Deflectional system for a television set comprising a power tran

Details Deflectional system for a television set comprising a power tran Deflectional system for a television set comprising a power tran

1985-05-30

1987-02-24

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2970, H01J 2972

Patent

active

046459863

ABSTRACT:
The invention relates to a deflectional system of a television set comprising a power transistor and a driving circuit which supplies a deflection current increasing in ramp-shaped manner to a deflection coil. The driving circuit is periodically fed with switching-on pulses of a duration corresponding to the ramp length of the deflecting current. The driving circuit applies an increasing switched-on base current to the power transistor during the switching-on pulse duration, said switched-on base current driving the power transistor into the saturation state during substantially the entire switching-on pulse duration. After termination of the switching-on pulse, the driving circuit controls the power transistor with a switching-off base current which rapidly decreases in relation to the increase of the switched-on base current and finally changes polarity and which effects a rapid return of the power transistor from the saturation state into the blocking state. The power transistor has a sensor means associated therewith which supplies to the driving circuit an actual-value signal which is proportional to the instantaneous value of the transistor main current. The driving circuit regulates the switched-on base current, during the entire increase thereof and in accordance with said actual-value signal, to a value which maintains the power transistor in the saturated stated with only a slight degree of saturation. The driving circuit controls the steepness of the switching-off base current proportionally to the actual-value signal occurring at the end of the switching-on pulse.

REFERENCES:
patent: 4147963 (1979-04-01), Shiotani
patent: 4442384 (1984-04-01), Maekawa et al.
patent: 4536682 (1985-08-01), Ten Pierick
IBM Technical Disclosure Bulletin, vol. 17, No. 4, Sep. 1974, K. H. Knickmeyer, pp. 1091-1092.
Arentsen et al, Electronic Applications, vol. 34, No. 2, Philips Semiconductor Application Lab., pp. 52-60.
Loewe Opta, Circuit Schematic, Aug. 1st, 1980.
Thomson-Brandt, Circuit Schematic, Apr. 15th, 1981.
Blaupunkt, Circuit Schematic, (undated).
Grundig, Circuit Schematic, (undated).
ITT, Circuit Schematic, (undated).
Telefunken, Circuit Schematic, (undated).
Schneider, Circuit Schematic, (undated).

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