Current limiting control circuit and method

Abstract

The application discloses a current-limiting control circuit and method, and relates to the technical field of battery control. The circuit comprises a current collection module connected with a battery, a main control module connected with the current collection module, and a power control module connected with the main control module. The power control module and the current collection module are also connected with the battery, a power supply and a load. The current collection module collects charging current output by the power supply and discharging current output by the battery and sends the current to the main control module. When the charging current is greater than a preset charging current threshold or when the discharging current is greater than a preset discharging current threshold, the main control module outputs a current-limiting control signal to the power control module. The power control module comprises a first power control unit and a second power control unit. The charging current or the discharging current is shunted, and the charging current or the discharging current is reduced according to the current-limiting control signal. The application solves the technical problem that a single converter cannot meet the current-limiting requirement when the power of an existing storage battery is large.

Description

Technical Field

[0001] This invention relates to the field of battery management technology, and in particular to a current limiting control circuit and method. Background Technology

[0002] Currently, in the current limiting control circuit of a battery, the charging current and discharging current of the battery pack are usually controlled by controlling the state of a single converter. However, as the power of batteries in actual application scenarios continues to increase, a single converter can no longer meet the current limiting requirements. Summary of the Invention

[0003] The main objective of this invention is to provide a current limiting control circuit and method, which aims to solve the technical problem that a single converter cannot meet the current limiting requirements when the power of the existing battery is large.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] In a first aspect, the present invention provides a current limiting control circuit, the circuit including a current acquisition module connected to a battery, a main control module connected to the current acquisition module, and a power control module connected to the main control module, the power control module and the current acquisition module also being connected to a battery, a power supply and a load respectively.

[0006] The current acquisition module is used to acquire the charging current output by the power supply and the discharging current output by the battery, and send the charging current and discharging current to the main control module.

[0007] The main control module is used to output a current limiting control signal to the power control module when the charging current is greater than the preset charging current threshold or when the discharging current is greater than the preset discharging current threshold.

[0008] The power control module includes a first power control unit and a second power control unit, which are used to shunt the charging current or discharging current and reduce the charging current or discharging current according to the current limiting control signal.

[0009] Optionally,

[0010] The main control module is also used to output charging control signals or discharging control signals based on the received charging or discharging signals;

[0011] The power control module is also used to connect the charging current output by the power supply to the battery according to the charging control signal, or to connect the discharging current output by the battery to the load according to the discharging control signal.

[0012] Optionally, the first power control unit includes switching device Q1, switching device Q2, inductor L1, switching device Q3, and switching device Q4;

[0013] The first pin of switch Q1 is connected to the positive terminal of the battery. The second pin of switch Q1 is connected to the first pin of switch Q2 and one end of inductor L1. The other end of inductor L1 is connected to the first pin of switch Q3 and the first pin of switch Q4. The second pin of switch Q3 is connected to the positive terminal of the load and the positive terminal of the power supply. The second pins of switch Q2 and switch Q4 are both grounded. The third pins of switch Q1, switch Q2, switch Q3 and switch Q4 are all connected to the main control module.

[0014] Optionally, the second power control unit includes switching device Q5, switching device Q6, inductor L2, switching device Q7, and switching device Q8;

[0015] The first pin of switch Q5 is connected to the positive terminal of the battery. The second pin of switch Q5 is connected to the first pin of switch Q6 and one end of inductor L2. The other end of inductor L2 is connected to the first pin of switch Q7 and the first pin of switch Q8. The second pin of switch Q7 is connected to the positive terminal of the load and the positive terminal of the power supply. The second pins of switch Q6 and switch Q8 are both grounded. The third pins of switch Q5, switch Q6, switch Q7 and switch Q8 are all connected to the main control module.

[0016] Optionally, the switching device used in the first power control unit is a field-effect transistor or a relay, and the switching device used in the second power control unit is a field-effect transistor or a relay.

[0017] Optionally, the current acquisition module includes a charging current acquisition unit and a discharging current acquisition unit. The charging current acquisition unit is connected to the battery and the main control module, respectively, and the discharging current acquisition unit is connected to the power supply, the load and the main control module, respectively.

[0018] The charging current acquisition unit is used to acquire the charging current output by the power supply and send the charging current to the main control module.

[0019] The discharge current acquisition unit is used to acquire the discharge current output by the battery and send the discharge current to the main control module.

