Time-controlled programmable pre-charging circuit, power supply system and power supply control method

Abstract

The invention relates to a time-controlled programmable pre-charging circuit, a power supply system and a power supply control method, and belongs to the technical field of power supply, the time-controlled programmable pre-charging circuit comprises at least two pre-charging branches, the pre-charging branches are electrically connected with pre-charging nodes respectively and are used for suppressing surge current; the switch driving circuit is electrically connected with the pre-charging branch circuit and is used for driving the pre-charging branch circuit to perform pre-charging; the voltage and current monitoring circuit is electrically connected with each pre-charging node and is used for monitoring real-time voltage and current values of each pre-charging node and feeding back the real-time voltage and current values to the MCU control system; the MCU control system is electrically connected with the switch driving circuit and the voltage and current monitoring circuit and used for controlling the switch driving circuit to drive the charging time sequence and time of each pre-charging branch according to the monitoring data of the voltage and current monitoring circuit, the pre-charging time sequence and the pre-charging time can be controlled, and the multi-stage power supply system is suitable for multi-stage complex power supply scenes.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply, and particularly to a time-controlled programmable pre-charge circuit, a power supply system, and a power supply control method. Background Art

[0002] In some fields of power electronics technology and motion control, due to the existence of devices such as lithium batteries, switching power supplies, and motor drives, inrush currents often occur instantaneously when power is applied. To avoid large instantaneous inrush currents during the entire power-on process and prevent damage to other devices in the entire circuit, a pre-charge circuit is often added at relevant nodes to suppress the generation of inrush currents, thereby enabling the entire power supply system to operate stably.

[0003] For general application scenarios, it is often only necessary to add resistors or capacitors to form a simple pre-charge circuit. For example, the pre-charge circuit, power supply circuit, and electronic device disclosed in Chinese Patent Application No. CN118487484A adopt a simple RC structure and are applicable to a single scenario, but it is difficult to meet the requirements for coordinated control of pre-charge timing in a multi-stage power supply scenario. For example, if the pre-charge sequence of each node in a multi-stage circuit is improper, it may cause the subsequent circuit to conduct prematurely, resulting in the superposition of inrush currents. In addition, existing solutions usually fully charge the capacitor, but in some scenarios, full pre-charging will extend the system startup time, and resistive loads may cause secondary inrush currents after the capacitor voltage decays.

[0004] Therefore, there is an urgent need for a pre-charge circuit that supports programmable timing and controllable pre-charge time. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a time-controlled programmable pre-charge circuit, a power supply system, and a power supply control method to achieve the suppression of inrush currents and the precise control of pre-charge timing and time in complex power supply scenarios.

[0006] To achieve the above object / to solve the above technical problems, the present invention is implemented by the following technical solutions: In a first aspect, the present invention provides a time-controlled programmable pre-charge circuit, including: At least two pre-charge branches, each of which is electrically connected to a pre-charge node and is used to suppress inrush currents; A switch driving circuit, which is electrically connected to the pre-charge branches and is used to drive the pre-charge branches to perform pre-charging; A voltage and current monitoring circuit, which is electrically connected to each pre-charge node and is used to monitor the real-time voltage and current values of each pre-charge node and feedback them to the MCU control system; An MCU control system, which is electrically connected to the switch driving circuit and the voltage and current monitoring circuit and is used to control the charging timing and time of each pre-charge branch of the switch driving circuit according to the monitoring data of the voltage and current monitoring circuit.

[0007] In combination with the first aspect, optionally, it further includes: A display system, electrically connected to the MCU control system, for displaying and regulating the current pre-charge circuit number and pre-charge parameters; A communication system, electrically connected to the MCU control system, for information feedback interaction with an external control system or device.

[0008] In combination with the first aspect, optionally, the pre-charge branch includes a resistor and a relay connected in series.

[0009] In a second aspect, the present invention provides a power supply system, including the time-controlled programmable pre-charge circuit described in any one of the first aspects.

