Vehicle redundant power supply circuit and method

Abstract

The invention relates to the technical field of vehicle power supply control, and discloses a vehicle redundant power supply circuit and method, and the vehicle redundant power supply circuit comprises a power conversion circuit and a rectification filter circuit. The power conversion circuit is electrically connected with the power battery, the power conversion circuit is electrically connected with the rectification filter circuit, and the rectification filter circuit is electrically connected with a vehicle weak current component; the power conversion circuit is used for receiving a first output electric signal of the power battery and carrying out inversion and voltage reduction on the first output electric signal to obtain an alternating current electric signal; the rectifying and filtering circuit is used for rectifying and filtering the alternating-current electric signal to obtain a second output electric signal matched with the voltage of the vehicle weak-current component and transmitting the second output electric signal to the vehicle weak-current component, and the vehicle weak-current component at least comprises one of a battery management system and a vehicle sensor. The reliability of normal use of the vehicle weak current component is improved, and the risk of power shortage of the power battery is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle power supply control, and in particular to a vehicle redundant power supply circuit and method. Background Art

[0002] Electric vehicles or hybrid vehicles often have two batteries, one is a low-voltage lead-acid battery and the other is a high-voltage power battery. The lead-acid battery is connected to the battery management system and vehicle sensors and other vehicle weak-current components. The battery management system is mainly used to monitor the power battery information on the vehicle to ensure that the on-board power battery works more safely and reliably. In addition to the on-board high-voltage components, other weak-current vehicle components require lead-acid batteries to power, such as the vehicle's ignition, door switches, window switches and other weak-current functions, so that lead-acid batteries are used to power the above functions. The power battery is mainly used for the energy consumption of high-current functions such as vehicle driving. There are some problems with the current power supply scheme. On the one hand, lead-acid batteries are often installed in the front compartment of the vehicle. If the vehicle collides, the power supply harness of the lead-acid battery may be disconnected, causing the on-board units responsible for the battery management system to lose power and fail to work. On the other hand, various sensors often continue to monitor when the car is turned off and parked. These sensors also need to be powered by lead-acid batteries. Long-term use of lead-acid batteries will cause the lead-acid batteries to run out of power, and the vehicle cannot start after the lead-acid batteries run out of power. In other aspects, there are often no charging piles in the parking state. In order to charge the lead-acid battery, the current common practice is that the vehicle controller periodically wakes up the battery management system to close the relay in the power battery and start the DC voltage conversion module that charges the lead-acid battery, so that the power battery's electrical energy is converted into voltage through the DC voltage conversion module and then the lead-acid battery is charged. However, waking up the battery management system and the DC voltage conversion module in the parking state will cause the power battery to consume too much power, resulting in the problem of undervoltage and power loss of the power battery. Summary of the invention

[0003] In view of this, the present invention provides a vehicle redundant power supply circuit and method to solve the problem of vehicle failure to start and power battery depletion caused by failure of the vehicle lead-acid battery.

[0004] In the first aspect, the present invention provides a vehicle redundant power supply circuit, which includes: a power conversion circuit and a rectifier and filter circuit; the power conversion circuit is electrically connected to a power battery, the power conversion circuit is electrically connected to the rectifier and filter circuit, and the rectifier and filter circuit is electrically connected to a vehicle weak-current component; the power conversion circuit is used to receive a first output electrical signal from the power battery, and to invert and step down the first output electrical signal to obtain an AC signal; the rectifier and filter circuit is used to rectify and filter the AC signal to obtain a second output electrical signal that is voltage-adapted to the vehicle weak-current component, and transmit the second output electrical signal to the vehicle weak-current component, and the vehicle weak-current component includes at least one of a battery management system and a vehicle sensor.

[0005] In the second aspect, the present invention provides a vehicle redundant power supply method, which is applied to a vehicle redundant power supply circuit, and the method includes: receiving a first output electrical signal of a power battery through a power conversion circuit; inverting and stepping down the first output electrical signal through the power conversion circuit to obtain an AC signal; rectifying and filtering the AC signal through a rectifier and filter circuit to obtain a second output electrical signal that is adapted to the voltage of the vehicle's weak-current components; and transmitting the second output electrical signal to the vehicle's weak-current components.

[0006] The technical solution provided by the present invention has the following advantages:

[0007] The present invention adds a redundant power supply circuit to the vehicle, which mainly realizes the function of an isolated DC / DC converter from high voltage to low voltage through a power conversion circuit, thereby converting the high-voltage power battery electric energy into low-voltage electric energy suitable for the weak-current components of the vehicle, and powering the battery management system and vehicle sensors. Since the power battery and the lead-acid battery are installed in different positions, the power battery is usually installed on the chassis or the rear of the car. Even if the lead-acid battery line is disconnected due to a vehicle collision, the power battery can be used to power the door switch and the vehicle starting components of the vehicle, thereby avoiding the problem that the windows and doors cannot be opened and the vehicle cannot be started. On the other hand, when the vehicle is in a parking state with the engine turned off, the weak-current components of the vehicle can be directly powered by the power battery based on the redundant power supply circuit of the vehicle, avoiding the step of repeatedly charging the lead-acid battery with the power battery, reducing the number of wake-up times of the battery management system in the parking state, and thus reducing the risk of power battery power shortage. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0009] Figure 1 is a structural schematic diagram of a vehicle redundant power supply circuit according to an embodiment of the present invention;

[0010] Figure 2 is another structural schematic diagram of a redundant power supply circuit for a vehicle according to an embodiment of the present invention;

[0011] Figure 3 is a flow chart of a vehicle redundant power supply method according to an embodiment of the present invention;

[0012] Figure 4 is another flow chart of a vehicle redundant power supply method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0014] According to an embodiment of the present invention, a redundant power supply circuit for a vehicle is provided. Figure 1 As shown, the vehicle redundant power supply circuit at least includes a power conversion circuit and a rectifier and filter circuit; the power conversion circuit is electrically connected to the power battery, the power conversion circuit is electrically connected to the rectifier and filter circuit, and the rectifier and filter circuit is electrically connected to the vehicle's weak-current components; the power conversion circuit is used to receive a first output electrical signal from the power battery, and invert and step down the first output electrical signal to obtain an AC signal; the rectifier and filter circuit is used to rectify and filter the AC signal to obtain a second output electrical signal that is voltage-adapted to the vehicle's weak-current components, and transmit the second output electrical signal to the vehicle's weak-current components, and the vehicle's weak-current components include at least one of a battery management system and a vehicle sensor.

