a faulty state after a certain number of resets, the controller controls the voltage converter to stop working, thereby protecting the integrity of the functions of each component in the power supply system.

[0013] In one possible implementation, the controller is further configured to discharge the capacitor module in response to a power-down. During normal operation of the power system, the capacitor module stores electrical energy to provide power to the controller during subsequent voltage converter resets. However, after power-down, the voltage inside the capacitor module keeps the power system circuit at a high level. Therefore, discharging the capacitor module ensures the power system is in a low-level reset state before the next power-up, thus guaranteeing normal controller startup.

[0014] In one possible implementation, the capacitor module includes a capacitor circuit and a discharge circuit. The discharge circuit is connected to the capacitor circuit, and the capacitor circuit is connected to a first terminal of the capacitor module. The discharge circuit is configured to: discharge the capacitor circuit in response to a control signal from the controller; and stop discharging the capacitor circuit when the voltage signal of the capacitor circuit is less than a preset voltage value. In this embodiment, the controller outputs a control signal to the discharge circuit to control the discharge circuit to discharge the capacitor circuit, thereby ensuring that the controller starts normally when the power system is powered on next time. Simultaneously, when the power system is powered off, the discharge circuit stops discharging the capacitor circuit when the capacitor circuit voltage drops to a preset voltage value, preventing irreversible damage caused by over-discharge of the capacitor circuit. This achieves the function of stopping the discharge of the capacitor circuit without relying on the controller.

[0015] In one possible implementation, the bleeder circuit includes a first transistor, a second transistor, a third transistor, a reset / set (RS) flip-flop, a first inverter, a set signal terminal, a reset signal terminal, a first diode, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor. The first terminal of the first transistor is connected to the first terminal of the capacitor module, and the second terminal of the first transistor is connected to the first terminal of the first resistor, which is grounded. The first terminal of the second resistor is connected to the first terminal of the capacitor module, and the second terminal of the second resistor is connected to the first terminal of the third resistor. The control terminal of the first transistor is connected to the junction of the second and third resistors. The first terminal of the second transistor is connected to the second terminal of the third resistor, which is grounded. The control terminal of the second transistor is connected to the output terminal of the RS flip-flop. The set signal terminal is connected to the first terminal of the fourth resistor and the input terminal of the inverter, respectively. The second terminal of the fourth resistor is grounded. The output terminal of the inverter is connected to the first input terminal of the RS flip-flop. The reset signal terminal is connected to the second input terminal of the RS flip-flop, the first terminal of the fifth resistor, the first terminal of the sixth resistor, and the first terminal of the third transistor, respectively. The second terminal of the fifth resistor is used to connect to the power supply. The second terminal of the sixth resistor is grounded. The second terminal of the third transistor is grounded. The control terminal of the third transistor is connected to the anode of the first diode. The cathode of the first diode is connected to the first terminal of the capacitor module.

[0016] In this embodiment, the bleeder circuit is connected to the power supply, so that the function of the bleeder circuit can be controlled when the power system is powered on and before the controller outputs a control signal to the bleeder circuit. Through the action of diodes and transistors, the bleeder circuit stops discharging the capacitor circuit when the voltage of the capacitor circuit drops to a preset voltage value, thus preventing irreversible damage caused by over-discharge of the capacitor circuit.

[0017] In one possible implementation, the second control terminal includes a first sub-control terminal and a second sub-control terminal. The first sub-control terminal is connected to a set signal terminal, and the second sub-control terminal is connected to a reset signal terminal. The controller is configured to output a high-level signal to the set signal terminal via the first sub-control terminal and a high-level signal to the reset signal terminal via the second sub-control terminal, thereby controlling the discharge circuit to discharge the capacitor circuit. Thus, the discharge circuit begins to discharge the capacitor circuit under the control of the controller's output signal.

[0018] In one possible implementation, the controller is further configured to: after the power system is powered on, output a low-level signal to the set signal terminal via the first sub-control terminal, and output a high-level signal to the reset signal terminal via the second sub-control terminal. Thus, the discharge circuit is prevented from discharging the capacitor circuit under the control of the controller's output signal.

[0019] In one possible implementation, the power supply system further includes a second diode, the anode of which is connected to the power output terminal of the voltage converter, and the cathode of which is connected to the capacitor module. Therefore, when the voltage converter is reset and the capacitor module supplies power to the controller, it cannot supply power to the voltage converter in reverse.

[0020] Secondly, embodiments of this application provide a vehicle. The vehicle includes a vehicle controller and a power system as described in the first aspect, with the vehicle controller connected to the power system.