[0010] In combination with the second aspect, optionally, the power supply system includes: A battery module, electrically connected to the switching power supply, for supplying power to the system; At least one switching power supply, electrically connected to the charging module, for supplying power to the charging module; A charging module, electrically connected to an external high-voltage system, for converting the external high voltage into a low voltage and outputting it to the main power supply link, and simultaneously charging the battery module; A drive module, electrically connected to the main power supply link, for driving the power module; A time-controlled programmable pre-charge circuit, electrically connected to the battery module, the switching power supply, the charging module, and the drive module respectively, for controlling the pre-charge timing and time of each module and suppressing the inrush current generated by each module.

[0011] In a third aspect, the present invention provides a power supply control method, using the time-controlled programmable pre-charge circuit described in any one of the first aspects, and the method includes: Connect each pre-charge branch in the time-controlled programmable pre-charge circuit to each pre-charge node; Obtain the real-time voltage and current values of each pre-charge node through a voltage and current monitoring circuit; Set the full-charge voltage value of the pre-charge load capacitor of each pre-charge node, and set the pre-charge target voltage of each pre-charge node; Calculate the required pre-charge time for each pre-charge node according to the set full-charge voltage value of the pre-charge load capacitor and the pre-charge target voltage of the pre-charge node; The MCU control system determines the pre-charge timing of each pre-charge node according to the power-on relationship of each pre-charge node and / or the real-time voltage and current values of each pre-charge node; The MCU control system controls the switch drive circuit to drive the corresponding pre-charge branch according to the pre-charge timing and pre-charge time.

[0012] In combination with the third aspect, optionally, the expression for calculating the pre-charge time required for each pre-charge node based on the fully charged voltage value of the set pre-charge load capacitor and the pre-charge target voltage of the pre-charge node is as follows: ; where T is the pre-charge time, R is the resistance value of the pre-charge resistor, C is the value of the pre-charge load capacitor, V1 is the fully charged voltage value of the pre-charge load capacitor, V0 is the initial voltage value of the pre-charge load capacitor, and Vt is the pre-charge target voltage value of the pre-charge node.

[0013] In combination with the third aspect, optionally, the MCU control system determines the pre-charge timing of each pre-charge node based on the power-on relationship of each pre-charge node and / or the real-time voltage and current values of each pre-charge node, including: When the MCU control system determines the pre-charge timing of each pre-charge node according to the power-on relationship of each pre-charge node, the method is: Determine the pre-charge order according to the power-on order of each pre-charge node from first to last; When the MCU control system determines the pre-charge timing of each pre-charge node according to the real-time voltage and current values of each pre-charge node, the method is: Determine the magnitude of the inrush current of each pre-charge node according to the real-time voltage and current values of each pre-charge node, and determine the pre-charge order according to the order of the inrush current of each pre-charge node from largest to smallest; When the MCU control system determines the pre-charge timing of each pre-charge node according to the power-on relationship of each pre-charge node and the real-time voltage and current values of each pre-charge node, the method is: Determine the pre-charge nodes that must be powered on in sequence among all pre-charge nodes, and determine the pre-charge order according to the power-on order of each pre-charge node from first to last; For the remaining pre-charge nodes, determine the pre-charge order according to the order of their inrush current from largest to smallest.

