800W two-way dimmer control circuit

Published:2011/3/21 1:49:00 Author:Joan | Keyword: dimmer control | From:SeekIC

800W dimmer circuit: The below figure is a typical dimmer circuit. Circuit principle: the main circuit is a triac SCR. It controls SCR conduction angle to change the current through RL, so as to achieve dimming purpose. The trigger circuit is a single junction transistor phase-shift trigger. QL bridge rectifier provides synchronization power for the trigger circuit. the R1 reduced voltage, DW regulator provided synchronous voltage for the single-junction transistor, W and C1 form phase shift circuit. When the synchronous power charges C1 to unijunction transistor V1 peak voltage, V1 turns on, C1 discharged current generates pulses in the T1 secondary, which triggers SCR turn on. Adjusted W can change the SCR conduction angle. Pulse transformer winding: Wire around ferrite core 60 ~ 80T each with a diameter of 0.2mm magnet in the primary and secondary.



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