[0021] It should be understood that the technical effects of the second aspect can be referred to the first aspect, and the implementation methods of this application will not be described again here. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application will be described below.

[0023] Figure 1 This is a schematic diagram of the structure of a power supply system disclosed in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a discharge circuit disclosed in an embodiment of this application; Figure 3 This is a schematic diagram of another power supply system disclosed in an embodiment of this application; Figure 4 This is a schematic diagram of a controller monitoring and failure control of a power system according to an embodiment of this application.

[0024] Explanation of reference numerals in the attached figures: 1. Power supply system; 10. Power supply; 20. Voltage converter; 30. Power management circuit; 40. Controller; 50. Capacitor module; 51. Capacitor circuit; 52. Bleeding circuit; 60. Second inverter; 70. Signal conditioning circuit; 80. Signal sampling circuit; 520. RS flip-flop; 521. First inverter; 522. Set signal terminal; 523. Reset signal terminal. Detailed Implementation

[0025] The terms “first,” “second,” etc., are used for descriptive purposes only and have no sequential or technical meaning, nor should they be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0026] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0027] The term "electrical connection" refers to the flow of current or signal from one conductor to another. An electrical connection between A and B means that current or signal can flow from A to B and vice versa. This connection includes direct and indirect electrical connections. A direct electrical connection between A and B means that A and B are physically connected. An indirect electrical connection between A and B means that A and B are connected via C, where C can be at least one wire or device.

[0028] With the rapid development of vehicle electrification, intelligence, and autonomous driving, the number of electrical devices in vehicles is constantly increasing, requiring ever-growing power supplies. Upgrading vehicle low-voltage power supply systems from 12V to 48V or even higher has become an inevitable trend. However, while 12V power supplies have a long history and mature power system and electrical architecture solutions, upgrading to 48V or higher voltages is still in its early stages. Increasing the supply voltage can meet the high-power demands of vehicles, but it also increases safety risks. For example, a power supply voltage failure, resulting in excessive output voltage or current, can cause irreversible damage to the vehicle's load, affecting driving safety.

[0029] Therefore, increasing the voltage of the vehicle's power supply system requires monitoring and status diagnosis of the power supply output and voltage converter output. When the power supply or voltage converter fails, necessary control measures should be taken in a timely manner to reduce safety risks during vehicle operation.

[0030] Therefore, this application provides a power supply system and a vehicle, and the embodiments of this application are described below with reference to the accompanying drawings.

[0031] This application discloses a schematic diagram of a power supply system, such as... Figure 1 As shown. The power system 1 includes a power supply 10, a voltage converter 20, a second diode D2, a power management circuit 30, a controller 40, a second inverter 60, a signal conditioning circuit 70, and a capacitor module 50, wherein the capacitor module 50 includes a capacitor circuit 51 and a discharge circuit 52.

[0032] The output terminal of the power supply 10 is connected to the input terminal of the voltage converter 20. The power output terminal of the voltage converter 20 is connected to the anode of the second diode D2. The cathode of the second diode D2 is connected to the first terminal of the capacitor module 50 and the input terminal of the power management circuit 30. The output terminal of the power management circuit 30 is connected to the power supply terminal of the controller 40. The output terminal of the power supply 10 is connected to the first terminal of the signal conditioning circuit 70. The second terminal of the signal conditioning circuit 70 is electrically connected to the second detection terminal of the controller 40. The first detection terminal of the controller 40 is electrically connected to the signal output terminal of the voltage converter 20. The first control terminal of the controller 40 is electrically connected to the input terminal of the second inverter 60. The output terminal of the second inverter 60 is electrically connected to the reset terminal of the voltage converter 20. The second control terminal of the controller 40 is electrically connected to the second terminal of the capacitor module 50. Specifically, the second control terminal of the controller 40 is connected to the discharge circuit 52.

[0033] The voltage converter 20 in this embodiment is a DC-to-DC converter (DCDC), used to convert the second voltage output by the power supply 10 into a first voltage to supply power to subsequent electrical equipment or loads; in some examples, the second voltage can be 48V and the first voltage can be 12V. That is to say, this embodiment upgrades the traditional 12V low-voltage power supply system to 48V power supply and adds a 48V to 12V voltage converter 20, thereby allowing the use of mature 12V control modules.

[0034] The power management circuit 30 is used to further process the first voltage output by the voltage converter 20 and then supply power to the load; wherein the load includes, but is not limited to, the first voltage output by the voltage converter 20. Figure 1 The controller 40 is shown. In some examples, further processing of the first voltage by the power management circuit 30 may include dynamic voltage regulation, power consumption optimization, and multiple power supply timing control. In some examples, the power management circuit 30 may include one or more low dropout regulators (LDOs) to ensure stable power supply to the load.

