H - Electricity – 01 – J
Patent
H - Electricity
01
J
350/102
H01J 31/18 (2006.01) H03K 4/62 (2006.01) H04N 3/233 (2006.01)
Patent
CA 1107855
ABSTRACT OF THE DISCLOSURE In a circuit for controlling the current flow through a coil, such as, the horizontal deflection coil of a television receiver, a first switching circuit indlucing a first switching transistor and a first damper diode is connected in parallel with a first resonant circuit indlucing a first capacitor and a first coil which is the coil through which the current flow is to be controlled, a second switching circuit including a second switching transistor and a second damper diode is connected in parallel with a second resonant circuit including a second capacitor and a second coil, first and second charging capacitors are connected in series to the first and second coils, respectively, and the power is supplied to the first and second resonant circuits through a third coil. Switching signals of the same frequency, for example, the horizontal frequency of a video signal, are applied to the first and second switching transistors with the phase difference between such signals being controlled to vary the voltages across the first and second charging capacitors differentially and hence the current flowing through the first coil. The phase difference between the switching signals is varied or modulated by a parabolic correcting signal having the vertical rate or frequency of a video signal in the case where a side pin-cushion distortion of the raster of a cathode ray tube is to be corrected, or the phase difference can be modulated by a sawtooth. wave signal having the vertical frequency so that the voltage across the first or second charging capacitor is the sawtooth wave signal with the vertical frequency, so if the vertical deflection coil is connected across the first or second charging capacitor, the vertical deflection circuit can be realized.
324049
Ishigaki Yoshio
Nagai Tamiji
Yoshida Susumu
Gowling Lafleur Henderson Llp
Sony Corporation
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