Quantity configuration control method and device for improving efficiency of two-stage multi-module converter

Abstract

The invention discloses a quantity configuration control method and device for improving the efficiency of a two-stage multi-module converter, and the method comprises the steps that a plurality of same LLC power modules are employed at a preceding stage to boost an input voltage to a fixed value and enable an output side to be connected in series, and a multi-input single-output BUCK power moduleis employed at a back stage; the preceding stage output voltage is sent to a backward-stage BUCK circuit to serve as an input voltage to form a main circuit, all LLC output voltages are direct-current voltages with the same value and are connected in series to form an intermediate bus voltage, the value of the intermediate bus voltage is larger than that of the backward-stage output voltage, andthe backward-stage output voltage and the output power are calculated; an upper computer transmits an instruction to the post-stage power supply module through CAN bus communication, and a post-stagepower supply module performs parameter configuration and controls the start-stop state of the pre-stage and the working duty ratio of the post-stage, so that the working number of the power supply modules of the pre-stage LLC is reduced, the output power of the working modules is increased, and the efficiency of the whole machine is improved.

Description

Technical field[0001]The technical field of power electronics of the present invention particularly relates to a method and device for controlling the number of modules for improving the efficiency of a two-level structure high-power power supply based on multi-module cascade.Background technique[0002]In various power electronic equipment, high-frequency switching power supply plays an important role as a power supply system. With the continuous development of science and technology, more stringent requirements have been put forward on the volume, reliability, efficiency, and capacity of high-frequency switching power supplies, which has also made the technology of high-frequency switching power supplies continue to move toward high-frequency, integration, and intelligence. Direction innovation and development. Therefore, research on high-efficiency and high-reliability rectifier power supplies is of great significance to industrial production. Modular equipment has the advantages o...

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Problems solved by technology

[0005] In order to solve the above-mentioned defects existing in the prior art, the purpose of the present invention is to solve the problem of low efficiency of multi-module cascaded power supply in low power output and low voltage output, and propose a method to improve the efficiency of two-stage multi-module converter Configuration control method

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