| 摘要 |
PCT No. PCT/JP91/00856 Sec. 371 Date Apr. 26, 1993 Sec. 102(e) Date Apr. 26, 1993 PCT Filed Jun. 26, 1991 PCT Pub. No. WO93/00765 PCT Pub. Date Jan. 7, 1993.A stabilized high voltage power supply circuit in a cathode-ray-tube using electromagnetic deflection. A secondary side of a transformer for controlling high voltage is connected with and arranged at a primary side of a flyback transformer. Further a controlling circuit is connected with and arranged at the primary side of the transformer for controlling high voltage. The controlling circuit comprises an operational amplifier for outputting direct current in accordance with a voltage difference between a predetermined reference voltage and a feedback voltage in a high voltage output, a first transistor for base-inputting rectangular wave forms generated at a primary side in a transformer for controlling high voltage and connecting an output of said operational amplifier with an emitter and a second transistor for controlling a primary coil current in said transformer for controlling high voltage in accordance with ON/OFF in the first transistor. The controlling circuit serves to control a peak value of a pulse which is generated at the secondary side in the transformer for controlling high voltage due to controlling the primary coil current in the transformer for controlling high voltage in accordance with a variation of the high voltage output. The controlled pulse is so overwrapped that a high voltage output level is maintained at constant in the primary side of the flyback transformer, thereby a stabilization of high voltage output is achieved.
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