Input series connection push-pull forward converter

Abstract

The invention discloses an input series connection push-pull forward converter which belongs to the field of power electronic converters. The structure thereof comprises a direct current power supply,a first voltage-dividing capacitor, a second voltage-dividing capacitor, a first power switch tube, a second power switch tube, a magnetic reset diode, a first inductor, a second inductor, a first rectifier diode, a second rectifier diode, an output filter capacitor and a power transformer, and the main power transformer consists of two groups of primary windings (primary side) and two groups ofsecondary windings (secondary side). The primary side of the transformer consists of two forward converters in an interleaved series connection, the secondary side of the transformer is of a paralleloutput, the two forward converts use the public magnetic reset diode to complete the magnetic reset and the continuous flow of primary inductance, and the zero-voltage turning-on and turning-off of the power switch tubes can be realized through the primary inductance and parasitic capacitance of the power switch tubes. The input series conneciton push-pull forward converter has small size and highconversion efficiency and is applicable to medium-voltage and high-voltage input occasions.

Description

technical field [0001] The invention relates to a converter, in particular to an input series push-pull forward converter, which belongs to the technical field of power electronic converters. Background technique [0002] Switching power converters have significant advantages such as high efficiency, small size, and light weight, and are playing an increasingly important role in various fields of the national economy such as industrial production, aerospace, and new energy power generation. Improving the reliability, efficiency and power density of converters has always been an important topic in the field of converter research. [0003] The dual-transistor forward converter has an inherent ability to resist bridge arm shoot-through, and has high reliability, so it has been widely used in the industrial field. However, the dual-transistor forward converter needs to use a large number of switching tubes and the maximum duty cycle Can only be 0.5. Soft switching technology h...

AI Technical Summary

Problems solved by technology

Chinese patent No. 1545200A proposes a dual-circuit dual-transistor forward converter topology as the main circuit topology of the DC transformer. The number of tubes is large and the cost is high

Commonly used DC transformer topologies also include half-bridge, full-bridge and other topologies, all of which have potential dangers of bridge arms passing through

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