A new Optical Frequency Response measurement method is presented to analyse ringing of deflection yokes and their interaction with the drive circuitry. Ringing is caused by high‐frequency electromagnetical oscillations. Various oscillation modes are identified and related to circuitry design. Experimental results show how the oscillations change in interaction with the drive circuit.
Abstract— A model is presented for the dissipation of CRT deflection coils allowing for better designs with lower dissipation. With experimental results it is shown that at high scan frequencies the skin effect in Litz wires can no longer be neglected compared to proximity losses. The reduction of the dissipation by increasing the number of separate conductors in a Litz wire is limited to the point where the losses due to the proximity effect become comparable to those due to the skin effect.
A new method is developed for estimating the hysteresis loss of a ferrite core of a deflection yoke. With this method, the losses of various ferrite materials are measured as a function of frequency and temperature. The results are compared to theory and are used to estimate the hysteresis loss in a 17"CMT ferrite core.
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