[0014] In combination with the third aspect, optionally, the power supply control method further includes: after the pre-charge of the pre-charge branch is completed, a discharge resistor is connected at the pre-charge node.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention: Multiple pre - charge branches are used to pre - charge multiple pre - charge nodes respectively. The voltage - current monitoring circuit monitors the real - time voltage and current values of each pre - charge node. The MCU control system controls the charging timing and time of each pre - charge branch through the monitoring data of the voltage - current monitoring circuit, which is applicable to complex power - supply scenarios. For the control of charging timing, the flexible adjustment of the pre - charge sequence of each pre - charge node can be realized, saving labor costs. For the control of charging time, the existing pre - charge circuits usually charge until full. On the one hand, in a multi - level complex power - supply scenario, if each pre - charge node is fully pre - charged, the time required for the entire system to operate completely is longer. In this application, the pre - charge time of the pre - charge nodes is controlled, and it can be selectively chosen to fully charge or not fully charge the pre - charge nodes. For the pre - charge nodes that are not fully charged, although there is still a small amount of surge current, it will not cause damage to the devices and will not affect the normal operation of the subsequent or the entire link. However, by operating without fully pre - charging, the pre - charge time is reduced, and in a multi - level complex process scenario, the overall operation time of the system can be effectively reduced. On the other hand, if there is a resistive load in the system devices, it will cause the input - end capacitance to decay and discharge electrical energy immediately after being fully charged in a short time, thus generating a surge current when the relay is re - closed. In this application, by controlling the pre - charge time of the pre - charge nodes, the problem of decay and discharge of electrical energy caused by fully pre - charging the pre - charge nodes is avoided, thereby avoiding the generation of surge current when the relay is re - closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the current - voltage monitoring diagram in Embodiment 1 of the present invention; Figure 2 is the module diagram of the time - controlled programmable pre - charge circuit of the present invention; Figure 3 is the module diagram of the power - supply system of the present invention; Figure 4 is the embodiment diagram of the power - supply system of the present invention; Figure 5 is the parameter - setting interface diagram in the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The technical solution of the present invention will be described in detail below through the drawings and specific embodiments. It should be understood that the specific features in the embodiments of the present application and the embodiments are detailed descriptions of the technical solution of the present application, rather than limitations on the technical solution of the present application. Without conflict, the technical features in the embodiments of the present application and the embodiments can be combined with each other.

[0018] In the description of the present invention, the description referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0019] The term "and / or" in this article is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0020] Embodiment 1:

[0021] As Figure 2 shown, Embodiment 1 of the present invention provides a time-controlled programmable pre-charge circuit, including: At least two pre-charge branches, the pre-charge branches are respectively electrically connected to the pre-charge nodes and are used to suppress inrush current. In some specific examples, the pre-charge branch includes a resistor and a relay connected in series. In some embodiments, the pre-charge branch can be connected to the pre-charge node through an external interface, and the external interface mainly includes external wiring terminals.

[0022] A switch drive circuit, electrically connected to the pre-charge branch, is used to drive the pre-charge branch to perform pre-charging; the switch drive circuit is a prior art and will not be elaborated here.

[0023] A voltage and current monitoring circuit, electrically connected to each pre-charge node, is used to monitor the real-time voltage and current values of each pre-charge node and feedback them to the MCU control system; the voltage and current monitoring circuit is a prior art and will not be elaborated here.

[0024] An MCU control system, electrically connected to the switch drive circuit and the voltage and current monitoring circuit, is used to control the charging timing and time of each pre-charge branch by the switch drive circuit according to the monitoring data of the voltage and current monitoring circuit; the MCU control system mainly includes a power supply circuit, a reset circuit, an MCU chip, and a crystal oscillator startup circuit. The peripheral circuits such as its power supply circuit, reset circuit, MCU chip, and crystal oscillator startup circuit are all prior arts and will not be elaborated here.

[0025] A display system, electrically connected to the MCU control system, is used to display and regulate the current pre-charge path number and pre-charge parameters; as Figure 5As shown in the parameter setting interface diagram, the pre-charge parameters displayed by the display system include but are not limited to the pre-charge resistance value, pre-charge load capacitance value, pre-charge initial voltage, pre-charge full voltage, pre-charge target voltage, pre-charge time, and pre-charge response priority; among them, the pre-charge resistance value is the resistance value in the pre-charge circuit, the pre-charge load capacitance value is the load capacitance value of the pre-charge node, and the pre-charge full voltage is the full voltage value of the pre-charge load capacitance, that is, the system voltage value, all of which are known conditions.

[0026] A communication system, electrically connected to the MCU control system, is used for information feedback interaction with an external control system or device; in some embodiments, the communication system is used for information feedback interaction with other external control boards, PCs, or other devices.

[0027] Embodiment 2:

[0028] Embodiment 2 of the present invention provides a power supply system, including the time-controlled programmable pre-charge circuit described in any one of Embodiment 1.

[0029] In some embodiments, as Figure 3 shown, the power supply system includes: A battery module, electrically connected to the switching power supply, is used to supply power to the system; At least one switching power supply, electrically connected to the charging module, is used to supply power to the charging module; A charging module, electrically connected to an external high-voltage system, is used to convert the external high voltage into a low voltage and output it to the main power supply link, and at the same time charge the battery module; A drive module, electrically connected to the main power supply link, is used to drive the power module; A time-controlled programmable pre-charge circuit, electrically connected to the battery module, switching power supply, charging module, and drive module respectively, is used to control the pre-charge timing and time of each module and suppress the inrush current generated by each module.

