Power supply isolation control system and method, controller and vehicle

Abstract

The invention relates to a power supply isolation control system and method, a controller and a vehicle, and relates to the technical field of power supply management. The power supply isolation control system comprises a controller and an isolation driving circuit; wherein the controller is connected with the first power supply and the first grounding end; and the isolation driving circuit is electrically connected with the high-voltage side loop and is used for electrically isolating the high-voltage side loop and then being in communication connection with the controller. The controller is directly connected with the first power supply and the first grounding end, so that the controller can normally operate under the low-voltage side system, and then the isolation driving circuit is used for electrically isolating the high-voltage side loop, so that the communication connection between the high-voltage side loop and the controller is realized; according to the technical scheme, the controller arranged in the low-voltage side system can monitor and control the high-voltage side loop in the range of the working voltage of the controller, so that an additional controller does not need to be arranged in the high-voltage side loop, the number of needed controllers is reduced, and the cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of power management technology, and in particular to a power isolation control system, method, controller and vehicle. Background Art

[0002] High and low voltage power distribution refers to the technology of dividing electric energy into high voltage and low voltage parts for distribution, transmission and use in a power system according to different voltage levels. For example, in the high and low voltage power distribution of electric vehicles, the high voltage system, as the core of the electric vehicle, is responsible for distributing electric energy from the high voltage side circuit of the power battery pack to the high voltage system of the vehicle to drive the vehicle. The low voltage system receives power from the high voltage side circuit through a DC converter and converts it into low voltage, which is supplied to all electrical equipment and electronic devices in the vehicle except the high voltage system, such as lighting, audio, control systems, etc., to ensure the normal operation of the vehicle's auxiliary functions and the comfort of passengers.

[0003] In the high and low voltage power distribution control of electric vehicles, since the high voltage system and the low voltage system in the electric vehicle have different functions and voltage levels, at present, at least two independent microcontroller units (MCU) are usually used for separate control, and then the multiple independent MCUs are electrically isolated and communicated to achieve the interaction between the high voltage system and the low voltage system. However, using multiple MCUs to control the high and low voltage power distribution separately increases the cost, and the computing resources of the MCU may not be fully utilized. Summary of the invention

[0004] The embodiments of the present application provide a power isolation control system, method, controller and vehicle, which reduce the number of MCUs in high and low voltage power distribution control to at least partially solve the above-mentioned technical problems.

[0005] In order to achieve the above object, according to a first aspect of the present application, a power supply isolation control system is provided, comprising:

[0006] A controller connected to the first power source and the first ground terminal;

[0007] The isolation drive circuit is electrically connected to the high-voltage side loop and is used to electrically isolate the high-voltage side loop and then communicate with the controller; wherein the high-voltage side loop is connected to a second power supply and a second ground terminal.

[0008] Optionally, the high-voltage side circuit includes a pre-charge circuit, and the isolation drive circuit includes a pre-charge detection sub-circuit;

[0009] The pre-charge detection sub-circuit is electrically connected to the pre-charge loop, and is used to collect the pre-charge voltage signal of the pre-charge loop, and electrically isolate the pre-charge voltage signal to generate a pre-charge completion signal;

[0010] The controller is used to cut off the pre-filling circuit according to the pre-filling completion signal.

[0011] Optionally, the precharge detection subcircuit includes a reference output structure and a first isolation structure;

[0012] The reference output structure is electrically connected to the pre-charge circuit, and is used to collect the pre-charge voltage signal of the pre-charge circuit, and generate a reference signal based on the pre-charge voltage signal;

[0013] The first isolation structure is connected to the reference output structure and the controller, and is used to isolate the reference signal to obtain a pre-charge completion signal.

[0014] Optionally, the reference output structure includes a first resistor, a second resistor and a voltage regulator;

[0015] The voltage regulator includes a reference terminal and an input terminal connected to the first resistor and the second resistor, and an output terminal connected to the first isolation structure;

[0016] The first resistor includes a first end connected to the pre-charge loop and a second end connected to the first end of the second resistor, the reference end and the input end of the regulator;

[0017] The second resistor also includes a second terminal connected to a second ground terminal.

[0018] Optionally, the reference output structure further includes a first capacitor;

[0019] The first capacitor includes a first end connected to the second end of the second resistor and the input end of the regulator, and a second end connected to the second ground end.