[0015] Specifically, the present invention adds a vehicle redundant power supply circuit to the vehicle, which mainly realizes the function of an isolated DC / DC converter from high voltage to low voltage through a power conversion circuit, thereby converting high-voltage power battery energy into low-voltage energy that is suitable for the vehicle's weak current components, and powering the battery management system and vehicle sensors.

[0016] Among them, the power conversion circuit includes multiple switching tubes and a switching transformer. The first output electrical signal output by the power battery is high-voltage direct current. The first output electrical signal is cut into high-frequency alternating current through the periodic conduction and shutdown of the switching tube in the power conversion circuit. The high-frequency alternating current is transmitted to the primary coil of the switching transformer, and the changing magnetic flux is generated by the switching transformer to induce voltage on the secondary coil of the switching transformer to achieve the purpose of voltage reduction. The output voltage is an AC signal with reduced voltage, which is compatible with the vehicle's weak-current components. However, the vehicle's weak-current components need to use direct current. After that, the AC signal is filtered and rectified by a rectifier and filter circuit to obtain a second output electrical signal in a low-voltage DC form that is compatible with the vehicle's weak-current components.

[0017] Since the power battery and the lead-acid battery are installed in different locations, the power battery is usually installed on the chassis or tail of the car. Even if the lead-acid battery line is disconnected due to a vehicle collision, the power battery can be used to power the vehicle's door switches and vehicle starting components, avoiding the problem of windows and doors not being able to open and the vehicle not being able to start. On the other hand, when the vehicle is turned off and parked, the power battery can be used to directly power the vehicle's weak-current components based on the vehicle's redundant power supply circuit, avoiding the step of repeatedly charging the lead-acid battery with the power battery, reducing the number of wake-up times of the battery management system in the parking state, and thus reducing the risk of power battery power failure.

[0018] In some optional embodiments, Figure 2 As shown, the vehicle redundant power supply circuit provided by the present invention further includes: a high-voltage to low-voltage non-isolated power supply and a power conversion control chip;

[0019] The high-voltage-to-low-voltage non-isolated power supply is electrically connected to the power battery and the power conversion control chip respectively. The high-voltage-to-low-voltage non-isolated power supply is used to reduce the voltage of the first output electrical signal to obtain a third output electrical signal. The third output electrical signal is used to power the power conversion control chip.

[0020] The power conversion circuit is also electrically connected to a power conversion control chip, which is used to control the transformation ratio of the power conversion circuit through a pulse signal. The power conversion circuit is used to convert the first output electrical signal into an AC electrical signal according to the transformation ratio.

[0021] Specifically, a high-voltage to low-voltage non-isolated power supply refers to a non-isolated DC / DC module, where non-isolation means that the power module and the power battery share a common ground, so that the power of the power battery can be used to power other chip components in the vehicle's redundant power supply circuit. Among them, the power conversion control chip can output a PWM pulse signal, thereby adjusting the switching tube frequency or duty cycle (determined by the chip characteristics) in the power conversion circuit, thereby adjusting the power conversion circuit output, achieving the purpose of changing the transformation ratio, and then achieving the effect of adjusting the output current and output current.

[0022] The high-voltage to low-voltage non-isolated power supply converts the first output electrical signal into a third output electrical signal that the voltage and power conversion control chip can adapt to, and supplies power to the power conversion control chip.

[0023] Through the technical solution provided by the embodiment of the present invention, a power conversion control chip for controlling the regulation effect of the power conversion circuit is added to the vehicle redundant power supply circuit, and it is powered by a high-voltage to low-voltage non-isolated power supply to enable the power conversion control chip to work normally. As a result, when the vehicle redundant power supply circuit encounters problems such as excessive current, the voltage conversion size of the power conversion circuit can be adjusted according to some user demand signals, thereby further improving the working stability of the vehicle redundant power supply circuit.

[0024] In some optional embodiments, Figure 2 As shown, the vehicle redundant power supply circuit also includes an overvoltage and undervoltage protection circuit, an electromagnetic filtering circuit and a fuse; the overvoltage and undervoltage protection circuit is electrically connected between the high-voltage to low-voltage non-isolated power supply and the power battery, and the overvoltage and undervoltage protection circuit is communicatively connected to the power conversion control chip; the electromagnetic filtering circuit and the fuse are electrically connected in series between the power conversion circuit and the power battery; the overvoltage and undervoltage protection circuit is used to detect overvoltage or undervoltage of the power battery, and is used to cut off the connection with the high-voltage to low-voltage non-isolated power supply when overvoltage or undervoltage is detected, so that the power conversion control chip stops working; the fuse is used to blow when an overcurrent occurs in the first output electrical signal; the electromagnetic filtering circuit is used to perform electromagnetic filtering on the first output electrical signal.

[0025] Specifically, the embodiment of the present invention utilizes the melting characteristics of the fuse to provide protection for the circuit. When a short-circuit current that cannot be adjusted or disconnected occurs in the redundant power supply circuit of the vehicle, the fuse blows to avoid damage to chip components in the circuit.

[0026] In addition, the electromagnetic filter circuit is connected after the power battery output and before the power conversion circuit. The electromagnetic filter circuit is a filter circuit composed of capacitors, inductors and resistors. Its implementation principle is the existing technology and will not be described in detail in the present invention. Thus, the electromagnetic filter circuit performs electromagnetic filtering on the first output electrical signal output by the power battery, suppresses the electromagnetic interference problem caused by the vehicle redundant power supply circuit, and improves the reliability of the electrical signal.

[0027] In addition, the overvoltage and undervoltage protection circuit provided by the present invention can also judge whether the power battery has overvoltage or undervoltage according to the size of the first output electrical signal of the power battery. Once overvoltage or undervoltage occurs, the connection with the high-voltage to low-voltage non-isolated power supply is cut off to stop the power conversion control chip from working. The power conversion control chip is turned off to prevent the damage of the subsequent circuit after the overvoltage occurs, and the undervoltage occurs to continuously consume the power of the battery pack and cause the battery pack to have undervoltage. The overvoltage and undervoltage protection circuit is often implemented based on a circuit composed of a voltage detection element and a comparator. The internal circuit composition and principle of the overvoltage and undervoltage protection circuit are prior art, and the present invention will not repeat them.

