Side pincushion modulator circuit with overstress protection

Details Side pincushion modulator circuit with overstress protection Side pincushion modulator circuit with overstress protection

1980-06-23

1982-05-11

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 56, 358245, 315399, 315393, H02H 320

Patent

active

043297293

ABSTRACT:
A side pincushion corrected deflection circuit for a television receiver includes a deflection winding, a trace capacitor and a first switch for generating scanning current in the deflection winding. A modulator circuit includes a modulator inductor and capacitor and a second switch for generating a sawtooth modulator current in the inductor. The trace and modulator capacitors are charged from a B+ operating voltage source through the primary winding of a flyback transformer. A transistor stage in the modulator circuit shunts current away from the modulator capacitor to control the modulator and trace capacitor voltages. A vertical rate bias voltage is applied to the transistor stage and varies the shunt current at a vertical rate in a parabolic manner to provide side pincushion correction. Under fault conditions, such as an open-circuited deflection winding or trace capacitor, the modulator capacitor voltage tends to undesirably increase above the peak voltage developed under normal operating conditions. To prevent overstressing the modulator transistor stage, a diode clamp is coupled between the modulator capacitor and a source of reference voltage, thereby preventing the modulator capacitor voltage from substantially exceeding the reference voltage level.

REFERENCES:
patent: 3302056 (1967-01-01), Preisig
patent: 3506844 (1970-04-01), Rohloff
patent: 3894269 (1975-07-01), Ahrens
patent: 3906305 (1975-09-01), Nillesen

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