[0020] Optionally, the first isolation structure includes a second capacitor;

[0021] The second capacitor includes a first end connected to the reference output structure and a second end connected to the controller.

[0022] Optionally, the isolation drive circuit includes a pre-charge enabling sub-circuit;

[0023] The controller is also used to generate a pre-charge enable signal according to the power-on instruction and the pre-charge completion signal;

[0024] The pre-charge enabling sub-circuit is electrically connected to the controller, and is used to control the on-off of the pre-charge loop after unidirectionally isolating the pre-charge enabling signal.

[0025] Optionally, the precharge enabling subcircuit includes a switch structure and a second isolation structure;

[0026] The second isolation structure is connected to the controller and the switch structure, and is used to generate a pre-charge control signal according to the pre-charge enable signal and to unidirectionally isolate the pre-charge enable signal;

[0027] The switch structure is connected to the second isolation structure and is used to control the on and off of the pre-charging loop according to the pre-charging control signal.

[0028] Optionally, the second isolation structure includes a third capacitor and a photocoupler;

[0029] The photocoupler includes an anode connected to a first end of a third capacitor and the controller, a cathode connected to a second end of the third capacitor and the first ground, a collector connected to the switch structure, and an emitter connected to the second ground.

[0030] Optionally, the high-voltage side circuit includes a power main circuit, and the isolation drive circuit further includes a drive subcircuit;

[0031] The driving sub-circuit comprises an isolation driving chip and a first switch tube;

[0032] The isolation driver chip includes a signal input terminal connected to the controller and a signal output terminal connected to the first switch tube; the isolation driver chip is used to generate a drive signal in a first state according to a power supply start signal; wherein the power supply start signal is generated by the controller based on the pre-charging completion signal.

[0033] The first switch tube includes a control electrode connected to the signal output terminal of the isolation driving chip to receive the driving signal, a first electrode connected to the second power supply, and a second electrode connected to the load.

[0034] Optionally, the isolation driving circuit further includes a monitoring subcircuit;

[0035] The monitoring subcircuit includes an isolation monitoring chip; the isolation monitoring chip includes a sampling terminal connected to the main power circuit, a first output terminal connected to the controller, and a second output terminal connected to the signal input terminal of the isolation driving chip; the isolation monitoring chip is used to collect the current signal of the main power circuit to generate a power-off control signal

[0036] The isolation driving chip is used to generate a driving signal in a second state according to the power-off control signal to control the disconnection of the main power circuit.

[0037] Optionally, the isolation monitoring chip is further used to generate the power-off control signal according to the current signal, and send the power-off control signal to the isolation driving chip; and / or

[0038] The controller is also connected to the isolation driver chip and the isolation monitoring chip, and is used to receive the current signal, obtain the power-off control signal according to the current signal, and send the power-off control signal to the isolation driver chip.

[0039] According to a second aspect of the present application, a power isolation control method is provided, which is used to control the above-mentioned power isolation control system, wherein the isolation drive circuit includes a pre-charge detection sub-circuit and a pre-charge enabling sub-circuit, and the method includes:

[0040] receiving a power-on instruction, generating a pre-charge enable signal of a first state based on the power-on instruction, and outputting the pre-charge enable signal of the first state to the pre-charge enable sub-circuit to control the conduction of the pre-charge loop;

[0041] receiving a pre-charge completion signal from the pre-charge detection sub-circuit, and generating a power supply start signal based on the pre-charge completion signal to control the conduction of the power main circuit;

[0042] A pre-charge enable signal of a second state is generated based on the power supply start signal, and the pre-charge enable signal of the second state is output to the pre-charge enable sub-circuit to control the pre-charge loop to be disconnected.

[0043] Optionally, the isolation driving circuit further includes a monitoring subcircuit and a driving subcircuit, and the method includes:

[0044] Outputting the power supply start signal to the driving sub-circuit to control the conduction of the main power supply circuit;

[0045] A current signal is received from the monitoring subcircuit, the current signal is analyzed to obtain the power-off control signal, and the power-off control signal is output to the driving subcircuit to control the disconnection of the main power supply circuit.