[0028] In some optional embodiments, Figure 2 As shown, the vehicle redundant power supply circuit provided by the present invention also includes: a digital isolation transmission module, a latch circuit and a photoelectric coupler; the digital isolation transmission module is communicatively connected to the overvoltage and undervoltage protection circuit, the digital isolation transmission module is electrically connected to the high-voltage to low-voltage non-isolated power supply, the digital isolation transmission module is also communicatively connected to the battery management system, the latch circuit is communicatively connected to the battery management system, the latch circuit is communicatively connected to the photoelectric coupler, and the photoelectric coupler is communicatively connected to the overvoltage and undervoltage protection circuit; the high-voltage to low-voltage non-isolated power supply is also used to output a third output electrical signal to the digital isolation transmission module to power the digital isolation transmission module; the overvoltage and undervoltage protection circuit is used to output an overvoltage and undervoltage signal to the digital isolation transmission module when an overvoltage or undervoltage phenomenon is detected, and the digital isolation transmission module is used to transmit the overvoltage and undervoltage signal to the battery management system; the battery management system is used to output a shutdown signal in response to the overvoltage and undervoltage signal, and the shutdown signal passes through the latch circuit and the photoelectric coupler to reach the overvoltage and undervoltage protection circuit; the overvoltage and undervoltage protection circuit is also used to shut down the power conversion control chip in response to the shutdown signal.

[0029] Specifically, although the overvoltage and undervoltage protection circuit can shut itself down at the hardware level when it detects overvoltage and undervoltage, thereby protecting the circuit, this circuit structure does not have the ability to actively shut down the overvoltage and undervoltage protection circuit at the software level according to user needs. In order to further improve the controllability of the vehicle redundant power supply circuit, the embodiment of the present invention forwards the overvoltage and undervoltage signals output by the overvoltage and undervoltage protection circuit to the battery management system through a digital isolation transmission module. Because the battery management system is weak current and the vehicle redundant power supply circuit is strong current, the two do not share a common ground, so the high-voltage signal cannot be directly sent to the low-voltage circuit module, so that capacitive isolation or magnetic isolation is performed through the digital isolation transmission module, and a signal interface is provided to the outside to convert the high-voltage overvoltage and undervoltage signals into low-voltage overvoltage and undervoltage signals, and then send them to the battery management system.

[0030] The battery management system has programming capabilities and can respond to overvoltage and undervoltage signals through predefined circuit protection strategies or user instructions, and generate a corresponding shutdown signal. After that, the shutdown signal is sent, and the shutdown signal reaches the overvoltage and undervoltage protection circuit through the latch circuit and the photocoupler, achieving the effect of actively controlling the disconnection of the overvoltage and undervoltage protection circuit, thereby actively shutting off the connection between the overvoltage and undervoltage protection circuit and the high-voltage to low-voltage non-isolated power supply, so that the power conversion control chip stops working, achieving the purpose of actively protecting the circuit.

[0031] The latch circuit and the photocoupler are used to transmit the shutdown signal. The latch circuit ensures that the shutdown signal output by the battery management system is still valid when the battery management system enters the dormant state. In addition, because the shutdown signal output is sent from the battery management system and does not share the same ground with the vehicle redundant power supply circuit, the signal needs to be isolated and transmitted. The purpose of signal isolation transmission can also be achieved through the photocoupler. Through isolation, the front-stage circuit can be protected from the influence of the back-stage circuit.

[0032] In some optional embodiments, Figure 2 As shown, the vehicle redundant power supply circuit provided by the present invention also includes: an input current detection module, a temperature detection module, an output current monitoring and measuring circuit, an output voltage monitoring and measuring circuit, a voltage and current feedback circuit and a linear photoelectric coupler.

[0033] Among them, the input current detection module and the temperature detection module are both electrically connected to the high-voltage to low-voltage non-isolated power supply, the input current detection module and the temperature detection module are also communicatively connected to the digital isolation transmission module, the output current monitoring and measurement circuit and the output voltage monitoring and measurement circuit are both electrically connected to the rectifier and filter circuit, the output current monitoring and measurement circuit and the output voltage monitoring and measurement circuit are also electrically connected to the voltage and current feedback circuit, the voltage and current feedback circuit is communicatively connected to the linear optocoupler, the linear optocoupler is communicatively connected to the power conversion control chip, and the battery management system is also communicatively connected to the output current monitoring and measurement circuit.

[0034] Specifically, the input current detection module and the temperature detection module are both used to receive the third output electrical signal output by the high-voltage to low-voltage non-isolated power supply. On the one hand, the third output electrical signal can power the input current detection module and the temperature detection module. On the other hand, the input current detection module is used to perform overcurrent detection of the input current according to the third output electrical signal, and the temperature detection module is used to perform overtemperature detection of the input current according to the third output electrical signal. Among them, the input current detection module can be a chip integrated with a current detection element, so as to alarm the third output electrical signal that exceeds the current threshold and output a corresponding overcurrent signal. Similarly, the temperature detection module can be a chip integrated with a temperature detection element, so as to detect the circuit temperature through the third output electrical signal, and alarm when the temperature threshold is exceeded, and output a corresponding overtemperature signal.

[0035] Among them, the overcurrent signal output by the input current detection module and the overtemperature signal output by the temperature detection module are sent to the digital isolation transmission module, and the overcurrent signal and the overtemperature signal are forwarded to the battery management system through the capacitive isolation or magnetic isolation processing of the digital isolation transmission module. The purpose and effect of isolating and transmitting signals by the digital isolation transmission module can be found in the description of the aforementioned embodiment, which will not be repeated here.

[0036] The purpose of the embodiment of the present invention is to timely reduce the input current of the vehicle redundant power supply circuit when an overcurrent or overtemperature phenomenon is detected in the input current of the vehicle redundant power supply circuit, and to timely cut off the connection between the vehicle redundant power supply circuit and the power when problems occur repeatedly, thereby producing a circuit protection effect.