[0020] Optionally, the charging current acquisition unit includes a resistor R1;

[0021] One end of resistor R1 is connected to the main control module, and the other end of resistor R1 is connected to the negative terminal of the battery.

[0022] Optionally, the discharge current acquisition unit includes a resistor R2;

[0023] One end of resistor R2 is connected to the main control module, and the other end of resistor R2 is connected to the negative terminal of the load and the negative terminal of the power supply.

[0024] Optionally, the circuit also includes a filter module connected to the power control module, battery, power supply and load respectively;

[0025] The filtering module is used to filter the charging current and the discharging current.

[0026] Secondly, the present invention also provides a current limiting control method applied to a current limiting control circuit, the method comprising:

[0027] The charging current output by the power supply and the discharging current output by the battery are collected by the current acquisition module, and the charging current and discharging current are sent to the main control module.

[0028] The main control module outputs a current limiting control signal to the power control module when the charging current exceeds the preset charging current threshold or when the discharging current exceeds the preset discharging current threshold.

[0029] The charging current or discharging current is shunted by the first power control unit and the second power control unit of the power control module, and the charging current or discharging current is reduced according to the current limiting control signal.

[0030] This invention provides a current-limiting control circuit and method. A current acquisition module collects the charging current output by the power supply and the discharging current output by the battery, and sends these currents to a main control module. The main control module outputs a current-limiting control signal to a power control module when the charging current exceeds a preset charging current threshold or the discharging current exceeds a preset discharging current threshold. The first and second power control units of the power control module shunt the charging or discharging current and reduce it according to the current-limiting control signal. By shunting the charging current from the power supply or the discharging current from the battery using two power control units within the power control module, and then limiting the shunt charging or discharging current according to the current-limiting control signal output by the main control module, the power control module can not only shunt the current when the battery power is high, but also further limit it, ensuring that the current in the circuit meets high current-limiting requirements. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of the first embodiment of the current limiting control circuit of the present invention;

[0033] Figure 2 This is a partial circuit diagram of the current limiting control circuit of the present invention;

[0034] Figure 3 This is a flowchart illustrating the first embodiment of the current limiting control method of the present invention.

[0035] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0037] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0038] In this invention, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that an apparatus or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an apparatus or system. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the apparatus or system that includes that element.

[0039] Furthermore, in this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. If the embodiments of this invention involve descriptions of "first," "second," etc., such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0040] In view of the technical problem that a single converter cannot meet the current limiting requirements when the existing battery power is large, the present invention provides a current limiting control circuit and method, the overall idea of ​​which is as follows:

[0041] The circuit includes a current acquisition module connected to the battery, a main control module connected to the current acquisition module, and a power control module connected to the main control module. The power control module and the current acquisition module are also connected to the battery, the power supply, and the load, respectively. The current acquisition module is used to acquire the charging current output by the power supply and the discharging current output by the battery, and send the charging current and discharging current to the main control module. The main control module is used to output a current limiting control signal to the power control module when the charging current exceeds a preset charging current threshold or when the discharging current exceeds a preset discharging current threshold. The power control module includes a first power control unit and a second power control unit, which are used to shunt the charging current or discharging current and reduce the charging current or discharging current according to the current limiting control signal.

[0042] This invention provides a current-limiting control circuit and method. A current acquisition module collects the charging current output by the power supply and the discharging current output by the battery, and sends these currents to a main control module. The main control module outputs a current-limiting control signal to a power control module when the charging current exceeds a preset charging current threshold or the discharging current exceeds a preset discharging current threshold. The first and second power control units of the power control module shunt the charging or discharging current and reduce it according to the current-limiting control signal. By shunting the charging current from the power supply or the discharging current from the battery using two power control units within the power control module, and then limiting the shunt charging or discharging current according to the current-limiting control signal output by the main control module, the power control module can not only shunt the current when the battery power is high, but also further limit it, ensuring that the current in the circuit meets high current-limiting requirements.

[0043] The current limiting control circuit and method of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] Example 1

[0045] Reference Figure 1 , Figure 1 This is a schematic diagram of the structure of the first embodiment of the current limiting control circuit of the present invention. This embodiment provides a current limiting control circuit, which includes a current acquisition module connected to a battery, a main control module connected to the current acquisition module, and a power control module connected to the main control module. The power control module and the current acquisition module are also connected to the battery, the power supply, and the load, respectively.