[0046] According to a third aspect of the present application, a controller is provided, which is used to execute a computer program of the above-mentioned power isolation control method.

[0047] According to a fourth aspect of the present application, a storage medium is provided, comprising a computer program that can be loaded by a processor and executed in the above-mentioned power isolation control method.

[0048] According to a fifth aspect of the present application, a vehicle is provided, comprising the above-mentioned power isolation control system or the above-mentioned controller.

[0049] To summarize, in the embodiment of the present application, the controller is directly connected to the first power supply and the first ground terminal to enable the normal operation of the controller in the low-voltage side system, and then the high-voltage side circuit is electrically isolated through the isolation drive circuit to achieve a communication connection between the high-voltage side circuit and the controller, so that the controller arranged in the low-voltage side system can monitor and control the high-voltage side circuit within the range of its operating voltage, thereby eliminating the need to arrange an additional controller in the high-voltage side circuit, thereby reducing the number of required controllers and reducing costs.

[0050] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0052] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

[0053] Figure 1 is a schematic diagram of a high and low voltage power distribution system in the related art;

[0054] Figure 2 is a schematic diagram of a power isolation control system provided in an exemplary embodiment of the present disclosure;

[0055] Figure 3 is a block diagram of a controller and an isolation drive circuit provided in an exemplary embodiment of the present disclosure;

[0056] Figure 4 Schematic diagram of circuit connection of a power isolation control system provided in an exemplary embodiment of the present disclosure.

[0057] Figure 5 is a flow chart of a pre-filling circuit control method provided in an exemplary embodiment of the present disclosure.

[0058] Figure 6 is a flowchart of a power main circuit control method provided in an exemplary embodiment of the present disclosure.

[0059] Explanation of the reference numerals: 1. controller; 2. isolation drive circuit; 21. pre-charge detection sub-circuit; 211. reference output structure; 212. first isolation structure; 22. pre-charge enable sub-circuit; 221. second isolation structure; 222. switch structure; 23. drive sub-circuit; 24. monitoring sub-circuit. DETAILED DESCRIPTION

[0060] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0061] First, based on the content of the background technology of the present application, the background of the present application is further explained. Figure 1 As shown, Figure 1 It is a schematic diagram of a high and low voltage power distribution system in the related art; the high and low voltage power distribution system includes a high voltage side system and a low voltage side system, the controller MCU1 in the low voltage side system is powered by the first power supply on the low voltage side, and the controller MCU2 in the high voltage side system is powered by the first power supply after isolation and transformation. The controller MCU1 controls the drive of the load low voltage module, for example, the control of electronic equipment such as audio, lighting, and wipers, while the controller MCU2 is specifically responsible for driving the control circuit on the high voltage side, and controls the on and off between the first power supply and the load through the control circuit. The load can be a motor used to drive the electric vehicle. Since the power supply voltages of the controllers MCU1 and MCU2 are different, the two operate at different voltage levels and are connected to different ground terminals. If communication data needs to be transmitted between the controllers MCU1 and MCU2, it can only be achieved by communication isolation. In summary, if a solution with multiple controllers is adopted, the communication delay between the multiple controllers will increase the system response time and affect the real-time control effect; and the communication data may be lost when it is transmitted between multiple controllers, which reduces the overall stability and reliability of the system. In addition, the solution with multiple controllers also requires more space, limits the flexibility of the internal design of the electric vehicle, and increases the cost.

[0062] Based on this, the technical solution of this application is proposed. According to the first aspect of this application, referring to Figures 2 to 4 The present application provides a power supply isolation control system, including a controller 1 and an isolation drive circuit 2; wherein the controller 1 is connected to a first power supply and a first ground terminal; the isolation drive circuit 2 is electrically connected to a high-voltage side loop, and is used to electrically isolate the high-voltage side loop and then communicate with the controller 1. wherein the high-voltage side loop is connected to a second power supply and a second ground terminal.

