G - Physics – 01 – R
Patent
G - Physics
01
R
324/58, 321/77
G01R 31/00 (2006.01) H02H 7/125 (2006.01)
Patent
CA 1204820
DIODE FAILURE DETECTING DEVICE IN ROTARY RECTIFIER ABSTRACT OF DISCLOSURE 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 discrimi- nation 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 embodi- ment, flags on the fuses are optically scanned to determine the presence of a blown fuse. By determin- ing the absence of a pulse or determining pulse width, the detection of a flag is made. If the reflectivi- ties of the flags vary, identification of a particular blown fuse can he made.
430718
Iike Masanori
Nakamura Keijiro
Tsuji Nobuhiko
Fuji Electric Co. Ltd.
Riches Mckenzie & Herbert Llp
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