Apparatus and method for driving LED
US-9084323-B2 · Jul 14, 2015 · US
Light emitting device driver circuit and driving method of light emitting device circuit
US9307612B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9307612-B2 |
| Application number | US-201514728554-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 2, 2015 |
| Priority date | Jun 11, 2014 |
| Publication date | Apr 5, 2016 |
| Grant date | Apr 5, 2016 |
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Abstract
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The present invention discloses a light emitting device driver circuit and a driving method of a light emitting device circuit. The light emitting device driver circuit is for driving a light emitting device circuit with plural light emitting devices connected in series. The light emitting device driver circuit determines a number of the conductive light emitting devices according to a rectified input voltage. The light emitting device driver circuit includes: a switch module, a current source circuit, and a total harmonic distortion (THD) compensation circuit. The THD compensation circuit generates an adjustment current according to the rectified input voltage. The current source circuit provides a light emitting device current to the light emitting device circuit according to the adjustment current, such that the THD is reduced.
First claim
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What is claimed is: 1. A light emitting device driver circuit configured to operably drive a light emitting device circuit which is operative according to a rectified input voltage, the light emitting device circuit including a plurality of light emitting devices connected in series, the plural light emitting devices being divided into a plurality of groups, wherein each group includes at least one light emitting device, the light emitting device driver circuit comprising: a switc…
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Frequently asked questions
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- What does patent US9307612B2 cover?
- The present invention discloses a light emitting device driver circuit and a driving method of a light emitting device circuit. The light emitting device driver circuit is for driving a light emitting device circuit with plural light emitting devices connected in series. The light emitting device driver circuit determines a number of the conductive light emitting devices according to a rectifie…
- Who is the assignee on this patent?
- Jao Tong-Cheng, Chen Isaac Y, Lee Yi-Wei, and 1 more
- What technology area does this patent fall under?
- Primary CPC classification H05B37/00. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Apr 05 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).