Line-synchronized-driver

  

Posted on Jun 1, 2012    12485

The gate drive that phase controls the four parallel SCRs is accomplished with complementary MOS hex gate MC14572 and two bipolar transistors. This adjustable line-synchronized driver pennits SCR conduction from near zero to 180 degrees. A Schmitt trigger clocks a delay monostable multivibrator that is followed by a pulse-width monostable multivibrator. Line synchronization is achieved through the half-wave section of the secondary winding of the full-wave, center-tapped transformer.


Line-synchronized-driver - schematic

This winding also supplies power to the circuit through rectifiers D 1 and D2.

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