| 摘要 |
PURPOSE:To cause the drive current waveform to approach an ideal waveform by reducing the level change of the on-direction drive current dependent upon the change of the duty factor of switching pulses in the horizontal output circuit of a TV receiver. CONSTITUTION:Coil 10 constituting an impedance element is connected to secondary coil 4a of drive transformer 3 where switching pulse p1 from pulse oscillator 1 is inputted, and diode 12 which flows the reverse direction base current to outputtidng transistor Tr8 is connected in parallel with coil 10. Further, coil 10 is divided into two and is constituted by coils 11a and 11b, and the collector of Tr13 is connected to the connection point of them, and the emitter grounded. Further, pulse width control circuit 14 which changes the duty factor of switching pulse P1 to output switching pulse p2 is connected to the base of Tr13; and when Tr8 is turned on, the energy accumulated in coil 10 is selected to be small. |
