GB2585300A - Dimming control circuit, controlling method and lighting equipment - Google Patents
Dimming control circuit, controlling method and lighting equipment Download PDFInfo
- Publication number
- GB2585300A GB2585300A GB2013293.2A GB202013293A GB2585300A GB 2585300 A GB2585300 A GB 2585300A GB 202013293 A GB202013293 A GB 202013293A GB 2585300 A GB2585300 A GB 2585300A
- Authority
- GB
- United Kingdom
- Prior art keywords
- voltage
- dimming
- control circuit
- reference voltage
- input port
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
Abstract
A dimming control circuit, a controlling method and a lighting equipment.. The dimming control circuit includes: a dimming signal input port (X2-c), configured to receive a dimming signal; a resistor string, configured to connect the dimming signal input port and ground; a controller, configured to compare a first voltage and a second voltage, and output a control signal according to a comparing result, the first voltage is provided by the resistor string, the second voltage is generated based on a driving current provided to a lighting device, the control signal is used for generating the driving current; a reference voltage providing circuit, configured to provide the resistor string with a first reference voltage when the voltage of the dimming signal is below a predetermined voltage. Therefore, the output power of the lighting device could be constant when the dimming signal is below the predetermined voltage.
Claims (10)
1. A dimming control circuit, comprising: a dimming signal input port (X2-c) , configured to receive a dimming signal; a resistor string, configured to connect the dimming signal input port and ground; a controller, configured to compare a first voltage and a second voltage, and output a control signal according to a comparing result, wherein, the first voltage is provided by the resistor string, the second voltage is generated based on a driving current provided to a lighting device, the control signal is used for generating the driving current; a reference voltage providing circuit, configured to provide the resistor string with a first reference voltage when the voltage of the dimming signal is below a predetermined voltage.
2. The dimming control circuit according to claim 1, wherein, the first reference voltage is provided according to an internal reference voltage of the controller.
3. The dimming control circuit according to claim 2, wherein, the controller comprises a reference input port, configured to be provided with the internal reference voltage, the reference voltage providing circuit connects the reference input port and a first connecting node of the resistor string.
4. The dimming control circuit according to claim 3, wherein, the reference voltage providing circuit comprises more than two diodes, which connect in series between the reference input port and the first co nnecting node.
5. The dimming control circuit according to claim 3, wherein, the controller further comprises: a first input port, configured to connect to a second connecting node of the resistor string; a second input port, configured to input the second voltage; and a first output port, configured to output the control signal.
6. The dimming control circuit according to claim 1, wherein, the first reference voltage is provided according to an external voltage i nput to the controller.
7. The dimming control circuit according to claim 6, wherein, the reference voltage providing circuit comprising at least two resisters and at least one diode, wherein, the at least two resisters connect in series between an input port of the external voltage and ground, the at least one diode connects between a first connecting node of the res istor string and a connecting node of the at least two resisters.
8. A lighting equipment, comprises a current generator, a lighting device, and the dimming control circuit according to one of claims 1-7, wherein: the dimming control circuit outputs the control signal according to the di mming signal and the driving current, the current generator generates the driving current according to the contr ol signal, the lighting device is provided with the driving current.
9. A controlling method of a dimming control circuit, comprising: receiving a dimming signal, via a dimming signal input port (X2-c) ; comparing a first voltage and a second voltage, and outputting a control signal according to a comparing result, wherein, the first voltage is provided by the resistor string which connects the d imming signal input port and ground, the second voltage is generated based on a driving current provided to a lighting device, the control signal is used for generating the driving current; and providing the resistor string with a first reference voltage when the volt age of the dimming signal is below a predetermined voltage.
10. The controlling method of a dimming control circuit according to claim 9, wherein, the first reference voltage is provide according to an internal reference voltage of the controller, or the first reference voltage is provided according to an external voltage i nput to the controller.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2018/077490 WO2019165587A1 (en) | 2018-02-28 | 2018-02-28 | Dimming control circuit, controlling method and lighting equipment |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB202013293D0 GB202013293D0 (en) | 2020-10-07 |
| GB2585300A true GB2585300A (en) | 2021-01-06 |
| GB2585300B GB2585300B (en) | 2022-05-11 |
Family
ID=67804744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2013293.2A Active GB2585300B (en) | 2018-02-28 | 2018-02-28 | Dimming control circuit, controlling method and lighting equipment |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB2585300B (en) |
| WO (1) | WO2019165587A1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201307950Y (en) * | 2008-05-21 | 2009-09-09 | 深圳市阳光富源科技有限公司 | Multi-stage dimming control circuit for LED streetlight |
| CN201639821U (en) * | 2010-02-01 | 2010-11-17 | 佛山市伊戈尔电业制造股份有限公司 | Dimming control circuit of LED lamp |
| TWI390299B (en) * | 2008-09-25 | 2013-03-21 | Chimei Innolux Corp | Backlight module and display including dimming control circuit |
| TWI467548B (en) * | 2012-08-10 | 2015-01-01 | Innocom Tech Shenzhen Co Ltd | Backlight module and driving method thereof |
-
2018
- 2018-02-28 GB GB2013293.2A patent/GB2585300B/en active Active
- 2018-02-28 WO PCT/CN2018/077490 patent/WO2019165587A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201307950Y (en) * | 2008-05-21 | 2009-09-09 | 深圳市阳光富源科技有限公司 | Multi-stage dimming control circuit for LED streetlight |
| TWI390299B (en) * | 2008-09-25 | 2013-03-21 | Chimei Innolux Corp | Backlight module and display including dimming control circuit |
| CN201639821U (en) * | 2010-02-01 | 2010-11-17 | 佛山市伊戈尔电业制造股份有限公司 | Dimming control circuit of LED lamp |
| TWI467548B (en) * | 2012-08-10 | 2015-01-01 | Innocom Tech Shenzhen Co Ltd | Backlight module and driving method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| GB202013293D0 (en) | 2020-10-07 |
| GB2585300B (en) | 2022-05-11 |
| WO2019165587A1 (en) | 2019-09-06 |
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