Patent ID: 6661187
Filing Date: 2003-12-09
Classification: H01F

Abstract:
A fly back transformer for providing a DC high voltage and at least one focusing voltage to a CRT in a TV set or monitor, comprising:a horizontal output section for receiving horizontal synchronous pulse and generating sawtooth wave; a low-voltage bobbin having a low-voltage wire wound around the outside surface thereof to form a first coil; a high-voltage bobbin having a plurality of high-voltage wires wound for plural times interposing insulating films around said high-voltage bobbin to form a second coil having a number of high-voltage coil layers and a plurality of high-voltage rectifier diodes each connected in series between each of plural upper terminal pins and each of plural lower terminal pins; a focusing pack having a PCB internally mounted thereto by molding insulating resin, said PCB being printed with an adjustable resistor to adjust the at least one focusing voltage, and a focus input terminal for receiving the focusing voltage; a bleeder resistor detachably fixed in position to said high-voltage bobbin, and having an upper end electrically connected with one of said upper terminal pins corresponding to a high-voltage terminal to output the final high voltage generated from said high-voltage bobbin and a lower end electrically connected to said focus input terminal; and a focus-drawing wire disposed between the first one of said high-voltage coil layers and the last one of said high-voltage coil layers, and having one end connected with one of said upper terminal pins to draw a voltage generated between the high-voltage terminal and a low-voltage terminal of said high-voltage bobbin and the other end connected with said lower end of the bleeder resistor electrically connected with said focus input terminal of the focusing pack.