Multi-group chopper circuit parallel current sharing control system
By integrating chopper circuits, switch selection modules, impedance detection modules, and current control modules, intelligent power supply and current sharing control for electrical equipment are achieved, solving the problem of uneven current distribution in multiple parallel chopper circuits and ensuring stable equipment operation and system efficiency.
Patent Information
- Application Number
- CN202520319575.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-26
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-02-26
AI Technical Summary
In multiple parallel chopper circuits, uneven current distribution, overload, or insufficient load can affect system stability and the safe operation of electrical equipment.
By integrating a chopper circuit, a switch selection module, an impedance detection module, a current control module, and a main control module, intelligent power supply and current sharing control for electrical equipment are achieved. The impedance of the electrical equipment is detected first, and then the current is precisely adjusted. The working states of multiple chopper modules are coordinated to achieve current sharing.
To ensure the stable operation of electrical equipment, enhance power supply capacity and load adaptability, avoid overload or underload, and guarantee the stable and efficient operation of the power supply system.
Smart Images
Figure CN223829229U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of current control technology, and in particular to a current sharing control system for multiple sets of chopper circuits connected in parallel. Background Technology
[0002] In power electronic systems, current sharing across multiple parallel chopper circuits is a critical technical issue, directly impacting system stability, reliability, and efficiency. In parallel chopper circuits, each component experiences the same voltage, while the current magnitude is determined by the impedance of each component. Traditional power supply systems often struggle to provide precise power to equipment with varying load characteristics, especially in scenarios involving multiple devices connected in parallel. Uneven current distribution, overload, or underload problems frequently occur, severely affecting system stability and the safe operation of the equipment. Utility Model Content
[0003] This disclosure provides a multi-group chopper circuit parallel current sharing control system to improve the stability of the power supply system.
[0004] This disclosure provides a multi-group chopper circuit parallel current sharing control system, including: multiple chopper modules;
[0005] The multiple chopper modules are connected in parallel;
[0006] Any of the chopper modules includes: a chopper circuit, a switch selection module, an impedance detection module, a current control module, and a main control module;
[0007] The input terminal of the chopper circuit is connected to a DC power supply, the control terminal of the chopper circuit is connected to the main control module, the output terminal of the chopper circuit is connected to the input terminal of the switch selection module, the first output terminal of the switch selection module is connected to the input terminal of the current control module, the second output terminal of the switch selection module is connected to the first terminal of the impedance detection module, and the control terminal of the switch selection module is connected to the main control module.
[0008] The output terminal of the current control module is used to connect to the electrical equipment, and the control terminal of the current control module is connected to the main control module.
[0009] The second end of the impedance detection module is used to connect to the electrical equipment, and the control end of the impedance detection module is connected to the main control module.
[0010] In one exemplary embodiment of this disclosure, the impedance detection module includes: an impedance matching unit and an impedance detection unit;
[0011] The first end of the impedance matching unit is connected to the second output end of the switch selection module, the second end of the impedance matching unit is connected to the electrical equipment, and the control end of the impedance matching unit is connected to the main control module.
[0012] The first end of the impedance detection module is connected to the electrical equipment, and the second end of the impedance detection unit is connected to the main control module.
[0013] In one exemplary embodiment of this disclosure, the impedance matching unit includes resistor R1, resistor R2, and digital potentiometer U1;
[0014] The first end of resistor R1 is connected to the second output terminal of the switch selection module, the first end of resistor R2 is connected to the first end of resistor R2, the second end of resistor R1 is connected to the output terminal of digital potentiometer U1, the high end of digital potentiometer U1 is connected to VCC power supply, the low end of digital potentiometer U1 is grounded, the power supply terminal of digital potentiometer U1 is connected to VCC power supply, and the communication terminal of digital potentiometer U1 is connected to the main control module.
[0015] The second end of the resistor R2 is grounded through the resistor RX, where the resistor RX is the equivalent resistance of the electrical equipment, and the second end of the resistor R2 is connected to the impedance detection unit.
[0016] In one exemplary embodiment of this disclosure, the impedance detection unit includes: a rheostat RP1, a capacitor C1, and a Zener diode U2;
[0017] The first end of the variable resistor RP1 is connected to the second end of the resistor R2. The second end of the variable resistor RP1 is grounded. The sliding end of the variable resistor RP1 is connected to the main control module. The sliding end of the variable resistor RP1 is grounded through the capacitor C1. The sliding end of the variable resistor RP1 is connected to the cathode of the Zener diode U2. The anode of the Zener diode U2 is grounded.