[0046] The current acquisition module is used to acquire the charging current output by the power supply and the discharging current output by the battery, and send the charging current and discharging current to the main control module.

[0047] The main control module is used to output a current limiting control signal to the power control module when the charging current is greater than the preset charging current threshold or when the discharging current is greater than the preset discharging current threshold.

[0048] The power control module includes a first power control unit and a second power control unit, which are used to shunt the charging current or discharging current and reduce the charging current or discharging current according to the current limiting control signal.

[0049] In this embodiment, the battery includes a storage battery or battery pack, and the power supply includes mains power. The power supply can be connected to the circuit via a charging regulator. The load is set according to the actual situation. In battery discharge mode, the battery output current is generally larger than the current that the load can withstand. Therefore, in the actual discharge process, the battery discharge current is determined by the power of the load. That is, the preset discharge current threshold is determined according to the actual load power. Correspondingly, the charging current is the current output from the power supply to the battery when the battery is charging. The charging current is determined by the battery power. That is, the preset charging current threshold is determined according to the actual battery power. The first power control unit and the second power control unit are both connected to the battery, the load, and the power supply. The charging current and the discharge current are shunt by the first power control unit and the second power control unit. The first power control unit and the second power control unit control the two shunt charging currents and the shunt discharge currents respectively according to the received line control signals. This can control the magnitude of the charging current and the discharge current and achieve the current limiting function. The main control module can include various microcontrollers, and the microcontroller can be selected according to actual needs.

[0050] In practice, during the charging and discharging processes of the battery, the charging current output by the power supply and the discharging current output by the battery are collected by the current acquisition module and sent to the main control module. When the charging current exceeds a preset charging current threshold or the discharging current exceeds a preset discharging current threshold, the main control module outputs a current limiting control signal to the power control module. The first power control unit and the second power control unit in the power control module divide the charging current or discharging current and reduce the charging current or discharging current according to the current limiting control signal, so that the charging current is less than or equal to the preset charging current threshold and the discharging current is less than or equal to the preset discharging current threshold, thereby realizing current limiting control for battery charging and discharging.

[0051] This embodiment provides a current limiting control circuit. By using two power control units in the power control module to shunt the charging current output by the power supply or the discharging current output by the battery, the two power control units further limit the shunt charging current or the shunt discharging current according to the current limiting control signal output by the main control module. When the battery power is large, the power control module can not only shunt the current, but also further limit the current on the basis of shunt, ensuring that the current in the circuit can meet the high current limiting requirements. This solves the technical problem that existing single converters cannot meet the current limiting requirements when the battery power is large.

[0052] Specifically, the main control module is also used to output charging control signals or discharging control signals based on the received charging or discharging signals;

[0053] The power control module is also used to connect the charging current output by the power supply to the battery according to the charging control signal, or to connect the discharging current output by the battery to the load according to the discharging control signal.

[0054] In this embodiment, the current limiting control circuit may include an interface module. The power supply and the load can be connected to the current limiting control circuit through the interface module. When the interface module is connected to the power supply, the main control module receives a charging signal. When the interface module is connected to the load, the main control module receives a discharging signal according to the working signal of the load.

[0055] In practice, when the circuit is connected to the power supply, the main control module receives a charging signal and outputs a charging control signal to the power control module. The power control module operates according to the charging control signal, connecting the charging current output by the power supply to the battery. When the circuit is connected to the load and the load is in operation, the main control module receives a discharging signal and outputs a discharging control signal to the power control module. The power control module operates according to the discharging control signal, connecting the discharging current output by the battery to the load.

[0056] Specifically, such as Figure 2 As shown, the first power control unit includes switching device Q1, switching device Q2, inductor L1, switching device Q3, and switching device Q4;

[0057] The first pin of switch Q1 is connected to the positive terminal of battery E1. The second pin of switch Q1 is connected to the first pin of switch Q2 and one end of inductor L1. The other end of inductor L1 is connected to the first pin of switch Q3 and the first pin of switch Q4. The second pin of switch Q3 is connected to the positive terminal of load RL and the positive terminal of power supply E2. The second pins of switch Q2 and switch Q4 are both grounded. The third pins of switch Q1, switch Q2, switch Q3 and switch Q4 are all connected to the main control module.

