Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1983-02-15
1986-01-21
Rowland, James L.
Communications: electrical
Condition responsive indicating system
Specific condition
310 68R, 340639, 34081531, 363 53, G08B 2100
Patent
active
045659982
ABSTRACT:
A diode failure detecting device in a rotary rectifier having fuses provided respectively for phases and connected in series to rectifying diodes. Light emitting diode circuits in one embodiment are connected in parallel respectively to the fuses which are arranged on the peripheral surface of a rotor. The LED's preferably emit light in different emission spectra when the respective fuses are blown out. An optical fiber sensor is provided on the side of a stator, for detecting when the LED's emit light and a photo-electric converter converts optical signals applied thereto through the optical fiber sensor into electrical signals through optical spectral discrimination separately according to the phases of the rectifier. A logic circuit determines the flow of over-current in the rectifying diodes from an output of the photo-electric converter. In a second embodiment, flags on the fuses are optically scanned to determine the presence of a blow fuse. By determining the absence of a pulse or determining pulse width, the detection of a flag is made. If the reflectivities of the flags vary, identification of a particular blown fuse can be made.
REFERENCES:
patent: 3532873 (1970-10-01), Batson et al.
patent: 3538312 (1970-11-01), Genahr
Iike Masanori
Nakamura Keijiro
Tsuji Nobuhiko
Fuji Electric Company Limited
Myer Daniel
Rowland James L.
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