A Full Bridge Converter with Freewheeling Path

Abstract

The invention discloses a full bridge converter with a freewheeling path, comprising: a full bridge bridge arm 1, a DC blocking capacitor 2, an energy transfer transformer 3, an energy main output path 4, and an energy freewheeling path 5; the full bridge The bridge arm is composed of four power switching devices; the DC blocking capacitor 2 and the primary winding of the energy transfer transformer 3 are connected in series with the center of the leading arm and the lagging arm of the full bridge arm respectively; the energy main output path 4 is composed of The primary and secondary windings of the transformer 3, four rectifier diodes and the main filter inductance; the energy freewheeling path 5 is composed of the auxiliary secondary winding of the transformer 3, four rectifier diodes, π-type filter, resonant capacitor and freewheeling clamp Diodes; the energy main output path 4 and the energy freewheeling path 5 are connected in parallel. The invention solves the disadvantages of large rectifier diode voltage stress, loss of duty cycle, large circulation loss and the like existing in traditional full-bridge converters, and can realize wide-range adjustment of output voltage from zero to maximum gain.

Description

technical field [0001] The invention relates to a high-performance full-bridge soft-switching converter, specifically a full-bridge converter that realizes full-range soft switching, low voltage stress, high conversion efficiency and full voltage range output, and is suitable for high-power Charging equipment or other DC power supply equipment with wide output voltage regulation range. Background technique [0002] With the development of industry and agriculture and the advancement of battery technology, energy storage battery power systems are more and more widely used, and the battery capacity is also increasing. For example, electric vehicle energy storage batteries, mining power locomotive traction battery power systems, and island microgrid energy storage battery power systems are all high-voltage and large-capacity energy storage battery systems. In order to improve energy utilization, reduce carbon emissions, and improve economic benefits, the charging power supply ...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a full-bridge converter with a freewheeling path for the above-mentioned deficiencies in the prior art, which solves the problem that the lagging arm in the prior art cannot realize ZVS at light load, and solves the It solves the problem of large voltage ringing peak of the secondary rectifier diode, reduces the voltage stress, effectively reduces the main circuit circulation loss of the full-bridge power converter, reduces the loss of duty cycle, and can realize the output voltage from zero to the maximum value Ultra-wide range adjustment, suitable for charging of high-voltage and large-capacity battery systems and related applications that require high voltage and wide voltage output range

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