Modulation control method of resonant dual-active bridge converter

Abstract

The invention discloses a modulation control method of a resonant dual-active bridge converter, and solves the problem that all switches of the resonant dual-active bridge converter can keep ZVS (Zero Voltage Suppressor) operation under the condition that the gain and power range of the converter are greatly changed. The method improves the zero-voltage working range and the overall efficiency of the resonant dual-active bridge converter. Therefore, for the resonant dual-active bridge converter, the invention provides a pulse width modulation strategy for expanding the ZVS (Zero Voltage Switching) range, reducing switching loss and improving the unbalance of overall efficiency.

Description

Technical field [0001] The present invention belongs to the control technology of the resonant dual active bridge converter, and details relates to a modulation control method of a resonant dual active bridge converter, and more particularly to a unbalanced pulse width modulation strategy for resonant dual active bridge converters. . Background technique [0002] High-frequency isolation resonant double active bridge converter has advantages such as uninterruptible power supplies, electric vehicles and renewable energy power generation with high power density, high reliability and simple control. However, high frequency operation may bring greater switching loss, high electromagnetic interference (EMI), thereby reducing conversion efficiency. Therefore, it is meaningful to apply softswitch techniques such as zero voltage switch (ZVS) to reduce switching losses. [0003] The resonant double active bridge converter has a wide range of zero voltage switches ZVS operating range and h...

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Problems solved by technology

[0005] In order to solve the above problems, the present invention provides a modulation control method for a resonant dual active bridge converter, which solves the problem that all switches of the resonant dual active bridge converter can be controlled under the condition that the gain and power range of the converter change greatly. The problem of maintaining ZVS operation improves the zero-voltage operating range and overall efficiency of the resonant dual active bridge converter, so for the resonant dual active bridge converter, a method is proposed to extend the ZVS range of zero voltage switching, reduce switching losses and improve the overall efficiency The unbalanced PWM strategy of the

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