Full-bridge converter with freewheeling path

Abstract

The invention discloses a full-bridge converter with a freewheeling path. The full-bridge converter comprises 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 bridge arm is composed of four power switching devices. The DC blocking capacitor 2 and the primary winding of the energytransfer transformer 3 are connected in series and connected with the center of the leading arm and the lagging arm of the full-bridge bridge arm respectively. The energy main output path 4 is composed of a main secondary winding of the transformer 3, four rectifier diodes and a main filtering inductor. The energy freewheeling path 5 is composed of an auxiliary secondary winding of the transformer 3, four rectifier diodes, a pi-type filter, a resonant capacitor and a freewheeling clamping diode. The energy main output path 4 and the energy freewheeling path 5 are connected in parallel. According to the full-bridge converter with freewheeling path, the defects of large voltage stress, loss of duty ratio, large circulation loss and the like of a rectifier diode existing in a traditional full-bridge converter are overcome; and the wide range of the output voltage from zero to the maximum gain can be realized.

Description

Technical field [0001] The present invention relates to a high-performance full-bridge soft-switching converter, in particular to a full-bridge converter that realizes full-range soft switching, low voltage stress, high conversion efficiency and can realize full-voltage range output, and is suitable for high-power Charging equipment or other DC power supply equipment with wide output voltage adjustment range. Background technique [0002] With the development of industry and agriculture and the advancement of battery technology, energy storage battery power supply systems have been more and more widely used, and the battery capacity has also become larger. For example, electric vehicle energy storage battery, mining power locomotive traction battery power supply system, island microgrid energy storage battery power supply system, etc. are all high-voltage large-capacity energy storage battery systems. In order to improve energy utilization, reduce carbon emissions, and improve e...

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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