| CPC G07C 9/00944 (2013.01) [E05B 47/0002 (2013.01); G07C 9/00309 (2013.01); E05B 2047/0048 (2013.01)] | 10 Claims |
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1. A locking system for a portal to enable its authorized user aware on unlawful opening of such portal, the locking system comprising:
an electronic lock for secured internal installing on a fixed portion of the portal;
an auxiliary resonator for mounting on a movable portion of the portal, the auxiliary resonator is configured to wirelessly interact with the electronic lock and one or more of electronic keys;
each electronic key on close proximity with the auxiliary resonator is wirelessly energized for communication with the electronic lock via the auxiliary resonator including transmission of unique embedded code of the electronic key to the electronic lock; and
the electronic lock involves a processor unit to match and authenticate the electronic key code by matching the electronic key code with pre-programmed codes and generate status of portal opening without electronic key or with electronic key but without matching key code;
at least one authentication cum open-close sensor in the electronic lock for wireless interaction with the electronic key on proximity with the auxiliary resonator involving the auxiliary resonator as passive repeater, while a change in wireless interaction between the auxiliary resonator and the authentication cum open-close sensor as the auxiliary resonator moves sufficiently far away from the authentication cum open-close sensor facilitates determination of open-close condition of the portal;
wherein the authentication cum open-close sensor comprises:
a resonant circuit comprising of a multi-turn planar spiral inductor and a parallel capacitor, the inductor generates a magnetic field directed to the auxiliary resonator for mutual inductance based power transfer and wireless communication with the auxiliary resonator involving mutual inductance between the inductor of the authentication cum open-close sensor and the inductor of the auxiliary resonator and further mutual inductance based power transfer and wireless communication with the electronic key involving the mutual inductance between the inductor of the auxiliary resonator and inductor of the electronic key;
a cooperative transistor based tuned amplifier having the transistor under common base/common gate configuration and a radio frequency source capable of amplitude modulation to excite the transistor, enabling transfer of power and transmission of data from the authentication cum open-close sensor to the electronic key via the auxiliary resonator, wherein data from the electronic key is transmitted to the authentication cum open-close sensor via the auxiliary resonator by load modulation including modulation of effective RF load at collector/drain of the transistor and modulation of the RF voltage at the collector/drain of the transistor;
an envelope detector to generate envelope of the RF voltage containing the load modulation information and also a DC component depending on distance and orientation of the electronic key with respect to the inductor of the auxiliary resonator;
an adaptive slicer to recover the load modulation information irrespective of the DC component and convert to digital data equivalent to the data generated by the electronic key:
a cooperative comparator to generate logic level signal depending on the voltage from the envelope detector indicating the door open/close condition created by moving the auxiliary resonator sufficiently far away from the resonant circuit of the authentication cum open-close sensor;
wherein the processor unit, on detection of the portal opening through said at least one authentication cum open-close sensor without receiving the key code or without matching of the received key code with any of the pre-programmed codes, generates an audio alarm signal and send warning message to one or more of authorized users of the portal using a wireless network.
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