[0035] In one possible example, the reset terminal of voltage converter 20 is the enable terminal. Figure 1 When the power supply system 1 is operating normally, the first control terminal of the controller 40 is in a low-level state. After passing through the second inverter 60, it outputs a high-level signal to the enable terminal of the voltage converter 20, thereby enabling the voltage converter 20 to operate normally. After the power supply system 1 is powered on, the capacitor circuit 51 begins to store the electrical energy output by the voltage converter 20 to ensure the stability of the input voltage of the power management circuit 30 when the circuit current fluctuates. Simultaneously, it also meets the power requirements of the controller 40 for monitoring, diagnosing, and controlling the failure of the power supply 10 or the voltage converter 20 in case of a fault. When the power supply system 1 is powered off, the electrical energy stored inside the capacitor circuit 51 will cause the circuit of the power supply system 1 to be in a high-level state. To ensure that the controller 40 starts normally when the power supply system 1 is powered on again, the controller 40 can output a control signal to the discharge circuit 52 through the second control terminal before powering off, thereby discharging the capacitor circuit 51.

[0036] In some embodiments, the voltage converter 20 can monitor its own output voltage and perform internal logic operations. When the internal monitoring detects that the output voltage of the voltage converter 20 is less than the lower limit of a first preset voltage range or greater than the upper limit of the first preset voltage range, a first indication information indicating a fault in the voltage converter 20, after logic operations, is directly transmitted to the first detection terminal of the controller 40 through the signal output terminal. When the internal monitoring detects that the output voltage of the voltage converter 20 is greater than or equal to the lower limit of the first preset voltage range and less than or equal to the upper limit of the first preset voltage range, a second indication information indicating that the voltage converter 20 is in a normal state, after logic operations, is directly transmitted to the first detection terminal of the controller 40 through the signal output terminal.

[0037] In other words, in Figure 1 In the power system 1 shown, the indication information received by the controller 40 is either a first indication information for indicating an abnormal fault in the voltage converter 20, or a second indication information for indicating that the voltage converter 20 is in a normal state.

[0038] The signal conditioning circuit 70 is used to process the collected output voltage of the power supply 10 and transmit it to the second detection terminal of the controller 40. The controller 40 performs logic operations. If the output voltage of the power supply 10 is within the second preset range, it is determined that the power supply 10 is in normal working condition; if the output voltage of the power supply 10 is not within the second preset range, it is determined that the power supply 10 is in fault condition.

[0039] In some implementations, after receiving the second indication information output by the voltage converter 20, the controller 40 determines that the power system 1 is in normal working condition and does not output control signals to the voltage converter 20 and the discharge circuit 52, and the power system 1 operates normally.

[0040] In some implementations, after receiving the first indication information output by the voltage converter 20 and determining that the power supply 10 is in normal working condition, the controller 40 outputs a reset signal to the reset terminal of the voltage converter 20 through the first control terminal and the second inverter 60, thereby controlling the voltage converter 20 to reset.

[0041] Specifically, the enable terminal of the voltage converter 20 operates upon receiving a high-level signal, outputting power. When the controller 40 resets the voltage converter 20, it can first output a high-level signal to the second inverter 60 for a sustained period. This causes the second inverter 60 to continuously output a low-level signal to the enable terminal of the voltage converter 20 for a sustained period, thus stopping the voltage converter 20 from operation for a period. Then, the controller 40 stops the high-level input to the second inverter 60, restoring the low-level output state. The second inverter 60 then outputs a high-level signal to the enable terminal of the voltage converter 20, causing the voltage converter 20 to resume operation and output power. During the reset process of the voltage converter 20, the capacitor module 50 automatically supplies power to the controller 40. The second diode D2 prevents current backflow into the voltage converter 20 when the capacitor module 50 is supplying power, thereby controlling the voltage converter 20. For example, the sustained high-level output of the controller 40 can be 10ms or 20ms.

[0042] In some implementations, after receiving the first indication information output by the voltage converter 20 and determining that the power supply 10 is in a fault state, the controller 40 reports the fault information of the power supply 10 to the vehicle control system. The vehicle control system transmits the fault information to the user interface, controls the power system 1 to enter the shutdown state, and controls the discharge circuit 52 to discharge the capacitor circuit 51.