[0018] In one exemplary embodiment of this disclosure, the impedance matching unit further includes: a switching transistor Q2;
[0019] The first terminal of the switching transistor Q2 is connected to the VCC power supply, the second terminal of the switching transistor Q2 is grounded, and the control terminal of the switching transistor Q2 is connected to the main control module.
[0020] In one exemplary embodiment of this disclosure, the switch selection module includes: a relay K1 and a switching transistor Q1;
[0021] The control terminal of the switching transistor Q1 is connected to the main control module. The first terminal of the switching transistor Q1 is connected to the first terminal of the relay K1. The second terminal of the switching transistor Q1 is grounded. The second terminal of the relay K1 is connected to the VDD power supply. The third terminal of the relay K1 is connected to the DC power supply. The fourth terminal of the relay K1 is connected to the input terminal of the current control module. The fifth terminal of the relay K1 is connected to the first terminal of the impedance detection module.
[0022] In one exemplary embodiment of this disclosure, the system further includes: a fault detection module; the input terminal of the fault detection module is connected to the detection terminal of the current control module, and the output terminal of the fault detection module is connected to the main control module.
[0023] In one exemplary embodiment of this disclosure, it further includes: a wireless communication module;
[0024] The main control module communicates with the monitoring platform through the wireless communication module.
[0025] The beneficial effects of the parallel current sharing control system with multiple chopper circuits provided in this disclosure are as follows: By integrating chopper circuits, switch selection modules, impedance detection modules, current control modules, and main control modules, this disclosure achieves intelligent power supply and current sharing control for electrical equipment. This disclosure can first detect the impedance of the electrical equipment and then precisely regulate the current to ensure stable equipment operation. Simultaneously, the parallel design of multiple chopper modules enhances power supply capacity and load adaptability. Through the coordination of the main control module, current sharing among the modules is achieved, avoiding overload or underload, and ensuring the stable and efficient operation of the entire power supply system. Attached Figure Description
[0026] To more clearly illustrate the technical solutions in the embodiments of this disclosure, 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 this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0027] Figure 1 This is a schematic diagram of the structure of a parallel current sharing control system for multiple chopper circuits provided in an embodiment of this disclosure;
[0028] Figure 2 This is a schematic diagram of the structure of a parallel current sharing control system for multiple chopper circuits provided in another embodiment of this disclosure;
[0029] Figure 3 This is a circuit diagram of a parallel current sharing control system for multiple chopper circuits provided in an embodiment of this disclosure;
[0030] Figure 4This is a schematic diagram of the structure of a parallel current sharing control system for multiple chopper circuits provided in another embodiment of this disclosure. Detailed Implementation
[0031] To enable those skilled in the art to better understand this solution, the technical solutions in the embodiments of this solution will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this solution, not all of them. Based on the embodiments of this solution, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this solution.
[0032] The term "comprising" and any other variations thereof in the specification, claims, and accompanying drawings of this invention mean "including but not limited to," and are intended to cover a non-exclusive inclusion, not limited to the examples listed herein. Furthermore, the terms "first" and "second," etc., are used to distinguish different objects, not to describe a specific order.
[0033] The implementation of this disclosure will be described in detail below with reference to the specific accompanying drawings:
[0034] Figure 1 This is a schematic diagram of a parallel current sharing control system for multiple chopper circuits provided in an embodiment of this disclosure. (Refer to...) Figure 1 The parallel current sharing control system of multiple chopper circuits includes: multiple chopper modules; multiple chopper modules connected in parallel; each chopper module includes: a chopper circuit, a switch selection module, an impedance detection module, a current control module, and a main control module; the input terminal of the chopper circuit is connected to a DC power supply, the control terminal of the chopper circuit is connected to the main control module, the output terminal of the chopper circuit is connected to the input terminal of the switch selection module, the first output terminal of the switch selection module is connected to the input terminal of the current control module, the second output terminal of the switch selection module is connected to the first terminal of the impedance detection module, and the control terminal of the switch selection module is connected to the main control module; the output terminal of the current control module is used to connect to electrical equipment, and the control terminal of the current control module is connected to the main control module; the second terminal of the impedance detection module is used to connect to electrical equipment, and the control terminal of the impedance detection module is connected to the main control module.
[0035] In this embodiment, the chopper circuit is controlled by the main control module. Under the control of the main control module, the chopper circuit can step down the high-voltage DC signal to obtain a voltage signal suitable for the operation of the electrical equipment. For example, a Buck step-down circuit.
[0036] After multiple chopper modules are connected to the electrical equipment, the switch selection module, under the control of the main control module, connects its internal switch to the impedance detection module. This allows the signal output from the chopper circuit to be transmitted through the switch selection module to the impedance detection module, initiating the impedance detection of the electrical equipment. This determines the true impedance of the electrical equipment, and then the current flowing through the equipment is controlled based on this true impedance to ensure reliable operation.
[0037] After impedance detection is completed, the switch selection module, under the control of the main control module, disconnects the impedance detection module and simultaneously connects the current control module. The main control module then sends a control signal to the current control module based on the previously detected impedance information of the electrical equipment.
[0038] The current control module can be composed of transistors. Through the current amplification characteristics of transistors, a small change in the base current will cause a large change in the current between the collector and emitter, thereby achieving precise control of the current of the electrical equipment and ensuring that the electrical equipment can operate stably with a suitable current while meeting its impedance.
[0039] In this embodiment, multiple chopper modules are connected in parallel to supply power to multiple electrical devices or a single electrical device. When supplying power to the electrical device, impedance detection is first performed to understand the load characteristics of the electrical device. Then, based on the detected impedance information, the main control module coordinates with the current control module to precisely control the current and ensure the reliable operation of the electrical device.
[0040] The chopper circuit provides a voltage reduction function, converting the high-voltage signal of the DC power supply into a voltage signal suitable for the electrical equipment. Multiple chopper modules connected in parallel can meet different load requirements or improve the system's power supply capacity. Current sharing control, primarily achieved by the main control module based on feedback information from the impedance detection and current control modules within each chopper module, adjusts the operating state of each module to ensure balanced current output from each module. This prevents overload or underload of any particular module, guaranteeing the stable and efficient operation of the entire system.
[0041] As can be seen from the above, this embodiment achieves intelligent power supply and current sharing control for electrical equipment by integrating a chopper circuit, a switch selection module, an impedance detection module, a current control module, and a main control module. This embodiment can first detect the impedance of the electrical equipment and then precisely adjust the current to ensure stable equipment operation. Simultaneously, the parallel design of multiple chopper modules enhances power supply capacity and load adaptability. Through the coordination of the main control module, current sharing among the modules is achieved, avoiding overload or underload, and ensuring the stable and efficient operation of the entire power supply system.
[0042] like Figure 2As shown, in one embodiment of this disclosure, the impedance detection module includes: an impedance matching unit and an impedance detection unit; the first end of the impedance matching unit is connected to the second output end of the switch selection module, the second end of the impedance matching unit is connected to the electrical equipment, and the control end of the impedance matching unit is connected to the main control module; the first end of the impedance detection module is connected to the electrical equipment, and the second end of the impedance detection unit is connected to the main control module.
[0043] In this embodiment,
[0044] When multiple chopper modules are connected to the electrical equipment, the switch selection module guides the signal to the impedance matching unit under the control of the main control module.
[0045] Digital potentiometers and electrical equipment can be combined to form an impedance matching unit. The equivalent impedance of the electrical equipment and the digital potentiometer can be combined to form a bridge. By adjusting the output resistance of the digital potentiometer until the bridge is balanced, the equivalent impedance of the electrical equipment can be obtained.
[0046] The main control module can send control signals to the digital potentiometer to adjust its output resistance. During the adjustment process, the resistance of the digital potentiometer is continuously changed to achieve a balanced bridge. Based on the principle of bridge balance, when the bridge is balanced, the resistances of the four arms of the bridge satisfy a certain proportional relationship (i.e., the resistance ratios of the opposite arms are equal). At this point, by measuring known resistances (the resistance of the digital potentiometer) and known power supply voltages, the equivalent impedance of the unknown electrical equipment can be calculated.
[0047] As can be seen from the above, the impedance detection module in this embodiment forms a bridge circuit through the impedance matching unit and adjusts it to a balanced state. Then, the impedance detection unit detects the equivalent impedance of the electrical equipment and feeds the information back to the main control module. This serves as an important foundation for the entire system to achieve intelligent power supply and current sharing control, ensuring flexible and precise control of the system under different load conditions.
[0048] like Figure 3 As shown, in one embodiment of this disclosure, the impedance matching unit includes resistors R1 and R2, and a digital potentiometer U1; the first end of resistor R1 is connected to the second output terminal of the switch selection module, the first end of resistor R2 is connected to the first end of resistor R2, the second end of resistor R1 is connected to the output terminal of digital potentiometer U1, the high end of digital potentiometer U1 is connected to the VCC power supply, the low end of digital potentiometer U1 is grounded, the power supply terminal of digital potentiometer U1 is connected to the VCC power supply, and the communication terminal of digital potentiometer U1 is connected to the main control module; the second end of resistor R2 is grounded through resistor RX, where resistor RX is the equivalent resistance of the electrical equipment, and the second end of resistor R2 is connected to the impedance detection unit.
[0049] In this embodiment, resistors R1 and R2, the digital potentiometer U1, and the equivalent resistance RX of the electrical device constitute a bridge. When the bridge is balanced, the current flowing through it is zero; otherwise, current will flow through the bridge. The impedance detection unit is used to detect the magnitude of the current flowing through the bridge, and the balance of the bridge can be determined by the current flowing through it.
[0050] Among them, resistors R1 and R2 are known resistors. When the bridge is in balance, the resistance value of digital potentiometer U1 is determined based on the adjustment of digital potentiometer U1. Then, based on the principle that the resistance ratio of the two arms is equal, the equivalent resistance RX of the electrical equipment is obtained.
[0051] As shown above, a bridge circuit is constructed using resistors R1 and R2, a digital potentiometer U1, and the equivalent resistance RX of the electrical equipment. Impedance detection is achieved using the bridge balance principle. Since resistors R1 and R2 are known, by adjusting the digital potentiometer U1 and monitoring the current, the bridge balance can be accurately determined, and the equivalent resistance RX can be calculated. This design provides a precise impedance detection method for the system, which is helpful for subsequent current control, ensuring the system's stable and efficient operation and adaptability to different loads.
[0052] like Figure 3 As shown, in one embodiment of this disclosure, the impedance detection unit includes: a variable resistor RP1, a capacitor C1, and a Zener diode U2; the first end of the variable resistor RP1 is connected to the second end of the resistor R2, the second end of the variable resistor RP1 is grounded, the sliding end of the variable resistor RP1 is connected to the main control module, the sliding end of the variable resistor RP1 is grounded through the capacitor C1, the sliding end of the variable resistor RP1 is connected to the cathode of the Zener diode U2, and the anode of the Zener diode U2 is grounded.
[0053] In this embodiment, when the bridge is balanced, the current flowing through the bridge is 0; otherwise, current will flow through the bridge.
[0054] The variable resistor RP1, capacitor C1, and Zener diode U2 constitute an impedance detection unit. When the bridge is not balanced, there is current in the circuit. When the current flows through the variable resistor RP1, a voltage signal is generated. The voltage at the sliding end of the variable resistor RP1 can be used to determine whether the bridge has reached a balanced state.
[0055] Capacitor C1 filters the signal passing through rheostat RP1, removing high-frequency interference signals to ensure the stability and accuracy of the detection signal. Zener diode U2 regulates the voltage at the sliding terminal of rheostat RP1. When the voltage at the sliding terminal exceeds the Zener diode U2's regulation value, the Zener diode discharges the excess voltage, stabilizing the voltage at the sliding terminal within a certain range and preventing damage to the main control module and other subsequent circuits due to excessive voltage.
[0056] like Figure 3As shown, in one embodiment of this disclosure, the impedance matching unit further includes: a switching transistor Q2; the first terminal of the switching transistor Q2 is connected to the VCC power supply, the second terminal of the switching transistor Q2 is grounded, and the control terminal of the switching transistor Q2 is connected to the main control module.
