Phase locked firing circuit for SCRS, or the like

Details Phase locked firing circuit for SCRS, or the like Phase locked firing circuit for SCRS, or the like

1976-11-26

1977-08-16

Shoop, William M.

Electric power conversion systems

Current conversion

Using semiconductor-type converter

307252N, 363128, H02M 700

Patent

active

040428737

ABSTRACT:
A circuit for providing firing signals for SCRs, particularly suitable for use where the power waveform is distorted. The firing signals are based on fixed angles of the power signal rather than on a time basis. Ramp signals from a ramp generator are compared with a loop error voltage or reference voltage for providing the SCR firing signals. A voltage controlled oscillator in a phase locked loop generates an undistorted signal used to start the ramp generator. The output of a lowpass filter in the phase locked loop provides a frequency compensating signal for controlling the slope of the ramp signals.

REFERENCES:
patent: 3582685 (1971-06-01), Bolmgren
patent: 3609517 (1971-09-01), Tucker
patent: 3671836 (1972-06-01), Kolatorowicz et al.
patent: 3683262 (1972-08-01), Neusser et al.
patent: 3932766 (1976-01-01), Kudeljan et al.
patent: 3942041 (1976-03-01), Morriss
patent: 3978394 (1976-08-01), Quayle
patent: 3999114 (1976-12-01), Poppinger et al.

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