[0043] Specifically, the controller 40 outputs a high-level signal to the second inverter 60 through the first control terminal, and the second inverter 60 outputs a low-level signal to the enable terminal of the voltage converter 20, causing the voltage converter 20 to enter a low-level state and maintain it, thereby turning off the output of the power supply system 1. The controller 40 outputs a high-level signal to the set signal terminal 522 of the bleeder circuit 52 through the first sub-control terminal of the second control terminal, and outputs a high-level signal to the reset signal terminal 523 of the bleeder circuit 52 through the second sub-control terminal of the second control terminal, controlling the bleeder circuit 52 to discharge the capacitor circuit 51.

[0044] Figure 2A schematic diagram of a discharge circuit 52 is shown, which is used to discharge the capacitor circuit 51 under the control of the controller 40. Figure 2 As shown, the discharge circuit includes a first transistor Q1, a second transistor Q2, a third transistor Q3, an RS flip-flop 520, a first inverter 521, a set signal terminal 522, a reset signal terminal 523, a first diode D1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6. The first transistor Q1 and the third transistor Q3 can be PNP transistors, and the second transistor Q2 can be an NPN transistor.

[0045] The first terminal of the first transistor Q1 is connected to the capacitor circuit 51, and the second terminal of the first transistor Q1 is connected to the first end of the first resistor R1, which is grounded. The first end of the second resistor R2 is connected to the first end of the capacitor circuit 51, and the second end of the second resistor R2 is connected to the first end of the third resistor R3. The control terminal of the first transistor Q1 is connected to the junction of the second resistor R2 and the third resistor R3. The first terminal of the second transistor Q1 is connected to the second end of the third resistor R3, and the second terminal of the second transistor Q2 is grounded. The control terminal of the second transistor Q2 is connected to the output terminal of the RS flip-flop 520. The set signal terminal 522 is connected to the first terminal of the fourth resistor R4 and the input terminal of the first inverter 521, respectively. The second terminal of the fourth resistor R4 is grounded. The output terminal of the first inverter 521 is connected to the first input terminal of the RS flip-flop 520. The reset signal terminal 523 is connected to the second input terminal of the RS flip-flop 520, the first terminal of the fifth resistor R5, the first terminal of the sixth resistor R6, and the first terminal of the third transistor Q3, respectively. The second terminal of the fifth resistor R5 is used to connect to the power supply. The second terminal of the sixth resistor R6 is grounded. The second terminal of the third transistor Q3 is grounded. The control terminal of the third transistor Q3 is connected to the anode of the first diode D1. The cathode of the first diode D1 is connected to the first terminal of the capacitor circuit 51.

[0046] The second control terminal of the controller 40 is connected to the discharge circuit 52. The second control terminal of the controller 40 includes a first sub-control terminal and a second sub-control terminal. Specifically, the first sub-control terminal is connected to the set signal terminal 522, and the second sub-control terminal is connected to the reset signal terminal 523.

[0047] Please continue to refer to Figure 2It should be understood that the discharge circuit 52 may also include other components; for example, the control electrode of the second transistor Q2 is connected to the output of the RS flip-flop 520 through the seventh resistor R7. The seventh resistor R7 can limit the control electrode current of the second transistor Q2, preventing excessive control electrode current from damaging the transistor, and providing a suitable control electrode bias so that the second transistor Q2 operates in a suitable region. For example, the control electrode of the second transistor Q2 can also be grounded through the eighth resistor R8. The eighth resistor R8 can also be called a pull-down resistor, used to prevent the control electrode of the second transistor Q2 from being floating, ensuring that the second transistor Q2 can be effectively grounded even under the influence of external noise, thereby ensuring its reliable cutoff.

[0048] Similarly, other transistors can also have their reliability ensured by using other components. For example, the control electrode of the third transistor Q3 can be connected to the anode of the first diode D1 through the ninth resistor R9. The ninth resistor R9 can limit the control electrode current of the third transistor Q3, preventing excessive control electrode current from damaging the transistor, and providing a suitable control electrode bias so that the third transistor Q3 operates in the appropriate region. For example, the control electrode of the third transistor Q3 can also be connected through the tenth resistor R. 10 Connected to the first terminal of the third transistor Q3, the tenth resistor R 10 It can also be called a pull-up resistor, which is used to prevent the control electrode of the third transistor Q3 from being left floating, and to ensure that the third transistor Q3 can be effectively connected to the high level even when affected by external noise, thereby ensuring the reliability of its cutoff.

