Fixed-frequency synchronous rectification bidirectional DC/DC converter and power electronic equipment applying same

Abstract

The invention relates to a fixed-frequency synchronous rectification bidirectional DC / DC converter. The converter comprises a transformer, a first power framework arranged on one side of the transformer, a second power framework arranged on the other side of the transformer, a first resonant capacitor arranged between the first power framework and the transformer, and a second resonant capacitor arranged between the transformer and the second power framework. The first / second power architecture is of a bridge structure comprising a plurality of controllable semiconductor switching devices. Theworking frequencies of the first / second frameworks used as the modulation circuit are the same and fixed, and are greater than or equal to the maximum value of the resonant frequencies of the first / second resonant capacitors and the leakage inductance resonance of the transformer. The invention further provides power electronic equipment needing bidirectional energy flow. The power electronic equipment comprises the fixed-frequency synchronous rectification bidirectional DC / DC converter. By controlling the controllable semiconductor switching devices on the two sides of the transformer, the energy conversion efficiency can be improved; energy back-filling can be avoided by setting the working frequency; and the converter and electronic equipment are simple, reliable and high in efficiency.

Description

technical field [0001] The invention belongs to the technical field of power electronic converters, and in particular relates to a fixed-frequency synchronous rectification bidirectional DC / DC converter and power electronic equipment using the same. Background technique [0002] At present, most DC converter applications only need to realize unidirectional conversion of energy, that is, the conversion of energy from high voltage to low voltage step-down, or the conversion of energy from low voltage to high voltage boost. Energy storage media can store or release energy at any time. With the rapid development of energy storage media, there is an urgent need for power electronic devices to charge and discharge energy storage media, that is, a device can realize two-way flow of energy. [0003] It can be seen that the power electronic equipment applied to the energy storage system needs to integrate two unidirectional DC converters to realize the bidirectional flow of energy, s...

AI Technical Summary

Problems solved by technology

In the case of fs<fr, the synchronous rectification device should turn off the drive before the LLC resonance ends, otherwise it will cause energy backfilling, and even the resonance error will cause the machine to explode

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