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Suppression of Horizontal Deflection Current Ringing

IP.com Disclosure Number: IPCOM000038874D
Original Publication Date: 1987-Mar-01
Included in the Prior Art Database: 2005-Feb-01

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Palmucci, C Shevach, S [+details]


This article describes damping of ringing in a high-frequency flyback (.5-5 microseconds) resonant circuit for use in the horizontal deflection circuit of a cathode ray tube (CRT) display. In the circuit of Fig. 1, a potential is applied across a horizontal deflection yoke winding 10 in series with an inductor 12 by conduction of a high voltage transistor 14 under the control of a square-wave signal source 16. Thus, when the transistor 14 is turned on current flows through the deflection yoke 10. When transistor 14 is turned off by the pulse square wave applied to it by control 16, a flyback cycle is initiated. During this time, the energy in deflection yoke 10 is transferred into a flyback capacitor 18 as seen at 20 (Figs. (Image Omitted) 2A and 2B).