Circuit and method for adjusting horizontal retrace time and lim

Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits

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315384, H01J 2970, H01J 2976

Patent

active

057148490

ABSTRACT:
A circuit for adjusting a horizontal retrace time and limiting a pulse peak in a display device includes a microcomputer for receiving a horizontal synchronous frequency and converting the horizontal synchronous frequency into a first voltage. A pulse generator compares the first voltage provided from the microcomputer with a triangular waveform to adjust a width of a retrace time adjusting pulse. A transformer receives an output voltage from the pulse generator to generate an induced voltage. A switching unit performs a switching operation in accordance with a magnitude of the induced voltage provided from the transformer. A clamping unit clamps the induced voltage provided from the transformer to limit a voltage peak value. A charging/discharging unit performs charging and discharging operations according to an output of the switching unit. A feedback unit rectifies, smoothes and divides the induced voltage at a secondary side of the transformer to generate a rectified, smoothed and divided voltage, and feeds the rectified, smoothed and divided voltage back to the pulse generator.

REFERENCES:
patent: 4687972 (1987-08-01), Haferl
patent: 4705993 (1987-11-01), Kashiwagi
patent: 4956587 (1990-09-01), Kitou et al.
patent: 5043637 (1991-08-01), Gries et al.
patent: 5399945 (1995-03-01), Haferl
patent: 5510845 (1996-04-01), Yang et al.
patent: 5528112 (1996-06-01), George et al.

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