Scr firing circuit

Details Scr firing circuit Scr firing circuit

H - Electricity

02

M

323/10

H02M 7/08 (2006.01) H02M 1/084 (2006.01) H02M 7/162 (2006.01)

Patent

CA 1247193

ABSTRACT OF THE DISCLOSURE An SCR firing circuit allows the firing point to be changed. The firing circuit includes a ROM which has an output for each gate of each SCR. The ROM is programmed to fire the SCRs in a desired sequence. The ROM is driven by a counter, which counts pulses from an oscillator, the frequency of which is variable. The difference between the zero cross of the waveform and the ROM output is compared and averaged. The comparator output is summed with a variable DC demand voltage. The sum is applied to an integrator, which provides an integrated output to the oscillator to change the frequency of the oscillator if the firing point is changed.

483387

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