Automatical noncontact regulator circuit

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

This regulator has no contact, its voltage regulation is precise and fast, the range of application is wide: AC150V～AC300V. Principle: mains supply enters D1~D4 full-bridge rectifier by L1, it is added to SCR, the conduction angle of SCR is controlled by BT33. A relaxation oscillator is composed of BT33, C, R1, R2, R3, and W, changing W can change the oscillation period. When the input voltage rises, the voltage on BT33 rises too, the oscillation becomes quick, the SCR conduction angle decreases, the voltage on SCR rises, the voltage on L1 is changeless; on the contrary, the voltage on SCR 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 all keep sine wave. The components selection: the current of D1~D4 and SCR depends on the capacity of B, it should have lager capacity, the compression should be more than 600V, R1 and R2 choose 3W resistance, W had better select more than 2Wadjustable or potentiometer.



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