[0058] In this embodiment, the switching device used in the first power control unit is a field-effect transistor or a relay. Preferably, the switching device is a field-effect transistor. The drain of the switching device Q1 is connected to the positive terminal of the battery E1. The source of the switching device Q1 is connected to the drain of the switching device Q2 and one end of the inductor L1. The other end of the inductor L1 is connected to the source of the switching device Q3 and the drain of the switching device Q4. The drain of the switching device Q3 is connected to the positive terminal of the load RL and the positive terminal of the power supply E2. The sources of the switching devices Q2 and Q4 are both grounded. The gates of the switching devices Q1, Q2, Q3, and Q4 are all connected to the main control module.

[0059] In practice, during battery charging, the main control module outputs a charging control signal based on the received charging signal, controlling switch Q2 to turn off and switches Q1 and Q3 to turn on. The charging current output by power supply E2 is shunted through switches Q1 and Q3 and connected to battery E1. When the charging current received by the main control module from the current acquisition module is greater than the preset charging current threshold, a current limiting control signal is output, controlling switch Q4 to turn on. The current is shunted through switch Q4, reducing the charging current after being shunted through switches Q1 and Q3. When the charging current decreases to less than or equal to the preset charging current threshold, the main control module outputs a current limiting control signal, and switch Q4 turns off.

[0060] When the battery is discharging, the main control module outputs a discharge control signal based on the received discharge signal, controlling switch Q4 to turn off and switches Q1 and Q3 to turn on. The discharge current output by battery E1 is shunted through switches Q1 and Q3 and connected to the load RL. When the discharge current received by the main control module from the current acquisition module is greater than the preset discharge current threshold, a current limiting control signal is output, controlling switch Q2 to turn on. The current is shunted through switch Q2, which reduces the charging current after being shunted through switches Q1 and Q3, thus reducing the charging current. When the charging current decreases to less than or equal to the preset discharge current threshold, the main control module outputs a current limiting control signal, and switch Q2 turns off.

[0061] Specifically, such as Figure 2 As shown, the second power control unit includes switching device Q5, switching device Q6, inductor L2, switching device Q7, and switching device Q8;

[0062] The first pin of switch Q5 is connected to the positive terminal of battery E1. The second pin of switch Q5 is connected to the first pin of switch Q6 and one end of inductor L2. The other end of inductor L2 is connected to the first pin of switch Q7 and the first pin of switch Q8. The second pin of switch Q7 is connected to the positive terminal of load RL and the positive terminal of power supply E2. The second pins of switch Q6 and switch Q8 are both grounded. The third pins of switch Q5, switch Q6, switch Q7 and switch Q8 are all connected to the main control module.

[0063] In this embodiment, the switching device used in the second power control unit is a field-effect transistor or a relay. Preferably, the switching device is a field-effect transistor. The drain of the switching device Q5 is connected to the positive terminal of the battery E1. The source of the switching device Q5 is connected to the drain of the switching device Q6 and one end of the inductor L2. The other end of the inductor L2 is connected to the source of the switching device Q7 and the drain of the switching device Q8. The drain of the switching device Q7 is connected to the positive terminal of the load RL and the positive terminal of the power supply E2. The sources of the switching devices Q6 and Q8 are both grounded. The gates of the switching devices Q5, Q6, Q7, and Q8 are all connected to the main control module.

[0064] In practice, during battery charging, the main control module outputs a charging control signal based on the received charging signal, controlling switch Q6 to turn off and switches Q5 and Q7 to turn on. The charging current output by power supply E2 is shunted through switches Q5 and Q7 and connected to battery E1. When the charging current received by the main control module from the current acquisition module exceeds the preset charging current threshold, a current limiting control signal is output, controlling switch Q8 to turn on. The current is shunted through switch Q8, reducing the charging current after shunting through switches Q5 and Q7. When the charging current decreases to less than or equal to the preset charging current threshold, the main control module outputs a current limiting control signal, and switch Q8 turns off.

[0065] During battery discharge, the main control module outputs a discharge control signal based on the received discharge signal, controlling switch Q8 to turn off and switches Q5 and Q7 to turn on. The discharge current output by battery E1 is shunted through switches Q5 and Q7 and connected to the load. When the discharge current received by the main control module from the current acquisition module is greater than the preset discharge current threshold, a current limiting control signal is output, controlling switch Q6 to turn on. The current is shunted through switch Q6, reducing the charging current after being shunted through switches Q5 and Q7, thus reducing the charging current. When the charging current decreases to less than or equal to the preset discharge current threshold, the main control module outputs a current limiting control signal, and switch Q6 turns off.

