Lighting device
First Claim
1. A method of controlling a lighting apparatus comprising one or more light sources, a primary input power connection for receiving primary power from a primary power supply, for powering a light source, a secondary input power connection for receiving secondary power from a secondary power supply, for powering a light source, the method comprising:
- controlling power delivery to the one or more light sources using power received at the input power connections, such that in the event of a power failure, power from the secondary power supply is used for powering a light source;
sensing an external impedance connected to the primary input power connection by applying measurement pulses to the primary input power connection to obtain an impedance measure of the external impedance;
said sensing including applying a measurement pulse to the primary input power connection and measuring a decaying transient signal on the primary input power connection resulting from applying the measurement pulse to the primary input power connection;
determining whether a manually operable switch coupled to the primary input power connection is in an open state or a closed state using said measure of the external impedance; and
wherein the controlling step controls the power delivery in dependence upon a result of said determining.
1 Assignment
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Accused Products
Abstract
In one embodiment of lighting devices and lighting systems, the lighting device has a connection for connecting to a primary power supply and has a secondary power supply, such as a battery. A measuring circuit is operable to measure an impedance of the primary power supply connection and to determine from the measurement if a main power supply has failed, and if so whether to power light sources using power from the secondary power supply.
46 Citations
41 Claims
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1. A method of controlling a lighting apparatus comprising one or more light sources, a primary input power connection for receiving primary power from a primary power supply, for powering a light source, a secondary input power connection for receiving secondary power from a secondary power supply, for powering a light source, the method comprising:
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controlling power delivery to the one or more light sources using power received at the input power connections, such that in the event of a power failure, power from the secondary power supply is used for powering a light source; sensing an external impedance connected to the primary input power connection by applying measurement pulses to the primary input power connection to obtain an impedance measure of the external impedance;
said sensing including applying a measurement pulse to the primary input power connection and measuring a decaying transient signal on the primary input power connection resulting from applying the measurement pulse to the primary input power connection;determining whether a manually operable switch coupled to the primary input power connection is in an open state or a closed state using said measure of the external impedance; and wherein the controlling step controls the power delivery in dependence upon a result of said determining. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A lighting control apparatus comprising:
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a primary input power connection for connection to a primary power supply; 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 sensing circuitry configured to sense an external impedance coupled to the primary input power connection, wherein the sensing circuitry is arranged to apply measurement pulses to the primary input power connection to obtain an impedance measure of the external impedance, and wherein said sensing circuitry is arranged to apply a measurement pulse to the primary input power connection and to measure a decaying transient signal on the primary input power connection, and wherein the electronic circuitry is arranged to make a determination whether a manually operated switch coupled to the primary input power connection is in an open state or a closed state using the impedance measure and to control power delivery to the one or more light sources in dependence upon the determination. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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Specification