Isolation activation circuit

Abstract

The present application discloses an isolation activation circuit. The circuit includes a voltage-dividing isolation module, which is used to divide the power supply voltage to generate a first voltage and a second voltage, and isolate the power supply voltage from the first voltage; a pulse activation module, which is used to generate a first pulse signal according to the first voltage and the second voltage; a first power conversion module, which is used to convert the power supply voltage into a first power-on voltage according to the first pulse signal or the second pulse signal; a second power conversion module, which is used to convert the first power-on voltage into a second power-on voltage according to a first control signal, or to terminate the conversion of the first power-on voltage into the second power-on voltage according to a second control signal; a power-on self-holding module, which is used to generate a second pulse signal according to the second power-on voltage and the second voltage; and a detection module, which is used to enable the battery management system to output a second control signal. The isolation activation circuit provided in the present application draws power directly from the power supply module, realizing a battery management system that uses high-voltage direct current isolation to drive low voltage.

Description

Technical Field

[0001] The present application relates to the field of circuit technology, and in particular to an isolation activation circuit. Background Art

[0002] A common problem faced by electric or hybrid vehicles using advanced battery management systems (BMS) is power management during vehicle startup. Because these vehicles may not be equipped with a traditional 12V or 24V low-voltage auxiliary power system, a method is required to activate the BMS during the startup phase, thereby starting the entire vehicle's power system. A common approach is to use a separate small battery or a button to activate the BMS-powered DC-DC converter (DC-DC) module, which provides initial power to the vehicle's control system and other necessary startup circuits.

[0003] However, since activating the wake-up circuit relies on a small battery, not only does this increase the cost of the vehicle system, but due to the limited capacity of small batteries, their service life is typically short, requiring regular maintenance and replacement. This significantly inconveniences vehicle maintenance and increases operating costs. In some cases, failure to replace the battery promptly can lead to problems such as starting failures, impacting vehicle reliability and normal use. Summary of the Invention

[0004] In view of the above problems, the present application provides an isolation activation circuit to solve the above technical problems.

[0005] The present application provides an isolation activation circuit for controlling the power-on of a battery management system, including a voltage divider isolation module, a pulse activation module, a first power conversion module, a second power conversion module, a power-on self-holding module, a detection module and a power-on switch.

[0006] A voltage dividing isolation module is used to connect to the power module, divide the power voltage output by the power module to generate a first voltage and a second voltage, and isolate the power voltage from the first voltage;

[0007] a pulse activation module, configured to generate a first pulse signal according to the first voltage and the second voltage after the power-on switch is turned on;

[0008] a first power conversion module, configured to be connected to the power module, convert the power voltage into a first power-on voltage according to the first pulse signal, and convert the power voltage into the first power-on voltage according to the second pulse signal, so as to power on the battery management system according to the first power-on voltage;

[0009] a second power conversion module, configured to convert the first power-on voltage into the second power-on voltage according to a first control signal generated after the battery management system is powered on, or to terminate the conversion of the first power-on voltage into the second power-on voltage according to a second control signal output by the battery management system;

[0010] A power-on self-holding module, configured to receive a second power-on voltage and a second voltage, and generate a second pulse signal according to the second power-on voltage and the second voltage;

[0011] The detection module is configured to receive the second power-on voltage and, after the power-on switch is turned off, output a power-on switch off signal to the battery management system according to the second power-on voltage, so that the battery management system outputs a second control signal.

[0012] The isolation activation circuit provided in the present application is used to control the power-on of the battery management system. Specifically, the isolation activation circuit directly draws power from the total voltage of the battery on the high-voltage side to power on the battery management system. When powered on, the power-on switch is turned on, and the voltage-dividing isolation module extracts the first voltage and the second voltage isolated from the power supply voltage from the power supply module. The pulse activation module generates a first pulse signal based on the first voltage and the second voltage to activate the first power conversion module to power on the battery management system. After the battery management system is powered on, the second power conversion module is activated to supply power to the power-on self-holding module and the detection module, and then the first power conversion module is activated by the second pulse signal generated by the power-on self-holding module to continue to supply power to the battery management system. When the power is turned off, the power-on switch is disconnected. The detection module detects the disconnected state of the power-on switch and causes the battery management system to output a second control signal to control the second power conversion module and the first unit conversion module to power off successively. Compared with the traditional activation circuit that uses an independent small battery to provide initial power for the battery management system, the isolated activation circuit provided in this application draws power directly from the power module, realizing the use of the high-voltage DC isolation of the power module to drive the low-voltage battery management system. There is no need to set up an additional independent small battery to provide initial power for the battery management system, which solves the problem of short life of independent small batteries and the need for regular maintenance and replacement, and reduces the cost increase caused by small batteries.

[0013] These and other aspects of the present application will become more readily apparent from the description of the following embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 A module schematic diagram of the isolation activation circuit provided in an embodiment of the present application is shown.

[0016] Figure 2 A schematic structural diagram of a voltage divider isolation module provided in an embodiment of the present application is shown.

[0017] Figure 3 Another structural schematic diagram of the voltage divider isolation module provided in an embodiment of the present application is shown.

[0018] Figure 4 A schematic diagram of a pulse activation module provided in an embodiment of the present application is shown.

[0019] Figure 5 Another schematic diagram of the pulse activation module provided in an embodiment of the present application is shown.

[0020] Figure 6 Another schematic diagram of the pulse activation module provided in an embodiment of the present application is shown.

[0021] Figure 7 A schematic structural diagram of the pulse activation module provided in an embodiment of the present application is shown.

[0022] Figure 8 A schematic diagram of a first power conversion module provided in an embodiment of the present application is shown.

[0023] Figure 9 A structural schematic diagram of a first power conversion module provided in an embodiment of the present application is shown.

[0024] Figure 10 A schematic diagram of a second power conversion module provided in an embodiment of the present application is shown.

[0025] Figure 11 A schematic structural diagram of a second power conversion module provided in an embodiment of the present application is shown.

[0026] Figure 12 A schematic diagram of a power-on self-holding module provided in an embodiment of the present application is shown.

[0027] Figure 13 A schematic structural diagram of a power-on self-holding module provided in an embodiment of the present application is shown.

[0028] Figure 14 A schematic diagram of a detection module provided in an embodiment of the present application is shown.

[0029] Figure 15 A schematic structural diagram of the detection module provided in an embodiment of the present application is shown.

[0030] Figure 16 A schematic structural diagram of an isolation activation circuit provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described 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, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0032] In the embodiments of the present application, it should be noted that, in this document, relational terms such as first and second, etc., are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0033] Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0034] In addition, in the embodiments of the present application, "plurality" refers to two or more. In view of this, in the embodiments of the present application, "plurality" can also be understood as "at least two". "At least one" can be understood as one or more, for example, one, two, or more. For example, "including at least one" means including one, two, or more, and does not limit which ones are included. For example, "including at least one of A, B, and C" means including A, B, C, A and B, A and C, B and C, or A, B, and C.

