#6 Control circuit for horizontal oscillator

Details #6 Control circuit for horizontal oscillator #6 Control circuit for horizontal oscillator

1988-07-13

1990-01-02

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

315364, 358159, H03L 708, H04N 512

Patent

active

048916080

ABSTRACT:
A horizontal oscillation circuit which prevents damage of horizontal output transistors due to the rapid increase of horizontal deflection current at varying states of horizontal scan frequency or at the turning-on state of the power source. The horizontal oscillation circuit is provided with a speed up circuit which rapidly increases the control voltage supplied to a control voltage terminal of a voltage controlled oscillator. This provides increased speed of the oscillation frequency of the voltage controlled oscillator which does not slow in comparison to increasing speed of power source voltage. Consequently, the horizontal deflection current remains nearly constant, even at varying states of the horizontal scan frequency of the turning-on state of the power source, and damage to horizontal output transistors is avoided.

REFERENCES:
patent: 4634939 (1987-01-01), Dietz

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