Interface isolation and selection circuit for a local area netwo

Electricity: power supply or regulation systems – Remote sensing

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Details

323902, 307140, 36494891, 364DIG2, G06F 126

Patent

active

054045452

ABSTRACT:
An improved interface isolation and selection circuit for a local area network. The invention includes a power supply effective to provide an isolated output voltage. An opto-isolator transforms a first control signal to a second control signal effective to activate the interface. The opto-isolator includes an optical emitter for providing an optical signal in response to the first control signal and an optical detector for receiving the optical signal and providing the second control signal in response thereto. The second control signal is effective to activate the interface by applying the isolated power thereto. In particular implementations, the isolated power and the power for the opto-isolator are provided by a single power supply and a field effect transistor is activated by the opto-isolator and, in turn, activates the interface.

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patent: 4641233 (1987-02-01), Roy
patent: 4870340 (1989-09-01), Kral
patent: 4933825 (1990-06-01), Allington et al.
patent: 4965710 (1990-10-01), Pelly et al.
patent: 5003192 (1991-03-01), Beigel
patent: 5285367 (1994-02-01), Keller

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