CN202455610U - Constant current light-emitting diode (LED) driver - Google Patents
Constant current light-emitting diode (LED) driver Download PDFInfo
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- CN202455610U CN202455610U CN2012200178246U CN201220017824U CN202455610U CN 202455610 U CN202455610 U CN 202455610U CN 2012200178246 U CN2012200178246 U CN 2012200178246U CN 201220017824 U CN201220017824 U CN 201220017824U CN 202455610 U CN202455610 U CN 202455610U
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Abstract
The utility model provides a constant current light-emitting diode (LED) driver. For reducing working temperature of an LED light source, working current of an LED driving circuit is reduced in the prior art, but the characteristics of the LED light source cannot be given full play, and simultaneously the LED driver having no light adjusting function needs full-power output even if the LED light source is not needed so that resources are severely wasted. The constant current LED driver comprises a data transmission controller, a data latch, a gray level comparator, a switch, an output end, an over temperature protective end, a counting device and a power-on reset device, wherein the data transmission controller, the data latch, the gray level comparator, the switch and the output end are sequentially connected, the over temperature protective end is connected with the output end, the counting device is connected with the gray level comparator, and the power-on reset device is connected with the data transmission controller and the data latch. The constant current LED driver can provide output current hardly changing along with change of the output voltage, and 256-level LED gray control can be achieved easily.
Description
Technical field
The utility model relates to lighting field, relates in particular to a kind of constant-current LED driver.
Background technology
Along with the fast development of semiconductor lighting industry, LED is efficient with it, the theory of environmental protection more and more receives people's attention.LED can be applied to the LED display of indoor and outdoor, have good luck screen and LED decorative lighting system.In this case, often a led driver need go to drive a plurality of LED demonstrations.As everyone knows, high temperature is the important factor that restriction LED uses at lighting field to the influence in led light source life-span.In order to reduce the working temperature of led light source; Conventional at present way is to reduce the operating current of led drive circuit; Its shortcoming is to give full play to the characteristic of led light source; Simultaneously, the led driver that does not possess dimming function can make led light source also want full power output when not required immediately, is a kind of serious wasting of resources.
The utility model content
To the existing technical problem of led driver; The utility model provides a kind of constant-current LED driver, and this driver has 18 passages, 256 grades of gray scale adjustings, constant currents are exported, and is fit to very much be applied to the occasion of needs cascade; Such as display screen, the application such as screen and LED guardrail fluorescent tube of having good luck.To achieve these goals; The technical scheme that the utility model is taked does; A kind of constant-current LED driver comprises Data Transmission Control Unit, data latches, gray scale comparator, switch, output, overheat protector end, counting device, electrification reset; Wherein, Data Transmission Control Unit, data latches, gray scale comparator, switch, output are connected successively; The overheat protector end is connected with output; Counting device is connected with the gray scale comparator; Electrification reset is connected with Data Transmission Control Unit, data latches; Data Transmission Control Unit is 8 * 18bit shift register; Data latches comprises 18 groups of gradation datas, and the gray scale comparator comprises 18 the tunnel, and switch comprises 18 the tunnel, and output comprises 18 the tunnel, and its each road gradation data, gray scale comparator, switch, output are corresponding one by one; The overheat protector end comprises output current adjustment and overheat protector, and overheat protector feeds back to the output current adjustment; Counting device comprises 1.2MHz sheet internal oscillator, 8-bit counter, and both are connected successively for it; Each road output is connected with an adjustable resistance.
The utility model provides a kind of constant-current LED driver that an output current that changes with output voltage hardly can be provided, and output current can be set by an external resistance.The gray-scale Control Frame is made up of 18 gradation data words, and each data word is made up of 8bit gradation data position, altogether 144bit.The gradation data of 8bit is to realize 256 grades LED gray-scale Control very easily.
Description of drawings
Fig. 1 is the structural representation of the utility model;
Fig. 2 is the utility model SOP-28 encapsulating structure sketch map;
Fig. 3 is the utility model DIP-28 encapsulating structure sketch map;
The communication protocol sketch map that Fig. 4 adopts for the utility model lock.
Among the figure: 1, Data Transmission Control Unit, 2, data latches, 3, the gray scale comparator, 4, switch, 5, output, 6, the overheat protector end, 7, counting device, 8, electrification reset.
Embodiment
Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.
