Non-isolated silicon controlled switching power supply

Published:2011/7/12 4:07:00 Author:TaoXi | Keyword: Non-isolated, silicon controlled, switching, power supply | From:SeekIC

The non-isolated switching power supply which is composed of the silicon controlled is as shown in the figure. The 220V AC voltage adds to the bridge type rectifier which is composed of the VD503, WD505, VD507, VD509 directly. The full-wave voltage that is output by it adds to the cathode of the adjustment device SCR529 through the current choking coil, you can change the output voltage by changing the phase position of the SCR529 trigger pulse. The output voltage is filted by the two-stage RC filter which is composed of the R544, C535 and R545, R546, C536 and it will change into the 155V smooth DC. The VT516 is the error amplifier tube. The VD518 is the zener diode which supplies the reference voltage to the VT516. The sampling voltage divider circuit is composed of the R531, R515, R514.



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