A Parallel Current Sharing Control Method of High Frequency Switching Power Supply Based on Average Current Feedforward

Abstract

The invention relates to a high-frequency switch power supply parallel current-sharing control method based on average current feedforward. The method is characterized in that based on voltage-loop control Gu (s), the average output current feedforward Gav(s) and the voltage loop control output signal iref* are combined to generate a current reference signal iref, and the current reference signaliref is transmitted to current control Gi(s); and based on the average output current feedforward Gav(s), the current-sharing difference value Delta i and a current-sharing virtual impedance are introduced, the manner of the current-sharing virtual impedance G Delta (s) and the minimum value G Delta min (s) are calculated and controlled according to the output electric energy requirement. The average current feedforward is introduced, the influence of the module individual difference on the output current can be reduced, and the influence of the software and hardware parameter difference of the module individuals on the parallel voltage and current is reduced; and meanwhile, on the basis of average current feedforward, the current-sharing difference value control of the virtual impedance is adopted, so that the non-uniform current of the parallel switch power supply system is reduced, and the output electric energy quality meets the requirements.

Description

technical field [0001] The invention belongs to the technical field of high-frequency switching power supply parallel current sharing control, in particular to a high-frequency switching power supply parallel current sharing control method based on average current feedforward. Background technique [0002] In military equipment, power system, industrial equipment, post and telecommunications and other industries, high-power high-frequency switching power supply is widely used, which is directly related to the stability, reliability and output performance of the power supply system. High-frequency switching power supplies usually use high-power semiconductor devices as switching elements, mainly to achieve the goals of power factor correction, stable output voltage, and fast and precise output current control, as well as functions such as electromagnetic interference suppression and harmonic control. By using technologies such as parallel connection or multi-phase parallel co...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, provide a high-frequency switching power supply parallel current sharing control method based on average current feedforward, and solve the problem of applying the existing method to the time-average current flow and load adjustment of the high-frequency switching power supply parallel system conflict between rates

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