Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
257 words
A color television receiver degaussing system, comprising: a voltage source having first and second terminals across which an alternating current voltage is developed; rectifying means coupled to said first and second terminals for developing a direct current voltage at an output terminal of said rectifying means; a degaussing winding; switching means having a main current conducting path coupled between said output terminal and said degaussing winding and subject to enablement during normal receiver operation; means including first unidirectional current conducting means independent of said rectifying means, for establishing during alternate half cycles of said alternating current voltage a first path for the flow of current from said first terminal of said voltage source via said rectifying means, said main current conducting path of said switching means, at least a portion of said degaussing winding, and said first unidirectional current conducting means to said second terminal of said voltage source; and means including second unidirectional current conducting means independent of said rectifying means, for establishing during the intervening half cycles of said alternating current voltage a second path for the flow of current from said second terminal of said voltage source via said rectifying means, said main current conducting path of said switching means, at least a portion of said degaussing winding, and said second unidirectional current conducting means to said first terminal of said voltage source, the current flowing in said second path producing a degaussing flux of an opposite polarity to the polarity of the degaussing flux produced by the current flowing in said first path.
Claim 2
Dependent Claim
257 words
A color television receiver degaussing system, comprising: a voltage source having first and second terminals across which an alternating current voltage is developed; rectifying means coupled to said first and second terminals for developing a direct current voltage at an output terminal of said rectifying means; a degaussing winding; switching means having a main current conducting path coupled between said output terminal and said degaussing winding and subject to enablement during normal receiver operation; means including first unidirectional current conducting means independent of said rectifying means, for establishing during alternate half cycles of said alternating current voltage a first path for the flow of current from said first terminal of said voltage source via said rectifying means, said main current conducting path of said switching means, at least a portion of said degaussing winding, and said first unidirectional current conducting means to said second terminal of said voltage source; and means including second unidirectional current conducting means independent of said rectifying means, for establishing during the intervening half cycles of said alternating current voltage a second path for the flow of current from said second terminal of said voltage source via said rectifying means, said main current conducting path of said switching means, at least a portion of said degaussing winding, and said second unidirectional current conducting means to said first terminal of said voltage source, the current flowing in said second path producing a degaussing flux of an opposite polarity to the polarity of the degaussing flux produced by the current flowing in said first path.
Claim 3
Dependent Claim
67 words
A system according to claim 1 including a control circuit coupled to said switching means and responsive to an on/off command signal for enabling conduction of said main current conducting path in a on-state of said command signal, said control circuit further responsive to a signal representative of variations of a receiver energy level for varying the conduction of said switching means to regulate said energy level.
Claim 4
Dependent Claim
26 words
A system according to claim 2 including a first thermistor coupled to said degaussing winding for producing a decay of current flowing in said degaussing winding.
Claim 5
Dependent Claim
45 words
A system according to claim 3 wherein said degaussing winding comprises two coils, a first terminal of each coil coupled to said first thermistor, a second terminal of each coil being coupled to a different one of said first and second unidirectional current conducting means.
Claim 6
Dependent Claim
28 words
A system according to claim 3 including a voltage divider coupled across said degaussing winding, said first thermistor being coupled to a junction terminal of said voltage divider.
Claim 7
Dependent Claim
44 words
A system according to claim 3 including a second thermistor series arranged with said first thermistor, said output terminal being coupled to a junction terminal of the series arrangement of said first and second thermistors, said degaussing winding being coupled across said series arrangement.