Picture display apparatus with a soft-start device

Details Picture display apparatus with a soft-start device Picture display apparatus with a soft-start device

1997-02-03

1998-08-18

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315387, G09G 104, H01J 2970

Patent

active

057962170

ABSTRACT:
The line-sweep power circuit is of the known type, in which the base current of the switching transistor (TP) is automatically maintained by a positive feedback provided by a winding (L2) of the EHT transformer. This circuit is synchronized by a signal transmitted by an opto-coupler (DE-TC). The duty factor of the control signal transmitted by the opto-coupler is modified in a progressive manner during the transitions of a start signal (RC) so as to interrupt the conductance of the power transistor at an ever earlier instant. This may be obtained, for example, by means an integrator (4, 8) to which the load resistor (R2) of a transistor (T0) with an open collector is connected, which is driven by a line synchronizing signal.

REFERENCES:
patent: 3793553 (1974-02-01), Sexton, Jr. et al.
patent: 5142206 (1992-08-01), Gries

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