Horizontal output transistor protection circuit

Details Horizontal output transistor protection circuit Horizontal output transistor protection circuit

1982-06-30

1984-07-10

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2970, H01J 2976

Patent

active

044595174

ABSTRACT:
In a television receiver having an SCR switching regulator power supply, excessive power supply loading or high line voltage may cause abnormal operation of the switching SCR resulting in a rapid variation of the regulated supply voltage above its regulated level. This voltage variation causes high peak current in the horizontal output transistor, causing it to fail. A detector circuit monitors both the average current and the peak current through the horizontal output transistor and causes the receiver to be disabled in the event either current level becomes excessive.

REFERENCES:
patent: 3858084 (1974-12-01), Manners
patent: 4045742 (1977-08-01), Meehan et al.
patent: 4047078 (1977-09-01), Meehan
patent: 4074323 (1978-02-01), Griffey
patent: 4090111 (1978-05-01), Suzuki
patent: 4147964 (1979-04-01), Luz et al.
patent: 4198661 (1980-04-01), Gatten et al.
patent: 4234829 (1980-11-01), Willis
Schematic Diagram-CTC-85 Television Receiver.
Mitchell, The CTC 85 Color Chassis Technical Manual, 1977, pp. 61-66.

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