[0049] In some examples, the RS flip-flop 520 is an active-low RS flip-flop, and the truth table is as follows:

[0050] Therefore, when the power supply system 1 is working, the operating state of the discharge circuit 52 is as follows: Before the power supply system 1 is powered on: the set signal terminal 522 and the reset signal terminal 523 of the discharge circuit 52 are both in a low-level state. The first input terminal of the RS flip-flop 520 receives the set signal terminal 522 and outputs a high-level signal after passing through the first inverter 521. The second input terminal of the RS flip-flop 520 receives a low-level signal, and the RS flip-flop 520 is in a reset state. That is, the output terminal of the RS flip-flop 520 outputs a low-level signal, and the discharge circuit 52 does not discharge the capacitor circuit 51.

[0051] When power supply system 1 is powered on: capacitor circuit 51 begins charging. At this time, first diode D1 is cut off, and third transistor Q3 is cut off. Controller 40 does not output control signals to discharge circuit 52. The set signal terminal 522 of discharge circuit 52 remains at a low level. The first input terminal of RS flip-flop 520 receives the set signal terminal 522 and outputs a high-level signal after passing through the first inverter 521. Since the second input terminal of RS flip-flop 520 is connected to the first terminal of the fifth resistor and the second terminal of the sixth resistor, when power supply system 1 is powered on, the second input terminal of RS flip-flop 520 receives a high-level signal, and RS flip-flop 520 is in a holding state; that is, the output terminal of RS flip-flop 520 maintains a low-level output signal, and first transistor Q1 and second transistor Q2 are in a cut-off state. Discharge circuit 52 does not discharge capacitor circuit 51.

[0052] When the power supply system 1 is working normally: the stored energy of the capacitor circuit 51 has reached the rated state, the controller 40 outputs a high-level signal to the reset signal terminal 523 and a low-level signal to the set signal terminal 522, the first input terminal and the second input terminal of the RS flip-flop 520 both input high-level signals, the RS flip-flop 520 is in the holding state, the output terminal of the RS flip-flop 520 outputs a low-level signal, the first transistor Q1 and the second transistor Q2 are in the cut-off state, and the discharge circuit 52 does not discharge the capacitor circuit 51.

[0053] When power supply system 1 is powered off: Due to the voltage of capacitor circuit 51, the first diode D1 is still in the off state, and the third transistor Q3 is also in the off state. Controller 40 outputs high-level signals to both the set signal terminal 522 and the reset signal terminal 523 of discharge circuit 52. The first input terminal of RS flip-flop 520 receives the low-level signal output by the set signal terminal 522 after passing through the first inverter 521. The second input terminal of RS flip-flop 520 receives the high-level signal, and RS flip-flop 520 enters the set state. The output terminal of RS flip-flop 520 outputs a high-level signal, the second transistor Q2 is turned on, and then the first transistor Q1 is also turned on. Discharge circuit 52 begins to discharge capacitor circuit 51.

[0054] When the controller 40 is powered off: Due to the voltage of the capacitor circuit 51, the first diode D1 remains in the off state, and the third transistor Q3 is also in the off state. The controller 40 does not output a control signal to the discharge circuit 52. Under the action of the fourth resistor R4, the set signal terminal 522 inputs a low-level signal to the input terminal of the first inverter 521. The output terminal of the first inverter 521 outputs a high-level signal to the first input terminal of the RS flip-flop 520. The reset signal terminal 523 remains in the high-level state and inputs a high-level signal to the second input terminal of the RS flip-flop 520. The RS flip-flop 520 is in the hold state, and the output terminal of the RS flip-flop 520 outputs a high-level signal. The second transistor Q2 is turned on, and then the first transistor Q1 is also turned on. The discharge circuit 52 continues to discharge the capacitor circuit 51.

[0055] When power supply system 1 is powered off: When capacitor circuit 51 discharges to a predetermined voltage, first diode D1 conducts, thereby turning on third transistor Q3. A low-level signal is input to the second input terminal of RS flip-flop 520. Under the action of fourth resistor R4, set signal terminal 522 inputs a low-level signal to the input terminal of first inverter 521. The output terminal of first inverter 521 outputs a high-level signal to the first input terminal of RS flip-flop 520, causing RS flip-flop 520 to enter a reset state. The output terminal of RS flip-flop 520 outputs a low-level signal, second transistor Q2 is turned off, thereby turning off first transistor Q1. Discharge circuit 52 stops discharging capacitor circuit 51. For example, when the voltage of capacitor circuit 51 reaches 2V, first diode D1 can conduct.

