Low Supply Voltage Thyristor Control Circuit

Published:2011/8/4 9:18:00 Author:Robert | Keyword: Low, Supply, Voltage, Thyristor, Control | From:SeekIC

This circuit's power supply voltage is 12~16V which can be used in toy trains and other low voltage devices. By using S566B as the trigger circuit which control the conduction of the thyristor. The DC power is provided by rectifier regulator circuit. The R1 is voltage dropping resistor which make the regulator has very low voltage. The middle transistor T1's function is reduce the control dead zone. Because the circuit's loading current is very low, however the bidirectional transistor's current is higher than its maintaining current, it could connect a 1~2W lamp. Because the transformer's output power is very low, in the moment of the conduction of the bidirectional transistor, for the fast increasing current, the transformer's leakage inductance is equivalent to a large series resistor, which would cause a short-term voltage discontinuous case. So it should connect a capacitor C4 in series (dotted line).



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Control_Circuit/Other_circuit/Low_Supply_Voltage_Thyristor_Control_Circuit.html

Print this Page | Comments | Reading(3)