[0066] This embodiment provides a current limiting control circuit that uses two power control modules to shunt the charging and discharging currents of the battery. By controlling the state of the switching devices in the two power control modules respectively, the shunt charging and discharging currents are adjusted, thereby achieving the current limiting effect of the battery's charging and discharging currents. Furthermore, in this embodiment, field-effect transistors are used as the switching devices, which are low-cost, thus reducing the cost of current limiting control.

[0067] Specifically, the current acquisition module includes a charging current acquisition unit and a discharging current acquisition unit. The charging current acquisition unit is connected to the battery and the main control module, respectively, and the discharging current acquisition unit is connected to the power supply, the load and the main control module, respectively.

[0068] The charging current acquisition unit is used to acquire the charging current output by the power supply and send the charging current to the main control module.

[0069] The discharge current acquisition unit is used to acquire the discharge current output by the battery and send the discharge current to the main control module.

[0070] Specifically, such as Figure 2 As shown, the charging current acquisition unit includes a resistor R1;

[0071] One end of resistor R1 is connected to the main control module, and the other end of resistor R1 is connected to the negative terminal of battery E1.

[0072] Specifically, such as Figure 2 As shown, the discharge current acquisition unit includes a resistor R2;

[0073] One end of resistor R2 is connected to the main control module, and the other end of resistor R2 is connected to the negative terminal of the load RL and the negative terminal of the power supply E2.

[0074] In this embodiment, one end of resistor R1 is also connected to one end of resistor R2 and grounded. Resistors R1 and R2 are used to collect charging current and discharging current, respectively.

[0075] In the specific implementation, one end of resistor R1 is connected to the main control module, and the other end of resistor R1 is connected to the negative terminal of battery E1, so as to send the charging current of battery to the main control module; one end of resistor R2 is connected to the main control module, and the other end of resistor R2 is connected to the negative terminal of load RL and the negative terminal of power supply E2, so as to send the discharging current of battery E1 to the main control module.

[0076] This embodiment provides a current limiting control method that sends the charging current and discharging current to the main control module through two resistors, thereby realizing the current acquisition function.

[0077] Specifically, the circuit also includes a filter module connected to the power control module, battery, power supply and load respectively;

[0078] The filtering module is used to filter the charging current and the discharging current.

[0079] In this embodiment, as Figure 2As shown, the filter module includes capacitor C1 and capacitor C2. One end of capacitor C1 is connected to the positive terminal of battery E1, and the other end is connected to the negative terminal of battery E1. One end of capacitor C2 is connected to the positive terminal of load RL and the positive terminal of power supply E2, and the other end is connected to the negative terminal of load RL and the negative terminal of power supply E2.

[0080] In the specific implementation, one end of capacitor C1 is connected to the positive terminal of battery E1, and the other end is connected to the negative terminal of battery E1 to filter the charging current of battery E1; one end of capacitor C2 is connected to the positive terminal of load RL and the positive terminal of power supply E2, and the other end is connected to the negative terminal of load RL and the negative terminal of power supply E2 to filter the discharging current of battery E1.

[0081] This embodiment provides a current limiting control circuit that uses two capacitors to filter the charging current and discharging current respectively, thereby removing current interference in the charging current and discharging current.

[0082] Example 2

[0083] Reference Figure 3 , Figure 3 This is a flowchart illustrating the first embodiment of the current limiting control method of the present invention. Based on the same inventive concept, this embodiment provides a current limiting control method applied to a current limiting control circuit, the method comprising:

[0084] Step S100: Collect the charging current output by the power supply and the discharging current output by the battery through the current acquisition module, and send the charging current and discharging current to the main control module;

[0085] Step S200: The main control module outputs a current limiting control signal to the power control module when the charging current is greater than the preset charging current threshold or when the discharging current is greater than the preset discharging current threshold.

[0086] Step S300: The charging current or discharging current is shunted by the first power control unit and the second power control unit of the power control module, and the charging current or discharging current is reduced according to the current limiting control signal.

[0087] This embodiment provides a current limiting control method. By using two power control units in the power control module to shunt the charging current output by the power supply or the discharging current output by the battery, the two power control units then limit the shunt charging current or the shunt discharging current according to the current limiting control signal output by the main control module. When the battery power is large, the power control module can not only shunt the current, but also further limit the current on the basis of shunt, ensuring that the current in the circuit can meet the high current limiting requirements. This solves the technical problem that a single converter cannot meet the current limiting requirements when the existing battery power is large.

