Automatical noncontact AC regulator circuit

Published:2011/5/13 2:44:00 Author:Nicole | Keyword: AC regulator | From:SeekIC

This circuit can adjust output voltage accurately and fast, when mains supply voltage is in the range of 150V～300V. The circuit is shown as below, after mains supply enters VD1~VD4 full-bridge rectifier by L1, it is added to SCR VT, the conduction angle of VT is controlledbyBT33. A relaxation oscillator is composed of BT33, C, R1, R2, R3, and KP, changing KP can change the oscillation period. When the mains supply voltage rises, the voltage on BT33 rises too, the oscillation becomes quick, the VT conduction angle decreases, the voltage on VT rises, the voltage on L1 dose not change; on the contrary, the voltage on VT drops, the voltage on L1 dose not change; thus the voltage coupled by L2 remains constant. Because it adopts full-bridge rectifier, so the voltage on L1 and L2 are all sine wave. The current of D1~D4 and VT depends on the capacity of transformer, it should have lager capacity, the compression should be more than 600V, R1 and R2 choose 3W resistance, KPhad batterselectmore than2W adjustable resistance.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Power_Supply_Circuit/Automatical_noncontact_AC_regulator_circuit.html

Print this Page | Comments | Reading(3)