Circuit for controlling current flow from an A.C. source to a lo

Details Circuit for controlling current flow from an A.C. source to a lo Circuit for controlling current flow from an A.C. source to a lo

1979-08-13

1981-05-19

Chatmon, Jr., Saxfield

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Pulsating or a.c. supply to the cathode or heater circuit

315102, 328262, 219 1055B, 331 86, 307252Q, H05B 3900, H05B 4114

Patent

active

042687799

ABSTRACT:
A circuit for controlling power consumption of a load, by controlling the flow of current thereto, utilizes at least one parallel combination of non-linear resistance elements, such as a varistor and the like, and a gateable semiconductor switching device, such as a triac and the like, to substantially reduce or prevent current flow when the semiconductor switching device is gated to an "off" condition and to enable normal current flow to a load when the semiconductor switching device is gated to an "on" condition. Embodiments of the power circuits for control of magnetron power, in a microwave oven, are illustrated.

REFERENCES:
patent: 3374443 (1968-03-01), Braum et al.
patent: 3611017 (1971-10-01), Freeland
patent: 3651371 (1972-03-01), Tingley
patent: 3872277 (1975-03-01), Niu
patent: 3943317 (1976-03-01), Nagamoto
patent: 4001537 (1977-01-01), Burke et al.
patent: 4012617 (1977-03-01), Burke et al.
patent: 4096369 (1978-06-01), Tanaka et al.
patent: 4121149 (1978-10-01), Seltzer

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