Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Reexamination Certificate
2005-02-15
2005-02-15
Wong, Don (Department: 2821)
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
C315S381000
Reexamination Certificate
active
06856104
ABSTRACT:
The high voltage supply for a picture tube comprises a high voltage transformer, which generates the anode voltage of the picture tube, and a high voltage module with a switched mode power supply for providing a grid voltage, which is higher than the anode voltage. The output of the high voltage transformer is coupled to the transformer of the switched mode power supply, for adding the output voltage of the switched mode power supply to the high voltage of the high voltage transformer. Preferably, the transformer of the switched mode power supply provides the high voltage isolation, and at least the high voltage part of the module including the transformer is potted with a resin. The high voltage module provides advantageously also an output for a connection to the anode of the picture tube, so that the module can be used with present high voltage transformers, without requiring any modification. The primary side of the switched mode power supply comprises a control stage with adjustable means for setting a specific output voltage of the power supply. In a preferred embodiment, this output voltage is adjustable between 300 and 500 Volts, with respect to the high voltage of the high voltage transformer.
REFERENCES:
patent: 4356435 (1982-10-01), Kalmanash
patent: 4442451 (1984-04-01), Kalmanash et al.
patent: 4476485 (1984-10-01), Kalmanash
patent: 4626737 (1986-12-01), Takenaka et al.
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patent: 4658342 (1987-04-01), Wharton
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patent: 4766390 (1988-08-01), Wharton et al.
Läufer Martin
Lopez Daniel
Louvel Jean-Paul
Fried Harvey D.
Henig Sammy S.
Thomson Licensing S.A.
Tran Chuc
Tripoli Joseph S.
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