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The auto time delay step-down starting regulated power suppl

2014-11-18 02:40  
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The auto time delay step-down starting regulated power supply circuit
The principle of the circuit is shown in the figure. When the switch S1 is pulled in, the current is phase-shifted by the load and the net composed of R5, R2 and C1, the circuit is conducted by the dual-channel trigger diode VD3 and trigger SCR. As the resistance of R2 is high, the SCR conducting angle is small. At the moment, the output terminal can get a low voltage(which can be designed to be 0 as the delaying starter). SCR can be chosen as 6A/600V, the trigger current is lower than 10mA SCR; VT1 is an ordinary MOSFET, such as 3DJ6 or 3DJ7,etc.