[0035] It should be noted that in the embodiments of the present application, "connection" can be understood as electrical connection, and the connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be either a direct connection between A and B or an indirect connection between A and B through one or more other electrical components.

[0036] In the embodiments of the present application, the first terminal of each transistor is one of the source / emitter and the drain / collector, and the second terminal of each transistor is the other of the source / emitter and the drain / collector. Because the source / emitter and drain / collector of a transistor can be structurally symmetrical, the source / emitter and drain / collector can be structurally identical. In other words, the first terminal and the second terminal of the transistor in the embodiments of the present application can be structurally identical.

[0037] In the circuit structure provided in the embodiments of the present application, the first node, the second node and other nodes do not represent actual components, but represent the junction points of related couplings in the circuit diagram. That is, these nodes are nodes formed by the equivalent junction points of related couplings in the circuit diagram.

[0038] An embodiment of the present application provides an isolated activation circuit for directly drawing power from a power module on the high-voltage side to power a battery management system (BMS), thereby solving the problems of increased circuit cost and poor reliability in traditional solutions that rely on providing an independent low-voltage battery / low-voltage power supply to power the battery management system.

[0039] Optionally, the isolated activation circuit provided in the embodiment of the present application is applied to an automotive system, and powers the battery management system by extracting electrical energy from the total battery voltage of the automotive system, so as to avoid the use of an independent small battery in the automotive system to activate the DCDC (direct current-to-direct current converter) module that powers the battery management system (BMS), thereby solving the problem that the independent small battery has limited capacity, short service life, and requires regular maintenance and replacement.

[0040] It is understandable that in the embodiments of the present application, although the battery management system (BMS) is a widely recognized term, in actual applications, different manufacturers may use different names to describe this functional module based on product characteristics and market positioning. Although their names may be different, their core functions and goals are similar, namely, to manage and monitor the status of the battery to ensure the safe and efficient operation of the battery. For example, the battery management system (BMS) may also be called a battery monitoring system (Battery Monitoring System), a battery protection system (Battery Protection System), a smart battery management system (Smart Battery Management System), a power management system (Power Management System), etc.

[0041] Figure 1 FIG. 1 shows a module schematic diagram of an isolation activation circuit provided in an embodiment of the present application, such as Figure 1 As shown, the isolation activation circuit provided in the embodiment of the present application includes a voltage divider isolation module, a pulse activation module, a first power conversion module, a second power conversion module, a power-on self-holding module, a detection module and a power-on switch.

[0042] The voltage dividing isolation module is used to connect to the power module, divide the power voltage output by the power module into a first voltage and a second voltage, and isolate the power voltage from the first voltage.

[0043] Among them, the pulse activation module is used to generate a first pulse signal based on the first voltage and the second voltage after the power-on switch is turned on. The first power conversion module is used to connect to the power module, convert the power supply voltage into the first power-on voltage according to the first pulse signal, and convert the power supply voltage into the first power-on voltage according to the second pulse signal, so as to power on the battery management system according to the first power-on voltage. The second power conversion module is used to receive the first power-on voltage and receive the first control signal generated after the battery management system is powered on, so as to convert the first power-on voltage into the second power-on voltage, or receive the second control signal output by the battery management system to terminate the conversion of the first power-on voltage into the second power-on voltage. The power-on self-holding module is used to receive the second power-on voltage and the second voltage, and generate a second pulse signal based on the second power-on voltage and the second voltage. The detection module is used to receive the second power-on voltage, and after the power-on switch is turned off, output a power-on switch disconnection signal to the battery management system based on the second power-on voltage, so that the battery management system outputs the second control signal.

[0044] It will be appreciated that in the embodiments of the present application, the power-on switch is used to respond to external commands to control the on / off state of the isolation activation circuit. Therefore, the embodiments of the present application do not impose any restrictions on the form of the power-on switch. For example, the power-on switch can be designed as a circuit with on / off functions, which is turned on or off by receiving external signals. For another example, the power-on switch can also be configured as a separate switching device, which is also turned on or off by receiving external signals.

[0045] In some embodiments, when the isolation activation circuit provided in the embodiments of the present application is used to control a battery management system of a car, the power-on switch can be set to be turned on when the car is started and turned off when the car is closed.

[0046] It will be understood that in the embodiments of the present application, the "power module" specifically refers to a high-voltage battery controlled by a battery management system (BMS). For example, for new energy vehicles, the power module refers to a high-voltage battery that provides electrical energy to the entire new energy vehicle; for another example, in the field of energy storage, the power module refers to a high-voltage battery in the energy storage system.

[0047] The isolation activation circuit provided in the embodiment of the present application is used to control the power-on of the battery management system. When powered on, the power-on switch is turned on, the voltage-dividing isolation module extracts the first voltage and the second voltage isolated from the power supply voltage from the power supply module, and the pulse activation module generates a first pulse signal based on the first voltage and the second voltage to activate the first power conversion module to power on the battery management system. After the battery management system is powered on, the second power conversion module is activated to supply power to the power-on self-holding module and the detection module, and then the first power conversion module is activated by the second pulse signal generated by the power-on self-holding module to continue to supply power to the battery management system. When powered off, the power-on switch is disconnected, and the detection module detects the disconnected state of the power-on switch and causes the battery management system to output a second control signal to control the second power conversion module and the first unit conversion module to power off successively. Compared with the traditional solution of using an independent low-voltage battery (or other low-voltage power supply) to provide initial power for the battery management system, the isolation activation circuit provided in the embodiment of the present application can directly draw power from the high-voltage power supply module, realizing the use of the high-voltage direct current isolation of the power supply module to drive the low-voltage battery management system. There is no need to set up an additional independent small battery to provide initial power for the battery management system, which improves the reliability of the isolation activation circuit, solves the problem of short life of independent small batteries and the need for regular maintenance and replacement, and reduces the cost increase caused by small batteries.

[0048] In some embodiments, Figure 2 FIG. 1 shows a schematic diagram of the structure of the voltage dividing isolation module provided in an embodiment of the present application. Figure 2 As shown, the voltage-dividing isolation module includes a first series resistor network 100 and a second series resistor network 200 .

[0049] The first series resistor network 100 is provided with a first node 110 and a second node 120. The first end of the first series resistor network 100 is used to connect to the positive electrode of the power module, and the second end is used to connect to the negative electrode of the power module. The first node 110 and the second node 120 are connected to the pulse activation module to output a first voltage to the pulse activation module. Figure 2 As shown, the first series resistor network 100 includes a plurality of resistor elements connected in series. The resistor element between the first end of the first series resistor network 100 and the first node 110 is used to isolate the positive electrode of the power module from the first node 110. Therefore, there is a low-voltage power supply positive electrode isolated from the power module at the first node 110. The resistor element between the first end of the first series resistor network 100 and the second node 120 is used to isolate the negative electrode of the power module from the second node 120. Therefore, there is a low-voltage power supply negative electrode isolated from the power module at the second node 120. The resistor element between the first node 110 and the second node 120 is a voltage divider circuit for obtaining the voltage of the low-voltage power supply, that is, the first voltage.

