Device for detecting line-disconnection in stepping motor...

Details Device for detecting line-disconnection in stepping motor... Device for detecting line-disconnection in stepping motor...

2007-11-20

2007-11-20

Nguyen, Tai (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S660000, C340S661000, C340S664000, C340S691800, C318S696000, C318S794000

Reexamination Certificate

active

11178030

ABSTRACT:
A device for detecting disconnection for use in a stepping motor driver is provided having a driver circuit3which comprises a pair of windings21, 22wound in a bifilar turn arrangement; a pair of MOSFETs1, 2connected to the other end of each winding21, 22; a common current detecting resistor4connected between MOSFETs1, 2and ground; a first reference voltage generator34for producing a first reference voltage Vt1; a second reference voltage generator40for producing a second reference voltage Vt2lower than first reference voltage Vt1; a decision circuit8, 8bfor comparing the detection voltage on current detecting resistor4with second reference voltage Vt2to produce an alarm signal when detection voltage is higher than second reference voltage Vt2; and a disconnection detector11for receiving an alarm signal from decision circuit8, 8bafter comparator8produces a chopper signal17to produce a disconnection signal upon occurrence of line-disconnection in winding21or22.

REFERENCES:
patent: 5656910 (1997-08-01), Erckert
patent: 5786641 (1998-07-01), Nakanishi et al.

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