Importance

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Abstract

A television receiver includes a full-wave rectifier and filter capacitor coupled to the A.C. power line for generating an unregulated direct operating voltage for the receiver. In order to provide a start-up voltage for certain portions of the receiver when the receiver is initially turned on, a transformer has a primary winding coupled between the rectifier and the filter capacitor which is responsive to the initial surge current in the capacitor. In order to protect the diodes of the rectifier from voltage surges which may enter the receiver from the A.C. line, a glow or ionization lamp is coupled across the primary of the start-up transformer. The glow lamps have unpredictable start-up voltages when operated in the dark interior of the receiver housing. The lamps are ionized independent of the presence of surges by coupling to the horizontal deflection circuit. With independent ionization of the glow lamp, the voltage drop and speed of response to surges is improved.

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First Claim