Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1988-02-25
1990-09-11
Beha, Jr., William H.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 21, 363 97, 323222, H02M 3338
Patent
active
049567616
ABSTRACT:
A switching power source apparatus of a ringing choke converter system according to the present invention includes an amplifier for outputting a voltatge to be decreased with an increase in output voltage from a switching power source apparatus, an oscillator for generating a sawtooth wave voltage, a comparator for comparing the sawtooth wave voltage output from the oscillator with the detection output voltage from the amplifier, a first control transistor for controlling the oscillator, and a second control transistor for controlling the switching transistor. When the sawtooth wave voltage is lower than the detection output voltage, the first control transistor is turned on, and the oscillator is subsequently turned on. When the sawtooth wave voltage is higher than the detection output voltage, the second control transistor is turned on, and the switching transistor is subsequently turned on. As a result, the switching frequency is set constant by decreasing the duty ratio in the small load period.
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Beha Jr. William H.
Kabushiki Kaisha Toshiba
Voeltz Emanual Todd
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