[0063] As an example, taking an electric vehicle as an example, the second power source may be a power battery, the output voltage of which is usually between 380V and 600V. It is the main power source of the electric vehicle and is responsible for providing sufficient electrical energy to the drive motor to ensure that the electric vehicle can run normally. The output of the first power source is lower than the output of the second power source. The first power source may be a low-voltage starting battery. The output of the first power source may be a lower voltage such as 3.3V or 12V. The first power source is mainly responsible for powering the low-voltage module inside the electric vehicle. The low-voltage module may be an electronic control system or an auxiliary electrical component. As an example, combined with Figure 2 , GND1 represents the first ground terminal, GND2 represents the second ground terminal, and the first ground terminal is adapted to the first power supply, and the second ground terminal is adapted to the second power supply.

[0064] As an example, the high-voltage side circuit may include a pre-charging circuit and a power supply main circuit; wherein the pre-charging circuit is used to limit the generation of instantaneous large current at the initial stage of powering on the electric vehicle to prevent the bus capacitor and other components in the load from being damaged by the impact. The power supply main circuit is the main line in the high-voltage system of the electric vehicle, responsible for transmitting the electric energy of the second power supply to high-voltage electrical equipment such as the drive motor or DC converter.

[0065] In the above implementation, the controller 1 is directly connected to the first power supply and the first ground terminal so that the controller 1 can operate normally in the low-voltage side system, and then the high-voltage side circuit is electrically isolated through the isolation drive circuit 2 to achieve a communication connection between the high-voltage side circuit and the controller 1, so that the controller 1 arranged in the low-voltage side system can monitor and control the high-voltage side circuit within the range of its operating voltage, thereby eliminating the need to arrange an additional controller 1 in the high-voltage side circuit, thereby reducing the number of required controllers 1 and reducing costs.

[0066] Reference Figure 3 In some embodiments, the high-voltage side circuit includes a pre-charging circuit, and the isolation driving circuit 2 includes a pre-charging detection sub-circuit 21; the pre-charging detection sub-circuit 21 is electrically connected to the pre-charging circuit, and is used to collect the pre-charging voltage signal of the pre-charging circuit, and electrically isolate the pre-charging voltage signal to generate a pre-charging completion signal; the controller 1 is used to cut off the pre-charging circuit according to the pre-charging completion signal.

[0067] As an example, the pre-charge detection subcircuit 21 includes a reference output structure 211 and a first isolation structure 212; the reference output structure 211 is electrically connected to the pre-charge circuit, and is used to collect the pre-charge voltage signal of the pre-charge circuit, and generate a reference signal based on the pre-charge voltage signal; the first isolation structure 212 is connected to the reference output structure 211 and the controller 1, and isolates the reference signal to obtain a pre-charge completion signal.

[0068] The reference signal is a voltage signal, whose amplitude is lower than the pre-charge voltage signal. As an example, the reference output structure 211 can generate the reference signal when the pre-charge voltage signal reaches a preset pre-charge voltage threshold.

[0069] In the above embodiment, the reference output structure 211 is directly electrically connected to the pre-charging circuit, so that the reference output structure 211 can directly collect the pre-charging voltage signal in the pre-charging circuit and output a reference signal with a lower amplitude, so that the first isolation structure 212 can effectively isolate the reference signal to obtain a pre-charging completion signal. At this time, the pre-charging voltage signal in the pre-charging circuit is converted into a pre-charging completion signal with a lower amplitude and output to the controller 1, so that the controller 1 working on the low-voltage side can correctly process the pre-charging completion signal.

[0070] In some embodiments, the reference output structure 211 includes a first resistor R1, a second resistor R2 and a regulator U1; the regulator U1 includes a reference end and an input end connected to the first resistor R1 and the second resistor R2, and an output end connected to the first isolation structure 212; the first resistor R1 includes a first end connected to the pre-charge loop and a second end connected to the first end of the second resistor R2, the reference end and the input end of the regulator U1; the second resistor R2 also includes a second end connected to the second ground end.

