Deflection system with overscan protection

Details Deflection system with overscan protection Deflection system with overscan protection

H - Electricity

04

N

350/103

H04N 3/30 (2006.01) H03K 4/08 (2006.01) H03K 4/72 (2006.01) H04N 3/223 (2006.01)

Patent

CA 1058317

DEFLECTION SYSTEM WITH OVERSCAN PROTECTION Abstract of the Disclosure In a deflection system including an oscillator and an amplifier providing scanning current for a deflection winding, a parabolic voltage developed at the deflection winding is superimposed on the oscillator direct current operating voltage in such a proportion that an increased parabolic voltage level, indicative of excessive scanning current from either an overscan or low operating frequency condition, causes the oscillator to operate at a higher frequency which decreases the deflection winding current and therefore the parabolic voltage and thereby permits the use of less expensive circuit components having lower maximum voltage level ratings. -1-

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