Single-ended Foward Transforming Switching Regulated Power Supply Application Circuit

Published:2011/11/13 21:55:00 Author:May | Keyword: Single end, positive energize, converter type, switching, regulated power supply | From:SeekIC

The diagram is single-ended Foward Transforming Switching Regulated Power Supply Application Circuit. The isolation effect is good because it adopts photo-coupler in the feedback loop. The output voltage of this power supply is 5V. The output current is 10A. When the power supply is broken over, it will output 300V DC voltage through the rectifying and filtering of VD1, L1, C1. It is added on switching tube VT1 directly, and it will provide a working voltagefor control circuit tomake it work. During the switching tube VT1 is breaking over, the secondary winding N2 of transformer T gets energy. Its polarity can make rectifier diode VD3 breakover. When output voltage Uo is increasing due to some reasons, the current of VT4, VT5 is increasing. This current is coupling to VT2 through photo-coupler VT3, it can decrease the internal resistance of VT2, thereby the base potential of control switching tube VT1 is decreasing, VT1's duty factor is decreasing, Uo is dropping down.



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