[0030] In a specific embodiment, as Figure 4 shown, the lithium battery is powered by 48V and is electrically connected to the switching power supply. The switching power supply converts 48V to 12V to supply power to the high-voltage to low-voltage module. The high-voltage to low-voltage module is electrically connected to the external high-voltage system, converts the external 1000V high voltage into 48V and outputs it to the main power supply link and at the same time charges the lithium battery. The motor driver, function control circuit board, light strip controller, and time-controlled programmable circuit are all powered by 48V through the main link.

[0031] The time-controlled programmable pre-charge circuit includes five pre-charge branches J1-J5, and the five pre-charge branches are respectively electrically connected to five pre-charge nodes, that is, relays K1-K5. Specifically: The output end of the lithium battery is provided with a system main switch S0, the input end of the switching power supply is provided with a relay K1, the input end of the light strip controller is provided with a relay K2, the input end of the function control circuit board is provided with a relay K3, the input end of the motor driver is provided with a relay K4, and the output end of the high-voltage to low-voltage power module is provided with a relay K5; the J1-1 end of the pre-charge branch is connected to the a point of the relay K1, the J1-2 end of the pre-charge branch is connected to the b point of the relay K1, the J1-3 end of the pre-charge branch is connected to one end of the relay K1 coil, and the other end of the relay K1 coil is connected to the 48V+ of the switching power supply; the J2-1 end of the pre-charge branch is connected to the a point of the relay K2, the J2-2 end of the pre-charge branch is connected to the b point of the relay K2, the J2-3 end of the pre-charge branch is connected to one end of the relay K2 coil, and the other end of the relay K2 coil is connected to the b end of the system main switch S0; the J3-1 end of the pre-charge branch is connected to the a point of the relay K3, the J3-2 end of the pre-charge branch is connected to the b point of the relay K3, the J3-3 end of the pre-charge branch is connected to one end of the relay K3 coil, and the other end of the relay K3 coil is connected to the b end of the system main switch S0; the J4-1 end of the pre-charge branch is connected to the a point of the relay K4, the J4-2 end of the pre-charge branch is connected to the b point of the relay K4, the J4-3 end of the pre-charge branch is connected to one end of the relay K4 coil, and the other end of the relay K4 coil is connected to the b end of the system main switch S0; the J5-1 end of the pre-charge branch is connected to the a point of the relay K5, the J5-2 end of the pre-charge branch is connected to the b point of the relay K5, the J5-3 end of the pre-charge branch is connected to one end of the relay K5 coil, and the other end of the relay K5 coil is connected to the PV+ of the high-voltage to low-voltage power module.

[0032] First, control the J2 pre-charge branch. After pre-charging for a period of time, the relay K2 is pulled in and the pre-charge circuit J2 is disconnected. At this time, the light strip controller prompts that the system power supply is normal and can enter the working state; then control the J1 pre-charge branch. After pre-charging for a period of time, the relay K1 is pulled in and the pre-charge branch J1 is disconnected; then control the J3 pre-charge branch. After pre-charging for a period of time, the relay K3 is pulled in and the pre-charge branch J3 is disconnected; then control the J5 pre-charge branch. After pre-charging for a period of time, the relay K5 is pulled in and the pre-charge branch J5 is disconnected; finally, control the J4 pre-charge branch. After pre-charging for a period of time, the relay K4 is pulled in and the pre-charge branch J4 is disconnected.

[0033] The pre-charge time of each pre-charge branch can be adjusted from microseconds to seconds. In this embodiment, the pre-charge time of the pre-charge branch J2 is set to 5S, the pre-charge time of the pre-charge branch J1 is set to 5S, the pre-charge time of the pre-charge branch J3 is set to 1S, the pre-charge time of the pre-charge branch J5 is set to 3S, and the pre-charge time of the pre-charge branch J4 is set to 0.85S; this embodiment is controlled according to the above-mentioned logical timing and pre-charge time, and no instantaneous surge current appears in the main power supply link.

