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US 6,663,248 B2Granted
Driving circuit for LED lamps
OwnerChin-Mu Hsiehinventor
Life of this patent
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Abstract
A driving circuit for LED lamps includes a DC power unit, a control unit connected to a bank of LEDs, and a backup power unit. The DC power unit outputs DC power to the control unit, the bank of LEDs, and the backup power unit. When DC power from the DC power unit is interrupted, the backup power unit outputs DC power to the bank of LEDs. The driving circuit may be incorporated into various lamp types, including wall lamps, indicator lamps, and emergency lamps.
Claims8
A driving circuit for an LED lamp comprising:
- a DC power unit for outputting DC power;
- a control unit selectively connected between the DC power unit and a bank of parallel connected LEDs, the control unit including:
- a transistor;
- a resistor connected between the DC power unit and the transistor to provide a biasing voltage to the transistor;
- an LED connected to the transistor and the resistor;
- and,
- a zener diode connected to the LED and the transistor;
- and,
- a backup power unit connected to the DC power through the control unit and connected to the LEDs, wherein the backup power unit is recharged by the power unit through the control unit, and the backup power unit outputs DC power to the LEDs when DC power from the DC power unit is interrupted.
6 more elements
Dependencies are inferred from the claim text.