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US 2015/0380983 A1Published application
Ballast with battery backup
AssigneeFulham Company Limited
InventorsXiaohong Chen, David Ci
Life of this patent
Estimating the term…
Abstract
An emergency battery backup ballast is configured so that it can be fully assembled but in a dormant condition. The emergency battery backup ballast commences normal operation when AC power is supplied to the ballast for the first time. Then if the AC power is removed, one or more lamps (56) which are connected to the output of the ballast can be powered by the battery (54).
Claims21
1-57. (canceled)
A circuit for driving a lighting device comprising:
- a driver having an input and a load output wherein the load output is configured to be capable of providing power to a lighting load to be coupled to the load output;
- a battery backup circuit is coupled to the driver;
- and
- a control circuit is coupled to the battery backup circuit and configured to keep the battery backup circuit in a first state when the driver is disconnected from a main power source, and to place the battery backup circuit in a second state when the driver is connected to a main power source.
1 more element
A circuit for driving a lighting device, the circuit comprising:
- a lighting driver having an input and a load output wherein the load output is configured to be capable of providing power to a lighting load to be coupled to the load output;
- and
- a battery backup circuit coupled to the load output and including a hysteresis circuit for setting a voltage level in the battery backup circuit.
A method of assembling a lighting driver with a battery backup, the method comprising:
- coupling a lighting driver circuit to a battery and battery charging circuit;
- coupling a control circuit to the battery and configuring the control circuit to electrically isolate the battery from a load output circuit until after a line voltage is coupled to the assembly.
Dependencies are inferred from the claim text.