Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1990-03-20
1991-07-16
Beha, Jr., William H.
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
363 49, 363 56, H02M 3335, H02M 5458
Patent
active
050329685
ABSTRACT:
A switching power source having a rectifier circuit and smoothing capacitor for obtaining a d.c. power from an a.c. input, an oscillator circuit constructed of a serial circuit of a primary winding of a power transformer and a switching element for intermittently turning on and off the d.c. power, the power transformer having another winding of the power transformer for detecting the oscillation state of the oscillator circuit, and a rush current preventing circuit constructed of a parallel circuit of a resistor and a thyristor for turning on the thyristor upon reception of a signal from another winding, the rush current preventing circuit being connected at the input side of the rectifier circuit or between the output side of the rectifier circuit and the smoothing capacitor, the switching power source comprising a detector circuit for generating a signal when the interception period of the a.c. input exceeds a first setting time; and an oscillation stopping circuit for stopping the operation of the oscillator circuit for a second setting time in response to the signal from the detector circuit, and when the a.c. input is supplied at the time other than while the operation of the oscillator circuit is being stopped for the second setting time in response to the signal from the detector circuit, directly starting the operation of the oscillator circuit after a lapse of at least the second setting time after the time when the a.c. input was supplied.
Abe Shigeo
Mikami Toshio
Beha Jr. William H.
Toko Kabushiki Kaisha
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