Full-bridge power convertor circuit diagram with increase output power

Published:2011/5/5 7:24:00 Author:Nicole | Keyword: Full-bridge power convertor | From:SeekIC

The two electrolytic capacitors of half-bridge converter circuit are changed to the other two high back pressure power transistors, and coupled with appropriate drive circuit then canformfull-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 areinspired by the drive circuit, then theyturns onalternately, 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 transformer at work, the voltage of primary coil is considered to the supply voltage, it isone time ofthe half-bridge circuit output voltage, the pressure of each transistor remains at the supply voltage, twice the output power increases. If the current reaches 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 that it needs 4 groups transistor base drive circuits which are insulative with each other, it enlarges the cost and complicates the control drive circuit.



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