[0037] Based on the above purpose, the battery management system provided by the present invention can predefine the circuit protection strategy, generate the current threshold adjustment signal by responding to the received overcurrent signal or overtemperature signal, and send the current threshold adjustment signal to the output current monitoring and measuring circuit. At this time, the output current monitoring and measuring circuit only plays the role of forwarding the signal, and the output current monitoring and measuring circuit forwards the current threshold adjustment signal to the voltage and current feedback circuit. The current threshold adjustment signal indicates the adjustment requirement for the input current when the overcurrent phenomenon occurs, so as to adjust the input current to a reasonable range. The voltage and current feedback circuit is an integrated circuit module, which is used to generate a corresponding power adjustment signal according to the requirement expressed by the current threshold adjustment signal, and feed back the power adjustment signal to the power conversion control chip through a linear optocoupler. The power conversion control chip responds to the power adjustment signal and can output different pulse signals to the power conversion circuit to adjust the voltage conversion ratio of the power conversion circuit. After adjustment, the output current of the power conversion circuit can be reduced, and the output power is correspondingly reduced. After the output power is reduced, the input power of the redundant power supply will also be reduced, and the input current will also decrease under certain conditions of the input voltage.

[0038] In addition, in the implementation of the present invention, if the battery management system repeatedly receives an overcurrent signal or an overtemperature signal, when the preset number of times is exceeded, it indicates that the aforementioned adjustment step has not produced the corresponding current reduction effect. At this time, the battery management system will generate a shutdown signal of the aforementioned embodiment, and send a shutdown signal to the overvoltage and undervoltage protection circuit, directly shut down the relay in the overvoltage and undervoltage protection circuit, stop the vehicle's redundant power supply circuit from continuing to work, and ensure the safety and reliability of the circuit.

[0039] In the embodiment of the present invention, considering that the output and input of the vehicle redundant power supply circuit do not share a common ground, isolated signal transmission is also required. Because accurate changes in the output voltage and output current are also required to correctly express the current threshold requirements, rather than a simple switching signal, the linear optocoupler used in this embodiment can further ensure the accuracy of the transmitted signal.

[0040] In addition, in an embodiment of the present invention, the output current monitoring and measuring circuit is also used to detect whether the second output electrical signal output by the rectifier and filter circuit has an output current overcurrent phenomenon, and also generates a current threshold adjustment signal when the output current overcurrent phenomenon is detected. Similarly, the output voltage monitoring and measuring circuit is used to detect whether the second output electrical signal output by the rectifier and filter circuit has an output voltage overvoltage phenomenon, and generates a voltage threshold adjustment signal when the output voltage overvoltage phenomenon is detected. The output voltage monitoring and measuring circuit is also used to send the voltage threshold adjustment signal to the voltage and current feedback circuit. In an embodiment of the present invention, the specific structures of the output current monitoring and measuring circuit and the output voltage monitoring and measuring circuit can be implemented by a chip made of an integrated circuit. The specific implementation method can refer to the prior art, and the embodiment of the present invention will not be repeated.

[0041] In some optional embodiments, Figure 2 As shown, the battery management system provided by the present invention specifically includes a power management module, a central processing unit and a wake-up module. Among them, the power management module is connected to the central processing unit in communication, the power management module is also electrically connected to the lead-acid battery, the wake-up module is connected to the power management module in communication, the power management module is electrically connected to the rectifier filter circuit, the central processing unit is also connected to the digital isolation transmission module in communication, the central processing unit is also connected to the output current monitoring and measuring circuit, the central processing unit is also connected to the latch circuit, and the wake-up module is also connected to the digital isolation transmission module in communication.

[0042] The power management module is used to receive the electrical signal of the lead-acid battery and the second output electrical signal to obtain power, and to supply power to the vehicle starting components; the central processing unit is used to receive overvoltage and undervoltage signals, overtemperature signals and / or overcurrent signals in the awake state, and output a shutdown signal in response to the overvoltage and undervoltage signals, and output a current threshold adjustment signal in response to the overtemperature signal and / or overcurrent signal. Among them, the power management module and the central processing unit are chip modules that the battery management system usually has. There will be no more examples of other functions and chip models of the power management module and the central processing unit in the battery management system. For related content, please refer to the existing technology.

[0043] In an embodiment of the present invention, a communication connection is also established between the wake-up module and the digital isolation transmission module, so as to receive overvoltage and undervoltage signals, overtemperature signals and / or overcurrent signals issued by the redundant power supply circuit of the vehicle when the central processing unit is in a sleep state. At the same time, the wake-up module is configured with a wake-up strategy, and can output a wake-up signal to the power management module in response to the overvoltage and undervoltage signals, overtemperature signals and / or overcurrent signals, so that the power management module wakes up the central processing unit in response to the wake-up signal, so that the central processing unit re-receives the aforementioned overvoltage and undervoltage signals, overtemperature signals and / or overcurrent signals, and executes the tasks of the battery management system in the wake-up state in the aforementioned embodiment.

[0044] Through the solution provided by the embodiment of the present invention, the application scenarios of the battery management system can be further expanded. When the whole vehicle is in the parked sleep state, the abnormality of the vehicle's redundant power supply circuit can be read by the wake-up chip, so as to issue protection instructions such as shutdown signals in time to protect the components of the vehicle's redundant power supply circuit from damage, thereby further improving the reliability of the vehicle's redundant power supply circuit.

[0045] According to an embodiment of the present invention, an embodiment of a vehicle redundant power supply method is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0046] In this embodiment, a vehicle redundant power supply method is provided, which can be used for the above-mentioned vehicle redundant power supply circuit. Figure 3 is a flow chart of a vehicle redundant power supply method according to an embodiment of the present invention, the flow chart comprising the following steps:

[0047] Step S301, receiving a first output electrical signal of a power battery through a power conversion circuit;

[0048] Step S302, inverting and reducing the voltage of the first output electrical signal through a power conversion circuit to obtain an AC electrical signal;

[0049] Step S303, rectifying and filtering the AC signal through a rectifying and filtering circuit to obtain a second output electrical signal adapted to the voltage of the vehicle's weak current components;

[0050] Step S304, transmitting the second output electrical signal to the vehicle's weak-current components.

