Back to results
US 9,954,390 B2Granted
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).
Claims15
A ballast assembly comprising:
- a ballast circuit to supply power to a load, wherein the ballast circuit is supplied with a line voltage via a switch;
- a battery charger circuit to charge a battery, wherein the battery charger circuit is coupled to the battery and the switch;
- a controllable inverter coupled to the battery, the battery charger circuit, and the load, wherein the controllable inverter includes a storage device, wherein the controllable inverter:
- (1) does not supply power to the load before the storage device is changed from a first state to a second state by the battery charger circuit once the battery charger circuit is first energized by the line voltage;
- (2) does not supply power to the load when the battery charger circuit supplies a first voltage to the controllable inverter;
- and
- (3) supplies power to the load when after the storage device is in the second state the battery charger circuit supplies a second voltage to the controllable inverter.
4 more elements
A method comprising:
- coupling a charged battery to a battery charger circuit and a controllable inverter of a ballast assembly before supplying line voltage to the battery charger circuit and a ballast circuit of the ballast assembly, wherein the ballast circuit and the controllable inverter are coupled to a load;
- having the controllable inverter not supply power to the load before a storage device of the controllable inverter is changed from a first state to a second state by the battery charger circuit once the battery charger circuit is coupled to a line voltage;
- having the controllable inverter not supply power to the load when the battery charger circuit supplies a first voltage to the controllable inverter;
- having the controllable inverter supply power to the load when after the storage device is in the second state the battery charger circuit supplies a second voltage to the controllable inverter.
1 more element
Dependencies are inferred from the claim text.