Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1992-07-29
1994-02-01
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
H01J 2956
Patent
active
052835049
ABSTRACT:
A grid correction circuit for a television receiver includes a first memory for storing correction values for correcting the deflection current of the television receiver. A second memory perodically provides a test signal to a correction coil to correct the deflection of the television receiver. A switch periodically selectively connects the first memory to the correction coil and a correction current flows through the correction coil. The switch also periodically connects the second memory to the correction coil and a test current flows through the correction coil. An impedance is responsive to the correction coil and produces a correction voltage and a test voltage in response to the correction current and the test current respectively. A comparator receives the test voltage and compares the test voltage to a reference voltage and provides an output voltage having a first level when the test voltage is below the reference voltage and a second level when the test voltage is above the reference voltage. A processor receives the output voltage and changes the correction voltage to incrementally reciprocate above and below the reference voltage by a preslected increment to maintain the correction voltage at substantially the same level as the reference voltage over a long time period.
REFERENCES:
patent: 4099092 (1978-07-01), Beistow
patent: 4251754 (1981-02-01), Navarro et al.
patent: 4812713 (1989-03-01), Blanchard
Chauvin Jaques
Gleim Gunter
Heizmann Friedrich
Schweer Rainer
Blum Theodore M.
Deutsche Thomson-Brandt GmbH
Laks Joseph J.
Sragow Daniel E.
Tripoli Joseph S.
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