Output circuit
US-9474124-B2 · Oct 18, 2016 · US
Output circuit
US9820352B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9820352-B2 |
| Application number | US-201615269161-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 19, 2016 |
| Priority date | Dec 22, 2010 |
| Publication date | Nov 14, 2017 |
| Grant date | Nov 14, 2017 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
There is provided an output circuit for supplying an output current to a load coupled to an output terminal in response to an input signal. The output circuit includes an output transistor for supplying the output current to the output terminal, an output-drive circuit for driving the output transistor, a constant-current limiting circuit for generating a current control signal for limiting the output current to a predetermined current value, and a control circuit for implementing a control such that the output current is controlled on the basis of the current control signal if a voltage at the output terminal is at a predetermined voltage, or less after the input signal is supplied while the output transistor is driven by the output-drive circuit if the voltage at the output terminal is in excess of the predetermined voltage.
First claim
Opening claim text (preview).
What is claimed is: 1. A Light Emitting Diode (LED) drive circuit, comprising: an output circuit that outputs one of a first current and a second current to a LED circuit, the first current having a predetermined current value and the second current having a current value higher than the predetermined current value; and a short-circuit detection circuit that detects a short circuit at the LED circuit, wherein the output circuit outputs the first current based on a control signal, wherein the output circuit switches to output the second current when the short-circuit detection circuit does not detect the short circuit after the first current is outputted, wherein the output circuit switches to output the first current when the short-circuit detection circuit detects the short circuit after the second current is outputted, and wherein the output circuit switches to output the second current when the short circuit is cancelled. 2. The LED drive circuit according to claim 1 , wherein the short-circuit detection circuit detects the short circuit when a voltage of the LED drive circuit is lower than a first predetermined voltage. 3. The LED drive circuit according to claim 1 , wherein the short-circuit detection circuit detects the cancel of the short circuit when a voltage of the LED circuit is larger than a second predetermined voltage. 4. The LED drive circuit according to claim 1 , wherein the output circuit includes an output transistor, and wherein the first current and the second current are generated by the output transistor. 5. The LED drive circuit according to claim 4 , further comprising a switch circuit that is controlled by the short-circuit detection circuit, wherein the output transistor is controlled by the switch circuit.
Assignees
Inventors
Classifications
Measuring means of, e.g. currents through or voltages across the switch · CPC title
- H05B33/0887Primary
Electricity · mapped topic
- H03K17/0822Primary
in field-effect transistor switches · CPC title
Electricity · mapped topic
Electricity · mapped topic
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Frequently asked questions
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- What does patent US9820352B2 cover?
- There is provided an output circuit for supplying an output current to a load coupled to an output terminal in response to an input signal. The output circuit includes an output transistor for supplying the output current to the output terminal, an output-drive circuit for driving the output transistor, a constant-current limiting circuit for generating a current control signal for limiting the…
- Who is the assignee on this patent?
- Renesas Electronics Corp
- What technology area does this patent fall under?
- Primary CPC classification H05B33/0887. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Nov 14 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 2 related publications on this page (citations in our corpus or others sharing the same primary CPC).