Detection of an led module
US-2015373811-A1 · Dec 24, 2015 · US
Semiconductor light source lighting circuit
US8947017B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8947017-B2 |
| Application number | US-201213644517-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 4, 2012 |
| Priority date | Oct 6, 2011 |
| Publication date | Feb 3, 2015 |
| Grant date | Feb 3, 2015 |
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- Title
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Abstract
Official abstract text for this publication.
A circuit for lighting a semiconductor light source is provided. The circuit includes: a switching regulator including a switching element and configured to generate a drive current for the semiconductor light source using the switching element; and a control circuit configured to control on-off of the switching element such that the magnitude of the drive current comes close to a targeted value. The control circuit includes: a comparator configured to compare the magnitude of the drive current with the targeted value; an up/down counter configured to count a digital value in a counting-up direction or counting-down direction, based on a comparison result of the comparator; a digital-to-analog converter configured to convert the counted digital value into an analog signal; and a drive circuit configured to control on/off of the switching element based on the analog signal.
First claim
Opening claim text (preview).
What is claimed is: 1. A circuit for lighting a semiconductor light source, the circuit comprising: a switching regulator comprising a switching element and configured to generate a drive current for the semiconductor light source from an input voltage using the switching element, wherein the input voltage varies between a first voltage corresponding to an active state of the switching regulator and a second voltage corresponding to an inactive state of the switching regulator rep…
Assignees
Inventors
Classifications
- H05B45/50Primary
Electricity · mapped topic
- H05B33/089Primary
Electricity · mapped topic
Electricity · mapped topic
Electricity · mapped topic
Electricity · mapped topic
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Frequently asked questions
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- What does patent US8947017B2 cover?
- A circuit for lighting a semiconductor light source is provided. The circuit includes: a switching regulator including a switching element and configured to generate a drive current for the semiconductor light source using the switching element; and a control circuit configured to control on-off of the switching element such that the magnitude of the drive current comes close to a targeted valu…
- Who is the assignee on this patent?
- Kikuchi Satoshi, Shiotsu Fuminori, Namba Takanori, and 2 more
- What technology area does this patent fall under?
- Primary CPC classification H05B45/50. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Feb 03 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).