[0071] As an example, combining Figure 4 , VBET represents the second power supply, node A is the connection point between the pre-charge detection sub-circuit 21 and the pre-charge loop, and node B is the series connection point between the first resistor R1 and the second resistor R2. Since the second power supply is connected to the load, and the load exhibits a capacitive characteristic, therefore, when the pre-charge loop starts to conduct, the voltage in the pre-charge loop will flow to the load with a smaller impedance without passing through the pre-charge detection sub-circuit 21. At this time, the voltage difference across the first resistor R1 is zero. As the pre-charge loop continues to charge the load, the impedance of the load gradually increases until the voltage of the pre-charge loop stops flowing to the load and flows to the pre-charge detection sub-circuit 21. Specifically, the first resistor R1 and the second resistor R2 begin to divide the collected pre-charge voltage signal. At this time, the voltage of node A can be expressed as Among them, V bet1 is the output voltage of the second power supply; Rf1 and Rf2 are the resistance values ​​of the first resistor R1 and the second resistor R2 respectively, and R1 is the line resistance value in the pre-charge loop. The voltage value of node B can be expressed as The reference terminal of the voltage regulator U1 receives the voltage value of the node B. When the voltage value of the node B reaches a preset pre-charge voltage threshold, the voltage regulator U1 starts to output a reference signal.

[0072] In some embodiments, the reference output structure 211 further includes a first capacitor C1 ; the first capacitor C1 includes a first end connected to the second end of the second resistor R2 and the input end of the regulator U1 , and a second end connected to the second ground end.

[0073] In the above implementation, the second ground terminal can be filtered and anti-interference can be performed through the first capacitor C1, and the voltage change of the node B can also be smoothed through the first capacitor C1, so as to drive the voltage regulator U1 more stably.

[0074] In some embodiments, the first isolation structure 212 includes a second capacitor C2 ; the second capacitor C2 includes a first end connected to the reference output structure 211 and a second end connected to the controller 1 .

[0075] As an example, since the voltage across the second capacitor C2 cannot change suddenly, the reference signal output by the regulator U1 is received at the first end of the second capacitor C2, and the reference signal starts to charge the second capacitor C2. During the charging stage, a voltage pulse is induced at the second end of the second capacitor C2 to form a pre-charging completion signal.

[0076] Furthermore, the first isolation structure 212 may also include a third resistor R3, the third resistor R3 includes a first end connected to the second end of the second capacitor C2 and a second end connected to the first ground end, and the third resistor R3 divides the pre-charging completion signal to within the operating voltage range of the controller 1.

[0077] Reference Figure 4 In some embodiments, the isolation driving circuit 2 includes a pre-charge enable sub-circuit 22; the controller 1 is used to generate a pre-charge enable signal according to a power-on instruction and a pre-charge completion signal; the pre-charge enable sub-circuit 22 is electrically connected to the controller 1, and is used to control the on and off of the pre-charge circuit after unidirectionally isolating the pre-charge enable signal.

[0078] As an example, the power-on instruction is generated by an external circuit, and the controller 1 generates a precharge enable signal of the first state after receiving the power-on instruction, and generates a precharge enable signal of the second state after receiving the precharge completion signal. For example, the precharge enable signal of the first state may be a high level signal, and the precharge enable signal of the second state may be a low level signal.

[0079] As an example, the pre-charge enable subcircuit 22 includes a switch structure 222 and a second isolation structure 221; the second isolation structure 221 is connected to the controller 1 and the switch structure 222, and is used to generate a pre-charge control signal based on the pre-charge enable signal and unidirectionally isolate the pre-charge enable signal; the switch structure 222 is connected to the second isolation structure 221, and is used to control the on and off of the pre-charge loop based on the pre-charge control signal.

[0080] In the above embodiment, the pre-charge enable signal from the controller 1 is unidirectionally isolated by the second isolation structure 221, so that the second isolation structure 221 can control the on and off of the pre-charge circuit based on the pre-charge control signal after unidirectional isolation, thereby transmitting the pre-charge control signal to the switch structure 222 while avoiding the switch structure 222 from outputting a reverse voltage to the controller 1 and damaging the controller 1.

[0081] In some embodiments, the second isolation structure 221 includes a third capacitor C3 and a photocoupler U2; the photocoupler U2 includes an anode connected to the first end of the third capacitor C3 and the controller 1, a cathode connected to the third capacitor C3 and the second end and the first ground terminal, a collector connected to the switch structure 222, and an emitter connected to the second ground terminal.

[0082] In some embodiments, the switch structure 222 includes a second switch, a fourth resistor R4 and a fifth resistor R5, the second switch tube Q2 includes a control electrode connected to the first end of the fifth resistor R5 and the second isolation structure 221, a first electrode connected to the first end of the fourth resistor R4 and a second electrode connected to the pre-charge detection subcircuit 21; the fourth resistor R4 also includes a second end connected to the second end of the fifth resistor R5 and the second power supply.

