Novel soft-switching rectifier system

Abstract

The invention discloses a novel soft-switching rectifier system, which comprises a full-bridge converter circuit, an output rectifier and filter circuit, a PID regulating circuit and a PWM control circuit, wherein the full-bridge converter circuit comprises a power tube Q8, a power tube Q9, a power tube Q10 and a power tube Q11; the PWM control circuit comprises a two-way input square-wave generator with a phase difference of 180 degrees, a dead-time regulating circuit, a triangular wave generator trigger circuit, a ZCS and PWM regulation circuit, a full-bridge driver and a triangular wave generator. The full-bridge driver works in a soft switching mode in a load change range; a circuit topology structure of a converter is simpler than that of other ZVZCS full-bridge PWM converter circuit; and through a proper control mode or proper parameter selection, the converter can efficiently work in a soft switching mode in the wide load change range.

Description

technical field [0001] The invention relates to a rectification system, in particular to a novel soft-switching rectification system. Background technique [0002] With the rapid development of computer and communication technology, switching power supply as supporting equipment has also made great progress. For high-power switching power supplies, the existing full-bridge drive technology usually adopts a phase-shifted full-bridge method, which is realized by using an application-specific integrated circuit, an external phase-shifting transformer and a resonant network. However, due to the complex parameter adjustment and high requirements during the use of the phase-shifted full-bridge technology, usually only the ZVS of the upper half-bridge can be realized, which is a difficult point in the field of power supply design. In addition, due to the addition of a phase-shifting transformer, its loss will increase, thereby reducing the efficiency of the power supply unit, whic...

AI Technical Summary

Problems solved by technology

However, due to the complex parameter adjustment and high requirements during the use of phase-shifted full-bridge technology, usually only the ZVS of the upper half-bridge can be realized, which is a difficult point in the field of power supply design

In addition, due to the addition of a phase-shifting transformer, its loss will increase, thereby reducing the efficiency of the power supply unit, which is subject to certain restrictions in the design of high-density and high-power power supplies

Furthermore, there are only a handful of manufacturers that can provide phase-shifted full-bridge driver ICs, so users have narrow choices and high costs

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