[0056] This application also discloses a schematic diagram of another power supply system, such as... Figure 3 As shown. The power system 1 includes a power supply 10, a voltage converter 20, a signal sampling circuit 80, a second diode D2, a power management circuit 30, a controller 40, a second inverter 60, a signal conditioning circuit 70, and a capacitor module 50, wherein the capacitor module 50 includes a capacitor circuit 51 and a discharge circuit 52.

[0057] The output terminal of the power supply 10 is connected to the input terminal of the voltage converter 20. The power output terminal of the voltage converter 20 is connected to the anode of the second diode D2 and the first terminal of the signal sampling circuit 80. The cathode of the second diode D2 is connected to the first terminal of the capacitor module 50 and the input terminal of the power management circuit 30. The output terminal of the power management circuit 30 is connected to the power supply terminal of the controller 40. The output terminal of the power supply 10 is connected to the first terminal of the signal conditioning circuit 70. The second terminal of the signal conditioning circuit 70 is electrically connected to the second detection terminal of the controller 40. The third detection terminal of the controller 40 is electrically connected to the output terminal of the signal sampling circuit 80. The first control terminal of the controller 40 is electrically connected to the input terminal of the second inverter 60. The output terminal of the second inverter 60 is electrically connected to the reset terminal of the voltage converter 20. The second control terminal of the controller 40 is electrically connected to the second terminal of the capacitor module 50. Specifically, the second control terminal of the controller 40 is connected to the discharge circuit 52.

[0058] and Figure 1 Unlike the power supply system 1 shown, in such a way... Figure 3 In the power supply system 1 shown, the voltage converter 20 does not have the function of monitoring its own output voltage and performing internal logic operations.

[0059] In one possible example, the signal sampling circuit 80 processes the acquired output voltage of the voltage converter 20 and transmits it to the third detection terminal of the controller 40. The controller 40 performs logical operations on the received output voltage. If the output voltage of the voltage converter 20 is less than the lower limit of the first preset voltage range or greater than the upper limit of the first preset voltage range, the voltage converter 20 is determined to be in a fault state; if the output voltage of the voltage converter 20 is greater than or equal to the lower limit of the first preset voltage range and less than or equal to the upper limit of the first preset voltage range, the voltage converter 20 is determined to be in a normal operating state.

[0060] In one possible example, after the controller 40 determines that the voltage converter 20 is in a fault state and the power supply 10 is in a normal working state, it outputs a reset signal to the reset terminal of the voltage converter 20 through the first control terminal and the second inverter 60 to control the voltage converter 20 to reset.

[0061] In one possible example, after the controller 40 determines that the voltage converter 20 is in a fault state and the power supply 10 is in a fault state, it reports the fault information of the power supply 10 to the vehicle control system. The vehicle control system transmits the fault information to the user interface, controls the power system 1 to enter the shutdown state, and controls the discharge circuit 52 to discharge the capacitor circuit 51.

[0062] In one possible example, if the controller 40 determines that the voltage converter 20 is in normal working condition, then the power supply system 1 is in normal working condition, and no control signal is output to the voltage converter 20 and the discharge circuit 52, and the power supply system 1 operates normally.

[0063] This application discloses a flowchart illustrating a controller's monitoring and failure control of a power system, as shown in the following embodiments. Figure 4 As shown. This process includes S110-S130, as follows: S110, monitors the status signal of the voltage converter.

[0064] Specifically, after the power supply system 1 is powered on, the controller 40 monitors the status signal output by the voltage converter 20. If the controller 40 receives a high-level status signal from the voltage converter 20, the controller 40 determines that the voltage converter 20 is in normal working condition, and thus determines that the power supply system 1 is normal. If the controller 40 receives a low-level status signal from the voltage converter 20, it executes steps S120 and / or S130.

[0065] Specifically, when the output voltage of voltage converter 20 is within 93%-107% of 12V, that is, within the voltage range of 11.16V-12.84V, the status signal output by voltage converter 20 to controller 40 is a high-level normal operation signal; when the output voltage of voltage converter 20 is not within the voltage range of 11.16V-12.84V, the status signal output by voltage converter 20 to controller 40 is a low-level fault signal.

[0066] S120, monitor the voltage of the power supply.

[0067] When the controller 40 receives a low-level fault signal from the voltage converter 20, it checks the voltage of the power supply 10 input to the signal conditioning circuit 70. If the controller 40 determines that the voltage of the power supply 10 is not within the second preset voltage range, it determines that the power supply 10 is in a fault state. The controller 40 outputs a fault signal for the power supply 10 and uploads it to the vehicle controller 40. The vehicle controller 40 outputs fault information to the user, and simultaneously controls the power system 1 to power down, putting the vehicle into a safe mode. If the controller 40 determines that the voltage of the power supply 10 is within the second preset voltage output range, it determines that the power supply 10 is in normal working condition and executes step S130. For example, the power supply 10 can be a 48V power supply. If the controller 40 determines that the output voltage of the 48V power supply is between 36V and 52V, it can determine that the 48V power supply is working normally.

