Isolated bidirectional resonance soft switching DC-DC converter

Abstract

The invention discloses an isolated bidirectional resonance soft switching DC-DC converter. A topological structure of the isolated bidirectional resonance soft switching DC-DC converter comprises twoactive bridges and a resonant cavity, the converter is simple in topological structure and is convenient to realize magnetic integration, thereby having the potential of realizing the high power density. Meanwhile, the converter can realize the wide-range flexible adjustment of the bidirectional voltage gain by means of a simple frequency conversion control mode, so that the reliability is enhanced. In addition, the converter can realize the zero-voltage switching-on (ZVS) of an inverter switching tube and the zero-current switching-off (ZCS) of a rectifier switching tube in a very wide range, so that the switching loss is greatly reduced. The converter can be applied to various occasions needing bidirectional power flow, such as an energy storage system, a storage battery charging and discharging controller in an electric automobile, a switching power supply, etc.

Description

technical field [0001] The invention relates to the technical field of bidirectional DC-DC converters, in particular to an isolated bidirectional resonant soft-switching DC-DC converter. Background technique [0002] With the rapid consumption of traditional fossil energy (such as oil, coal, natural gas, etc.) and the aggravation of environmental pollution, the rational and effective use of energy has attracted people's attention. Renewable energy has attracted extensive attention due to its advantages of sustainable use and cleanliness. For renewable energy, systems such as solar photovoltaic power generation, wind power generation and fuel cell power have received more and more attention. Although some fruitful results have been achieved, due to the inherent intermittent and violent nature of renewable energy The volatility of the global economy means that many challenges still need to be solved. In order to suppress voltage fluctuations and improve the utilization rate ...

AI Technical Summary

Problems solved by technology

However, the traditional LLC-type converter is limited in bidirectional power transfer applications due to the poor consistency of voltage gain curves in forward and reverse modes.

Although some scholars have proposed some solutions to the problem of poor LLC inverse gain characteristics from the perspective of control strategy, the control strategy is often more complicated, and often requires an additional circuit structure to realize the voltage doubling function, so it will affect the reliability of the converter. Certain adverse effects on performance and power density

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