[0057] In this embodiment, when the electrical equipment is connected, the control module can send a high-level signal to the switch Q2. Switch Q2 turns on, and simultaneously, the switch inside the switch selection module connects to resistors R1 and R2, at which point the device enters the impedance detection state. After the impedance detection of the electrical equipment is completed, the main control module sends a low-level signal to the control terminal of switch Q2, causing switch Q2 to turn off and the digital potentiometer to stop working.
[0058] As can be seen from the above, when the electrical equipment is connected, the main control module sends a high-level signal to turn it on. Simultaneously, the switch selection module connects resistors R1 and R2, putting the system into impedance detection mode, which is convenient to operate. After the detection is complete, the main control module sends a low-level signal to turn off the switch Q2, stopping the digital potentiometer from working. This achieves effective control over the digital potentiometer's operating state, avoiding unnecessary energy consumption and optimizing the overall system performance.
[0059] like Figure 3 As shown, in one embodiment of this disclosure, the switch selection module includes: a relay K1 and a switching transistor Q1; the control terminal of the switching transistor Q1 is connected to the main control module, the first terminal of the switching transistor Q1 is connected to the first terminal of the relay K1, the second terminal of the switching transistor Q1 is grounded, the second terminal of the relay K1 is connected to the VDD power supply, the third terminal of the relay K1 is connected to the DC power supply, the fourth terminal of the relay K1 is connected to the input terminal of the current control module, and the fifth terminal of the relay K1 is connected to the first terminal of the impedance detection module.
[0060] In this embodiment, when the electrical equipment is connected, the main control module sends a high-level signal to the control terminal of the switching transistor Q1. Upon receiving the high-level signal, the switching transistor Q1 turns on, creating a circuit between the first and second terminals of the relay K1. Since the second terminal of the relay K1 is connected to the VDD power supply, the relay K1 is energized and activated. At this time, the third and fifth terminals of the relay K1 are connected, allowing the signal output from the DC power supply to be guided to the first terminal of the impedance detection module, initiating the impedance detection state of the electrical equipment. During this process, current flows through the impedance detection module to detect the impedance of the electrical equipment.
[0061] After impedance detection is complete, the main control module sends a low-level signal to the control terminal of switch Q1. Upon receiving the low-level signal, switch Q1 cuts off, disconnecting the power supply to relay K1. At this time, relay K1 ceases operation, and its internal switch switches, connecting the third and fourth terminals of relay K1. Thus, the signal output from the DC power supply is guided to the input terminal of the current control module, and the system enters power supply mode, providing power to the electrical equipment controlled by the current control module.
[0062] like Figure 4 As shown, in one embodiment of this disclosure, it further includes: a fault detection module; the input terminal of the fault detection module is connected to the detection terminal of the current control module, and the output terminal of the fault detection module is connected to the main control module.
[0063] In this embodiment, the fault detection module is connected to the detection terminal of the current control module through its input terminal to monitor the operating status of the current control module. It can acquire various signals related to the current control module in real time, including information such as current magnitude, voltage fluctuations, and abnormal current waveforms.
[0064] The fault detection module uses its built-in detection mechanisms and circuits to analyze and process the acquired signals. For example, it can compare the acquired signals with preset normal ranges or standard values using comparators, sensors, or other detection circuits to determine if any abnormalities exist. Upon receiving fault information, the main control module can react accordingly based on preset fault handling procedures. For example, it can pause system operation, adjust the operating parameters of the current control module, or issue alarm signals.
[0065] like Figure 4 As shown, in one embodiment of this disclosure, it further includes: a wireless communication module; the main control module is connected to the monitoring platform via the wireless communication module.
[0066] In this embodiment, the wireless communication module is a module with wireless communication capabilities. It can use wireless communication protocols such as Wi-Fi, Bluetooth, Zigbee, LoRa, or others to encode and modulate the information collected by the main control module, converting it into a signal format suitable for wireless transmission. After the main control module transmits the information to be sent to the wireless communication module, the wireless communication module can send this information out in the form of wireless signals. These signals can be transmitted within a certain wireless frequency band and sent to the monitoring platform through a wireless transmission medium (such as air). The monitoring platform can receive information from the main control module, thereby realizing remote monitoring of the system's operating status. For example, the monitoring platform can view the impedance information, current information, and whether the system has malfunctioned in real time, gaining a comprehensive understanding of the system's operating status. This not only facilitates system maintenance and management but also allows for timely notification of the monitoring platform in case of abnormalities, enabling appropriate measures to be taken, improving the system's maintainability and emergency response capabilities, and ensuring stable system operation.