[0051] In some optional implementation manners, before step S302, the method further includes:

[0052] Step a1, converting the received first output electrical signal into a third output electrical signal with a reduced voltage through a high-voltage to low-voltage non-isolated power supply, and sending the third output electrical signal to the digital isolation transmission module to power the digital isolation transmission module;

[0053] Step a2, receiving the first output electrical signal through the overvoltage and undervoltage protection circuit, and determining whether an overvoltage or undervoltage phenomenon occurs;

[0054] Step a3, when an overvoltage or undervoltage phenomenon occurs, an overvoltage or undervoltage signal is sent to a digital isolation transmission module through an overvoltage or undervoltage protection circuit;

[0055] Step a4, transmitting the overvoltage and undervoltage signals to the battery management system through the digital isolation transmission module, so that the battery management system outputs a shutdown signal in response to the overvoltage and undervoltage signals, and the shutdown signal reaches the overvoltage and undervoltage protection circuit through the latch circuit and the photocoupler;

[0056] Step a5, responding to the shutdown signal through the overvoltage and undervoltage protection circuit, disconnecting the connection with the high-voltage to low-voltage non-isolated power supply, so that the power conversion control chip stops working;

[0057] Step a6: When no overvoltage or undervoltage phenomenon occurs, execute step S302.

[0058] In some optional implementations, step S302 includes:

[0059] Step b1, outputting the third output electrical signal to the power conversion control chip through the high-voltage to low-voltage non-isolated power supply to power the power conversion control chip, so as to start the power conversion control chip;

[0060] Step b2, sending a pulse signal to the power conversion circuit through the power conversion control chip;

[0061] Step b3, controlling the power conversion circuit to adjust the voltage conversion ratio according to the pulse signal;

[0062] Step b4, converting the first output electrical signal into an AC electrical signal according to the transformation ratio through a power conversion circuit.

[0063] In some optional implementations, the vehicle redundant power supply method provided by the present invention further includes:

[0064] Step c1, receiving a third output electrical signal through an input current detection module and a temperature detection module;

[0065] Step c2, performing overcurrent detection of the input current according to the third output electrical signal by the input current detection module;

[0066] Step c3, performing over-temperature detection of the input current according to the third output electrical signal by the temperature detection module;

[0067] Step c4, controlling the input current detection module to output an overcurrent signal to the digital isolation transmission module when an overcurrent phenomenon is detected;

[0068] Step c5, controlling the temperature detection module to output an over-temperature signal to the digital isolation transmission module when an over-temperature phenomenon is detected;

[0069] Step c6, controlling the digital isolation transmission module to forward the overcurrent signal and / or the overtemperature signal to the battery management system, so that the battery management system generates a current threshold adjustment signal in response to the overcurrent signal or the overtemperature signal, and sends the current threshold adjustment signal to the output current monitoring and measurement circuit;

[0070] Step c7, controlling the output current monitoring and measuring circuit to detect whether the second output electrical signal has an output current overcurrent problem, and also generating a current threshold adjustment signal when the output current overcurrent is detected;

[0071] Step c8, controlling the output current monitoring and measuring circuit to send the current threshold adjustment signal to the voltage and current feedback circuit;

[0072] Step c9, controlling the output voltage monitoring and measuring circuit to detect whether the second output electrical signal has an output voltage overvoltage problem, and generating a voltage threshold adjustment signal when the output voltage overvoltage is detected;

[0073] Step c10, controlling the output voltage monitoring and measuring circuit to send a voltage threshold adjustment signal to the voltage and current feedback circuit;

[0074] Step c11, controlling the voltage and current feedback circuit to respond to the received voltage threshold adjustment signal or current threshold adjustment signal to generate a power adjustment signal, and feeding back the power adjustment signal to the power conversion control chip through a linear photocoupler;

[0075] Step c12, controlling the power conversion control chip to output a pulse signal to the power conversion circuit in response to the power adjustment signal, so as to adjust the transformation ratio of the power conversion circuit, so as to adjust the magnitudes of the second output electrical signal and the first output electrical signal.

[0076] The detailed principle explanations of the method steps of the embodiments of the present invention have been described in the relevant descriptions of the aforementioned circuit embodiments, and reference may be made to the relevant descriptions of the aforementioned circuit embodiments, and will not be repeated here.

[0077] In order to facilitate a full understanding of the technical solution provided by the present invention, in a specific application embodiment, including the complete method steps in the above method embodiment, refer to Figure 4 , the specific steps are as follows.

[0078] Step 1: After power-on, the first output electrical signal of the power battery is sent to the overvoltage and undervoltage protection circuit to start working, and the overvoltage and undervoltage protection circuit determines whether the power battery voltage is overvoltage or undervoltage. If overvoltage or undervoltage occurs, the overvoltage and undervoltage protection circuit outputs an overvoltage and undervoltage signal. If no overvoltage or undervoltage occurs, it enters Step 4.

[0079] Step 2: The overvoltage and undervoltage signals are transmitted to the wake-up module and the central processing unit of the battery management system through the digital isolation transmission module; when the battery management system is in a dormant state, the overvoltage and undervoltage signals are used to wake up the central processing unit through the wake-up module, and then the overvoltage and undervoltage signals are captured by the central processing unit; when the battery management system is in a working state, the overvoltage and undervoltage signals are directly captured by the central processing unit.

[0080] Step 3: The central processor of the battery management system outputs a shutdown signal in response to the overvoltage and undervoltage signals. The shutdown signal is latched by the latch circuit to prevent the shutdown signal from failing after the battery management system goes into sleep. The latch circuit outputs the shutdown signal to the overvoltage and undervoltage protection circuit through the photocoupler to close the connection with the high-voltage to low-voltage non-isolated power supply, thereby disconnecting the power supply of the power battery, so that the power conversion control chip stops working and shuts down the vehicle's redundant power supply circuit.

[0081] Step 4: The high-voltage to low-voltage non-isolated power supply starts working and supplies power to the input current detection module, temperature detection module, digital isolation transmission module, and power conversion control chip, so that the above modules start to work normally. The power conversion control chip outputs a PWM pulse signal to the power conversion circuit to start the power conversion circuit. After the power conversion circuit works, it receives the first output electrical signal processed by the electromagnetic filter circuit, thereby reducing the voltage and inverting the first output electrical signal to obtain an AC signal.

[0082] The rectifier filter circuit receives the AC signal and starts to work to output the second output signal. The voltage and current of the second output signal are sampled through the output voltage monitoring and measuring circuit and the output current monitoring and measuring circuit, and the change between the output voltage and current and the expected voltage and current is obtained through the voltage and current feedback circuit. The voltage and current feedback circuit sends the change between the output voltage and current and the expected voltage and current to the power conversion control chip through a linear optocoupler to adjust the PWM duty cycle or frequency (determined by the power control chip), so as to stabilize the output voltage and current of the power conversion circuit.

