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Generators or Motors

Blown-fuse-sensor

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Blown fuse sensor

Details

Inventors: Ishibashi, Naoto; Taniguti, Ryosuke; Miyaji, Junichi; Ichinose, Yosaburo;
Assignee: Mitsubishi Denki Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Robinson; Thomas A.
Assistant Examiner: Myer; Daniel
Attorney, Agent or Firm: Wenderoth, Lind & Ponack

Each arm forming a three-phase full wave rectifier bridge includes a semiconductor diode, a current transformer and a fuse. The current transformer is connected to a pulse extinction indicator circuit through a pulse transformer. When no current flows through the arm for a predetermined time or more, the pulse extinction detection circuit produces a DC signal indicating the blowing of the fuse. The rectifier bridge, the current transformers, the fuses and the pulse extinction detection circuit are all disposed on the rotor of a brushless synchronous machine.

DETAILED DESCRIPTION The present invention provides a blown fuse sensor device comprising a series circuit including a fuse, a current detector means connected in the series circuit to detect the current flowing through the series circuit, a converter means responsive to an output from the current detector means to produce a pulse signal, and a signal generator means for generating a signal indicating the blowing of the fuse when a pulse signal from the converter means is not applied thereto for at least a predetermined time interval.

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