[0068] S130, Reset Voltage Converter.

[0069] Specifically, when the controller 40 receives a low-level status signal from the voltage converter 20 and determines that the power supply 10 is in normal working condition, the controller 40 outputs a reset signal to the voltage converter 20 and determines whether the reset count is greater than or equal to a preset reset count threshold. The initial reset count of the controller 40 is 0. If the reset count is less than the preset reset count threshold, the reset count is incremented by 1, and the voltage converter 20 is reset, repeating steps S110-S130. If the reset count is greater than or equal to the preset reset count threshold, the controller 40 uploads a fault signal from the voltage converter 20 to the vehicle control system. The vehicle controller 40 outputs fault information to the user, and simultaneously, the controller 40 controls the power supply system 1 to power down, controlling the vehicle to enter a safe mode. For example, the preset reset count threshold can be 3 times.

[0070] Specifically, controlling the vehicle to enter safe mode means that if the controller 40 determines that the power supply 10 is faulty, it shuts down the power system 1. At the same time, to ensure the normal operation of the vehicle, the vehicle's redundant power supply provides power to the vehicle system. For example, the braking system, steering system, and other load systems can be powered by the dual power supply system 1.

[0071] This application provides a vehicle. The vehicle includes a vehicle controller 40 and the aforementioned power system 1. The vehicle controller 40 is connected to and communicates with the controller 40 in the power system 1. Specifically, when the power supply 10 or voltage converter in the power system 1 fails, the controller 40 uploads information about the power supply 10 or voltage converter 20 failure to the vehicle controller 40. After receiving the fault information, the vehicle controller 40 uploads the power supply 10 or voltage converter 20 failure information to the user interface. For example, the fault information may be the text message "Power supply failure, please go to the nearest repair shop for repair" or "Voltage converter failure, please go to the nearest repair shop for repair."

[0072] The vehicle can be, but is not limited to, a pure electric vehicle (PEV / BEV), a hybrid electric vehicle (HEV), a range-extended electric vehicle (REEV), a plug-in hybrid electric vehicle (PHEV), or a new energy vehicle (NEV).

[0073] It should be understood that the application of this application is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims. Those skilled in the art can understand that implementing all or part of the above embodiments and making equivalent changes according to the claims of this application still fall within the scope of this application.

Claims

1. A power supply system, characterized in that, The power system (1) includes a voltage converter (20), a capacitor module (50), and a controller (40); wherein, The input terminal of the voltage converter (20) is used to connect to the power supply (10), and the power output terminal of the voltage converter (20) is connected to the first terminal of the capacitor module (50) and the power supply terminal of the controller (40), respectively. The controller (40) is configured to: Obtain indication information of the voltage converter (20), the indication information being related to the first voltage output by the power output terminal of the voltage converter (20); Obtain the second voltage input to the input terminal of the voltage converter (20); The voltage converter (20) is reset according to the indicated information and the second voltage control.

2. The power supply system according to claim 1, characterized in that, The controller (40) includes a first detection terminal, a second detection terminal and a first control terminal, and the voltage converter (20) includes a signal output terminal and a reset terminal; The first detection terminal of the controller (40) is connected to the signal output terminal of the voltage converter (20), and the second detection terminal of the controller (40) is connected to the input terminal of the voltage converter (20). The first control terminal of the controller (40) is connected to the reset terminal of the voltage converter (20), and the controller (40) is configured to: Receive the first indication information output by the signal output terminal of the voltage converter (20), the first indication information is used to indicate that the first voltage is less than the lower limit of the first preset voltage range or greater than the upper limit of the first preset voltage range; In response to the first indication information, determine the relationship between the second voltage and the second preset voltage range; In response to the second voltage being within the second preset voltage range, a reset signal is output to the voltage converter (20) through the first control terminal, and the reset signal is used to control the voltage converter (20) to reset.

