High-power full-bridge converter circuit diagram

Published:2011/4/22 18:42:00 Author:Nicole | Keyword: full-bridge converter | From:SeekIC

The two electrolytic capacitors of half-bridge converter circuit are changed to the other two high voltage power transistors, and coupled with appropriate drive circuit then can be composed of full-bridge converter circuit, the figure is as shown. VT1, VT2, VT3, VT4 form 4 bridge arms. High frequency transformer T is connected between them. Relative VT1, VT4 and VT2, VT3 alternately inspired by the drive circuit turning on, the DC input voltage into a high-frequency square-wave transform AC voltage. The course of working is the same as push-pull power converter circuit. Thus, when the high frequency transformeris working, the voltage of primary coil is considered to the supply voltage, it is twice the half-bridge circuit output voltage, the pressure of each transistor remains at the supply voltage, twice the output power increases. If the current reach half-bridge circuit, that means the current increases twice, then the output power can increase 4 times. The main disadvantages of full-bridge circuit is thatit needs 4groups transistor base drive circuits which are insulative with each other, complex and increase the cost of the control drive circuit.



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