A converter circuit with bidirectional synchronous rectification and dead-time self-regulation

Abstract

The invention discloses a converter circuit with bidirectional synchronous rectification and dead-zone self-regulation, which includes left and right symmetrical V1 side circuits and V2 side circuits, and the V1 side circuit includes MOS transistors Q1, MOS transistors Q2, MOS transistors Q3 and MOS transistor Q4, the V2 side circuit includes MOS transistor Q5, MOS transistor Q6, MOS transistor Q7 and MOS transistor Q8. The beneficial effects of the present invention are: 1. The invention patent, in the bidirectional DC / DC conversion, proposes how to control the bidirectional conversion state to realize the synchronous rectification technology, realize the bidirectional synchronous rectification for the LLC topology, and solve the DC / DC bidirectional The anti-backfeed problem of synchronous rectification under conversion, and the use of bidirectional synchronous rectification technology, realizes the self-adjustment of dead time well, and solves the problem that ZVS may not be realized under the limit state of LLC fixed dead time control. This not only realizes bidirectional synchronous rectification and anti-backfeeding, but also realizes dead zone adjustment, which greatly improves the efficiency and reliability of the circuit, optimizes the efficiency of LLC, and improves the EMC problem.

Description

technical field [0001] The invention relates to a converter circuit, in particular to a converter circuit with bidirectional synchronous rectification and dead zone self-regulation. Background technique [0002] The DC / DC converter is used to realize the conversion of different DC voltages. Generally, the traditional DC / DC converter is a one-way conversion and a DC / DC conversion of a non-isolated BUCK-BOOST topology. Now in order to satisfy energy storage and make full use of energy. In terms of vehicle and battery formation, DC / DC bidirectional conversion is in urgent need. Traditional non-isolated DC / DC converters have potential safety hazards due to lack of electrical isolation, so isolated DC / DC bidirectional converters have become the main research object. [0003] In the DC / DC converter, the LLC topology is the most preferred. The LLC topology can realize ZVS in almost the whole range, and the secondary side rectifier tube can realize ZCS when f<fr (resonant frequ...

AI Technical Summary

Problems solved by technology

[0010] This can only realize the DC / DC one-way conversion function, and the adjustment of the dead zone adopts DSP control, which increases the complexity of the control, especially in the case of two-way DC / DC conversion.

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