DC biasing digital inhibition system and method based on bidirectional full-bridge converter

Abstract

The invention discloses a DC biasing digital inhibition system and method based on a bidirectional full-bridge converter. A power phase shift angle is removed from a traditional phase shift control algorithm, a new control variable is introduced, the control variable is the modulation phase shift angle of an advance arm and a lagging arm of a bridge B1, the control variable is introduced to realize a ZVS soft switch in the given power range, and in the working process of the converter, the control variable changes with change of the phase shift angle. Due to the fact that stray parameters of a switch tube and a parasitic capacitor cannot be absolutely consistent in four switch tubes and a winding technology of a transformer has problems, biasing in the transformer cannot be avoided, and biasing inhibition is a necessary function of the full-ridge converter.

Description

technical field [0001] The invention relates to a DC bias digital suppression system and method based on a bidirectional full-bridge converter. Background technique [0002] In bridge isolated converters, DC bias suppression is indispensable. The traditional DC bias suppression method for high-frequency transformers includes connecting DC blocking capacitors in series and adopting peak current mode control. Due to the particularity of the bidirectional full-bridge converter, it is not easy to use the peak current mode in this converter; and the series connection of DC blocking capacitors is often based on empirical formulas, so that the capacitor voltage drop is kept at about 10% of the input voltage to select the capacitor capacity, but this method will still cause certain difficulties in the actual debugging process. In the working process, the capacitor itself also introduces a high loss. Since the capacitor is connected in series, the quality of the capacitor is also re...

AI Technical Summary

Problems solved by technology

Due to the particularity of the bidirectional full-bridge converter, it is not easy to use the peak current mode in this converter; and the series connection of DC blocking capacitors is often based on empirical formulas, so that the capacitor voltage drop is kept at about 10% of the input voltage to select the capacitor capacity, but this method will still cause certain difficulties in the actual debugging process. In the working process, the capacitor itself also introduces a high loss. Since the capacitor is connected in series, the quality of the capacitor is also related to the quality of the product. reliability

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