Security system to enable authenticated access of an individual to a protected area
First Claim
1. A security system to enable authenticated access of an individual to a protected area comprising a remote control unit, carried by the individual, containing a transponder that on reception of an interrogation signal transmits an identification code group, and a control unit, located within the protected area which, when activated by the individual, transmits the interrogation signal and then checks the identification code group sent by the transponder, allowing access for the individual to the protected area only after positive verification of the authorisation to access, and wherein the transponder contained in the remote control unit is a passive transponder which obtains a supply voltage from the interrogation signal transmitted by the control unit and feeds this into a supply voltage rail, wherein the remote control unit contains a battery which, by means of a controllable battery coupling switch, can be connected to the supply voltage rail via a high-resistance path when the remote control unit is in a quiescent state, or via a low-resistance path when the remote control unit is in its operative state, wherein a pulse detector is provided which receives its supply voltage via the high-resistance path of the battery coupling switch when the remote control unit is in its quiescent state, which, on reception of the interrogation signal from the transponder, outputs a recognition signal, wherein a field-detector is provided which receives the signal and outputs a remote-field signal as soon as the recognition signal comes within a pre-determined range, wherein a logic circuit is provided which, on reception of the remote-field signal, outputs a switching signal to the battery coupling switch which switches this into the state where the battery is connected to the supply voltage rail via the low-resistance path, and outputs an activation signal to the transponder which will cause its transmitting unit to transmit the identification code group, and wherein a nearfield detector is provided which, on recognising a value of the supply voltage produced by the transponder exceeding a predetermined threshold value, outputs a nearfield signal that causes the logic circuit to put the battery coupling switch into the state prevailing in the quiescent state of the remote control unit and to transmit the activation signal to the transponder.
2 Assignments
0 Petitions
Accused Products
Abstract
A security system to enable authenticated access of an individual to a protected area, including a remote control unit (22) with a transponder (28), carried by the individual, which transmits an identification code group on reception of an interrogation signal. A control unit located within the protected area transmits an interrogation signal when activated by the individual, and verifies the identification code group received from the transponder. Access to the protected area will only be permitted on positive verification of the right to access. The transponder (28), contained within the remote control unit (22), is a passive transponder which obtains a supply voltage from the interrogation signal transmitted by the control unit (16) and then feeds this to a supply voltage rail. The remote control unit (22) contains a battery (34) that can be connected to the supply voltage rail (46) by means of a controllable battery coupling switch (42)via a high-resistance path when the remote control unit (22) is in its quiescent state, or via a low-resistance path when the remote control (22) unit is in its active state.
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Citations
11 Claims
- 1. A security system to enable authenticated access of an individual to a protected area comprising a remote control unit, carried by the individual, containing a transponder that on reception of an interrogation signal transmits an identification code group, and a control unit, located within the protected area which, when activated by the individual, transmits the interrogation signal and then checks the identification code group sent by the transponder, allowing access for the individual to the protected area only after positive verification of the authorisation to access, and wherein the transponder contained in the remote control unit is a passive transponder which obtains a supply voltage from the interrogation signal transmitted by the control unit and feeds this into a supply voltage rail, wherein the remote control unit contains a battery which, by means of a controllable battery coupling switch, can be connected to the supply voltage rail via a high-resistance path when the remote control unit is in a quiescent state, or via a low-resistance path when the remote control unit is in its operative state, wherein a pulse detector is provided which receives its supply voltage via the high-resistance path of the battery coupling switch when the remote control unit is in its quiescent state, which, on reception of the interrogation signal from the transponder, outputs a recognition signal, wherein a field-detector is provided which receives the signal and outputs a remote-field signal as soon as the recognition signal comes within a pre-determined range, wherein a logic circuit is provided which, on reception of the remote-field signal, outputs a switching signal to the battery coupling switch which switches this into the state where the battery is connected to the supply voltage rail via the low-resistance path, and outputs an activation signal to the transponder which will cause its transmitting unit to transmit the identification code group, and wherein a nearfield detector is provided which, on recognising a value of the supply voltage produced by the transponder exceeding a predetermined threshold value, outputs a nearfield signal that causes the logic circuit to put the battery coupling switch into the state prevailing in the quiescent state of the remote control unit and to transmit the activation signal to the transponder.
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10. A security system to enable authenticated access of an individual to a protected area comprising:
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a remote control unit carried by the individual, the remote control unit containing passive transponder;
a pulse detector coupled to a battery in the remote control unit by a high resistance path for receiving an interrogation signal transmitted by a control unit for the protected area, the pulse detector coupling a logic circuit to decode the interrogation signal and transmit an identification code to the battery by a low resistance path;
a response circuit for the protected area that provides access to the individual on receipt of the identification code.
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11. A remote control unit comprising:
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a passive transponder;
a pulse detector coupled to a battery in the remote control unit by a high resistance path for receiving an interrogation signal;
the pulse detector coupling a logic circuit to decode the interrogation signal and to transmit identification code to the battery by a low resistance path.
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Specification