[0067] The above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit it. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure.
Claims
1. A parallel current sharing control system for multiple chopper circuits, characterized in that, include: Multiple chopper modules; The multiple chopper modules are connected in parallel; Any of the chopper modules includes: a chopper circuit, a switch selection module, an impedance detection module, a current control module, and a main control module; The input terminal of the chopper circuit is connected to a DC power supply, the control terminal of the chopper circuit is connected to the main control module, the output terminal of the chopper circuit is connected to the input terminal of the switch selection module, the first output terminal of the switch selection module is connected to the input terminal of the current control module, the second output terminal of the switch selection module is connected to the first terminal of the impedance detection module, and the control terminal of the switch selection module is connected to the main control module. The output terminal of the current control module is used to connect to the electrical equipment, and the control terminal of the current control module is connected to the main control module. The second end of the impedance detection module is used to connect to the electrical equipment, and the control end of the impedance detection module is connected to the main control module.
2. The parallel current sharing control system for multiple chopper circuits as described in claim 1, characterized in that, The impedance detection module includes: an impedance matching unit and an impedance detection unit; The first end of the impedance matching unit is connected to the second output end of the switch selection module, the second end of the impedance matching unit is connected to the electrical equipment, and the control end of the impedance matching unit is connected to the main control module. The first end of the impedance detection module is connected to the electrical equipment, and the second end of the impedance detection unit is connected to the main control module.
3. The parallel current sharing control system for multiple chopper circuits as described in claim 2, characterized in that, The impedance matching unit includes resistor R1, resistor R2, and digital potentiometer U1; The first end of resistor R1 is connected to the second output terminal of the switch selection module, the first end of resistor R2 is connected to the first end of resistor R2, the second end of resistor R1 is connected to the output terminal of digital potentiometer U1, the high end of digital potentiometer U1 is connected to VCC power supply, the low end of digital potentiometer U1 is grounded, the power supply terminal of digital potentiometer U1 is connected to VCC power supply, and the communication terminal of digital potentiometer U1 is connected to the main control module. The second end of the resistor R2 is grounded through the resistor RX, where the resistor RX is the equivalent resistance of the electrical equipment, and the second end of the resistor R2 is connected to the impedance detection unit.
4. The parallel current sharing control system for multiple chopper circuits as described in claim 3, characterized in that, The impedance detection unit includes: a rheostat RP1, a capacitor C1, and a Zener diode U2; The first end of the variable resistor RP1 is connected to the second end of the resistor R2. The second end of the variable resistor RP1 is grounded. The sliding end of the variable resistor RP1 is connected to the main control module. The sliding end of the variable resistor RP1 is grounded through the capacitor C1. The sliding end of the variable resistor RP1 is connected to the cathode of the Zener diode U2. The anode of the Zener diode U2 is grounded.
5. The parallel current sharing control system for multiple chopper circuits as described in claim 3, characterized in that, The impedance matching unit further includes: a switching transistor Q2; The first terminal of the switching transistor Q2 is connected to the VCC power supply, the second terminal of the switching transistor Q2 is grounded, and the control terminal of the switching transistor Q2 is connected to the main control module.
6. The parallel current sharing control system for multiple chopper circuits as described in claim 1, characterized in that, The switch selection module includes: a relay K1 and a switching transistor Q1; The control terminal of the switching transistor Q1 is connected to the main control module. The first terminal of the switching transistor Q1 is connected to the first terminal of the relay K1. The second terminal of the switching transistor Q1 is grounded. The second terminal of the relay K1 is connected to the VDD power supply. The third terminal of the relay K1 is connected to the DC power supply. The fourth terminal of the relay K1 is connected to the input terminal of the current control module. The fifth terminal of the relay K1 is connected to the first terminal of the impedance detection module.
7. The parallel current sharing control system for multiple chopper circuits as described in claim 1, characterized in that, Also includes: Fault detection module; The input terminal of the fault detection module is connected to the detection terminal of the current control module, and the output terminal of the fault detection module is connected to the main control module.
8. The parallel current sharing control system for multiple chopper circuits as described in claim 1, characterized in that, Also includes: Wireless communication module; The main control module communicates with the monitoring platform through the wireless communication module.