Circuit for detecting short-circuiting of inductive load drive d

Details Circuit for detecting short-circuiting of inductive load drive d Circuit for detecting short-circuiting of inductive load drive d

1992-04-08

1994-08-23

Voeltz, Emanuel T.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

323222, 307132E, 361 18, 361 87, 361 93, G05F 1573

Patent

active

053412826

ABSTRACT:
An inductive load drive device which has a switch defining an output terminal connectable to an inductive load between the output terminal and a reference potential line is provided. A first current recirculating branch is connectable parallel to the load and a control opens and closes the switch so that the load is supplied with current rising to a first predetermined value in a first increasing phase and falling to a second predetermined value in a first recirculating phase. The device detects a short-circuit between the output terminal of the control device and the reference potential line with a first current sensor for detecting current flow in the first recirculating branch during the first recirculating phase. A fault signaling circuit connected to the first current sensor produces a short-circuit signal in the absence of current in the first recirculating branch during the first recirculating phase.

REFERENCES:
patent: 4441136 (1984-04-01), Hampshire
patent: 4451778 (1984-05-01), Fischer et al.
patent: 4479161 (1984-10-01), Henrich et al.
patent: 4809122 (1989-02-01), Fitzner
patent: 4893211 (1990-01-01), Bynum et al.
patent: 4945358 (1990-07-01), Wrzesinski
patent: 4949211 (1990-08-01), Edwards

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