Single-isolation pressure increase and reduction type multi-input direct current converter

Abstract

The invention relates to a single-isolation combination pressure increase and reduction type multi-input direct current converter, wherein the circuit structure is formed by connecting one multi-input single-output high-frequency inverter circuit, a plurality of common-ground input LC filters and one common output high-frequency isolation transformation energy-storage commutation filter circuit, wherein each input end of the multi-input single-output high-frequency inverter circuit is correspondingly connected with the output end of each input LC filter and the output end of the multi-input single-output high-frequency inverter circuit is connected with the input end of the high-frequency transformer. The converter has features of input direct current power supply common-ground, no insulation between the high-frequency inverter circuits, insulation between output and input, strong voltage match capability, time-sharing power supply of multi-input power supply, simple circuit topology,common use of output high-frequency transformer and energy-storage commutation filter circuit, high power density, high conversion efficiency, small output voltage ripple, low cost and wide application foreground, as the key technique for a distribution type power supply system of various renewable energy resources.

Description

Single Isolated Step-Down Multiple Input DC Converter technical field The single-isolation step-down multi-input DC converter involved in the present invention belongs to the power electronic conversion technology. Background technique The DC converter is a static conversion device that uses power semiconductor devices to convert one DC power into another DC power for DC loads. A converter with high-frequency electrical isolation between the output DC load and the input DC power supply is called an isolated DC converter. The high-frequency electrical isolation components mainly play the following roles in the converter: 1) realize the electrical isolation between the output and input of the converter, and improve the safety reliability and electromagnetic compatibility of the converter; 2) realize the The matching between the output voltage and the input voltage realizes the technical effect that the output voltage of the converter can be higher than, equal to or lower th...

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Problems solved by technology

In order to coordinate the work of the renewable energy generation part, multiple energy sources must be connected to the common DC bus after power conversion, so multiple single-input DC converters are required to be connected in parallel at the output end, so there are complex circuit structures, Defects such as high cost

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