Constant gain bidirectional DC-DC resonant converter and control method thereof

A DC-DC, resonant converter technology, used in control/regulation systems, DC power input conversion to DC power output, instruments, etc., can solve the problems of circulating current loss, low transmission efficiency, low output efficiency, etc. The effect of small circulating current loss and improving transmission efficiency
CN110190751AActive Publication Date: 2019-08-30CENT SOUTH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CENT SOUTH UNIV
Publication Date
2019-08-30

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Abstract

The invention discloses a constant gain bidirectional DC-DC resonant converter and a control method thereof. Both sides of a transformer of the resonant converter are identical in circuit structure and include a port, two resonant capacitors and anti-parallel auxiliary diodes thereof, a resonant inductor, an auxiliary inductor and two power switch tubes. The constant gain bidirectional DC-DC resonant converter disclosed by the invention is symmetrical in circuit structure and consistent in forward and reverse working performance. Under the control method designed by the invention, the zero voltage switching (ZVS) of all power switch tubes can be well achieved with the help of the auxiliary inductor, and the circulating current loss of the converter is reduced. Meanwhile, the constant voltage gain within the range from rated load to no load is realized at the same time, thereby being capable of playing a role of power limiting in the case of overload with the help of the auxiliary diodes. The natural bidirectional flow of energy in forward and reverse operation modes is realized, and the transmission efficiency and reliability of the converter are improved.
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Description

technical field

[0001] The invention belongs to the technical field of switching power supplies in the field of power electronics, and specifically relates to a constant-gain bidirectional DC-DC resonant converter, especially an LC series resonant converter, and a fixed-frequency synchronous equal-width converter for controlling the converter. Control Method. Background technique

[0002] In order to alleviate the energy crisis and environmental pollution problems, the development and utilization of renewable energy have developed rapidly in recent years, such as solar energy, wind energy, tidal energy, biomass energy, etc.; however, most of the above-mentioned renewable energy such as solar photovoltaic power generation and wind power generation Energy is greatly affected by the environment and weather, and has random and intermittent characteristics. Therefore, for DC-DC converters, it needs to cope with a wide range of loads.

[0003] For DC-DC converters, high transmiss...

Claims

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