Drive circuit for a bidirectional flow control valve

Details Drive circuit for a bidirectional flow control valve Drive circuit for a bidirectional flow control valve

1995-07-11

1997-11-04

Masih, Karen

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318439, 363 58, 361 1, H02K 2300

Patent

active

056843712

ABSTRACT:
A normal-direction mode which switches on first and fourth switches and in a mutually diagonal relationship of an H-type bridge circuit and switches off second and third switches also in a mutually diagonal relationship of the bridge circuit is executed for an on-duty time of an opening-degree command signal, and a reverse-direction mode which switches off the first and fourth switches and switches off the second and third switches is executed for an off-duty time of the opening-degree command signal. During normal operation, conduction of current to the H-type bridge circuit 70 and a coil is constantly performed irrespective of a degree of opening of a valve to be adjusted, and in a case where conduction is interrupted, it can be presumed that a broken wire has occurred in the H-type bridge circuit or coil, and determination of a broken wire can be made.

REFERENCES:
patent: 3551747 (1970-12-01), Joslyn
patent: 4169990 (1979-10-01), Ledman
patent: 5450756 (1995-09-01), Kirii et al.
Patent Abstract of Japan, vol. 15, No. 49 (M-1078) Nov. 1990 re JP-A-02-283837.

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