Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1992-12-04
1995-04-04
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361186, H01H 4700
Patent
active
054042623
ABSTRACT:
A counter electromotive force due to electromagnetic induction is generated on interruption of a current if an actuator 10 is in a normal state. An output signal generated by the counter electromotive force and a pulse signal which is generated from the fall of an input signal applied to the electronic switch are applied to an AND logical circuit 90 to determine whether or not the actuator is defective.
REFERENCES:
patent: 4661766 (1987-04-01), Hoffman et al.
patent: 5029040 (1991-07-01), Ito et al.
patent: 5053911 (1991-10-01), Kopec et al.
patent: 5175663 (1992-12-01), Iwabuchi et al.
Enomoto Takashi
Kunimi Takashi
Gaffin Jeffrey A.
Nihon Inter Electronics Corporation
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