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US 4,073,004 AGranted
Power supply with voltage protection circuit
AssigneeRaytheon Company
InventorsDerek Chambers, A. Leonard Harley
Life of this patent
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Abstract
A display and power supply system in which the power supply uses a switching frequency which is higher than the highest linear deflection rate used in a cathode ray tube display device supplied by the power supply and in which the frequency of the power supply and the information repetitively displayed on the display are synchronized to eliminate interference of the power supply frequency with the display characteristics.
Claims3
In combination:
- a power supply including a synchronizing oscillator;
- a voltage detector including first and second sensing circuits for sensing magnitudes of voltage above and below first and second reference magnitudes, said detector comprising an oscillatory circuit producing a cyclical signal in response to a sensed magnitude of said voltage;
- and
- means driven by said cyclical signal for cyclically de-energizing said synchronizing oscillator, thereby turning off said power supply.
1 more element
Dependencies are inferred from the claim text.