Switching device actuated by a transponder

Details Switching device actuated by a transponder Switching device actuated by a transponder

2007-04-24

2007-04-24

Kinkead, Arnold (Department: 2817)

Oscillators

Solid state active element oscillator

Transistors

C331S167000, C340S540000, C340S542000, C340S545400, C340S010100, C340S870030

Reexamination Certificate

active

10504779

ABSTRACT:
Proposed is a device actuated by a transponder for the generation of a switch signal. The device is based on an oscillating circuit (10) with a capacitance (C1), an identification coil (L1) and an oscillator amplifier (12). Connected to the oscillating circuit (10) is a frequency observer (20) which evaluates the frequency (f1) tuned in the oscillating circuit (10) and which when finding a change emits a switch signal (S). A change of the frequency in the oscillating circuit (10) is effected by the approach of a transponder (60). The device permits a nearly loadless transponder identification.

REFERENCES:
patent: 6150948 (2000-11-01), Watkins
patent: 6703920 (2004-03-01), Zimmer
patent: 198 55 207 (2000-05-01), None
patent: 1 024 451 (2000-08-01), None
patent: 11-066444 (1999-03-01), None

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