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US 5,675,219 AGranted
Degaussing circuit for wide-range ac
AssigneeThomson Consumer Electronics, Inc.
InventorKenneth Jay Helfrich
Life of this patent
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Abstract
An automatic degaussing circuit provides a video display apparatus with a degaussing capability over a wide range of ac mains sources. An ac mains source is coupled to a degaussing coil by a series interconnection of first and second temperature-sensitive resistances. The temperature-sensitive resistances have oppositely-tending temperature coefficients, so that a total dc impedance of the automatic degaussing circuit initially decreases after power is applied to the circuit.
Claims10
A degaussing circuit for a cathode ray tube, comprising:
- a source of alternating voltage potential;
- a switch means coupled to said source;
- a first temperature-sensitive device coupled to said switch means;
- a second temperature-sensitive device coupled to said first device;
- and
- a degaussing coil coupled to said second temperature-sensitive device;
- wherein a degaussing current flowing through said first and second temperature-sensitive devices is equal to a degaussing current flowing through said degaussing coil.
4 more elements
Dependencies are inferred from the claim text.