[0083] As an example, when the controller 1 outputs a pre-charge enable signal of the first state, the pre-charge enable signal is filtered by the third capacitor C3 and output to the anode of the photocoupler U2, so that the light-emitting diode of the photocoupler U2 starts to emit light, and turns on the transistor in the light-emitting diode, so that the photocoupler U2 is turned on, so that the control electrode of the second switch tube Q2 is pulled down to the second ground terminal, and the output of the second power supply provides a bias voltage to the second switch tube Q2 after the voltage is divided by the fourth resistor R4 and the fifth resistor R5, so that the second switch tube Q2 is turned on, thereby realizing the conduction of the pre-charge circuit.

[0084] In some embodiments, the high-voltage side circuit includes a power main circuit, and the isolation drive circuit 2 also includes a drive subcircuit 23; the drive subcircuit 23 includes an isolation drive chip U3 and a first switch tube Q1; the isolation drive chip U3 includes a signal input terminal connected to the controller 1 and a signal output terminal connected to the first switch tube Q1; the isolation drive chip U3 is used to generate a drive signal of a first state according to a power supply start signal; wherein the power supply start signal is generated by the controller 1 based on the pre-charge completion signal. The first switch tube Q1 includes a control electrode connected to the signal output terminal of the isolation drive chip U3 to receive a drive signal, a first electrode connected to the second power supply, and a second electrode connected to the load.

[0085] In the above embodiment, when the electric vehicle starts to power on, the load is first pre-charged through the pre-charging circuit. The controller 1 recognizes that the pre-charging process is completed through the pre-charging completion signal output by the pre-charging detection sub-circuit 21 to generate a power supply start signal, and transmits the power supply start signal to the signal input end of the isolation driver chip U3, so that the isolation driver chip U3 generates a drive signal in the first state. The first switch tube Q1 receives the drive signal from the isolation driver chip U3 and turns on, thereby completing the conduction of the main power circuit. Since the isolation driver chip U3 has an isolation function, it can directly receive the drive signal from the controller 1 and avoid the output of the main power circuit from flowing back to the controller 1.

[0086] In some embodiments, the isolation drive circuit 2 further includes a monitoring subcircuit 24; the monitoring subcircuit 24 includes an isolation monitoring chip U4; the isolation monitoring chip U4 includes a sampling end connected to the main power circuit, a first output end connected to the controller 1, and a second output end connected to the signal input end of the isolation drive chip U3. The isolation monitoring chip U4 is used to collect the current signal of the main power circuit to generate a power-off control signal. The isolation drive chip U3 is used to generate a drive signal of the second state according to the power-off control signal to control the main power circuit to disconnect.

[0087] As an example, a power-off control signal can be generated based on the current signal by the isolation monitoring chip U4. Alternatively, the controller 1 can be connected to the isolation driving chip U3 and the isolation monitoring chip U4 to receive the current signal, obtain the power-off control signal according to the current signal, and send the power-off control signal to the isolation driving chip U3. The power-off control signal can be generated by one of the isolation monitoring chip U4 and the controller 1, or they can be generated separately to jointly control the isolation driving chip U3.

[0088] As an example, the driving signal of the first state may be a high-level signal, and the driving signal of the second state may be a low-level signal. The power-off control signal may be a low-level signal. When the current signal of the main power circuit collected by the isolation monitoring chip U4 exceeds the current threshold preset by its internal current sampling module, the current sampling module of the isolation monitoring chip U4 will ground its second output terminal internally to form a power-off control signal. After the controller 1 receives the current signal, the controller 1 may output a low level through the I / O1 pin of the controller 1 to form a power-off control signal through software analysis, for example, when the current signal exceeds the preset current threshold.

[0089] Reference Figure 5 According to the second aspect of the present application, a power isolation control method is provided, which is executed by the above-mentioned controller 1 and is used to control the above-mentioned power isolation control system. The method includes steps S101 to S103, which are described in detail below.

[0090] Step S101: receiving a power-on instruction, generating a pre-charge enable signal of a first state based on the power-on instruction, and outputting the pre-charge enable signal of the first state to the pre-charge enable sub-circuit 22 to control the conduction of the pre-charge loop.

