POWER MANAGEMENT CIRCUITRY FOR ELECTRONIC DOOR LOCKS
First Claim
1. A power management circuit for an electronic door lock, the circuit comprising:
- a ON/OFF circuit operably connected to generate an initial enable signal in response to a detected keycard;
a load switch circuit having an operating state determined by the initial enable signal, wherein in response to the initial enable signal representing a detected keycard the load switch circuit is enabled to provide a dc output voltage, wherein if no initial enable signal is present the load switch circuit is disabled such that no dc output voltage is provided; and
an electronic door lock circuit operably connected to receive dc power when the load switch circuit is enabled, wherein the electronic door lock circuit receives identification input from a keycard reader and generates in response an output that is provided to a locking mechanism, wherein in response to completing a keycard detection operation the electronic door lock circuit generates a turn-off signal that is provided in feedback to the ON/OFF circuit to disable the load switch circuit.
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Accused Products
Abstract
A power management circuit decreases power consumption in an electronic door lock. The power management circuit includes an ON/OFF circuit, a load switch circuit and a electronic door lock circuit. The ON/OFF circuit generates an initial enable signal in response to a detected keycard that places the load switch circuit in an enabled state. When enabled, the load switch circuit provides dc power to the electronic door lock circuit that allows the electronic door lock circuit to receive identification input from the detected keycard and determine whether an output should be generated to actuate the door lock mechanism. Having completed the keycard detection operation, the electronic door lock circuit generates a self turn-off signal that is provided as feedback to the ON/OFF circuit to disable the load switch circuit. When disabled, the load switch circuit prevents any power from being provided to the electronic door lock circuit and thereby conserves energy otherwise consumed by the electronic door lock in times between activations.
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Citations
23 Claims
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1. A power management circuit for an electronic door lock, the circuit comprising:
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a ON/OFF circuit operably connected to generate an initial enable signal in response to a detected keycard; a load switch circuit having an operating state determined by the initial enable signal, wherein in response to the initial enable signal representing a detected keycard the load switch circuit is enabled to provide a dc output voltage, wherein if no initial enable signal is present the load switch circuit is disabled such that no dc output voltage is provided; and an electronic door lock circuit operably connected to receive dc power when the load switch circuit is enabled, wherein the electronic door lock circuit receives identification input from a keycard reader and generates in response an output that is provided to a locking mechanism, wherein in response to completing a keycard detection operation the electronic door lock circuit generates a turn-off signal that is provided in feedback to the ON/OFF circuit to disable the load switch circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for managing power consumption for a electronic door lock, the method comprising:
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operating an electronic door lock circuit in a no-power mode in which a load switch circuit is disabled to prevent power from being supplied to the electronic door lock circuit; detecting a keycard while the electronic door lock circuit remains in the no-power mode; enabling the load switch circuit to supply power to the electronic door lock circuit in response to the detected keycard; determining whether the electronic door lock should be unlocked based on data retrieved from the keycard; and generating a self turn-off signal that is provided as feedback by the electronic door lock circuit to disable the load switch circuit and return the electronic door lock to the no-power mode. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. An electronic door lock comprising:
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a keycard reader for accepting a keycard and reading data stored on the accepted keycard; a switch located in the keycard reader that is closed in response to a keycard placed in the keycard reader; a load switch circuit having an operating state determined by a signal applied to an enable pin of the load switch circuit, wherein a detected keycard results in a dc input being communicated through the closed switch to the enable pin to enable the load switch circuit, wherein the load switch provides a dc output when in the enabled state and no output when in a disable state; and an microcontroller connected to receive dc power from the enabled load switch circuit, wherein the microcontroller provides a dc output to the enable pin of the load switch circuit to maintain the load switch circuit in an enabled state after the keycard has been removed from the keycard reader, wherein the microcontroller receives identification input from the keycard reader and generates in response an output that is provided to a locking mechanism, wherein in response to completing a keycard detection operation the microcontroller generates a self turn-off signal by removing the dc output provided to the enable pin of the load switch circuit to disable the load switch circuit and remove subsequent power from the microcontroller. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification