Transformer coupled voltage clamp for pincushion correction circ

Details Transformer coupled voltage clamp for pincushion correction circ Transformer coupled voltage clamp for pincushion correction circ

1990-12-14

1991-08-27

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2956

Patent

active

050436376

ABSTRACT:
A horizontal deflection system comprises a horizontal deflection yoke and a resonant retrace circuit coupled to the yoke and to a switched energy source for generating a horizontal deflection current in the yoke. A diode modulator is coupled to the resonant retrace circuit. A control circuit operable in a switched mode supplies a control signal to the diode modulator for modifying the deflection current to correct for side pincushion distortion. A transformer has a first winding coupled to the diode modulator and to the control circuit for recovering energy from the diode modulator. The transformer has a second winding for receiving the recovered energy from the first winding. A diode clamp is coupled to the second winding and to a load driven by a voltage source at a first voltage level, for transferring the recovered energy from the second winding to the load. The energy is transferred from the first winding to the second winding at a second voltage level across the first winding determined by the first voltage level and the turns ratio of the transformer. The second voltage level defines an effective voltage clamping level and is related to the operating range of the diode modulator. The second voltage level can be adjusted to levels different from the first voltage level by changing the turns ratio of the transformer.

REFERENCES:
patent: 4329729 (1982-05-01), Knight
patent: 4594534 (1986-06-01), Haferl
patent: 4910441 (1990-03-01), Wetta
patent: 4916366 (1990-04-01), Wilber et al.

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