[0083] Input current over-current detection and temperature over-temperature detection are performed simultaneously. Step 5 to Step 12 are the input current over-current detection flow chart.

[0084] Step 5: Input current detection module to detect whether overcurrent occurs; if not, return to Step 4, if yes, enter Step 6.

[0085] Step 6: The present invention sets at least two overcurrent thresholds to indicate different overcurrent levels. For example, the input current detection module can detect the existence of both primary and secondary overcurrent, or only primary overcurrent. Correspondingly, the input current detection module can output overcurrent signal 1 and overcurrent signal 2, or only output overcurrent signal 1.

[0086] Step 7: When the battery management system is in sleep mode, the overcurrent signal 1 and / or overcurrent signal 2 is sent to the wake-up module through the digital isolation transmission module, which first wakes up the battery management system, and then the central processing unit captures the overcurrent signal 1 and / or overcurrent signal 2; when the battery management system is in working mode, the overcurrent signal 1 and / or overcurrent signal 2 is directly captured by the central processing unit through the digital isolation transmission module.

[0087] Step 8: Overcurrent signal 1 (which can be tested according to the actual environment and working conditions, and defined according to the maximum allowable current of the selected components and the actual derating design) belongs to the first level overcurrent warning, and overcurrent signal 2 (which can be tested according to the actual environment and working conditions, and defined according to the maximum allowable current of the selected components and the actual derating design) belongs to the second level overcurrent warning. When the central processor detects the overcurrent signal 1 and / or the overcurrent signal 2 for the first time, it sends the current threshold adjustment signal 1 to the output current monitoring circuit. The current threshold adjustment signal 1 is used to adjust the output current of the power conversion circuit to 75% of the rated current (the appropriate first current threshold can be selected according to the actual working condition test, which is only an example and not limited to this). The voltage and current feedback circuit feeds back the current threshold adjustment signal 1 to the power conversion control chip through the linear optocoupler. The power conversion control chip controls the frequency or duty cycle (determined by the chip characteristics) of its PWM signal to reduce the output power of the power conversion circuit, which will simultaneously affect the input power reduction. Since the input voltage remains unchanged, the input current is reduced, thereby achieving the purpose of protecting the circuit.

[0088] Step 9: The input current detection module detects for the second time whether there is a primary overcurrent. If not, it returns to Step 4. If so, it goes to Step 10.

[0089] Step 10: The input current detection module outputs the overcurrent signal 1 for the second time; when the battery management system is in the sleep state, the overcurrent signal 1 is transmitted to the wake-up module through the digital isolation transmission module to wake up the battery management system, and the central processing unit captures the overcurrent signal 1; when the battery management system is in the working state, the overcurrent signal 1 is directly captured by the central processing unit through the digital isolation transmission module.

[0090] Step 11: When the central processing unit captures the overcurrent signal 1, it will send a current threshold adjustment signal 2 to the output current monitoring circuit. After receiving the current threshold adjustment signal 2, the output current monitoring circuit will adjust the second output current threshold again (for example, down to 50%), so that the output power of the redundant power supply circuit is reduced again.

[0091] Step 12: The input current detection module detects for the third time whether there is a primary overcurrent. If not, it returns to Step 4. If so, it goes to Step 3, generates a shutdown signal, and shuts down the redundant power supply circuit.

[0092] Input current over-current detection and temperature over-temperature detection are performed simultaneously; step 13 to step 20 is the temperature over-temperature detection flow chart.

[0093] Step 13: The temperature detection module detects whether over-temperature occurs. If not, return to Step 4. If yes, enter Step 14.

[0094] Step 14: The temperature detection module can also set multiple temperature detection thresholds, for example, at least two, so as to achieve the purpose of multi-level temperature monitoring. For example, the embodiment of the present invention sets two temperature detection thresholds. When the current temperature exceeds the corresponding temperature detection threshold, the detection of the first overtemperature and the second overtemperature is realized. Among them, it is possible that the first overtemperature and the second overtemperature exist at the same time, or there is only the first overtemperature. Corresponding to the first overtemperature, the temperature detection module only outputs the overtemperature signal 1, and corresponding to the second overtemperature, the temperature detection module outputs the overtemperature signal 1 and the overtemperature signal 2. The overtemperature signal 1 and the overtemperature signal 2 can test their temperatures according to the actual environment and working conditions, and define the specific temperature thresholds according to the temperature resistance range of the selected components.

[0095] Step 15: When the battery management system is in a dormant state, the over-temperature signal 1 and / or the over-temperature signal 2 is transmitted to the wake-up module through the digital isolation transmission module to wake up the battery management system, and the central processing unit then captures the over-temperature signal 1 and / or the over-temperature signal 2; when the battery management system is in a working state, the over-temperature signal 1 and / or the over-temperature signal 2 is directly captured by the central processing unit through the digital isolation transmission module.

[0096] Step 16: When the central processing unit captures the over-temperature signal 1 and / or the over-temperature signal 2 for the first time, the output current threshold adjustment signal 1 is output; after receiving the current threshold adjustment signal 1, the output current monitoring circuit adjusts the current threshold to 75% of the rated output current (a suitable first current threshold can be selected according to actual tests), and then sends a corresponding signal to the voltage and current feedback circuit. The voltage and current feedback circuit feeds back the adjusted current threshold signal to the power conversion control chip through the linear optocoupler. The power conversion control chip controls the frequency or duty cycle (determined by the chip characteristics) of its PWM signal to reduce the output power of the power conversion circuit, thereby achieving the effect of reducing the temperature rise.

[0097] Step 17: The temperature detection module detects for the second time whether there is a first-level over-temperature. If not, it returns to Step 4. If so, it goes to Step 18.

[0098] Step 18: When the temperature detection module outputs the over-temperature signal 1 for the second time; if the battery management system is in sleep state, the over-temperature signal 1 is transmitted to the wake-up module through the digital isolation transmission module to wake up the battery management system, and the central processing unit captures the over-temperature signal 1; if the battery management system is in working state, the over-temperature signal 1 is directly captured by the central processing unit through the digital isolation transmission module.

[0099] Step 19: When the central processing unit captures the over-temperature signal 1 for the second time, it will send a current threshold adjustment signal 2 to the output current monitoring circuit. After receiving the current threshold adjustment signal 2, the output current monitoring circuit adjusts the output second current threshold (for example, to 50%), thereby reducing the output power of the vehicle redundant power supply circuit again, achieving a further cooling effect.

