Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1997-09-30
1999-10-19
Westin, Edward P.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315370, 315389, 315399, 315403, 315408, 348806, H04N 3233, H04N 323, H01J 2970, G09G 104
Patent
active
059694874
ABSTRACT:
A deflection circuit generates a deflection current (If) through a deflection coil (Lf). The deflection circuit includes a series resistor (Rs) arranged in series with the deflection coil (Lf) to supply a feedback voltage (Vf;Vr), and a drive circuit (1,5) which has an output coupled to the series arrangement of the deflection coil (Lf) and the series resistor (Rs). The drive circuit (1,5) has an input coupled to the series resistor (Rs) to receive a feedback voltage (Vs). The drive circuit (1,5) further is coupled to a conversion resistor (Rc) for receiving an input waveform (Vi). The drive circuit (1,5) is arranged in a feedback loop to obtain a deflection current (If) with a shape resembling the input waveform (Vi). The deflection circuit further includes a damping impedance (Rd) arranged in parallel with the deflection coil (Lf), and a current generating circuit (3) for generating a correction current (Ic) within the flyback period (Tf). The current generating circuit (3) is coupled to the conversion resistor (Rc) and/or the series resistor (Rs), and is activated during at least a last part of the flyback period (Tf). In this way, the correction current (Ic) can easily be adapted with external components and does not suffer from tolerances in an integrated circuit.
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Philips Semiconductors Application Note AN95029, TDA 8350 and TDA 8351 deflection output circuits by Dick v.d. Brul and Pierre Duijkers, Apr. 1, 1995, pp. 1-43.
Gardner Shane R.
Goodman Edward W.
U.S. Philips Corporation
Westin Edward P.
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