Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1995-02-16
1995-12-26
Nguyen, Matthew V.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 19, 363 21, H02M 300, H02M 3335
Patent
active
054793297
ABSTRACT:
In a switching power supply, electric current is supplied through a switching device to a load located away from the switching power supply. The electric current at the load is detected by a remote detecting device at remote detecting terminals. The remote detecting device includes a differential amplifier and a comparator connected to an output terminal of the differential amplifier. The comparator compares an output voltage of the differential amplifier with a reference voltage and outputs an alarm signal when the output voltage of the differential amplifier is lower than the reference voltage. A control device is connected to the switching device, the output terminal of the remote detecting device and a first reference voltage supply device. The control device changes ON-OFF duty ratio of the switching device by comparing the output voltage of the differential amplifier with the first reference voltage to control an output voltage of the switching device at a predetermined value. A first overvoltage protecting device is connected to the control device for protecting the load from overvoltage by monitoring the output of the switching device.
REFERENCES:
patent: 4603288 (1986-07-01), Rogers
patent: 5091837 (1992-02-01), Duspiva et al.
patent: 5383106 (1995-01-01), Yoshida et al.
patent: 5406468 (1995-04-01), Booth
patent: 5408402 (1995-04-01), Nonnenmacher
patent: 5412555 (1995-05-01), Uramoto
Kobayashi Yasuo
Motonobu Masahiro
Ueki Koichi
Fuji Electric & Co., Ltd.
Nguyen Matthew V.
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