[0100] Step 20: The temperature detection module detects for the third time whether there is a first-level over-temperature. If not, it returns to Step 4. If so, it goes to Step 3, generates a shutdown signal, and shuts down the redundant power supply circuit.

[0101] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A vehicle redundant power supply circuit, characterized in that: The vehicle redundant power supply circuit includes: a power conversion circuit and a rectification and filtering circuit; The power conversion circuit is electrically connected to the power battery, the power conversion circuit is electrically connected to the rectification and filtering circuit, and the rectification and filtering circuit is electrically connected to the vehicle's weak-current components; the power conversion circuit is used to receive a first output electrical signal from the power battery, and to invert and step down the first output electrical signal to obtain an AC signal; the rectification and filtering circuit is used to rectify and filter the AC signal to obtain a second output electrical signal that is adapted to the voltage of the vehicle's weak-current components, and to transmit the second output electrical signal to the vehicle's weak-current components, and the vehicle's weak-current components include at least one of a battery management system and a vehicle sensor.

2. The vehicle redundant power supply circuit according to claim 1, characterized in that: The vehicle redundant power supply circuit also includes: a high-voltage to low-voltage non-isolated power supply and a power conversion control chip; The high-voltage-to-low-voltage non-isolated power supply is electrically connected to the power battery and the power conversion control chip respectively, and the high-voltage-to-low-voltage non-isolated power supply is used to reduce the voltage of the first output electrical signal to obtain a third output electrical signal, and the third output electrical signal is used to power the power conversion control chip; The power conversion circuit is also electrically connected to the power conversion control chip, and the power conversion control chip is used to control the transformation ratio of the power conversion circuit through a pulse signal. The power conversion circuit is used to convert the first output electrical signal into the AC electrical signal according to the transformation ratio.

3. The vehicle redundant power supply circuit according to claim 2, characterized in that: The vehicle redundant power supply circuit also includes an overvoltage and undervoltage protection circuit, an electromagnetic filter circuit and a fuse; the overvoltage and undervoltage protection circuit is electrically connected between the high-voltage to low-voltage non-isolated power supply and the power battery, and the overvoltage and undervoltage protection circuit is communicatively connected to the power conversion control chip; the electromagnetic filter circuit and the fuse are electrically connected in series between the power conversion circuit and the power battery; The overvoltage and undervoltage protection circuit is used to detect overvoltage or undervoltage of the power battery, and when overvoltage or undervoltage is detected, it is used to cut off the connection with the high-voltage to low-voltage non-isolated power supply, so that the power conversion control chip stops working; The fuse is used to melt when an overcurrent occurs in the first output electrical signal; The electromagnetic filtering circuit is used to perform electromagnetic filtering on the first output electrical signal.

4. The vehicle redundant power supply circuit according to claim 3, characterized in that: The vehicle redundant power supply circuit also includes: a digital isolation transmission module, a latch circuit and a photoelectric coupler; the digital isolation transmission module is communicatively connected to the overvoltage and undervoltage protection circuit, the digital isolation transmission module is electrically connected to the high-voltage to low-voltage non-isolated power supply, the digital isolation transmission module is also communicatively connected to the battery management system, the latch circuit is communicatively connected to the battery management system, the latch circuit is communicatively connected to the photoelectric coupler, and the photoelectric coupler is communicatively connected to the overvoltage and undervoltage protection circuit; The high-voltage to low-voltage non-isolated power supply is also used to output the third output electrical signal to the digital isolation transmission module to supply power to the digital isolation transmission module; The overvoltage and undervoltage protection circuit is used to output an overvoltage and undervoltage signal to the digital isolation transmission module when an overvoltage or undervoltage phenomenon is detected, and the digital isolation transmission module is used to transmit the overvoltage and undervoltage signal to the battery management system; The battery management system is used to output a shutdown signal in response to the overvoltage and undervoltage signal, and the shutdown signal reaches the overvoltage and undervoltage protection circuit through the latch circuit and the photocoupler; The overvoltage and undervoltage protection circuit is also used to respond to the shutdown signal to shut down the connection with the high-voltage to low-voltage non-isolated power supply, so that the power conversion control chip stops working.

5. The vehicle redundant power supply circuit according to claim 4, characterized in that: Also includes: Input current detection module, temperature detection module, output current monitoring and measuring circuit, output voltage monitoring and measuring circuit, voltage and current feedback circuit and linear photoelectric coupler; The input current detection module and the temperature detection module are both electrically connected to the high-voltage to low-voltage non-isolated power supply, the input current detection module and the temperature detection module are also communicatively connected to the digital isolation transmission module, the output current monitoring and measurement circuit and the output voltage monitoring and measurement circuit are both electrically connected to the rectifier and filter circuit, the output current monitoring and measurement circuit and the output voltage monitoring and measurement circuit are also electrically connected to the voltage and current feedback circuit, the voltage and current feedback circuit is communicatively connected to the linear optocoupler, the linear optocoupler is communicatively connected to the power conversion control chip, and the battery management system is also communicatively connected to the output current monitoring and measurement circuit; The input current detection module and the temperature detection module are both used to receive the third output electrical signal output by the high-voltage to low-voltage non-isolated power supply, the input current detection module is used to perform overcurrent detection of the input current according to the third output electrical signal, and the temperature detection module is used to perform overtemperature detection of the input current according to the third output electrical signal; The input current detection module outputs an overcurrent signal to the digital isolation transmission module when an overcurrent phenomenon is detected, and the temperature detection module outputs an overtemperature signal to the digital isolation transmission module when an overtemperature phenomenon is detected; The digital isolation transmission module is used to forward the over-current signal and / or the over-temperature signal to the battery management system; The battery management system is used to generate a current threshold adjustment signal in response to the over-current signal or the over-temperature signal, and send the current threshold adjustment signal to the output current monitoring and measuring circuit; The output current monitoring and measuring circuit is used to detect whether the second output electrical signal output by the rectifier and filter circuit has an output current overcurrent phenomenon, and also generates the current threshold adjustment signal when the output current overcurrent phenomenon is detected; The output current monitoring and measuring circuit is also used to send the current threshold adjustment signal to the voltage and current feedback circuit; The output voltage monitoring and measuring circuit is used to detect whether the second output electrical signal output by the rectifier and filter circuit has an output voltage overvoltage phenomenon, and to generate a voltage threshold adjustment signal when the output voltage overvoltage phenomenon is detected, and the output voltage monitoring and measuring circuit is also used to send the voltage threshold adjustment signal to the voltage and current feedback circuit; The voltage-current feedback circuit generates a power adjustment signal in response to the received voltage threshold adjustment signal or the current threshold adjustment signal, and feeds back the power adjustment signal to the power conversion control chip through the linear photocoupler; The power conversion control chip outputs the pulse signal to the power conversion circuit in response to the power adjustment signal to adjust the voltage conversion ratio of the power conversion circuit; The battery management system is also used to generate the shutdown signal when the overcurrent signal or the overtemperature signal is received more than a preset number of times, and send the shutdown signal to the overvoltage and undervoltage protection circuit.

6. The vehicle redundant power supply circuit according to claim 5, characterized in that: The battery management system includes a power management module, a central processing unit and a wake-up module; the power management module is communicatively connected to the central processing unit, the power management module is also electrically connected to the lead-acid battery, the wake-up module is communicatively connected to the power management module, the power management module is electrically connected to the rectifier and filter circuit, the central processing unit is also communicatively connected to the digital isolation transmission module, the central processing unit is also communicatively connected to the output current monitoring and measuring circuit, the central processing unit is also communicatively connected to the latch circuit, and the wake-up module is also communicatively connected to the digital isolation transmission module; The power management module is used to receive the electrical signal of the lead-acid battery and the second output electrical signal to obtain power, and to supply power to the vehicle starting component; The central processing unit is used to receive the overvoltage / undervoltage signal, the overtemperature signal and / or the overcurrent signal in the awake state, and output the shutdown signal in response to the overvoltage / undervoltage signal, and output the current threshold adjustment signal in response to the overtemperature signal and / or the overcurrent signal; The wake-up module is used to receive the overvoltage and undervoltage signals, the overtemperature signal and / or the overcurrent signal when the central processing unit is in a sleep state, and output a wake-up signal to the power management module in response to the overvoltage and undervoltage signals, the overtemperature signal and / or the overcurrent signal. The power management module wakes up the central processing unit in response to the wake-up signal so that the central processing unit performs the task in the wake-up state.

7. A vehicle redundant power supply method, characterized in that: Applied to a vehicle redundant power supply circuit, the method comprises: Receiving a first output electrical signal of the power battery through a power conversion circuit; Inverting and reducing the voltage of the first output electrical signal by the power conversion circuit to obtain an AC electrical signal; The AC signal is rectified and filtered by a rectifier and filter circuit to obtain a second output electrical signal adapted to the voltage of the vehicle's weak current components; The second output electrical signal is transmitted to the vehicle weak-current component.

8. The method according to claim 7, characterized in that Before the first output electrical signal is inverted and stepped down by the power conversion circuit to obtain an AC electrical signal, the method further includes: Converting the received first output electrical signal into a third output electrical signal with a reduced voltage through a high-voltage to low-voltage non-isolated power supply, and sending the third output electrical signal to a digital isolation transmission module to power the digital isolation transmission module; The overvoltage and undervoltage protection circuit receives the first output electrical signal and determines whether an overvoltage or undervoltage phenomenon occurs. When an overvoltage or undervoltage phenomenon occurs, an overvoltage or undervoltage signal is sent to the digital isolation transmission module through the overvoltage or undervoltage protection circuit; The overvoltage and undervoltage signals are transmitted to the battery management system through the digital isolation transmission module, so that the battery management system outputs a shutdown signal in response to the overvoltage and undervoltage signals, and the shutdown signal reaches the overvoltage and undervoltage protection circuit through the latch circuit and the photocoupler; The overvoltage and undervoltage protection circuit responds to the shutdown signal to disconnect the high-voltage to low-voltage non-isolated power supply, so that the power conversion control chip stops working; When no overvoltage or undervoltage phenomenon occurs, the step of inverting and reducing the voltage of the first output electrical signal by the power conversion circuit is performed.

9. The method according to claim 8, characterized in that The step of inverting and reducing the voltage of the first output electrical signal by the power conversion circuit to obtain an AC electrical signal includes: Outputting the third output electrical signal to the power conversion control chip through the high-voltage to low-voltage non-isolated power supply to supply power, so as to start the power conversion control chip; Sending a pulse signal to a power conversion circuit via the power conversion control chip; Controlling the power conversion circuit to adjust the voltage conversion ratio according to the pulse signal; The first output electrical signal is converted into the AC electrical signal according to the transformation ratio by the power conversion circuit.

10. The method according to claim 9, characterized in that The method further comprises: Receiving the third output electrical signal through the input current detection module and the temperature detection module; Performing overcurrent detection of input current according to the third output electrical signal by the input current detection module; Performing over-temperature detection of the input current according to the third output electrical signal by the temperature detection module; Controlling the input current detection module to output an overcurrent signal to the digital isolation transmission module when an overcurrent phenomenon is detected; Controlling the temperature detection module to output an over-temperature signal to the digital isolation transmission module when an over-temperature phenomenon is detected; Controlling the digital isolation transmission module to forward the overcurrent signal and / or the overtemperature signal to the battery management system, so that the battery management system generates a current threshold adjustment signal in response to the overcurrent signal or the overtemperature signal, and sends the current threshold adjustment signal to the output current monitoring measurement circuit; Controlling the output current monitoring and measuring circuit to detect whether the second output electrical signal has an output current overcurrent problem, and also generating the current threshold adjustment signal when the output current overcurrent is detected; Controlling the output current monitoring and measuring circuit to send the current threshold adjustment signal to the voltage and current feedback circuit; Controlling the output voltage monitoring and measuring circuit to detect whether the output voltage of the second output electrical signal is over-voltage, and generating a voltage threshold adjustment signal when the output voltage is over-voltage; Controlling the output voltage monitoring and measuring circuit to send the voltage threshold adjustment signal to the voltage and current feedback circuit; Controlling the voltage and current feedback circuit to respond to the received voltage threshold adjustment signal or the current threshold adjustment signal to generate a power adjustment signal, and feeding back the power adjustment signal to the power conversion control chip through a linear optocoupler; The power conversion control chip is controlled to output the pulse signal to the power conversion circuit in response to the power adjustment signal to adjust the transformation ratio of the power conversion circuit to adjust the magnitude of the second output electrical signal and the first output electrical signal.

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