A Dual Input Forward Z-source DC Voltage Converter

Abstract

The invention discloses a dual-input normal-shock type Z-source direct-current voltage converter. The dual-input normal-shock type Z-source direct-current voltage converter comprises a first voltage source, a second voltage source, a first capacitor, a second capacitor, an inductor, a switch tube, a first diode, a second diode, a third diode, a load and a three-winding transformer, wherein the first winding of the three-winding transformer serves as a primary side, the second winding of the three-winding transformer serves as a secondary side, and the third winding of the three-winding transformer serves as a reset winding. By adopting the structure of the normal-shock converter, the converter has the advantages of the normal-shock converter and the Z-source converter, namely the converter is simple in circuit, low in cost, high in reliability and simple in drive circuit, voltage isolation on input and output sides is preferably realized, electrical insulation of equipment is facilitated, the voltage and current ripples on the output side are small, and simultaneously, relatively high voltage gain can be realized at a low duty ratio, so that dual input is realized.

Description

technical field [0001] The invention relates to the technical field of power electronic converters, in particular to a dual-input forward Z-source DC voltage converter. Background technique [0002] Facing the increasingly serious energy crisis and environmental pollution problems, it has become a top priority to find new energy sources to replace the increasingly depleted fossil energy sources. However, the output characteristics of new energy sources such as solar energy and fuel cells often do not meet the power quality requirements of existing industrial systems, and require power conversion before they can be used. [0003] On the one hand, traditional Z-source converters and quasi-Z-source converters can obtain larger output voltages at low duty cycles, overcoming the voltage and current spikes of switching tubes and diodes caused by the limit duty cycle of Boost converters. defect. However, the input and output sides of traditional Z-source DC voltage converters, qu...

AI Technical Summary

Problems solved by technology

However, the input and output sides of traditional Z-source DC voltage converters, quasi-Z-source DC voltage converters, and transformer-based Z-source DC voltage converters cannot achieve electrical isolation, which affects the safety of equipment in high-voltage gain situations. and insulation protection produce adverse impacts, reducing the life and reliability of the equipment

[0004] On the other hand, the traditional forward converter is a derivative topology of the Buck converter, which needs to rely on the increase of the turns ratio to increase the output voltage gain

At the same time, in order to prevent the excitation inductance of the transformer from saturating and ensure that the transformer can reset its magnetic core in each switching cycle, the duty cycle of the switching tube is generally less than 0.5, which will further reduce the gain of the output voltage

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