Deflection circuit to control base current of output transistor

Details Deflection circuit to control base current of output transistor Deflection circuit to control base current of output transistor

2007-09-18

2007-09-18

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

C315S403000, C315S404000, C315S405000

Reexamination Certificate

active

11221781

ABSTRACT:
A horizontal deflection circuit having a horizontal output transistor that receives an input horizontal driving signal and drives a horizontal deflection coil includes a current controlling unit to selectively perform an operation to decrease a base current applied to a base terminal of the horizontal output transistor, and a controlling unit to sense a frequency of the horizontal driving signal and to enable the operation of the current controlling unit when the sensed frequency of the horizontal driving signal is higher than a predetermined level. Accordingly, the horizontal deflection circuit can control the base current of the horizontal output transistor according to a frequency mode, thereby decreasing damage to the horizontal output transistor.

REFERENCES:
patent: 6259217 (2001-07-01), Song
patent: 6323606 (2001-11-01), Qian
patent: 6686929 (2004-02-01), Bang
patent: 06-27897 (1994-02-01), None
patent: 07-298084 (1995-11-01), None
patent: 10-79867 (1998-03-01), None
patent: 10-98632 (1998-04-01), None
patent: 1998-0079108 (1998-11-01), None
Korean Office Action dated May 29, 2006 of Korean Patent Application No. 10-2004-0081839.

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