CONSTANT CURRENT LED LAMP
First Claim
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1. A constant current LED lamp provided with a driver circuit for driving multiple LEDs, or LED packages that comprise multiple chips, connected in series, the driver circuit comprising:
- a rectifier circuit for receiving an alternating current power and converting the alternating current power into a direct current power;
a stable voltage circuit connected to the rectifier circuit and adapted for receiving the direct current power and for generating a constant voltage; and
a constant current circuit connected to the stable voltage circuit, and having a transistor and a second resistor connected in series with each other, and connected in series with the LEDs to allow a constant driving current to flow through the LEDs.
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Abstract
A constant current LED lamp is provided with a linear driver circuit for driving multiple light emitting diodes (LEDs), or LED packages comprise multiple LED chips, connected in series. The driver circuit includes a rectifier circuit, a stable voltage circuit, and a constant current circuit. The driver circuit allows the aggregate forward voltage drop of all the LEDs connected in series to approach the rectified input voltage to efficiently utilize the AC power from the mains.
10 Citations
16 Claims
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1. A constant current LED lamp provided with a driver circuit for driving multiple LEDs, or LED packages that comprise multiple chips, connected in series, the driver circuit comprising:
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a rectifier circuit for receiving an alternating current power and converting the alternating current power into a direct current power; a stable voltage circuit connected to the rectifier circuit and adapted for receiving the direct current power and for generating a constant voltage; and a constant current circuit connected to the stable voltage circuit, and having a transistor and a second resistor connected in series with each other, and connected in series with the LEDs to allow a constant driving current to flow through the LEDs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification