Control method for full-load input voltage equalizing of input-series-output-parallel combination converter

Abstract

The invention relates to a control method for sharing voltage when inputting full load of an input-series-output-parallel combined converter. A sinusoidal modulation signal with a phase difference of Pi / n is increased on basis of the output signal vo_EA of a sharing output voltage regulator and the output signal vcd_EAi of each module input voltage-sharing regulator included in the drive signals of each input-series-output-parallel topology module control terminal. The increased sinusoidal modulation signal together with the signals vo_EA and vcd_EAi as a new error signal of each circuit is intersected with sawtooth waves VRAMPi inside a control chip to obtain a drive signal of each topology module switching tube, thereby controlling the ordered turn on and off of each topology module switching tube. The introduction of sinusoid with certain amplitude phase difference can obviously improve the problems that the duty cycle regulation space of some converter is lost and the problems caused by thereof when no-load or light-load. The control method of the invention has reasonable design, realizes the purposes of voltage-sharing and current-sharing under full load condition and is a control method with good stability and high reliability.

Description

technical field [0001] The invention relates to a control method for input voltage equalization of an input series output parallel combined converter, in particular to a control method for input voltage equalization of the converter within the full load range, which belongs to the field of DC voltage conversion. Background technique [0002] With the development of modern power electronics technology and the birth of high-frequency switching devices, switching power supplies are developing in the direction of high frequency, integration and modularization. As one of the series-parallel technologies of standard modules, the combination converter of input series output parallel (hereinafter referred to as ISOP) has the advantages of short development cycle and low system cost brought by standard modularization, and has become a research hotspot in recent years. It is suitable for occasions with high input voltage and high output power in industrial production and power system ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is mainly to address the shortcomings of the above-mentioned existing ISOP combined converters that cannot realize voltage and current equalization under no-load or light-load conditions, and to provide a method that can also achieve voltage equalization under no-load or light-load conditions. Control method for full-load input voltage equalization of input series output parallel combination converter with current sharing and normal operation

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