Aircraft window heat controller with switched impedances

Details Aircraft window heat controller with switched impedances Aircraft window heat controller with switched impedances

1982-05-07

1984-02-28

Paschall, M. H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219508, 219203, 219509, 219494, 328175, 323209, 323235, H05B 102

Patent

active

044343582

ABSTRACT:
An electrical resistance heater controller is provided with a plurality of circuit branches connected in parallel with each other and in series with a heating element and an external AC power source. Each circuit branch includes the series connection of a capacitor and a solid state switch. The switches are controlled by a gating device to switch during the zero crossing of the AC source voltage waveform. Power delivered to the heating element is controlled by varying the amount of series capacitance in the circuit.

REFERENCES:
patent: 3300712 (1967-01-01), Segsworth
patent: 4109134 (1978-08-01), Van Herten
patent: 4139723 (1979-02-01), Havas
patent: 4334147 (1982-06-01), Payne
AFFDL-TR-77-1, vol. 1, "Windshield Technology Demonstration Program," 9-1977, Douglas Aircraft.

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