Circuit arrangement for the identification of vehicles
First Claim
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1. A circuit arrangement for vehicle identification, particularly a transponder for transmitting an encoded signal in response to an interrogation signal, comprising:
- a tuning circuit for controlling said transponder having first, second, and third tapping points; and
gating means for activating said transponder upon reception of said interrogation signal, comprising terminals for connection of a battery, and two transistors of opposite type connected in series between said terminals, said transistors having emitter electrodes connected to said first point of said tuning circuit, base electrodes connected to each other and to said second point of said tuning circuit, said third point being connected to one of said terminals.
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Abstract
A vehicle identification circuit arrangement with battery power supply in which the transmitting oscillator of a reply station which is modulated according to an identification code is normally cut off and starts to oscillate in reaction to an interrogation signal, the power supply for the remainder of the circuit then being switched on via a gate.
15 Citations
3 Claims
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1. A circuit arrangement for vehicle identification, particularly a transponder for transmitting an encoded signal in response to an interrogation signal, comprising:
- a tuning circuit for controlling said transponder having first, second, and third tapping points; and
gating means for activating said transponder upon reception of said interrogation signal, comprising terminals for connection of a battery, and two transistors of opposite type connected in series between said terminals, said transistors having emitter electrodes connected to said first point of said tuning circuit, base electrodes connected to each other and to said second point of said tuning circuit, said third point being connected to one of said terminals.
- a tuning circuit for controlling said transponder having first, second, and third tapping points; and
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2. An arrangement as defined in claim 1 wherein said tuning circuit is frequency modulated.
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3. An arrangement as defined in claim 1, further comprising a field-effect transistor, and an associated capacitor connected in series;
- said field effect transistor and capacitor serving to frequency modulate said tuning circuit.
Specification
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Current AssigneeNicolaas Van Tol
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Original AssigneeNicolaas Van Tol
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InventorsVan Tol, Nicolaas
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Primary Examiner(s)Hubler, Malcolm F.
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Application NumberUS05/433,770Time in Patent Office657 DaysField of Search343/6.5SS,6.8LC,6.8RUS Class Current342/51CPC Class CodesB61L 25/04 Indicating or recording tra...B61L 25/043 using inductive tagsG06K 19/0705 the battery being connected...G08G 1/017 identifying vehicles G08G1/...
