Solid-State Lighting Operable With Compact Fluorescent Ballasts And AC Mains
AssigneeLightel Technologies, Inc.
InventorChungho Hsia
Life of this patent
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Abstract
A light-emitting diode (LED)-based solid-state lamp using an LED driving circuit with an electric current control operates normally for a regulated power from either a compact fluorescent (CFL) electronic ballast or AC mains. The LED driving circuit together with a matching circuit is configured to optimize resonant characteristics of the CFL electronic ballast used and enhance lamp compatibility without flickering, which in turn reduces possibility of overheating and fires due to incompatibility. With a cycle-by-cycle current control and power switching at a constant on-time and varied off-time, an over-rated surge current is limited, preventing occasional fire hazards occurred in both the CFL electronic ballast and the LED lamp.
Claims18
A light-emitting diode (LED) lamp, comprising:
- a plurality of LED printed circuit boards (LED PCBs);
- a light emission portion comprising LED arrays disposed on the plurality of LED PCBs;
- a lamp base portion connected to the light emission portion, the lamp base portion comprising electrical connection terminals;
- an electrical adapter connected to the electrical connection terminals;
- at least one bridge rectifier connected to the electrical adapter, the at least one bridge rectifier configured to convert an alternating-current (AC) input voltage into a direct-current (DC) voltage;
- and
- an LED driving circuit configured to receive the DC voltage from the at least one bridge rectifier coupled with AC mains or a compact fluorescent (CFL) electronic ballast, the LED driving circuit comprising an electric current control circuit, a switch controlled by the electric current control circuit, a current sensing resistor, a diode, an inductor with its current charging and discharging controlled by the switch, and an output capacitor connected to the inductor to power up the LED arrays,
- wherein, responsive to detecting a zero current in the inductor, the electric current control circuit generates a signal to turn on the switch.
Dependencies are inferred from the claim text.