[0091] Step S102: receiving a pre-charge completion signal from the pre-charge detection sub-circuit 21, and generating a power supply start signal based on the pre-charge completion signal to control the conduction of the power main circuit.

[0092] Step S103: generating a pre-charge enable signal of a second state based on the power supply start signal, and outputting the pre-charge enable signal of the second state to the pre-charge enable sub-circuit 22 to control the pre-charge loop to be disconnected.

[0093] It should be noted that the pre-charge enable signal of the second state is generated according to the power supply control signal, rather than the pre-charge completion signal. That is, after the power supply control signal controls the main power circuit to open, the pre-charge enable signal of the second state is generated to control the pre-charge circuit to close. This is because if the pre-charge circuit is disconnected first, the capacitive component of the load will start to discharge, which may easily lead to poor pre-charge effect. Therefore, it is necessary to ensure that the main power circuit is opened first and then the pre-charge circuit is closed.

[0094] Reference Figure 6 In some embodiments, the power isolation control method includes steps S201 to S202, which are described in detail below.

[0095] Step S201: outputting the power supply start signal to the driving sub-circuit 23 to control the power supply main circuit to be turned on;

[0096] Step S202: receiving a current signal from the monitoring subcircuit 24, analyzing the current signal to obtain the power-off control signal, and outputting the power-off control signal to the driving subcircuit 23 to control the disconnection of the main power supply circuit.

[0097] According to a third aspect of the present application, a controller is provided for executing the above-mentioned power isolation control method.

[0098] According to a fourth aspect of the present application, a vehicle is also provided, comprising the above-mentioned power isolation control system or controller.

[0099] According to a fifth aspect of the present application, a storage medium is provided, comprising a computer program that can be loaded by a processor and executed in the above-mentioned power isolation control method.

[0100] It should be noted that in the description of this application, the terms "high voltage" and "low voltage" are a set of relative descriptions, rather than specific, absolute voltage values. That is, the two terms "high voltage" and "low voltage" are used to describe the comparative relationship between the voltage values ​​of two systems, components or states, rather than referring to the specific voltage values ​​corresponding to each of them.

[0101] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0102] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0103] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0104] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A power isolation control system, characterized in that: include: A controller connected to the first power source and the first ground terminal; The isolation drive circuit is electrically connected to the high-voltage side loop and is used to electrically isolate the high-voltage side loop and then communicate with the controller; wherein the high-voltage side loop is connected to a second power supply and a second ground terminal.

2. The power isolation control system according to claim 1, characterized in that: The high-voltage side circuit includes a pre-charge circuit, and the isolation drive circuit includes a pre-charge detection sub-circuit; The pre-charge detection sub-circuit is electrically connected to the pre-charge loop, and is used to collect the pre-charge voltage signal of the pre-charge loop, and electrically isolate the pre-charge voltage signal to generate a pre-charge completion signal; The controller is used to cut off the pre-filling circuit according to the pre-filling completion signal.

3. The power isolation control system according to claim 2, characterized in that: The pre-charge detection subcircuit includes a reference output structure and a first isolation structure; The reference output structure is electrically connected to the pre-charge circuit, and is used to collect the pre-charge voltage signal of the pre-charge circuit, and generate a reference signal based on the pre-charge voltage signal; The first isolation structure is connected to the reference output structure and the controller, and is used to isolate the reference signal to obtain the pre-charge completion signal.

4. The power isolation control system according to claim 3, characterized in that: The reference output structure includes a first resistor, a second resistor and a voltage regulator; The voltage regulator includes a reference terminal and an input terminal connected to the first resistor and the second resistor, and an output terminal connected to the first isolation structure; The first resistor includes a first end connected to the pre-charge loop and a second end connected to the first end of the second resistor, the reference end and the input end of the regulator; The second resistor also includes a second terminal connected to a second ground terminal.

5. The power isolation control system according to claim 4, characterized in that: The reference output structure also includes a first capacitor; The first capacitor includes a first end connected to the second end of the second resistor and the input end of the regulator, and a second end connected to the second ground end.

6. The power isolation control system according to claim 3, characterized in that: The first isolation structure includes a second capacitor; The second capacitor includes a first end connected to the reference output structure and a second end connected to the controller.