[0050] The first end of the second series resistor network 200 is used to connect to the positive electrode of the power module, and the second end is connected to the pulse activation module and the power-on self-holding module to output a second voltage to the pulse activation module and the power-on self-holding module. Figure 2 As shown, the second series resistance network also includes several resistance elements connected in series to divide the power supply voltage of the power supply module and output it to the pulse activation module and the power-on self-holding module, so that the pulse activation module and the power-on self-holding module can generate a first pulse signal and a second pulse signal.

[0051] It can be understood that in the embodiment of the present application, the number of resistor elements in the first series resistor network and the second series resistor network is determined according to various factors such as the required voltage divider and the impedance required to isolate the positive and negative poles of the power supply module, the voltage of the power supply module, and industry-related standards. The purpose of the embodiment of the present application is to propose a first series resistor network and a second series resistor network to extract the first voltage and the second voltage from the power supply module. There is no specific restriction on the specific number of resistor elements in the first series resistor network and the second series resistor network, and the number of resistor elements is determined by the requirements during circuit design.

[0052] The isolation activation circuit provided in the embodiment of the present application realizes the use of the high-voltage direct current isolation of the power module to drive the low-voltage battery management system by simply connecting multiple basic elements (resistance elements) in series in the power module on the high-voltage side, thereby significantly reducing the cost of controlling the power-on of the battery management system.

[0053] In some embodiments, Figure 3 Another structural diagram of the voltage dividing isolation module provided in the embodiment of the present application is shown in FIG. Figure 3 As shown, the voltage division isolation module further includes a first parallel capacitor network 300 and a transient voltage suppression diode TVS.

[0054] The first end of the first parallel capacitor network 300 is respectively connected to the cathode of the transient voltage suppressor diode TVS, the pulse activation module, and the power-on self-holding module. The second end of the first parallel capacitor network 300 is used to connect to the negative electrode of the power module, and the anode of the transient voltage suppressor diode TVS is used to connect to the negative electrode of the power module. Optionally, the first parallel capacitor network 300 includes a plurality of capacitor elements connected in parallel, which are used to be charged by the second voltage generated by the second series resistor network 200, and drive the pulse activation module and the power-on self-holding module to generate a first pulse signal and a second pulse signal respectively during discharge. The transient voltage suppressor diode TVS is used to stabilize the voltage across the first parallel capacitor network within the maximum clamping voltage of the transient voltage suppressor diode TVS to protect the pulse activation module and the power-on self-holding module.

[0055] Optionally, in the first parallel capacitor network 300, the positive electrode of each capacitor element is used to connect to the cathode of the transient voltage suppression diode TVS, the pulse activation module and the power-on self-holding module, and the negative electrode is used to connect to the negative electrode of the power supply module. It can be understood that in order to realize the charge and discharge control of the first parallel capacitor network, the pulse activation module and the power-on self-holding module are driven to generate the first pulse signal and the second pulse signal, the positive electrode of the capacitor component is connected to the pulse activation module and the power-on self-holding module, and the negative electrode is connected to the negative electrode of the power supply, which is a conventional connection method in the circuit field, so it will not be explained in the embodiment of the present application.

[0056] The isolation activation circuit provided in the embodiment of the present application further generates a first pulse signal and a second pulse signal by controlling the charge and discharge of the first parallel capacitor network to drive the pulse activation module and the power-on self-holding module, and stabilizes the voltage across the first parallel capacitor network within its maximum clamping voltage through the transient voltage suppression diode TVS, thereby improving the reliability of the isolation activation circuit.

[0057] In some embodiments, Figure 4 A schematic diagram of a pulse activation module provided in an embodiment of the present application is shown in FIG. Figure 4 As shown, the pulse activation module includes a first energy storage unit, a second energy storage unit, a first optical coupler unit, a first anti-reverse connection unit and a first current limiting unit.

[0058] The first energy storage unit is connected to the voltage divider isolation module to receive a first voltage and is connected to the anode input terminal of the first optocoupler unit (i.e., the anode of the primary side of the optocoupler) via a power-on switch and a first reverse polarity protection unit. The second energy storage unit is connected to the cathode input terminal of the first optocoupler unit (i.e., the cathode of the primary side of the optocoupler) via a first current limiting unit. The first output terminal of the first optocoupler unit (i.e., the collector of the secondary side of the optocoupler) is connected to the voltage divider isolation module to receive a second voltage, and the second output terminal (i.e., the emitter of the secondary side of the optocoupler) is connected to the first power conversion module. Optionally, the first energy storage unit is connected to the first node and the second node of the voltage divider isolation module, thereby receiving the first voltage to store electrical energy when the power-on switch is disconnected, and releasing the electrical energy after the power-on switch is turned on. The electrical energy released by the first energy storage switch forms a loop through the anode input terminal, the cathode input terminal and the second energy storage unit of the first optocoupler unit, so that the first output terminal and the second output terminal of the first optocoupler unit are turned on. The first output terminal of the first optocoupler unit is connected to the second series resistor network 200 of the voltage divider isolation module. When the first output terminal and the second output terminal of the first optocoupler unit are turned on, the second series resistor network 200 forms a loop with the first power conversion module through the first optocoupler, that is, when the first optocoupler unit has a signal transmitted at the anode input terminal and the cathode input terminal, its first output terminal and the second output terminal will generate a signal, which is the first pulse signal. The second energy storage unit stores the electric energy released by the first energy storage unit through the first optocoupler unit. When the voltage of the second energy storage unit is the same as the voltage of the first energy storage unit, the first energy storage unit no longer releases electric energy to the second energy storage unit. At this time, there is no signal transmission between the anode input terminal and the cathode input terminal of the first optocoupler unit, and the first pulse signal generated by its first output terminal and the second output terminal disappears.

[0059] The isolation activation circuit provided in the embodiment of the present application uses the first energy storage unit and the second energy storage unit to activate the first optocoupler unit, thereby generating a first pulse signal to activate the first power conversion module. When connected to the voltage divider isolation module, it can realize the use of the high-voltage direct current isolation of the power module to drive the low-voltage battery management system, thereby improving the power-on efficiency of the battery management system.

[0060] It can be understood that in the embodiment of the present application, the first anti-reverse connection unit and the first current limiting unit can be set as electronic components / circuit modules that include anti-reverse connection functions and current limiting functions.

[0061] In some embodiments, Figure 5 Another schematic diagram of the pulse activation module provided in the embodiment of the present application is shown in FIG. Figure 5 As shown, the first energy storage unit includes a first series capacitor network 400 to increase the capacitor withstand voltage by connecting multiple capacitor elements in series, thereby storing energy divided by the first node and the second node of the voltage dividing isolation module, a second current limiting unit and a second anti-reverse connection unit.

