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    • 9. 发明专利
    • CYCLE CONTROL AC POWER ADJUSTING DEVICE
    • JPS62118759A
    • 1987-05-30
    • JP25812485
    • 1985-11-18
    • FUJI ELECTRIC CO LTD
    • MARUO TETSUHIROINAGAKI KUNIHIKO
    • H02M1/08G05F1/45H02M5/10H02M5/12
    • PURPOSE:To reduce the exciting rush current of the transformer by performing the phase control for the first one cycle of the current flow period at the crest value of the source voltage and by closing the last semicycle of the cycle control in the opposite phase of the first semicycle of the phase control. CONSTITUTION:The voltage of an alternate current source 2 is inputted to a position control synchronous circuit 10 and a cycle control synchronous circuit 20. Receiving the output of the synchronous circuit 10, which goes to H level at the crest value phase and semi-crest value phase and then to L level at the zero potential phase, and also receiving the external stating signal, a current flow starting decision portion 30 outputs a current flow period signal. From this signal and the output synchronous signal of the cycle control synchronous circuit 20, a current flow closing decision portion 40 outputs the current flow command signal and the control signal. Receiving the phase control command signal outputted by the phase control decision portion 50 receiving this control signal and the current flow command signal and the output synchronous signal of the both synchronous circuits 10 and 20, a one-shot pulse generating circuit 60 outputs the pulse synchronous with the crest value phase for the first one cycle and then with the zero phase.