3. The power supply system according to claim 1, characterized in that, The controller (40) includes a second detection terminal, a third detection terminal and a first control terminal, and the voltage converter (20) includes a reset terminal; The third detection terminal of the controller (40) is connected to the power output terminal of the voltage converter (20), and the second detection terminal of the controller (40) is connected to the input terminal of the voltage converter (20). The first control terminal of the controller (40) is connected to the reset terminal of the voltage converter (20), and the controller (40) is configured to: Obtain indication information from the voltage converter (20), the indication information being used to indicate the value of the first voltage; In response to the indication information indicating that the value of the first voltage is less than the lower limit of the first preset voltage range or greater than the upper limit of the first preset voltage range, the relationship between the second voltage and the second preset voltage range is determined. In response to the second voltage being within the second preset voltage range, a reset signal is output to the voltage converter (20) through the first control terminal, and the reset signal is used to control the voltage converter (20) to reset.

4. The power supply system according to claim 2 or 3, characterized in that, The controller (40) further includes a second control terminal, which is connected to a second terminal of the capacitor module (50), and the controller (40) is further configured to: In response to the second voltage not being within the second preset voltage range, the voltage converter (20) is controlled to stop working via the first control terminal, and the capacitor module (50) is controlled to discharge via the second control terminal.

5. The power supply system according to any one of claims 1 to 3, characterized in that, The controller (40) is also configured to: If the number of output resets is greater than or equal to the preset reset number threshold, the voltage converter (20) is controlled to stop working, and the capacitor module (50) is controlled to discharge.

6. The power supply system according to claim 4, characterized in that, The controller (40) is also configured to: In response to the power supply system (1) being powered off, the capacitor module (50) is controlled to discharge.

7. The power supply system according to claim 6, characterized in that, The capacitor module (50) includes a capacitor circuit (51) and a discharge circuit (52), the discharge circuit (52) being connected to the capacitor circuit (51), and the discharge circuit (52) being configured as follows: In response to the control signal issued by the controller (40), the capacitor circuit (51) is discharged; In response to the voltage signal of the capacitor circuit (51) being less than a preset voltage value, the discharge of the capacitor circuit (51) is stopped.

8. The power supply system according to claim 7, characterized in that, The discharge circuit (52) includes a first transistor, a second transistor, a third transistor, an RS flip-flop (520), a first inverter (521), a set signal terminal (522), a reset signal terminal (523), a first diode, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor; The first terminal of the first transistor is connected to the first terminal of the capacitor module (50), the second terminal of the first transistor is connected to the first terminal of the first resistor, and the second terminal of the first resistor is grounded; The first end of the second resistor is connected to the first end of the capacitor module (50), the second end of the second resistor is connected to the first end of the third resistor, the control electrode of the first transistor is connected to the connection point of the second resistor and the third resistor, the first electrode of the second transistor is connected to the second end of the third resistor, the second electrode of the second transistor is grounded, and the control electrode of the second transistor is connected to the output terminal of the RS flip-flop (520). The set signal terminal (522) is connected to the first terminal of the fourth resistor and the input terminal of the inverter, respectively. The second terminal of the fourth resistor is grounded, and the output terminal of the inverter is connected to the first input terminal of the RS flip-flop (520). The reset signal terminal (523) is connected to the second input terminal of the RS flip-flop (520), the first terminal of the fifth resistor, the first terminal of the sixth resistor, and the first terminal of the third transistor. The second terminal of the fifth resistor is used to connect to the power supply (10), the second terminal of the sixth resistor is grounded, and the second terminal of the third transistor is grounded. The control electrode of the third transistor is connected to the anode of the first diode, and the cathode of the first diode is connected to the first end of the capacitor module (50).

9. The power supply system according to claim 8, characterized in that, The second control terminal includes a first sub-control terminal and a second sub-control terminal. The first sub-control terminal is connected to the set signal terminal (522), and the second sub-control terminal is connected to the reset signal terminal (523). The controller (40) is configured as follows: The first sub-control terminal outputs a high-level signal to the set signal terminal (522), and the second sub-control terminal outputs a high-level signal to the reset signal terminal (523), thereby controlling the discharge circuit (52) to discharge the capacitor circuit (51).

10. The power supply system according to claim 9, characterized in that, The controller (40) is also configured to: After the power supply system (1) is powered on, a low-level signal is output to the set signal terminal (522) through the first sub-control terminal, and a high-level signal is output to the reset signal terminal (523) through the second sub-control terminal.

11. The power supply system according to claim 1, characterized in that, The power supply system (1) also includes a second diode, the anode of which is connected to the power output terminal of the voltage converter (20), and the cathode of which is connected to the capacitor module (50).

12. A vehicle, characterized in that, It includes a vehicle controller and a power system (1) as described in any one of claims 1 to 11, wherein the vehicle controller is connected to the power system (1).

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