[0062] The first current limiting unit and the second reverse connection protection unit are connected in series and connected to one end of the first series capacitor network 400, for receiving the second power-on voltage to charge the first series capacitor network 400. The other end of the first series capacitor network 400 is grounded. Optionally, the positive electrode of the first series capacitor network 400 is connected to the first node of the voltage divider isolation module and is connected to the second power conversion module through the first current limiting unit and the second reverse connection protection unit, and the negative electrode is grounded. In this way, when the power-on switch is turned off, the first series circuit network 400 can still be charged through the second power conversion module, thereby solving the problem of slow charging speed of the first series circuit network 400 using only the voltage divider isolation module, thereby enabling the power-on switch to control the battery management system to continuously power on and off by continuously and quickly turning on and off.

[0063] The second energy storage unit includes a second parallel capacitor network 500 , which increases capacitance by connecting a plurality of capacitor elements in parallel, thereby receiving the electrical energy released by the first energy storage unit.

[0064] The first series capacitor network includes a plurality of capacitor elements connected in series, and the second parallel capacitor network includes a plurality of capacitor elements connected in parallel.

[0065] It is understandable that in order to realize the charge and discharge control of the first series capacitor network 400, the driving pulse activation module generates a first pulse signal, so that the negative pole of the capacitor component is grounded, and the positive pole is connected to each module, which belongs to the conventional connection means in the circuit field. Therefore, the embodiment of the present application does not describe the positive and negative pole connection relationship of the capacitor component. In addition, in the embodiment of the present application, the first voltage / second voltage, the first power-on voltage, and the second power-on voltage are three electrically isolated voltages. Here, the positive pole of the first series capacitor network 400 is directly connected to the power supply as the second power conversion module, so the negative pole of the first series capacitor network 400 should be connected to the ground wire of the second power conversion module. This connection method also belongs to the well-known scheme in the circuit field, so the implementation of the present application does not describe this.

[0066] It can be understood that in the embodiment of the present application, the second anti-reverse connection unit and the second current limiting unit can be respectively set as electronic components / circuit modules including the anti-reverse connection function and the current limiting function.

[0067] In some embodiments, Figure 6 Another schematic diagram of the pulse activation module provided in the embodiment of the present application is shown as follows: Figure 6 As shown, the pulse activation module further includes a first transistor Q1, a third anti-reverse connection unit, a fourth anti-reverse connection unit, a fifth anti-reverse connection unit, a sixth anti-reverse connection unit, a first voltage regulator diode D1, a first resistor R1, a second resistor R2 and a third resistor R3.

[0068] The first transistor Q1 is used to control the second energy storage unit to release electrical energy after the power-on switch is turned off. The control terminal of the first transistor is connected to the power-on switch through the third anti-reverse connection unit and the first anti-reverse connection unit, and is grounded through the first resistor R1. It is connected to the second terminal of the first transistor Q1 through the second resistor R2, and is connected to the first current limiting unit and the second energy storage unit through the fourth anti-reverse connection unit, the first voltage regulator diode D1, and the fifth anti-reverse connection unit. The first terminal of the first transistor Q1 is grounded through the third resistor R3, and the second terminal of the first transistor Q1 is also connected to the positive input terminal of the first optical coupler unit through the sixth anti-reverse connection unit. Optionally, when the power-on switch is turned off, the second energy storage unit begins to release electrical energy. At this time, the first transistor Q1 is turned on, so that the second energy storage unit quickly discharges electrical energy to the third resistor R3 through the first transistor Q1, ensuring that after the power-on switch is turned on again, the first energy storage unit can continue to discharge electrical energy to the second energy storage unit to generate the first pulse signal. The first resistor R1 and the second resistor R2 are used to provide a bias voltage for the first transistor Q1.

[0069] It can be understood that in the embodiment of the present application, the third anti-reverse connection unit, the fourth anti-reverse connection unit, the fifth anti-reverse connection unit, and the sixth anti-reverse connection unit can be configured to include electronic components / circuit modules with an anti-reverse connection function.

[0070] In some embodiments, in the isolation activation circuit provided by the embodiments of the present application, the first transistor Q1 includes a P-channel MOSFET.

[0071] In some embodiments, Figure 7 The structure diagram of the pulse activation module provided in the embodiment of the present application is shown as follows: Figure 7 As shown, the first anti-reverse connection unit includes a diode D3 and a diode D4 connected in series, the second anti-reverse connection unit includes a diode D5, the third anti-reverse connection unit includes a diode D6, the fourth anti-reverse connection unit includes a diode D7, the fifth anti-reverse connection unit includes a diode D8, the sixth anti-reverse connection unit includes a diode D9, the first current limiting unit includes a resistor R15 and a resistor R16 connected in parallel, and the second current limiting unit includes a resistor R17.

[0072] It can be understood that the signal transmission relationship and working principle of the pulse activation module have been explained in the embodiments of the present application. That is to say, the embodiments of the present application have explained the current direction of each anti-reverse polarity unit when it is powered on. On this basis, when the anti-reverse polarity unit is a diode, setting the anode and cathode connection method of the diode is a well-known technical means in the circuit field. Therefore, the embodiments of the present application do not provide additional explanation of the anode and cathode connection method of each diode.

[0073] It can be understood that in the embodiments of the present application, the number of diodes in each anti-reverse polarity unit is determined according to the design requirements of the circuit. For example, because an anti-reverse polarity unit needs to be set between the first anti-reverse polarity unit and the control end and the second end of the first transistor, the first anti-reverse polarity unit can be set as two diodes during circuit design.

[0074] It is understandable that if Figure 7 As shown, the first optocoupler unit includes a first optocoupler U1 and a diode D12. Diode D12 is used for reverse and freewheeling protection to prevent breakdown of the first optocoupler U1 when a negative voltage appears on the primary side of the first optocoupler U1. This means that diode D12 is not a necessary electronic component of the first optocoupler unit. The first current-limiting unit includes a resistor R15 and a resistor R16 connected in parallel. Resistor R16 is connected to diode D12. When the first optocoupler unit only includes the first optocoupler U1, the first current-limiting unit can also be configured to include only resistor R15.

[0075] In some embodiments, Figure 8 FIG. 1 shows a schematic diagram of a first power conversion module provided in an embodiment of the present application, as shown in FIG. Figure 8 As shown, the first power conversion module includes a second transistor Q2, a third transistor Q3, a fourth transistor Q4, a second voltage regulator D2, a seventh anti-reverse connection unit, a first filtering unit, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8 and a first power conversion unit DCDC1.

[0076] The control end of the second transistor Q2 is connected to the negative electrode of the power supply module through the second voltage regulator diode D2, and is connected to the pulse activation module through the fourth resistor R4. The first end is connected to the pulse activation module through the fifth resistor R5, and the second end is connected to the third transistor Q3 and the fourth transistor Q4 respectively through the seventh anti-reverse connection unit.