[0088] It should be noted that, since more implementation details of the method steps in this embodiment can be found in the description of the specific implementation of the current limiting control circuit in Embodiment 1, for the sake of brevity, they will not be repeated here.

[0089] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A current limiting control circuit, characterized in that, The circuit includes a current acquisition module connected to the battery, a main control module connected to the current acquisition module, and a power control module connected to the main control module. The power control module and the current acquisition module are also connected to the battery, the power supply, and the load, respectively. The current acquisition module is used to acquire the charging current output by the power supply and the discharging current output by the battery, and send the charging current and the discharging current to the main control module. The main control module is used to output a current limiting control signal to the power control module when the charging current is greater than a preset charging current threshold or when the discharging current is greater than a preset discharging current threshold. The power control module includes a first power control unit and a second power control unit, used to shunt the charging current or the discharging current, and reduce the charging current or the discharging current according to the current limiting control signal; The main control module is also used to output a charging control signal or a discharging control signal based on the received charging signal or discharging signal. The power control module is also used to connect the charging current output by the power supply to the battery according to the charging control signal, or to connect the discharging current output by the battery to the load according to the discharging control signal. The first power control unit includes switching device Q1, switching device Q2, inductor L1, switching device Q3, and switching device Q4; The first pin of the switching device Q1 is connected to the positive terminal of the battery. The second pin of the switching device Q1 is connected to the first pin of the switching device Q2 and one end of the inductor L1. The other end of the inductor L1 is connected to the first pin of the switching device Q3 and the first pin of the switching device Q4. The second pin of the switching device Q3 is connected to the positive terminal of the load and the positive terminal of the power supply. The second pins of the switching devices Q2 and Q4 are both grounded. The third pins of the switching devices Q1, Q2, Q3, and Q4 are all connected to the main control module. The second power control unit includes switching device Q5, switching device Q6, inductor L2, switching device Q7, and switching device Q8; The first pin of the switching device Q5 is connected to the positive terminal of the battery. The second pin of the switching device Q5 is connected to the first pin of the switching device Q6 and one end of the inductor L2. The other end of the inductor L2 is connected to the first pin of the switching device Q7 and the first pin of the switching device Q8. The second pin of the switching device Q7 is connected to the positive terminal of the load and the positive terminal of the power supply. The second pins of the switching devices Q6 and Q8 are both grounded. The third pins of the switching devices Q5, Q6, Q7, and Q8 are all connected to the main control module. The switching devices used in the first power control unit are field-effect transistors or relays, and the switching devices used in the second power control unit are field-effect transistors or relays.

2. The circuit as described in claim 1, characterized in that, The current acquisition module includes a charging current acquisition unit and a discharging current acquisition unit. The charging current acquisition unit is connected to the battery and the main control module, respectively, and the discharging current acquisition unit is connected to the power supply, the load and the main control module, respectively. The charging current acquisition unit is used to acquire the charging current output by the power supply and send the charging current to the main control module. The discharge current acquisition unit is used to acquire the discharge current output by the battery and send the discharge current to the main control module.

3. The circuit as described in claim 2, characterized in that, The charging current acquisition unit includes a resistor R1; One end of the resistor R1 is connected to the main control module, and the other end of the resistor R1 is connected to the negative terminal of the battery.

4. The circuit as described in claim 3, characterized in that, The discharge current acquisition unit includes a resistor R2; One end of the resistor R2 is connected to the main control module, and the other end of the resistor R2 is connected to the negative terminal of the load and the negative terminal of the power supply.

5. The circuit as described in claim 1, characterized in that, The circuit also includes a filter module connected to the power control module, the battery, the power supply and the load respectively; The filtering module is used to filter the charging current and the discharging current.

6. A current limiting control method, characterized in that, The method is applied to the current limiting control circuit according to any one of claims 1 to 5, and the method includes: The charging current output by the power supply and the discharging current output by the battery are collected by the current acquisition module, and the charging current and the discharging current are sent to the main control module. The main control module outputs a current limiting control signal to the power control module when the charging current is greater than a preset charging current threshold or when the discharging current is greater than a preset discharging current threshold. The charging current or the discharging current is shunted by the first power control unit and the second power control unit of the power control module, and the charging current or the discharging current is reduced according to the current limiting control signal.

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