A DC/DC converter maximum inductor current sharing control method

Abstract

The invention relates to the technical field of power electronics, in particular to a maximum inductor current sharing control method of a DC / DC converter. The inductor current command signal output by the voltage controller of each module is sent to the analog current sharing bus through the digital-to-analog converter DAC and the maximum arbitration circuit on the control board, so that the maximum value imax of the inductor current command of each module is obtained on the current sharing bus. Then each module resamples the imax signal on the current sharing bus, and processes the sampled signal as the inductor current command signal of the inductor current inner loop of the module. Compared with the current-sharing control loop based on output current, which uses the reference value ofoutput regulated voltage of current-sharing controller to realize output current equalization between modules, the method simplifies the design of the control system, significantly improves the dynamic performance of the current sharing control, ensures the dynamic control performance of the current sharing, and improves the balance of the output current of each module in the dynamic process.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a method for controlling the maximum inductance current sharing control of a DC / DC converter. Background technique [0002] The power supply system is the heart of the power electronic system. A stable and reliable power supply system is the key to ensure the safe and reliable operation of the power electronic system. Cause circuit interruption, power electronic system paralysis, resulting in great economic and social loss. Therefore, the power electronic power supply system occupies a very important position. [0003] In the field of power electronic power supply / converter systems, the capacity of the power supply system is usually increased by using multiple modules in parallel, and the reliability of the system is improved. In the power supply system that requires fast response, such as X-ray machine power supply, welding power supply or pulse power supply system, ...

AI Technical Summary

Problems solved by technology

[0006] a. The hardware current sharing control method has high cost and unstable reliability. It is easy to cause the failure of the entire system current sharing due to a single point failure, and even cause the system output to be interrupted. The current sharing effect is greatly affected by electronic components;

[0007] b. The general software current sharing control method cannot adjust the adjustment step size in real time according to the output feedback current and voltage. If the adjustment step size is too small, the current sharing speed will be slow. flow fluctuation

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