[0077] The control end of the third transistor Q3 is connected to the negative electrode of the power module through the sixth resistor R6, the first end is connected to the negative electrode of the power module through the seventh resistor R7, and the second end is connected to the fourth transistor Q4;

[0078] The control end of the fourth transistor Q4 is connected to the negative electrode of the power module through the eighth resistor R8 and is connected to the negative electrode of the power module through the first filtering unit. The first end is connected to the first power conversion unit DCDC1, and the second end is connected to the negative electrode of the power module.

[0079] The first power conversion unit DCDC1 is used to step down the power supply voltage to convert it into a first power-on voltage. The positive input terminal Vin+ of the first power conversion unit DCDC1 is connected to the positive electrode of the power module, the negative input terminal Vin- is connected to the fourth transistor Q4, the positive output terminal Vout+ and the negative output terminal Vout- are connected to the second power conversion module, and the positive output terminal Vout+ is also connected to the battery management system to power the battery management system.

[0080] Optionally, in the first power conversion module provided in an embodiment of the present application, after the power-on switch is turned on, the second transistor Q2, the fourth resistor R4, the fifth resistor R5 and the second voltage regulator diode D2 form a linear voltage regulator circuit. After receiving the first pulse signal and / or the second pulse signal, the linear voltage regulator circuit controls the fourth transistor Q4 to turn on, so that the negative input terminal of the first power conversion unit DCDC1 forms a loop with the negative electrode of the power module, thereby causing the first power conversion unit DCDC1 to start working to step down the power supply voltage to the first power-on voltage, and then power the battery management system through the first power-on voltage. After the power-on switch is disconnected, the first pulse signal and the second pulse signal fail, and the third transistor Q3 is turned on, thereby accelerating the discharge rate of the fourth transistor Q4 to achieve rapid cutoff of the fourth transistor Q4. Among them, the sixth resistor R6 is used to provide a bias voltage for the third transistor Q3, and the seventh resistor R7 and the eighth resistor R8 are used for current limiting.

[0081] In some embodiments, in the isolation activation circuit provided by the embodiments of the present application, the second transistor Q2 includes an NPN transistor.

[0082] In some embodiments, in the isolation activation circuit provided by the embodiments of the present application, the third transistor Q3 includes a PNP transistor.

[0083] In some embodiments, in the isolation activation circuit provided by the embodiments of the present application, the fourth transistor Q4 includes an IGBT (Insulated Gate Bipolar Transistor).

[0084] In some embodiments, the first power conversion unit DCDC1 is configured as a DC-DC converter (direct current-to-direct current converter).

[0085] It can be understood that in the embodiment of the present application, the first power conversion unit can be set to any electronic component or circuit module that can achieve voltage conversion.

[0086] In some embodiments, Figure 9 FIG. 1 shows a schematic structural diagram of a first power conversion module provided in an embodiment of the present application. Figure 9 As shown, the seventh anti-reverse connection unit includes a diode D10, and the first filtering unit includes a capacitor C1.

[0087] In some embodiments, Figure 10 FIG. 1 shows a schematic diagram of a second power conversion module provided in an embodiment of the present application, as shown in FIG. Figure 10 As shown, the second power conversion module includes a fifth transistor Q5, a sixth transistor Q6, a second filtering unit, a third filtering unit, a fourth filtering unit, a fifth filtering unit, a first bidirectional transient voltage suppression diode TVS1, a second bidirectional transient voltage suppression diode TVS2, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12 and a second power conversion unit DCDC2.

[0088] The control end of the fifth transistor Q5 is connected to the first power conversion module (i.e., the positive output terminal Vout+ of the first power conversion unit DCDC1) through the ninth resistor R9, and is connected to the sixth transistor Q6 through the tenth resistor R10. The first end is connected to the first power conversion module (i.e., the positive output terminal Vout+ of the first power conversion unit DCDC1), the second end is connected to the positive input terminal Vin+ of the second power conversion unit DCDC2, and is connected to the sixth transistor Q6 through the second filtering unit.

[0089] The control end of the sixth transistor Q6 is connected to the battery management system to receive the first control signal or the second control signal through the eleventh resistor R11, and is connected to the first power conversion module (the negative output terminal Vout- of the first power conversion unit DCDC1) through the twelfth resistor R12 and the third filtering unit respectively. The first end is connected to the fifth transistor Q5 through the tenth resistor R10, and the second end is connected to the first power conversion module (the negative output terminal Vout+ of the first power conversion unit DCDC1) and the negative input terminal Vin- of the second power conversion unit DCDC2 respectively, and is connected to the fifth transistor Q5 and the positive input terminal Vin+ of the second power conversion unit DCDC2 through the second filtering unit, and is connected to the positive input terminal Vin+ of the second power conversion unit DCDC2 through the fourth filtering unit.

[0090] Two ends of the first bidirectional transient voltage suppression diode TVS1 are respectively connected to the first power conversion module (ie, the positive output terminal Vout+ of the first power conversion unit DCDC1) and the positive input terminal Vin+ of the second power conversion unit.

[0091] The first end of the second bidirectional transient voltage suppression diode TVS2 is connected to the first power conversion module (ie, the positive output terminal Vout+ of the first power conversion unit DCDC1), and the second end is connected to the negative input terminal Vin- of the second power conversion unit DCDC2.

[0092] The second power conversion unit DCDC2 is used to convert the first power-on voltage into a second power-on voltage. The positive output terminal Vout+ of the second power conversion unit is respectively connected to the power-on self-holding module, the detection module and the fifth filtering unit. The negative output terminal Vout- of the second power conversion unit DCDC2 is connected to the fifth filtering unit and grounded.

[0093] Optionally, in the second power conversion module provided in an embodiment of the present application, when the power-on switch is turned on, after the first power conversion module supplies power to the battery management system, the battery management system outputs a first control signal to the control terminal of the sixth transistor Q6 via the tenth resistor R10, thereby turning on the sixth transistor Q6 and the fifth transistor Q5 in sequence, thereby causing the second power conversion unit DCDC2 to operate, converting the first power-on voltage into a second power-on voltage, and supplying power to the power-on self-holding module and the detection module via the second power-on voltage. After the power-on switch is turned off, the battery management system outputs a second control signal to the control terminal of the sixth transistor Q6 via the tenth resistor R10, thereby turning off the sixth transistor Q6 and the fifth transistor Q5, thereby stopping the operation of the second power conversion unit DCDC2. Among them, the ninth resistor R9 and the tenth resistor R10 are used to provide a bias voltage for the conduction of the fifth transistor Q5, the eleventh resistor R11 and the twelfth resistor R12 are used to provide a bias voltage for the conduction of the sixth transistor Q6, and the first bidirectional transient voltage suppression diode TVS1 and the second bidirectional transient voltage suppression diode TVS2 are used to protect the circuit between the first power conversion unit DCDC1 and the second power conversion unit DCDC2 from being broken down by overvoltage.

[0094] In some embodiments, the first control signal is at a high level, and the second control signal is at a low level.

[0095] In some embodiments, the second power conversion unit DCDC2 also provides a second power-on voltage to the first energy storage unit of the pulse activation module, so that the first energy storage unit can still be charged through the second power conversion unit DCDC2 after the power-on switch is disconnected, thereby solving the problem of slow charging speed of the first energy storage unit only through the voltage divider isolation module, so that the power-on switch can control the battery management system to continuously power on and off by continuously and quickly turning on and off.

[0096] In some embodiments, in the isolation activation circuit provided by the embodiments of the present application, the fifth transistor Q5 includes an N-channel MOSFET.

[0097] In some embodiments, in the isolation activation circuit provided by the embodiments of the present application, the sixth transistor Q6 includes a P-channel MOSFET.

[0098] In some embodiments, the second power conversion unit DCDC2 is configured as a DC-DC converter (DC-DC converter).

[0099] It can be understood that in the embodiment of the present application, the second power conversion unit can be set to any electronic component or circuit module that can achieve voltage conversion.

[0100] It is understandable that the signal transmission relationship and working principle of the second power conversion module have been described in the embodiment of the present application. Based on this working principle, the connection method of the positive output terminal and the negative output terminal of the first power conversion unit DCDC1 of the second power conversion module must be the same as Figure 10 The connections shown are the same.

[0101] In some embodiments, Figure 11 FIG. 1 shows a schematic diagram of the structure of the second power conversion module provided in an embodiment of the present application. Figure 11 As shown, the second filtering unit includes capacitor C2, the third filtering unit includes capacitor C3, the fourth filtering unit includes capacitor C4, and the fifth filtering unit includes a third parallel capacitor network 600, which includes several capacitor elements connected in parallel.

[0102] In some embodiments, Figure 12 A schematic diagram of a power-on self-holding module provided in an embodiment of the present application is shown in FIG. Figure 12 As shown, the power-on self-holding module includes a second optical coupler unit, an eighth anti-reverse connection unit and a third current limiting unit.

[0103] The anode input terminal of the primary side of the second optocoupler U2 is connected to the second power conversion module through the eighth anti-reverse connection unit to receive the second power-on voltage, and the cathode input terminal is grounded through the third current limiting unit. The first output terminal of the secondary side of the second optocoupler U2 is connected to the voltage divider isolation module, and the second output terminal is connected to the first power conversion module. Optionally, when the power-on switch is turned on, the primary side of the second optocoupler U2 receives the second power-on voltage to turn on its secondary side, thereby causing the second voltage to generate a second pulse signal through the secondary side for transmission to the first power conversion module. After the power-on switch is turned off, the second power-on voltage disappears, the secondary side of the second optocoupler U2 is cut off, and the second pulse signal is invalid.

[0104] It is understandable that if Figure 12 As shown, the second optocoupler unit includes a second optocoupler U2 and a diode D13. Here, the diode D13 is used for anti-reverse and freewheeling to protect the second optocoupler U2 from breakdown when a negative voltage appears on the primary side of the second optocoupler U2. That is, the diode D13 is not a necessary electronic component constituting the second optocoupler unit.

[0105] In some embodiments, Figure 13 The schematic diagram of the structure of the power-on self-holding module provided in the embodiment of the present application is shown in FIG. Figure 13As shown, the eighth reverse connection prevention unit includes a diode D10, and the third current limiting unit includes a resistor R18.

[0106] In some embodiments, Figure 14 A schematic diagram of the detection module provided in the embodiment of the present application is shown in FIG. Figure 14 As shown, the detection module includes a seventh transistor Q7, a third optical coupler unit U3, a fourth current limiting unit, a fifth current limiting unit, a thirteenth resistor R13, and a fourteenth resistor R14.

[0107] The control end of the seventh transistor Q7 is connected to the power-on switch through the thirteenth resistor R13 to detect the on / off state of the power-on switch, and is grounded through the fourteenth resistor R14. The first end is connected to the third optical coupler unit U3, and the second end is used for grounding.

[0108] The anode input terminal of the third optocoupler unit U3 is connected to the second power conversion module through the fourth current limiting unit, the cathode input terminal is connected to the seventh transistor Q7, and the first output terminal and the second output terminal are connected to the battery management system to output a power-on switch disconnection signal to the battery management system when the power-on switch is disconnected; wherein, the first output terminal of the third optocoupler unit is connected to the battery management system through the fifth current limiting unit.

[0109] Optionally, the control terminal of the seventh transistor Q7 is connected to a node between the power-on switch and the first anti-reverse connection unit of the voltage divider isolation module. When the power-on switch is turned on, the voltage level at the node is high, the first transistor Q7 is turned on, and the third optical coupler unit U3 is turned on. At this time, the battery management unit detects that the power-on switch is in the on state. After the power-on switch is turned off, the voltage level at the node is low (the low-level signal is the power-on switch off signal), the seventh transistor Q7 is turned off, and the third optical coupler unit U3 is turned off. At this time, the battery management unit detects that the power-on switch is in the off state, thereby outputting a second control signal to the second battery management module.

[0110] It is understandable that in the embodiment of the present application, there is no restriction on the connection method between the detection module and the power-on switch, as long as the power-on switch can output a low level (i.e., a power-on switch disconnection signal) to the detection module after being disconnected.

[0111] In some embodiments, the seventh transistor Q7 includes an N-channel MOSFET.

[0112] In some embodiments, Figure 15 The schematic diagram of the structure of the detection module provided in the embodiment of the present application is shown in FIG. Figure 15 As shown, the fourth current limiting unit includes a resistor R19, and the fifth current limiting unit includes a resistor R20.

[0113] Figure 16The structural diagram of the isolation activation circuit provided by the embodiment of the present application is shown. Figure 16 Take the working principle of the isolation activation circuit as an example to explain. Figure 16 In FIG. 1 , A1 , A2 , and A3 represent nodes on a connection line, which are used to indicate that two different modules are connected. For example, the power-on switch and the resistor R23 are both connected to A2 to indicate that the power-on switch and the resistor R23 are connected.

[0114] like Figure 16 As shown, the voltage of the power module (power + and power -) is isolated and divided by the first series resistor network 100 to generate a first voltage to charge the second parallel capacitor network 500. After the power-on switch is turned on, the first series capacitor network 400 charges the second parallel capacitor network 500 through the primary side of the first optical coupler U1, so that the secondary side of the first optical coupler U1 is turned on. The voltage of the power module (power + and power -) is divided by the second series resistor network 200 to generate a second voltage to the first optical coupler U1 to generate a first pulse signal. The first pulse signal successively turns on the second transistor Q2 and the fourth transistor Q4, so that the negative electrode of the first power conversion unit DCDC1 and the negative electrode (power -) of the power module form a loop, and the first power conversion unit DCDC1 starts to output the first power-on voltage to power the battery management system BMS.

[0115] After being powered on, the battery management system BMS outputs a first control signal (ie, a high-level signal) to turn on the sixth transistor Q6 and the fifth transistor Q5 , thereby causing the second power conversion unit DCDC12 to start outputting a second power-on voltage.

[0116] After the second power conversion unit DCDC12 outputs the second power-on voltage, it drives the second optical coupler U2 to be turned on, so that the second optical coupler receives the second voltage to generate a second pulse signal, and the second pulse signal controls the second transistor Q2 and the fourth transistor Q4 to be turned on.

[0117] After the power-on switch is turned on, when the voltage across the first series resistor network 100 is the same as the voltage across the second parallel capacitor network 500, the first series resistor network 100 stops discharging, and the first optocoupler U1 is turned off. At this time, the second pulse signal controls the second transistor Q2 and the fourth transistor Q4 to turn on.

[0118] After the power-on switch is disconnected, the level at A2 is converted from a high level to a low level, so that the seventh transistor Q7 is turned off, and the third optocoupler U3 is also turned off. At this time, the signal output by the third optocoupler U3 to the battery management system BMS changes from a high level to a low level (the low level signal is the power-on switch disconnection signal), and the battery management system BMS starts to output a second control signal (i.e., a low level signal) to turn off the sixth transistor Q6 and the fifth transistor Q5, so that the second power conversion unit DCDC12 stops outputting the second power-on voltage, and the second optocoupler U2 is therefore disconnected. At this time, the first pulse signal and the second pulse signal are both invalid, and the battery management system implements the power-off operation.

[0119] After the power-on switch is turned off, the level of the control end of the first transistor Q1 becomes a low level, the first transistor Q1 is turned on, and the electric energy stored in the second parallel capacitor network 500 is quickly discharged to the third resistor R3 through the diode D8 and the first transistor Q1, so as to prevent the voltage across the second parallel capacitor network 500 from quickly becoming the same as the first series capacitor network 400 when the power-on switch is turned on again.

[0120] After the power-on switch is disconnected, the first series capacitor network 400 is charged only through the first series resistor network 100 at a relatively slow speed. In order to ensure that the battery management system can be successfully activated by quickly reclosing the power-on switch after it is disconnected, the second power management unit DCDC2 will quickly charge C1 and C2 through the resistor R17 and the diode D5 after each activation of the battery management system to meet the requirement of continuous and rapid power on and off of the power-on switch.

[0121] The isolation activation circuit provided in the embodiment of the present application is used to control the power-on of the battery management system. Only basic components such as basic resistors, capacitors, optocouplers, transistors, etc. can be used to form the isolation activation circuit to directly draw power from the high-voltage power supply module, thereby realizing the use of the high-voltage direct current isolation of the power supply module to drive the low-voltage battery management system. Compared with traditional solutions, the embodiment of the present application does not require the provision of additional independent small batteries to provide initial power for the battery management system, thereby improving the reliability of the isolation activation circuit, solving the problem of short life of independent small batteries and the need for regular maintenance and replacement, and reducing the cost increase caused by small batteries.

[0122] The above content is a further detailed description of the present application in conjunction with specific implementation methods, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, several simple deductions or substitutions can be made without departing from the concept of the present application, which should be considered as the scope of protection of the present application.

Claims

1. An isolation activation circuit, characterized in that: Used to control the power-on of the battery management system, including a voltage division isolation module, a pulse activation module, a first power conversion module, a second power conversion module, a power-on self-holding module, a detection module and a power-on switch; The voltage dividing isolation module is used to connect to the power supply module, divide the power supply voltage output by the power supply module to generate a first voltage and a second voltage, and isolate the power supply voltage from the first voltage; The pulse activation module is configured to generate a first pulse signal according to the first voltage and the second voltage after the power-on switch is turned on; The first power conversion module is configured to be connected to the power module, convert the power supply voltage into a first power-on voltage according to the first pulse signal, and convert the power supply voltage into the first power-on voltage according to the second pulse signal, so as to power on the battery management system according to the first power-on voltage; the second power conversion module being configured to convert the first power-on voltage into a second power-on voltage according to a first control signal generated after the battery management system is powered on, or to terminate the conversion of the first power-on voltage into the second power-on voltage according to a second control signal output by the battery management system; The power-on self-holding module is configured to receive the second power-on voltage and the second voltage, and generate the second pulse signal according to the second power-on voltage and the second voltage; the detection module is configured to receive the second power-on voltage, and after the power-on switch is turned off, output a power-on switch off signal to the battery management system according to the second power-on voltage, so that the battery management system outputs the second control signal; Among them, when the battery management system is powered on, the first power conversion module converts the power supply voltage into the first power-on voltage according to the first pulse signal to power on the battery management system, the second power conversion module converts the first power-on voltage into the second power-on voltage according to the first control signal generated after the battery management system is powered on, the power-on self-holding module receives the second power-on voltage and the second voltage, generates the second pulse signal according to the second power-on voltage and the second voltage, and the first power conversion module converts the power supply voltage into the first power-on voltage according to the second pulse signal to power the battery management system.

2. The isolation activation circuit according to claim 1, wherein: The voltage dividing isolation module includes a first series resistor network and a second series resistor network; The first series resistor network is provided with a first node and a second node, the first end of the first series resistor network is used to connect to the positive electrode of the power module, and the second end is used to connect to the negative electrode of the power module, and the first node and the second node are connected to the pulse activation module to output the first voltage to the pulse activation module; The first end of the second series resistor network is used to connect to the positive electrode of the power module, and the second end is connected to the pulse activation module and the power-on self-holding module to output the second voltage to the pulse activation module and the power-on self-holding module; The first series resistor network includes several resistor elements connected in series, the second series resistor network includes several resistor elements connected in series, and at least one of the resistor elements is included between the first end of the first series resistor network and the first node, at least one of the resistor elements is included between the second end of the first series resistor network and the second node, and at least one of the resistor elements is included between the first node and the second node.

3. The isolation activation circuit according to claim 2, wherein: The voltage dividing isolation module further includes a first parallel capacitor network and a transient voltage suppression diode; The first end of the first parallel capacitor network is connected to the cathode of the transient voltage suppression diode, the pulse activation module and the power-on self-holding module respectively, the second end of the first parallel capacitor network is used to connect to the negative electrode of the power module, and the anode of the transient voltage suppression diode is used to connect to the negative electrode of the power module; The first parallel capacitor network includes a plurality of capacitor elements connected in parallel.

4. The isolation activation circuit according to claim 1, wherein: The pulse activation module includes a first energy storage unit, a second energy storage unit, a first optical coupler unit, a first anti-reverse connection unit and a first current limiting unit; The first energy storage unit is connected to the voltage dividing isolation module and is connected to the anode input terminal of the first optical coupler unit through the power-on switch and the first anti-reverse connection unit, and is configured to receive the first voltage to store electrical energy when the power-on switch is off, and release the electrical energy when the power-on switch is on; The second energy storage unit is connected to the cathode input terminal of the first optical coupler unit through the first current limiting unit, and is used to store the electric energy released by the first energy storage unit through the first optical coupler unit; The first output end of the first optical coupler unit is connected to the voltage divider isolation module to receive the second voltage, and the second output end is connected to the first power conversion module to generate the first pulse signal during the period when the first energy storage unit releases electrical energy.

5. The isolation activation circuit according to claim 4, wherein: The first energy storage unit includes a first series capacitor network, a second current limiting unit and a second reverse connection protection unit; The first current limiting unit and the second reverse connection prevention unit are connected in series and connected to one end of the first series capacitor network, and are used to receive the second power-on voltage to charge the first series capacitor network, and the other end of the first series capacitor network is used for grounding; The second energy storage unit includes a second parallel capacitor network, one end of the second parallel capacitor network is connected to the first optical coupler unit through the first current limiting unit, and the other end is grounded; The first series capacitor network includes a plurality of capacitor elements connected in series, and the second parallel capacitor network includes a plurality of capacitor elements connected in parallel.

6. The isolation activation circuit according to claim 4, wherein: The pulse activation module further includes a first transistor, a third anti-reverse connection unit, a fourth anti-reverse connection unit, a fifth anti-reverse connection unit, a sixth anti-reverse connection unit, a first voltage stabilizing diode, a first resistor, a second resistor, and a third resistor; The first transistor is used to control the second energy storage unit to release electric energy after the power-on switch is disconnected; the control end of the first transistor is connected to the power-on switch through the third anti-reverse connection unit and the first anti-reverse connection unit, and is grounded through the first resistor, and is connected to the second end of the first transistor through the second resistor, and is connected to the first current limiting unit and the second energy storage unit through the fourth anti-reverse connection unit, the first voltage regulator diode and the fifth anti-reverse connection unit. The first end of the first transistor is grounded through the third resistor, and the second end of the first transistor is also connected to the positive input end of the first optical coupler unit through the sixth anti-reverse connection unit.

7. The isolation activation circuit according to claim 1, wherein: The first power conversion module includes: a second transistor, a third transistor, a fourth transistor, a second voltage stabilizing diode, a seventh anti-reverse connection unit, a first filtering unit, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor and a first power conversion unit; The second transistor is used to receive the first pulse signal and the second pulse signal to control the conduction of the fourth transistor, the control end of the second transistor is connected to the negative electrode of the power supply module through the second voltage regulator diode, and is connected to the pulse activation module through the fourth resistor, the first end is connected to the pulse activation module through the fifth resistor, and the second end is connected to the third transistor and the fourth transistor respectively through the seventh anti-reverse connection unit; The third transistor is used to control the fourth transistor to be turned off after the first pulse signal or the second pulse signal fails, the control end of the third transistor is connected to the negative electrode of the power module through the sixth resistor, the first end is connected to the negative electrode of the power module through the seventh resistor, and the second end is connected to the fourth transistor; The control end of the fourth transistor is connected to the negative electrode of the power module through the eighth resistor and is connected to the negative electrode of the power module through the first filtering unit, the first end is connected to the first power conversion unit, and the second end is connected to the negative electrode of the power module; The first power conversion unit is used to step down the power supply voltage to convert it into the first power-on voltage. The positive input terminal of the first power conversion unit is connected to the positive pole of the power module, the negative input terminal is connected to the fourth transistor, the positive output terminal and the negative output terminal are connected to the second power conversion module, and the positive output terminal is also connected to the battery management system to power the battery management system.

8. The isolation activation circuit according to claim 1, wherein: The second power conversion module includes: a fifth transistor, a sixth transistor, a second filtering unit, a third filtering unit, a fourth filtering unit, a fifth filtering unit, a first bidirectional transient voltage suppression diode, a second bidirectional transient voltage suppression diode, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, and a second power conversion unit; The fifth transistor is configured to receive the first power-on voltage to supply power to the second power conversion unit, wherein the control terminal of the fifth transistor is connected to the first power conversion module through the ninth resistor and is connected to the sixth transistor through the tenth resistor, the first terminal of the fifth transistor is connected to the first power conversion module, the second terminal of the fifth transistor is connected to the positive input terminal of the second power conversion unit, and is connected to the sixth transistor through the second filtering unit; The control terminal of the sixth transistor receives the first control signal or the second control signal through the eleventh resistor, and is connected to the first power conversion module through the twelfth resistor and the third filtering unit respectively, the first terminal is connected to the fifth transistor through the tenth resistor, the second terminal is connected to the negative input terminals of the first power conversion module and the second power conversion unit respectively, and is connected to the fifth transistor and the positive input terminal of the second power conversion unit through the second filtering unit, and is connected to the positive input terminal of the second power conversion unit through the fourth filtering unit; Two ends of the first bidirectional transient voltage suppression diode are respectively connected to the positive input terminals of the first power conversion module and the second power conversion unit; A first end of the second bidirectional transient voltage suppression diode is connected to the first power conversion module, and a second end is connected to the negative input terminal of the second power conversion unit; The second power conversion unit is used to convert the first power-on voltage into the second power-on voltage, the positive output end of the second power conversion unit is respectively connected to the power-on self-holding module, the detection module and the fifth filtering unit, and the negative output end of the second power conversion unit is connected to the fifth filtering unit and grounded.

9. The isolation activation circuit according to claim 1, wherein: The power-on self-holding module includes a second optical coupler unit, an eighth anti-reverse connection unit and a third current limiting unit; The second optocoupler unit is used to receive the second voltage and the second power-on voltage to generate the second pulse signal, the anode input terminal is connected to the second power conversion module through the eighth anti-reverse connection unit to receive the second power-on voltage, the cathode input terminal is grounded through the third current limiting unit, the first output terminal is connected to the voltage divider isolation module, and the second output terminal is connected to the first power conversion module.

10. The isolation activation circuit according to claim 1, wherein: The detection module includes a seventh transistor, a third optical coupler unit, a fourth current limiting unit, a fifth current limiting unit, a thirteenth resistor, and a fourteenth resistor; The control end of the seventh transistor is connected to the power-on switch through the thirteenth resistor to detect the on / off state of the power-on switch, and is grounded through the fourteenth resistor, a first end is connected to the third optical coupler unit, and a second end is used for grounding; The anode input terminal of the third optical coupler unit is connected to the second power conversion module through the fourth current limiting unit, the cathode input terminal is connected to the seventh transistor, and the first output terminal and the second output terminal are connected to the battery management system to output a power-on switch off signal to the battery management system when the power-on switch is turned off; Wherein, the first output end of the third optical coupler unit is connected to the battery management system through the fifth current limiting unit.

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