A voltage-stabilized multi-rectifier current sharing control system

Abstract

This utility model discloses a voltage-stabilized multi-rectifier current sharing control system, relating to the field of multi-rectifier current sharing control technology. It includes a controller, a main rectifier, and multiple slave rectifiers. The controller module comprises a current sharing control module, a voltage regulation control module, a communication module, and a power supply module. The controller is connected to the main rectifier and multiple slave rectifiers via the communication module. It centrally controls 1+N rectifiers and achieves current sharing control. The rectifiers are miniaturized, allowing for flexible increases in the number of units and facilitating on-site planning. The rectifiers operate at optimal power, improving average power consumption and efficiency. In the event of a single rectifier failure, the system automatically distributes current to ensure the continuity of electroplating production.

Description

Technical Field

[0001] This utility model relates to the field of current sharing control technology for multiple rectifiers, and in particular to a current sharing control system for voltage-stabilized multiple rectifiers. Background Technology

[0002] In high-current applications (such as electroplating, electrolysis, and battery charging), multiple rectifiers are typically required to operate in parallel to meet load demands. However, due to differences in rectifier performance parameters and uneven load distribution, uneven current distribution and voltage fluctuations can easily occur when multiple rectifiers operate in parallel. Existing technical solutions suffer from drawbacks such as low control precision, slow dynamic response, and insufficient system stability.

[0003] High-power electroplating rectifiers often use parallel combination of unit rectifier modules, with the total current evenly distributed among the unit modules. This distribution method is currently limited to constant current mode. In constant voltage mode, the output current of each unit cannot be kept consistent, meaning that current sharing is not yet achieved in constant voltage mode.

[0004] In the voltage regulation mode, current sharing cannot be achieved, which means that in many voltage regulation electroplating states, multiple rectifiers can only be controlled independently, or a single high-power unit can be used to complete the electroplating work.

[0005] Single-unit high-power mode: The copper busbar design of the plating tank is calculated based on the total current. The copper busbar has a large cross-sectional area and requires a large investment. In addition, the rectifier design is large. The actual electroplating energy conversion efficiency is low and the loss is serious.

[0006] Multiple stand-alone mode: When adjusting the current, each machine needs to be adjusted one by one. Due to human factors, not all machines are adjusted, which leads to quality accidents in many electroplated workpieces. Utility Model Content

[0007] The purpose of this invention is to provide a simple, highly accurate, and dynamically responsive voltage-stabilized multi-rectifier current sharing control system that addresses the shortcomings and deficiencies of existing technologies, thereby solving the problems of current sharing and voltage stabilization when multiple rectifiers are operating in parallel.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A voltage-stabilized multi-rectifier current sharing control system includes a controller, a main rectifier, and multiple slave rectifiers. The controller includes a current sharing control module, a voltage regulation control module, a communication module, and a power supply module. The controller is connected to the main rectifier and the multiple slave rectifiers respectively through the communication module.

[0010] The voltage regulation control module is connected to the main rectifier and is used to monitor the output voltage of the main rectifier and maintain the system voltage stability by adjusting the output voltage of the main rectifier.

[0011] The current sharing control module is connected to the main rectifier and multiple slave rectifiers respectively, and is used to detect the output current of each rectifier in real time and achieve current balance by adjusting the output of each rectifier;

[0012] The power module is connected to the current sharing control module, the voltage regulation control module, and the communication module respectively, and is used to provide the required electrical energy.

[0013] As a further preferred embodiment of the current sharing control system for a multi-rectifier voltage regulator of this utility model, the controller CPU used in the communication module is an NXP LPC2138.

[0014] The voltage regulation control module includes a linear regulator, a switching regulator, and a differential voltage regulator;

[0015] Among them, the linear regulator is used to maintain the stability of the output voltage by adjusting the internal resistance;

[0016] Switching regulators are used to regulate output voltage through rapid switching.

[0017] Differential voltage regulator: Used to maintain stability when the input voltage is close to the output voltage.

[0018] As a further preferred embodiment of the current sharing control system for a multi-rectifier voltage regulator of this utility model, the power supply module includes a voltage source and an overcurrent protection circuit connected thereto. The overcurrent protection circuit includes resistors R73, R83, R84, R85, R120, R121, R123, R172, R86, R187, capacitors C25 and C31, a rectifier B1, a transformer T1, and an operational amplifier. One end of resistor R86 is connected to one end of resistor R187 and one end of resistor R172, the other end of resistor R172 is grounded, and the other end of resistor R187 is connected to pin 5 of the operational amplifier. Pin 7 of the operational amplifier is connected to pin 6 of the operational amplifier and one end of resistor R83. The other end of resistor R83 is connected to one end of capacitor C25 and one end of resistor R86. The other end of capacitor C25 is grounded. The other end of resistor R86 is connected to one end of resistor R85 and one end of resistor R84. The other end of resistor R85 is connected to the 3.25V voltage terminal. The other end of resistor R84 is connected to one end of resistor R73, one end of capacitor C31, one end of resistor R123, and one end of resistor R120. The other end of capacitor C31 is connected to the other end of resistor R123, one end of resistor R121, and pin 3 of rectifier B1. The other end of resistor R120 is connected to the other end of resistor R121 and pin 1 of rectifier B1. Pin 2 of rectifier B1 is connected to pin 2 of transformer. Pin 1 of transformer is connected to pin 4 of rectifier B1.

[0019] Compared with the prior art, the present invention, by adopting the above technical solution, has the following technical effects:

[0020] 1. This utility model discloses a voltage-stabilized multi-rectifier current sharing control system, comprising a controller, a main rectifier, and multiple slave rectifiers. The controller module includes a current sharing control module, a voltage regulation control module, a communication module, and a power supply module. The controller is connected to the main rectifier and multiple slave rectifiers via the communication module. The voltage regulation control module detects the system output voltage, calculates the voltage deviation, generates a control signal, and dynamically adjusts the rectifier output to ensure system voltage stability. The current sharing control module detects the output current of each rectifier, calculates the current deviation, generates a current sharing signal, and dynamically adjusts the output of each rectifier to achieve current balance. The communication module ensures real-time data exchange between each rectifier and the controller, realizing coordinated system control and effectively solving the current sharing and voltage regulation problems when multiple rectifiers are operating in parallel.

[0021] 2. In voltage regulation mode, this utility model centrally controls 1+N rectifiers and achieves current sharing control; the rectifiers are miniaturized, and the number of units can be flexibly increased, which is convenient for on-site planning; the rectifiers operate at optimal power, and the average power consumption and efficiency are improved; if a single rectifier fails, the system automatically distributes the current to ensure the continuity of electroplating production; the positive copper busbar only bears the current of a single unit, and the cross-sectional area of ​​the copper busbar can be greatly reduced, thereby reducing investment costs. Attached Figure Description

[0022] The accompanying drawings, which are provided to further illustrate the present invention and form part of this application, do not constitute an undue limitation of the present invention. In the drawings:

[0023] Figure 1 This is a schematic diagram of the structural principle of a voltage-stabilized multi-rectifier current sharing control system according to this utility model;

[0024] Figure 2 This is a schematic diagram of the multi-machine central control mode of this utility model;

[0025] Figure 3 This is a circuit diagram of the low-voltage, low-current protection circuit of this utility model. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The illustrative embodiments and descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0027] The technical solutions of the present utility model 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 the present utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0028] Multi-machine control logic 1+N: The host (1) automatically calculates the current according to the load size in voltage regulation mode and assigns the host current value as "total current / (1+N)";

[0029] Multiple slave devices (N) in constant current mode replicate the master current for current assignment;

[0030] The system control software locks the host based on the address code of each rectifier. When the host fails, the program automatically replaces the host, recalculates the current, and assigns the value to the new host.

[0031] When a slave unit fails, the number of rectifiers operating normally is automatically calculated and reassigned to the master unit based on "total current / (1+N)".

[0032] A voltage-stabilized multi-rectifier current sharing control system, such as Figure 1 As shown, the system includes a controller, a main rectifier, and multiple slave rectifiers. The controller module includes a current sharing control module, a voltage regulation control module, a communication module, and a power supply module. The controller is connected to the main rectifier and the multiple slave rectifiers through the communication module.

[0033] The voltage regulation control module is connected to the main rectifier and is used to monitor the output voltage of the main rectifier and maintain the system voltage stability by adjusting the output voltage of the main rectifier.

[0034] The current sharing control module is connected to the main rectifier and multiple slave rectifiers respectively, and is used to detect the output current of each rectifier in real time and achieve current balance by adjusting the output of each rectifier;

[0035] The power module is connected to the current sharing control module, the voltage regulation control module, and the communication module respectively, and is used to provide the required electrical energy.

[0036] The controller CPU used in the communication module is an NXP LPC2138. The communication section also includes other communication modules, including: a 485 communication module, a 232 communication module, and an electromagnetic relay.

[0037] The voltage regulation control module includes a linear regulator, a switching regulator, and a differential voltage regulator;

[0038] Among them, the linear regulator is used to maintain the stability of the output voltage by adjusting the internal resistance;

[0039] Switching regulators are used to regulate output voltage through rapid switching.

[0040] Differential voltage regulator: Used to maintain stability when the input voltage is close to the output voltage.

[0041] The power supply module includes a voltage source and an overcurrent protection circuit connected thereto. The overcurrent protection circuit includes resistors R73, R83, R84, R85, R120, R121, R123, R172, R86, R187, capacitors C25 and C31, a rectifier B1, a transformer T1, and an operational amplifier. One end of resistor R86 is connected to one end of resistor R187 and one end of resistor R172. The other end of resistor R172 is grounded. The other end of resistor R187 is connected to pin 5 of the operational amplifier. Pin 7 of the operational amplifier is connected to pin 6 of the operational amplifier and one end of resistor R83. The other end of resistor R83 is connected to... One end of capacitor C25 is connected to one end of resistor R86. The other end of capacitor C25 is grounded. The other end of resistor R86 is connected to one end of resistor R85 and one end of resistor R84. The other end of resistor R85 is connected to the 3.25V voltage terminal. The other end of resistor R84 is connected to one end of resistor R73, one end of capacitor C31, one end of resistor R123, and one end of resistor R120. The other end of capacitor C31 is connected to the other end of resistor R123, one end of resistor R121, and pin 3 of rectifier B1. The other end of resistor R120 is connected to the other end of resistor R121 and pin 1 of rectifier B1. Pin 2 of rectifier B1 is connected to pin 2 of transformer. Pin 1 of transformer is connected to pin 4 of rectifier B1.

[0042] The specific principle is as follows: The step-up current in the transformer is taken from the T1 coil. The magnitude of this current is 1 / n. After rectification by B1, the resulting DC current is divided by R120-R123, and this divided voltage represents the magnitude of the current in the rectifier transformer. The subsequent circuit sends a portion of this divided voltage to the full-bridge rectifier controller, using this voltage as the current value for software control. The other portion is connected to a pulse comparator. If the voltage comparison value exceeds a threshold, it is considered an overcurrent, and the rectifier is shut down.

[0043] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

[0044] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0045] The above embodiments are merely illustrative of the technical concept of this utility model and should not be construed as limiting the scope of protection of this utility model. Any modifications made to the technical solution based on the technical concept proposed in this utility model shall fall within the scope of protection of this utility model. The implementation methods of this utility model have been described in detail above, but this utility model is not limited to the above-described implementation methods. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this utility model.

Claims

1. A voltage-stabilized multi-rectifier current sharing control system, characterized in that: It includes a controller, a main rectifier, and multiple slave rectifiers. The controller includes a current sharing control module, a voltage regulation control module, a communication module, and a power supply module. The controller is connected to the main rectifier and multiple slave rectifiers through the communication module. The voltage regulation control module is connected to the main rectifier and is used to monitor the output voltage of the main rectifier and maintain the system voltage stability by adjusting the output voltage of the main rectifier. The current sharing control module is connected to the main rectifier and multiple slave rectifiers respectively, and is used to detect the output current of each rectifier in real time and achieve current balance by adjusting the output of each rectifier; The power module is connected to the current sharing control module, the voltage regulation control module, and the communication module respectively, and is used to provide the required electrical energy.

2. The voltage-stabilized multi-rectifier current sharing control system according to claim 1, characterized in that: The communication module uses an NXP LPC2138 CPU as its controller.

3. The current sharing control system for multiple rectifiers with voltage regulation according to claim 1, characterized in that: The voltage regulation control module includes a linear regulator, a switching regulator, and a differential voltage regulator; Among them, the linear regulator is used to maintain the stability of the output voltage by adjusting the internal resistance; Switching regulators are used to regulate output voltage through rapid switching. Differential voltage regulator: Used to maintain stability when the input voltage is close to the output voltage.

4. The voltage-stabilized multi-rectifier current sharing control system according to claim 1, characterized in that: The power supply module includes a voltage source and an overcurrent protection circuit connected thereto. The overcurrent protection circuit includes resistors R73, R83, R84, R85, R120, R121, R123, R172, R86, R187, capacitors C25 and C31, a rectifier B1, a transformer T1, and an operational amplifier. One end of resistor R86 is connected to one end of resistor R187 and one end of resistor R172. The other end of resistor R172 is grounded. The other end of resistor R187 is connected to pin 5 of the operational amplifier. Pin 7 of the operational amplifier is connected to pin 6 of the operational amplifier and one end of resistor R83. The other end of resistor R83 is connected to... One end of capacitor C25 is connected to one end of resistor R86. The other end of capacitor C25 is grounded. The other end of resistor R86 is connected to one end of resistor R85 and one end of resistor R84. The other end of resistor R85 is connected to the 3.25V voltage terminal. The other end of resistor R84 is connected to one end of resistor R73, one end of capacitor C31, one end of resistor R123, and one end of resistor R120. The other end of capacitor C31 is connected to the other end of resistor R123, one end of resistor R121, and pin 3 of rectifier B1. The other end of resistor R120 is connected to the other end of resistor R121 and pin 1 of rectifier B1. Pin 2 of rectifier B1 is connected to pin 2 of transformer. Pin 1 of transformer is connected to pin 4 of rectifier B1.

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