Electric power conversion systems – Current conversion – With condition responsive means to control the output...
Patent
1978-11-21
1981-03-17
Shoop, William M.
Electric power conversion systems
Current conversion
With condition responsive means to control the output...
363128, 323326, 323902, H02P 1324
Patent
active
042570913
ABSTRACT:
A power control circuit has a thyristor bridge interposed between a.c. buses connected to an a.c. power supply and a load. The firing circuit for the thyristors of the bridge includes a light actuated controlled rectifier for generating firing pulses. Two series connected resistor-capacitor pairs are connected in series across the a.c. buses. Taps intermediate the resistors and capacitors provide an energizing anode voltage to the controlled rectifier reduced with respect to the a.c. voltage in the buses. The voltage reducing and capacitive properties of the pairs render operation of the controlled rectifier immune to transient voltage spikes in the a.c. buses.
REFERENCES:
patent: 3675110 (1972-07-01), Kelley, Jr.
patent: 3710230 (1973-01-01), VeNard
patent: 3890561 (1975-06-01), Demarest
patent: 4039863 (1977-08-01), Ohhinata et al.
patent: 4058696 (1977-11-01), Antier et al.
patent: 4129791 (1978-12-01), Sato
patent: 4161022 (1979-07-01), Kanazawa et al.
Korn et al., "Photon Couplers", GE Application Notes, No. 200.62, Jun. 1972, pp. 13-21.
Shoop William M.
Wong Peter S.
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