Changeover circuit for retrace capacitor

Details Changeover circuit for retrace capacitor Changeover circuit for retrace capacitor

1991-09-25

1992-10-20

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2970, H01J 2976

Patent

active

051573105

ABSTRACT:
A changeover circuit for a retrace capacitor switches ON/OFF a retrace capacitor for generating retrace pulses. The retrace pulses are necessary for preferable horizontal or vertical scanning in a TV picture tube, a mounting display or the like. A relay for opening/closing the connection between the retrace capacitor and the ground is provided and the ON/OFF operation of the relay is controlled by a control circuit. A diode is provided in parallel to the relay so as to suppress the on-state resistance and the negative inrush current.

REFERENCES:
patent: 4695774 (1987-09-01), Gent et al.
patent: 4906903 (1990-03-01), Ochiai
patent: 5059874 (1991-10-01), Oliver

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