Input-parallel output-series converter based on push-pull topological structure

Abstract

The invention discloses an input-parallel output-series converter based on a push-pull topological structure. The converter comprises an external direct current voltage source, two power tubes, a push-pull topological structure booster circuit and a rectifier filter circuit. The external direct current voltage source is composed of a direct current power source and an input filter capacitor. A positive electrode of the direct current power source is connected with a positive electrode of the input filter capacitor, a negative electrode of the direct current power source is connected with a negative electrode of the input filter capacitor, and source electrodes of the first power tubes Q1 and Q2 are connected with the negative electrode of the direct current power source. The push-pull topological structure booster circuit comprises four paths of push-pull converters, dotted terminals of the primary sides of the four paths of push-pull converters are connected with a drain electrode of the power tube Q1, the heteronymous terminals of the primary sides of the four paths of push-pull converters are connected with a drain electrode of the power tube Q2, the auxiliary sides of the four paths of push-pull converters are connected with one path of rectifier filter circuit, and the output ends are connected in series. The two switching tubes are adopted for replacing multiple switching tubes, driving circuits of the switching tubes are reduced, the losses of the switching tubes are reduced, and the efficiency of the converter is improved.

Description

technical field [0001] The invention relates to a converter based on a push-pull topology with parallel input and serial output, and belongs to the technical field of power supply control. Background technique [0002] At present, the research on Buck and Buck-Boost DC conversion technology has achieved remarkable research results. Buck-type topology is essentially a step-down topology, especially used to realize the inversion of medium and large-capacity electric energy, and is widely used in various industrial occasions, such as uninterruptible power supplies; Buck-Boost topology is essentially a step-up / down-type topology The topology is only suitable for realizing the inverter of small-capacity electric energy. However, in some medium-to-high-power and high-voltage situations, the Buck and Buck-Boost topology cannot meet the requirements, especially some occasions where the voltage needs to be adjusted in a wide range while converting from low voltage to high voltage. ...

AI Technical Summary

Problems solved by technology

Since a single push-pull converter needs two PWW signals with a phase difference of 180 degrees for logic control, it will increase the difficulty of control and greatly increase the cost, which is not conducive to market promotion. In addition, due to the switching loss of the switching tube, its Its own losses will also multiply, resulting in a decrease in its efficiency

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