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CN-121979351-A - Control method of multi-output branch power supply and related equipment

CN121979351ACN 121979351 ACN121979351 ACN 121979351ACN-121979351-A

Abstract

The application discloses a control method and related equipment of a multi-output branch power supply, wherein the method comprises the steps of calculating a voltage control loop output value according to an output voltage sampling value and a reference voltage, calculating a feedback current limiting value according to a current sampling value of each output branch, a branch maximum current limiting value corresponding to each output branch and a total output current sampling value, determining a reference current according to a maximum total output current limiting value, a voltage control loop output value and the feedback current limiting value, calculating a current control loop output value according to the reference current and the total output current sampling value, and further adjusting the output voltage of the voltage source type power supply. The embodiment of the application can perform comprehensive current limiting control on the maximum total output current and each output branch current while ensuring stable output voltage through cooperative control of the voltage control loop and the current control loop. The application can be widely applied to the technical field of power supply control.

Inventors

  • CHEN WEN

Assignees

  • 广州鼎汉轨道交通装备有限公司

Dates

Publication Date
20260505
Application Date
20251231

Claims (10)

  1. 1. A method for controlling a multiple output branch power supply, comprising: acquiring an output voltage sampling value, a current sampling value of each output branch and a total output current sampling value of a voltage source type power supply; calculating a voltage control loop output value according to the output voltage sampling value and a preset reference voltage; Calculating a feedback current limit value according to the current sampling value of each output branch, the branch maximum current limit value corresponding to each output branch and the total output current sampling value; Determining a reference current according to a preset maximum total output current limit value, the voltage control loop output value and the feedback current limit value; Calculating a current control loop output value according to the reference current and the total output current sampling value; And adjusting the output voltage of the voltage source type power supply according to the output value of the current control loop.
  2. 2. The method according to claim 1, wherein calculating the output value of the voltage control loop according to the output voltage sampling value and a preset reference voltage comprises: Calculating a difference between the output voltage sampling value and the reference voltage; And inputting the difference value between the output voltage sampling value and the reference voltage into a preset first discretization proportional-integral controller for operation to obtain the output value of the voltage control loop.
  3. 3. The method according to claim 1, wherein calculating the feedback current limit value according to the current sampling value of each output branch, the branch maximum current limit value corresponding to each output branch, and the total output current sampling value comprises: Calculating branch current limit values according to the current sampling values of the output branches and the branch maximum current limit values corresponding to the output branches; And taking the sum of the branch current limit value and the total output current sampling value as the feedback current limit value.
  4. 4. A control method of a multiple output branch power supply according to claim 3, wherein said calculating a branch current limit value based on the current sampling value of each output branch and the branch maximum current limit value corresponding to each output branch comprises: Respectively calculating the difference value between the branch maximum current limit value corresponding to each output branch and the current sampling value of each output branch to obtain a plurality of candidate branch current limit values; and selecting the smallest candidate branch current limit value as the branch current limit value.
  5. 5. The method according to claim 1, wherein determining the reference current according to the preset maximum total output current limit value, the voltage control loop output value, and the feedback current limit value comprises: And selecting the minimum value of the maximum total output current limit value, the voltage control loop output value and the feedback current limit value as the reference current.
  6. 6. The method of claim 1, wherein calculating the current control loop output value from the reference current and the total output current sample value comprises: calculating a difference between the reference current and the total output current sample value; and inputting the difference value between the reference current and the total output current sampling value into a preset second discretization proportional-integral controller for operation to obtain the output value of the current control loop.
  7. 7. The method according to claim 1, wherein the adjusting the output voltage of the voltage source type power supply according to the output value of the current control loop comprises: generating a control signal according to the current control loop output value; And controlling the power switch device of the voltage source type power supply according to the control signal.
  8. 8. A control device for a multiple output branch power supply, the device comprising: the data sampling module is used for acquiring an output voltage sampling value, a current sampling value of each output branch and a total output current sampling value of the voltage source type power supply; The voltage control loop output value calculation module is used for calculating a voltage control loop output value according to the output voltage sampling value and a preset reference voltage; The feedback current limit value calculation module is used for calculating a feedback current limit value according to the current sampling value of each output branch, the branch maximum current limit value corresponding to each output branch and the total output current sampling value; The reference current acquisition module is used for determining a reference current according to a preset maximum total output current limit value, the voltage control loop output value and the feedback current limit value; The current control loop output value calculation module is used for calculating a current control loop output value according to the reference current and the total output current sampling value; and the output voltage adjusting module is used for adjusting the output voltage of the voltage source type power supply according to the output value of the current control loop.
  9. 9. An electronic device comprising a memory storing a computer program and a processor implementing the method of any of claims 1 to 7 when the computer program is executed by the processor.
  10. 10. A computer program product comprising a computer program, characterized in that the computer program, when executed by a processor, implements the method of any one of claims 1 to 7.

