Lighting device
First Claim
1. A lighting control apparatus comprising:
- a primary input power connection for connection to a primary power supply circuit external to the lighting control apparatus;
a secondary input power connection for receiving secondary power from a secondary power supply; and
electronic circuitry arranged to control power delivery to one or more light sources;
wherein the electronic circuitry comprises;
control circuitry for controlling delivery of power from said input power connections to one or more light sources; and
sensing circuitry configured to sense and obtain a measure of impedance of the external primary power supply circuit that is coupled, in use, to the primary input power connection by applying one or more voltage or current pulses to the primary input power connection;
wherein the control circuitry is arranged to determine a present operating state of the one or more light sources;
wherein the control circuitry is arranged to determine a new operating state of the one or more light sources using the determined present operating state of the one or more light sources and the measure of said impedance obtained from the sensing circuitry;
wherein the control circuitry is arranged to control delivery of power to the one or more light sources in dependence upon the determined new operating state of the one or more light sources; and
wherein the control circuitry is configured to control delivery of power to the one or more light sources dependent of presence of primary power at the primary input power connection such that if the determined operating state of the one or more light sources is off, then the control circuitry does not deliver power to the one or more light sources even when primary power for powering the one or more light sources is available at the primary input power connection.
1 Assignment
0 Petitions
Accused Products
Abstract
A lighting control includes a primary and a secondary input power connection for connection to a primary (mains) and a secondary (battery) power supply respectively, control circuitry for controlling delivery of power from the input power connections to one or more light sources, sensing circuitry configured to sense an external impedance coupled, in use, to the primary input power connection and a controller for determining a present operating state of the one or more light sources. The controller includes a latching module adapted to maintain a state information indicating the present operating state of the one or more light sources. The control circuitry is operable to control delivery of power to the one or more light sources in dependence upon the sensed impedance measure and the determined operating state. The lighting devices may be installed in a conventional lighting circuit that uses momentary toggle switches.
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Citations
23 Claims
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1. A lighting control apparatus comprising:
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a primary input power connection for connection to a primary power supply circuit external to the lighting control apparatus; a secondary input power connection for receiving secondary power from a secondary power supply; and electronic circuitry arranged to control power delivery to one or more light sources; wherein the electronic circuitry comprises; control circuitry for controlling delivery of power from said input power connections to one or more light sources; and sensing circuitry configured to sense and obtain a measure of impedance of the external primary power supply circuit that is coupled, in use, to the primary input power connection by applying one or more voltage or current pulses to the primary input power connection; wherein the control circuitry is arranged to determine a present operating state of the one or more light sources; wherein the control circuitry is arranged to determine a new operating state of the one or more light sources using the determined present operating state of the one or more light sources and the measure of said impedance obtained from the sensing circuitry; wherein the control circuitry is arranged to control delivery of power to the one or more light sources in dependence upon the determined new operating state of the one or more light sources; and wherein the control circuitry is configured to control delivery of power to the one or more light sources dependent of presence of primary power at the primary input power connection such that if the determined operating state of the one or more light sources is off, then the control circuitry does not deliver power to the one or more light sources even when primary power for powering the one or more light sources is available at the primary input power connection. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method of controlling power delivery to one or more light sources using a control apparatus, the method comprising:
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connecting a primary input power connection of the control apparatus to a primary power supply circuit that is external of the control apparatus; connecting a secondary input power connection of the control apparatus to a secondary power supply; sensing and obtaining a measure of impedance of the external power supply circuit that is connected to the primary input power connection by applying one or more voltage pulses or current pulses to the primary input power connection; using control circuitry of the control apparatus to determine a present operating state of the one or more light sources; using the control circuitry of the control apparatus to determine a new operating state of the one or more light sources, and using the determined present operating state of the one or more light sources and the measure of said impedance obtained from said sensing; and controlling delivery of power to the one or more light sources in dependence upon the determined operating state of the one or more light sources; wherein the controlling controls delivery of power to the one or more light sources independent of the presence of primary power of the primary input power connection such that if the determined operating state of the one or more light sources is off, then the controlling does not deliver power to the one or more light sources even when primary power for powering the one or more light sources is available at the primary input power connection.
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Specification