Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1988-09-08
1990-03-13
Zazworsky, John
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307310, 307491, 324235, 324251, 338 32H, 357 27, H03K 1797, H03K 1790
Patent
active
049085271
ABSTRACT:
A transducer in the form of an integrated circuit comprising a Hall cell, first and second differential amplifiers, an output driver stage, a threshold voltage-generating circuit between said amplifiers, and a control circuit for selectively enabling and disabling the threshold voltage-generating circuit. The second amplifier provides an output signal representative of the enabled-disabled condition of the threshold voltage-generating circuit. A permanent magnet having a temperature coefficient is movable with respect to the transducer between given field-applying and field-removing positions. The transducer operates to change switching states between "operate" and "release" in response to the two different levels of applied magnetic fields, respectively, resulting from the two given operating positions of the magnet. The transducer also has a temperature coefficient at its "operate" point which substantially tracks that of the magnet, thereby rendering the transducer operation essentially independent of ambient temperature changes.
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Xolox Corporation
Zazworsky John
LandOfFree
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