Television receiver power supply regulation responding to beam current changes
First Claim
1. A television receiver incorporating means for providing a plurality of load circuit voltage supplies including means for deriving a high voltage level from one of said load circuit voltage supplies, said high voltage level subject to reduction in response to a receiver operating characteristic, said receiver operating characteristic also loading said one of said load circuit voltage supplies, therefore producing an ac ripple component in the voltage level of said one of said load circuit voltage supplies, said receiver comprising:
- a deflection circuit energized by said one of said load circuit voltage supplies for providing an electron beam deflection current, the level of said current determined by the average dc level of the voltage of said one of said load circuit voltage supplies;
control means responsive to a voltage level for controlling the operation of said voltage supply providing means in order to maintain the voltage levels of said voltage supplies substantially constant; and
means coupling said one of said load circuit voltage supplies to said control means comprising detector means for providing a voltage level to said control means representative of the peak level of the voltage of said one of said load circuit voltage supplies, such that said average dc level of the voltage of said one of said load circuit voltage supplies decreases in response to the presence of said ac ripple component to compensate said electron beam deflection current for said reduction in said high voltage level.
2 Assignments
0 Petitions
Accused Products
Abstract
The raster scanned by a television receiver deflection circuit is subject to an increase in size resulting from a decrease in high voltage level caused by increasing electron beam current. The receiver comprises a switched mode power supply producing a voltage supply that is used to power the deflection circuit and generate the high voltage. The voltage supply level incorporates an ac ripple component caused by loading on the supply due to increasing beam current. A peak detector senses the peak level of the voltage supply and applies it to a regulator control circuit which maintains the peak level of the supply voltage constant. Increasing beam current loads the supply, decreasing the average dc voltage level applied to the deflection circuit, thereby decreasing the electron beam scan to compensate for a reduction in high voltage level.
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Citations
12 Claims
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1. A television receiver incorporating means for providing a plurality of load circuit voltage supplies including means for deriving a high voltage level from one of said load circuit voltage supplies, said high voltage level subject to reduction in response to a receiver operating characteristic, said receiver operating characteristic also loading said one of said load circuit voltage supplies, therefore producing an ac ripple component in the voltage level of said one of said load circuit voltage supplies, said receiver comprising:
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a deflection circuit energized by said one of said load circuit voltage supplies for providing an electron beam deflection current, the level of said current determined by the average dc level of the voltage of said one of said load circuit voltage supplies; control means responsive to a voltage level for controlling the operation of said voltage supply providing means in order to maintain the voltage levels of said voltage supplies substantially constant; and means coupling said one of said load circuit voltage supplies to said control means comprising detector means for providing a voltage level to said control means representative of the peak level of the voltage of said one of said load circuit voltage supplies, such that said average dc level of the voltage of said one of said load circuit voltage supplies decreases in response to the presence of said ac ripple component to compensate said electron beam deflection current for said reduction in said high voltage level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification