Constant power supply for led emergency lighting using smart output resetting circuit for no load conditions
AssigneeABL IP Holding LLC
InventorJIE WANG
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Abstract
A constant power backup power supply for LED lighting fixtures is disclosed. The power supply includes a storage battery that is charged while an AC power source is in an ON condition. When AC power transitions to an OFF condition, a capacitor bank charged by the battery supplies current to the primary side of a flyback converter operating in discontinuous conduction mode. The secondary side of the flyback converter supplies constant output power to the LED lighting fixture for an arbitrary output voltage within a predetermined range.
Claims19
A backup power supply for driving an LED light source, the supply comprising:
- a storage battery adapted to provide DC electrical current;
- a constant power LED driver circuit comprising a flyback converter comprising a transformer having a primary inductor winding that is electrically coupled to the storage battery, and a secondary inductor winding that is selectably electrically coupled to the LED light source;
- and
- further comprising one or more capacitors electrically interposed between the primary inductor winding and the storage battery, the one or more capacitors having a capacitance sufficient to supply sufficient current to the primary inductor winding to supply constant power to the LED light source over a predetermined output voltage and power range.
A method of providing backup power to an LED light source, the method comprising:
- providing a storage battery adapted to provide DC electrical current;
- and
- providing a constant power LED driver circuit comprising a flyback converter comprising a transformer, wherein
- the flyback converter has a primary inductor winding that is electrically coupled to the storage battery, and
- the flyback converter has a secondary inductor winding that is selectably electrically coupled to the LED light source;
- and
- further comprising providing one or more capacitors electrically interposed between the primary inductor winding and the storage battery, the one or more capacitors having a capacitance sufficient to supply sufficient current to the primary inductor winding to supply constant power to the LED light source over a predetermined output voltage and power range.
Dependencies are inferred from the claim text.