[0034] Embodiment Three:

[0035] Embodiment 3 of the present invention provides a power supply control method, which uses the time-controlled programmable pre-charge circuit in any one of Embodiment 1. The method includes: Step 1: Electrically connect each pre-charge branch in the time-controlled programmable pre-charge circuit to each pre-charge node; Step 2: Obtain the real-time voltage and current values of each pre-charge node through the voltage and current monitoring circuit; Step 3: Set the full-charge voltage value of the pre-charge load capacitor of each pre-charge node, and set the pre-charge target voltage of each pre-charge node; Step 4: Calculate the pre-charge time required for each pre-charge node according to the set full-charge voltage value of the pre-charge load capacitor and the pre-charge target voltage of the pre-charge node. The expression is: ; where T is the pre-charge time, R is the resistance value of the pre-charge resistor, C is the value of the pre-charge load capacitor, V1 is the full-charge voltage value of the pre-charge load capacitor, that is, the system voltage value, V0 is the initial voltage value of the pre-charge load capacitor, and Vt is the pre-charge target voltage value of the pre-charge node; Step 5: The MCU control system determines the pre-charge timing of each pre-charge node according to the power-on relationship of each pre-charge node and / or the real-time voltage and current values of each pre-charge node, including: When the MCU control system determines the pre-charge timing of each pre-charge node according to the power-on relationship of each pre-charge node, the method is: Determine the pre-charge order according to the power-on order of each pre-charge node from first to last; When the MCU control system determines the pre-charge timing of each pre-charge node according to the real-time voltage and current values of each pre-charge node, the method is: Determine the magnitude of the inrush current of each pre-charge node according to the real-time voltage and current values of each pre-charge node, and determine the pre-charge order according to the order of the inrush current of each pre-charge node from large to small; When the MCU control system determines the pre-charge timing of each pre-charge node according to the power-on relationship of each pre-charge node and the real-time voltage and current values of each pre-charge node, the method is: Determine the pre-charge nodes that must be powered on in sequence among all pre-charge nodes, and determine the pre-charge order according to the power-on order of each pre-charge node from first to last; Determine the pre-charge order of the remaining pre-charge nodes according to the order of their inrush current from large to small.

[0036] Step 6: The MCU control system controls the switch drive circuit to drive the corresponding pre-charge branch according to the pre-charge timing and the pre-charge time.

[0037] In some embodiments, the power supply control method further includes: after the pre-charge of the pre-charge branch is completed, a discharge resistor is connected at the pre-charge node.

[0038] Existing pre-charge circuits are mostly used to solve the surge current problem generated by input / output capacitors. In complex power supply application scenarios, there are not only surge current problems caused by input / output capacitors, but also problems where the input terminal capacitor decays and discharges electrical energy after being quickly filled due to the resistive load within the device, resulting in a surge current when the relay is re-closed. For example, Figure 1 as shown in the current-voltage curve graph, where the horizontal coordinate is time and the vertical coordinate is the voltage value. Here, mainly look at the voltage curve graph. The existing pre-charge circuit starts pre-charging from time point C1 and stops pre-charging when it is fully charged at time point C3. The voltage increases from the initial 0V to approaching the system voltage value after being fully charged. However, in actual situations, at time point C2, the voltage has been pre-charged to be close to the system voltage. At this time, the input terminal capacitor decays and discharges electrical energy, resulting in a surge current when the relay is re-closed. In this embodiment, by directly setting the pre-charge target voltage value of the pre-charge node, the pre-charge time is indirectly controlled, so that the pre-charge stops directly at time point C2, avoiding the decay and discharge of electrical energy of the input terminal capacitor and shortening the pre-charge time.

[0039] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. A time-controlled programmable precharge circuit, characterized in that, Comprising: At least two pre-charge branches, each of the pre-charge branches being electrically connected to a pre-charge node for suppressing inrush current; A switch drive circuit, electrically connected to the pre-charge branches, for driving the pre-charge branches to perform pre-charging; A voltage and current monitoring circuit, electrically connected to each pre-charge node, for monitoring the real-time voltage and current values of each pre-charge node and feeding them back to the MCU control system; An MCU control system, electrically connected to the switch drive circuit and the voltage and current monitoring circuit, for controlling the charging timing and time of each pre-charge branch by the switch drive circuit according to the monitoring data of the voltage and current monitoring circuit.

