Circuit for horizontal scanning of a video display apparatus, pr

Details Circuit for horizontal scanning of a video display apparatus, pr Circuit for horizontal scanning of a video display apparatus, pr

1996-09-17

1997-09-09

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315370, 315371, H01J 2970, H01J 2976

Patent

active

056660332

ABSTRACT:
A diode modulator circuit constituted by a switch (TR) in parallel with two diodes (D1, D2) arranged in cascade in the opposite direction, to which a deflection coil (LD) in series with a first S capacitance (CS1) and a winding of a transformer (TR) is connected. A second S capacitance (CS2) in series with a thyristor (TH) is connected, at one end, to the first S capacitance and, at the other end, to the common point (PMED) of the two diodes of the modulator, and the thyristor is correctly triggered by insulating its cathode with respect to the common point (PMED) by means of a diode (D4) and by arranging a divider bridge consisting of three resistors (R1, R2, R3) between said common point (PMED) and ground, the gate-cathode space being connected to the terminals of one of the resistors (R2).

REFERENCES:
patent: 4695774 (1987-09-01), Gent et al.
patent: 5155417 (1992-10-01), Tateishi
patent: 5517090 (1996-05-01), Bando

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