Patent ID: 6246554
Filing Date: 2001-06-12
Classification: H04N

Abstract:
A surge protector for a video display apparatus, said surge protector comprising:a controller for receiving horizontal and vertical sync signals and a plurality of control signals and for outputting a switching control signal in response to a control signal;a switching signal generator for outputting a switching signal in response to the horizontal and vertical sync signals and the switching control signal from said controller;a switching circuit for receiving first and second external voltages, and for outputting the second voltage in response to the switching signal and selectively enabling a path of said second voltage from said switching circuit in response to said control signal;a high voltage generator for generating a high voltage in response to the second voltage inputted from said switching circuit;a constant-voltage circuit for comparing the high voltage from said high voltage generator with a predetermined reference voltage and for generating a constant-voltage control signal for controlling a duty cycle of the second voltage of said switching circuit in response thereto; anda surge voltage protector for respectively supplying the control signal from the surge voltage protector to said controller and said switching circuit in response to the constant-voltage control signal for controlling the path of the second voltage.