High-precision led control circuit, method and led driver thereof
US-2015382418-A1 · Dec 31, 2015 · US
Current driver for LED diodes
US9072139B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9072139-B2 |
| Application number | US-201414154367-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 14, 2014 |
| Priority date | Jan 17, 2013 |
| Publication date | Jun 30, 2015 |
| Grant date | Jun 30, 2015 |
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Abstract
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A current driver for a string of LEDs includes a first series connection of a first transistor and a first resistance and a second series connection of a second transistor and a second resistance. The first and second series connections are coupled in parallel between the string of LEDs and a voltage reference. An operational amplifier selectively drives the first and second transistors in response to a clock signal. A switch device driven by the clock signal alternately applies a reference voltage and a respective one of the voltages across the first and second resistances to inverting and non-inverting inputs of the operational amplifier in response to the clock signal. A storage circuit is coupled to the output of the operational amplifier to store the drive signals for the first and second transistors for application to the first and second transistors in the absence of output from the operational amplifier.
First claim
Opening claim text (preview).
What is claimed is: 1. A current driver for an LED diode having a first terminal coupled to a supply node and having a second terminal, comprising: a first series connection of a first transistor and a first resistance, a second series connection of a second transistor and a second resistance, said first and second series connections being arranged in parallel to each other and directly connected between said second terminal of said LED diode and a voltage reference node, an…
Assignees
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Electricity · mapped topic
Electricity · mapped topic
Electricity · mapped topic
Electricity · mapped topic
- H05B33/0815Primary
Electricity · mapped topic
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Frequently asked questions
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- What does patent US9072139B2 cover?
- A current driver for a string of LEDs includes a first series connection of a first transistor and a first resistance and a second series connection of a second transistor and a second resistance. The first and second series connections are coupled in parallel between the string of LEDs and a voltage reference. An operational amplifier selectively drives the first and second transistors in resp…
- Who is the assignee on this patent?
- St Microelectronics Srl
- What technology area does this patent fall under?
- Primary CPC classification H05B33/0815. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jun 30 2015 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).