H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/105
H04N 3/16 (2006.01) H03K 4/83 (2006.01)
Patent
CA 2039781
In a deflection system, a passive network is coupled to a source of flyback pulses for generating from energy in the flyback pulses a horizontal rate drive signal substantially independent of amplitude variations in the flyback pulses and having a substantially constant DC voltage reference level. An amplifier is coupled for receiving the horizontal rate drive signal as an input and has an output control signal for driving a deflection coil. The control signal has a DC voltage reference level corresponding to the DC reference level of the horizontal rate drive signal. A feedback stage for a signal related to deflection current is coupled between the coil and an input of the amplifier. A waveform generator develops a vertical rate waveform which is coupled to the amplifier as an input, for pulse width modulating the control signal. The deflection system may be, for example, a switched mode vertical deflection system or a switched mode pincushion correction system. In a switched mode vertical deflection system, the horizontal rate drive signal and the vertical rate waveform are ramp signals and the flyback pulses are horizontal flyback pulses. The passive network is DC coupled between the source of flyback pulses and the amplifier. The passive network comprises a Zener diode, a capacitor and a resistor connected in parallel.
Craig Wilson And Company
Thomson Consumer Electronics Inc.
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