Load drive circuit, light emitting diode driver, and display device
US-2024397595-A1 · Nov 28, 2024 · US
Apparatus for controlling series-connected light emitting diodes
US9693413B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9693413-B2 |
| Application number | US-47373909-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 28, 2009 |
| Priority date | Nov 10, 2006 |
| Publication date | Jun 27, 2017 |
| Grant date | Jun 27, 2017 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
An apparatus for controlling an LED-based lighting system includes a comparison circuit configured to compare at least one signal representative of a supply voltage with at least one other signal representative of a series voltage drop over at least some of a plurality of LEDs connected electrically in series. The apparatus includes a controller, connected to the comparison circuit; and a power section connected to the controller. The power section is configured to operate at least one switch such that the number of LEDs operated in series may be changed in response to the comparison circuit.
First claim
Opening claim text (preview).
What is claimed is: 1. An apparatus for controlling an LED system, the apparatus comprising: a comparison circuit configured to compare at least one signal representative of a supply voltage with at least one other signal representative of a series voltage drop over at least some of a plurality of LEDs connected electrically in series; a controller, connected to the comparison circuit and configured to determine a number of the plurality of LEDs that can be energized based on an input from the comparison circuit, wherein the input is based on the comparison of the representative signal of the supply voltage with the at least one other signal representative of the series voltage drop over at least some of the plurality of LEDs; and a power section connected to the controller, the power section being configured to operate at least one switch so that the number of LEDs determined by the controller is energized. 2. An apparatus as claimed in claim 1 , wherein the apparatus comprises a single integrated circuit. 3. An apparatus as claimed in claim 2 , wherein the LEDs are disposed over the single integrated circuit. 4. An apparatus as claimed in claim 1 , wherein the apparatus comprises the LEDs in a package. 5. An apparatus as claimed in claim 4 , wherein the package comprises a single package. 6. A method of controlling an LED system comprising a plurality of LEDs, the method comprising: comparing at least one signal representative of a supply voltage with at least one other signal representative of a series voltage drop over at least some of a plurality of LEDs connected electrically in series; determining a number of the plurality of LEDs that can be energized based on the comparing; and operating at least one switch so that the number of the plurality of LEDs is energized.
Assignees
Inventors
Classifications
Controlling the colour of the light · CPC title
- H05B45/48Primary
having LEDs organised in strings and incorporating parallel shunting devices · CPC title
- H05B33/0857Primary
Electricity · mapped topic
Electricity · mapped topic
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Frequently asked questions
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- What does patent US9693413B2 cover?
- An apparatus for controlling an LED-based lighting system includes a comparison circuit configured to compare at least one signal representative of a supply voltage with at least one other signal representative of a series voltage drop over at least some of a plurality of LEDs connected electrically in series. The apparatus includes a controller, connected to the comparison circuit; and a power…
- Who is the assignee on this patent?
- Lys Ihor, Philips Lighting Holding Bv
- What technology area does this patent fall under?
- Primary CPC classification H05B45/48. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jun 27 2017 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).