| 摘要 |
PROBLEM TO BE SOLVED: To save any converter for converting an AC voltage into a DC voltage and reduce the weight of a direct frequency converter, by connecting a commercial three-phase power supply with its waveform shaper and its gate controller to connect its gate controller with its waveform shaper, and by connecting subsequently its waveform shaper with its shaping transformer. SOLUTION: A commercial three-phase power supply is used as the input source of a direct frequency converter to connect the input power supply with a waveform shaper 5 and a gate controller 6. Further, the gate controller 6 is connected with the waveform shaper 5, and subsequently, the waveform shaper 5 is connected with a shaping transformer 7. The gate controller 6 generates the synchronized pulses with the phases of the frequency of the input power supply. The voltage of each phase of the input three-phase power supply is conducted from the conduction angle ofπ/3 to the one of 2π/3 during the term of its positive half cycle and is conducted from the conduction angle of 4π/3 to the one of 5π/3 during the term of its negative half cycle, and the conducted voltages of the three-phase power supply are inputted every phase to the primary-side windings of the shaping transformer 7. As a result, in the secondary-side winding of the shaping transformer 7, a single-phase AC voltage with its frequency three times as high as the one of the input three-phase AC voltage is obtained.
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