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A Transistorized Fifth Harmonically Tuned Horizontal-Deflection Circuit for Large-Screen Color TV

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2 Author(s)
J. A. Hornberger ; Delco Radio Division, GMC ; W. A. Robinson

One of the problems associated with horizontal deflection and high voltage systems utilizing third harmonic tuning of the flyback transformer for large screen color TV (25¿-90°tubes) has been the high voltage regulation. In tube sets, the shunt regulator has been widely used; and, more recently, a feedback scheme to the horizontal output tube has been used to achieve better regulation. However, the shunt regulator has proved undesirable because of reliability, and it is a potential source of X-rays. The feedback scheme does not lend itself to transistor circuitry because the horizontal transistor is operated as a switch. Therefore, in making a transition to transistor horizontal deflection and high voltage systems, regulation becomes a problem.

Published in:

IEEE Transactions on Broadcast and Television Receivers  (Volume:BTR-16 ,  Issue: 1 )