Patent ID: 6417632
Filing Date: 2002-07-09
Classification: H04N

Abstract:
A deflection apparatus comprising:a) a pulse width modulation (PWM controlled power supply circuit for generating a supply voltage for obtaining a desired horizontal amplitude responsive to an input pulse synchronized with a horizontal synchronizing signal, b) a PWM voltage controller for discriminating a frequency of said horizontal synchronizing signal, and controlling an output voltage of said PWM controlled power supply circuit responsive to the frequency, c) an oscillator for outputting a horizontal oscillation pulse synchronized with said horizontal synchronizing signal, d) an oscillation frequency switching controller for outputting a frequency changeover signal to said oscillator in order to change over the frequency of said horizontal pulse responsive to a change of the output Voltage of said PWM controlled power supply circuit, and e) a horizontal deflection output circuit for generating a deflection current synchronized with said horizontal oscillation pulse.