Description

Control method of multi-output branch power supply and related equipment Technical Field The application relates to the technical field of power supply control, in particular to a control method of a multi-output branch power supply and related equipment. Background Along with the continuous improvement of the power supply precision requirement of the electric equipment on the voltage type power supply, the single-path power supply is often required to supply power to different loads through a plurality of output branches, and the maximum current limited by the loads at the different branches is often different. The existing multi-output branch power supply generally adopts independent voltage rings and current rings to control output voltage or output current, the voltage rings or the current rings are switched under the condition that the output voltage or the current meets a certain condition, the output voltage and the current are easy to be unstable and discontinuous when the voltage rings/the current rings are switched, the maximum value of the total output current can be limited, and the maximum output current of a branch cannot be limited. In summary, the technical problems in the related art are to be improved. Disclosure of Invention The embodiment of the application mainly aims to provide a control method of a multi-output branch power supply and related equipment, which are used for carrying out comprehensive current limiting control on the maximum total output current and each output branch current while ensuring stable output voltage through cooperative control of a voltage control loop and a current control loop, avoiding unstable output caused by switching of a voltage ring and a current ring and preventing single branch overcurrent. In order to achieve the above object, an aspect of an embodiment of the present application provides a method for controlling a multiple output branch power supply, where the method includes: acquiring an output voltage sampling value, a current sampling value of each output branch and a total output current sampling value of a voltage source type power supply; calculating a voltage control loop output value according to the output voltage sampling value and a preset reference voltage; Calculating a feedback current limit value according to the current sampling value of each output branch, the branch maximum current limit value corresponding to each output branch and the total output current sampling value; Determining a reference current according to a preset maximum total output current limit value, the voltage control loop output value and the feedback current limit value; Calculating a current control loop output value according to the reference current and the total output current sampling value; And adjusting the output voltage of the voltage source type power supply according to the output value of the current control loop. In some embodiments, the calculating the output value of the voltage control loop according to the output voltage sampling value and a preset reference voltage includes: Calculating a difference between the output voltage sampling value and the reference voltage; And inputting the difference value between the output voltage sampling value and the reference voltage into a preset first discretization proportional-integral controller for operation to obtain the output value of the voltage control loop. In some embodiments, the calculating the feedback current limit value according to the current sampling value of each output branch, the branch maximum current limit value corresponding to each output branch, and the total output current sampling value includes: Calculating branch current limit values according to the current sampling values of the output branches and the branch maximum current limit values corresponding to the output branches; And taking the sum of the branch current limit value and the total output current sampling value as the feedback current limit value. In some embodiments, the calculating a branch current limit value according to the current sampling value of each output branch and the branch maximum current limit value corresponding to each output branch includes: Respectively calculating the difference value between the branch maximum current limit value corresponding to each output branch and the current sampling value of each output branch to obtain a plurality of candidate branch current limit values; and selecting the smallest candidate branch current limit value as the branch current limit value. In some embodiments, the determining the reference current according to the preset maximum total output current limit, the voltage control loop output value, and the feedback current limit includes: And selecting the minimum value of the maximum total output current limit value, the voltage control loop output value and the feedback current limit value as the reference current. In some embodiments, said calculating a