2. The time-controlled programmable pre-charge circuit according to claim 1, characterized in that, Further comprising: A display system, electrically connected to the MCU control system, for displaying and regulating the current number of pre-charge paths and pre-charge parameters; A communication system, electrically connected to the MCU control system, for performing information feedback interaction with an external control system or device.

3. The time-controlled programmable pre-charge circuit according to claim 1, characterized in that, The pre-charge branch includes a resistor and a relay connected in series.

4. A power supply system, characterized in that, Comprising the time-controlled programmable pre-charge circuit according to any one of claims 1-3.

5. A power supply system according to claim 4, characterized in that, The power supply system includes: A battery module, electrically connected to a switch power supply, for supplying power to the system; At least one switch power supply, electrically connected to a charging module, for supplying power to the charging module; A charging module, electrically connected to an external high-voltage system, for converting the external high voltage into a low voltage and outputting it to the main power supply link, and simultaneously charging the battery module; A drive module, electrically connected to the main power supply link, for driving a power module; A time-controlled programmable pre-charge circuit, electrically connected to the battery module, the switch power supply, the charging module, and the drive module respectively, for controlling the pre-charge timing and time of each module and suppressing inrush current generated by each module.

6. A power supply control method, which uses the time-controlled programmable pre-charge circuit as described in any one of claims 1-3, characterized in that, The method includes: Electrically connecting each pre-charge branch in the time-controlled programmable pre-charge circuit to each pre-charge node; Obtaining the real-time voltage and current values of each pre-charge node through the voltage and current monitoring circuit; Setting the full-charge voltage value of the pre-charge load capacitor of each pre-charge node, and setting the pre-charge target voltage of each pre-charge node; Calculating the required pre-charge time of each pre-charge node according to the set full-charge voltage value of the pre-charge load capacitor and the pre-charge target voltage of the pre-charge node; The MCU control system determines the pre-charge timing of each pre-charge node according to the power-on relationship of each pre-charge node and / or the real-time voltage and current values of each pre-charge node; The MCU control system controls the switch drive circuit to drive the corresponding pre-charge branch according to the pre-charge timing and pre-charge time.

7. The power supply control method according to claim 6, characterized in that The expression for calculating the required pre-charge time of each pre-charge node according to the set full-charge voltage value of the pre-charge load capacitor and the pre-charge target voltage of the pre-charge node is: ； Wherein, T is the pre-charge time, R is the resistance value of the pre-charge resistor, C is the value of the pre-charge load capacitor, V1 is the full-charge voltage value of the pre-charge load capacitor, V0 is the initial voltage value of the pre-charge load capacitor, and Vt is the pre-charge target voltage value of the pre-charge node.

8. The power supply control method according to claim 6, wherein The MCU control system determines the pre-charge timing of each pre-charge node according to the power-on relationship of each pre-charge node and / or the real-time voltage and current values of each pre-charge node, including: When the method for the MCU control system to determine the pre-charge timing of each pre-charge node according to the power-on relationship of each pre-charge node is: Determining the pre-charge sequence according to the power-on sequence of each pre-charge node from first to last; When the MCU control system determines the pre-charging timing sequence of each pre-charging node according to the real-time voltage and current values of each pre-charging node, the method is as follows: Determine the inrush current magnitude of each pre-charging node according to the real-time voltage and current values of each pre-charging node, and determine the pre-charging sequence according to the order of the inrush currents of each pre-charging node from large to small; When the MCU control system determines the pre-charging timing sequence of each pre-charging node according to the power-on relationship of each pre-charging node and the real-time voltage and current values of each pre-charging node, the method is as follows: Determine the pre-charging nodes that must be powered on in sequence among all pre-charging nodes, and determine the pre-charging sequence according to the power-on sequence of each pre-charging node from first to last; The remaining pre-charging nodes determine the pre-charging sequence according to the order of their inrush currents from large to small.

9. The power supply control method according to claim 6, wherein The power supply control method further includes: after the pre-charging of the pre-charging branch is completed, a discharging resistor is connected at the pre-charging node.

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