| 摘要 |
PROBLEM TO BE SOLVED: To eliminate higher harmonics of a transformer A and a step-up transformer B and make waveforms approach to sine waves by a method wherein integer times superposing waves are generated, higher harmonic which increases power source capacity when the operation power-factor to an AC input is low and causes voltage drop and fluctuation at the time of delayed power-factor is cut off, and a stepwise wave of the superposing wave turning to a problem of power-factor improvement is made to approach to a sine wave by increase of tap input lines together with a filter capacitor for power. SOLUTION: Circuits 2 phase-rectify currents and voltages from CT sensors 6 of the transformer A and the transformer B. The outputs are made to pass filter amplifiers 3 for waveform shaping, and inputted in a multiplier 1 in the state of equal phases. Distorted currents from both the transformers are synthesized and detected by the multiplier IC 1. In an analog switch 4, the currents and voltages from the CT sensors 6 which divide the currents and voltages into positive values and negative values are phase-rectified. After DC liner detection with an IC, positive and negative pulse widths are inputted in tap lines of a 6-stage multiple wave. |