7. The power isolation control system according to claim 2, characterized in that: The isolation driving circuit includes a pre-charge enabling sub-circuit; The controller is also used to generate a pre-charge enable signal according to the power-on instruction and the pre-charge completion signal; The pre-charge enabling sub-circuit is electrically connected to the controller, and is used to control the on-off of the pre-charge loop after unidirectionally isolating the pre-charge enabling signal.

8. The power isolation control system according to claim 7, characterized in that: The precharge enabling subcircuit includes a switch structure and a second isolation structure; The second isolation structure is connected to the controller and the switch structure, and is used to generate a pre-charge control signal according to the pre-charge enable signal and to unidirectionally isolate the pre-charge enable signal; The switch structure is connected to the second isolation structure and is used to control the on and off of the pre-charging loop according to the pre-charging control signal.

9. The power isolation control system according to claim 8, characterized in that: The second isolation structure includes a third capacitor and a photocoupler; The photocoupler includes an anode connected to a first end of a third capacitor and the controller, a cathode connected to a second end of the third capacitor and the first ground, a collector connected to the switch structure, and an emitter connected to the second ground.

10. The power isolation control system according to claim 2, characterized in that: The high-voltage side circuit includes a power supply main circuit, and the isolation drive circuit also includes a drive subcircuit; The driving sub-circuit comprises an isolation driving chip and a first switch tube; The isolation driving chip includes a signal input terminal connected to the controller and a signal output terminal connected to the first switch tube; the isolation driving chip is used to generate a driving signal of a first state according to a power supply start signal; wherein the power supply start signal is generated by the controller based on the pre-charge completion signal; The first switch tube includes a control electrode connected to the signal output terminal of the isolation driving chip to receive the driving signal, a first electrode connected to the second power supply, and a second electrode connected to the load.

11. The power isolation control system according to claim 10, characterized in that: The isolation driving circuit also includes a monitoring subcircuit; The monitoring subcircuit includes an isolation monitoring chip; the isolation monitoring chip includes a sampling end connected to the power main circuit, a first output end connected to the controller, and a second output end connected to the signal input end of the isolation driving chip; the isolation monitoring chip is used to collect the current signal of the power main circuit to generate a power-off control signal; The isolation driving chip is used to generate a driving signal in a second state according to the power-off control signal to control the disconnection of the main power circuit.

12. The power isolation control system according to claim 11, characterized in that: The isolation monitoring chip is further used to generate the power-off control signal according to the current signal, and send the power-off control signal to the isolation driving chip; and / or The controller is also connected to the isolation driver chip and the isolation monitoring chip, and is used to receive the current signal, obtain the power-off control signal according to the current signal, and send the power-off control signal to the isolation driver chip.

13. A power isolation control method, characterized in that: Used to control the power isolation control system according to any one of claims 1 to 12, the isolation drive circuit includes a pre-charge detection sub-circuit and a pre-charge enabling sub-circuit, and the method includes: receiving a power-on instruction, generating a pre-charge enable signal of a first state based on the power-on instruction, and outputting the pre-charge enable signal of the first state to the pre-charge enable sub-circuit to control the conduction of the pre-charge loop; receiving a pre-charge completion signal from the pre-charge detection sub-circuit, and generating a power supply start signal based on the pre-charge completion signal to control the conduction of the power main circuit; A pre-charge enable signal of a second state is generated based on the power supply start signal, and the pre-charge enable signal of the second state is output to the pre-charge enable sub-circuit to control the pre-charge loop to be disconnected.

14. The power isolation control method according to claim 13, characterized in that: The isolation driving circuit further includes a monitoring subcircuit and a driving subcircuit, and the method further includes: Outputting the power supply start signal to the driving sub-circuit to control the conduction of the main power supply circuit; A current signal is received from the monitoring subcircuit, the current signal is analyzed to obtain a power-off control signal, and the power-off control signal is output to the driving subcircuit to control the main power circuit to be disconnected.

15. A controller, characterized in that: Used to execute the power isolation control method described in any one of claims 13 to 14.

16. A vehicle, characterized in that: It comprises the power isolation control system according to any one of claims 1 to 12 or the controller according to claim 15.

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