Fig. 1 is the structural representation of the utility model, Data Transmission Control Unit 1, data latches 2; Gray scale comparator 3, switch 4, output 5; Overheat protector end 6, counting device 7, electrification reset 8; Wherein, Data Transmission Control Unit 1, data latches 2, gray scale comparator 3, switch 4, output 5 are connected successively; Overheat protector end 6 is connected with output 5; Counting device 7 is connected with gray scale comparator 3; Electrification reset 8 is connected with Data Transmission Control Unit 1, data latches 2; Data Transmission Control Unit 1 is 8 * 18bit shift register; Data latches 2 comprises 18 groups of gradation datas, and gray scale comparator 3 comprises 18 the tunnel, and switch 4 comprises 18 the tunnel, and output 5 comprises 18 the tunnel, and its each road gradation data, gray scale comparator 3, switch 4, output 5 are corresponding one by one; Overheat protector end 6 comprises output current adjustment and overheat protector, and overheat protector feeds back to the output current adjustment; Counting device 7 comprises 1.2MHz sheet internal oscillator, 8-bit counter, and both are connected successively for it; Each road output is connected with an adjustable resistance.The utility model provides a kind of constant-current LED driver that an output current that changes with output voltage hardly can be provided, and output current can be set by an external resistance.The gray-scale Control Frame is made up of 18 gradation data words, and each data word is made up of 8bit gradation data position, altogether 144bit.The gradation data of 8bit is to realize 256 grades LED gray-scale Control very easily.Fig. 2 is the utility model SOP-28 encapsulating structure sketch map, and the definition of each pin is following:
| Pin number | Title | Functional description | |
| 1 | | Ground | |
| 2 | NC | Do not have and connect | |
| 3 | IREF | The output current adjustment adds the resistance to ground at this pin and can adjust output current | |
| 4 | CKI | The data clock input signal | |
| 5 | SDI | The output of |
|
| 6~23 | OUT17~0 | The constant current driven |
|
| 24 | SDO | Do not have and connect | |
| 25 | CKO | Do not have and connect | |
| 26 | NC | Serial data signal output through the buffering shaping | |
| 27 | NC | Clock signal output through the buffering shaping | |
| 28 | VCC | The VCC power supply |
Fig. 3 is the utility model DIP-28 encapsulating structure sketch map, and the definition of each pin is following:
| Pin number | Title | Functional description | |
| 1 | | Ground | |
| 2 | IREF | The output current adjustment adds the resistance to ground at this pin and can adjust output current | |
| 3 | NC | Do not have and connect | |
| 4 | CKI | The data clock input signal | |
| 5 | SDI | The output of |
|
| 6~23 | OUT17~0 | The constant current driven |
|
| 24 | NC | Do not have and connect | |
| 25 | NC | Do not have and connect | |
| 26 | SDO | Serial data signal output through the buffering shaping | |
| 27 | CKO | Clock signal output through the buffering shaping | |
| 28 | VCC | The VCC power supply |
The communication protocol sketch map that Fig. 4 adopts for the utility model lock.
More than show and described basic principle of the utility model and the advantage of principal character and the utility model.The technical staff of the industry should understand; The utility model is not restricted to the described embodiments; That describes in the foregoing description and the specification just explains principle of the present invention; Under the prerequisite that does not break away from spirit and scope of the invention, the present invention also has various changes and modifications, and these variations and improvement all fall in the scope of the invention that requires protection.The utility model requires protection range to be defined by appending claims and equivalent thereof.
Claims (3)
1. a constant-current LED driver comprises Data Transmission Control Unit, data latches, gray scale comparator, switch, output, overheat protector end, counting device, electrification reset, it is characterized in that:
Described Data Transmission Control Unit, data latches, gray scale comparator, switch, output are connected successively;
Described overheat protector end is connected with output;
Described counting device is connected with the gray scale comparator;
Described electrification reset is connected with Data Transmission Control Unit, data latches.
2. a kind of constant-current LED driver according to claim 1 is characterized in that:
Described Data Transmission Control Unit is 8 * 18bit shift register;
Described data latches comprises 18 groups of gradation datas, and the gray scale comparator comprises 18 the tunnel, and switch comprises 18 the tunnel, and output comprises 18 the tunnel, and its each road gradation data, gray scale comparator, switch, output are corresponding one by one;
Described overheat protector end comprises output current adjustment and overheat protector, and overheat protector feeds back to the output current adjustment;
Described counting device comprises 1.2MHz sheet internal oscillator, 8-bit counter, and both are connected successively for it.
3. a kind of constant-current LED driver according to claim 1 is characterized in that: each Lu Yuyi of described output adjustable resistance is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200178246U CN202455610U (en) | 2012-01-16 | 2012-01-16 | Constant current light-emitting diode (LED) driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200178246U CN202455610U (en) | 2012-01-16 | 2012-01-16 | Constant current light-emitting diode (LED) driver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202455610U true CN202455610U (en) | 2012-09-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200178246U Expired - Fee Related CN202455610U (en) | 2012-01-16 | 2012-01-16 | Constant current light-emitting diode (LED) driver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202455610U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106132013A (en) * | 2016-07-14 | 2016-11-16 | 深圳市菉华半导体有限公司 | A kind of Power Carrier communication LED control method |
| CN106211433A (en) * | 2016-07-14 | 2016-12-07 | 深圳市菉华半导体有限公司 | A kind of Power Carrier communication LED control chip |
| CN106470516A (en) * | 2015-08-21 | 2017-03-01 | 上海馨晔电子科技有限公司 | Single-wire signal transmission 18mA triple channel constant-current LED drives IC |
| CN113163553A (en) * | 2021-03-11 | 2021-07-23 | 深圳市帝麦德斯科技有限公司 | 18-channel high-precision constant-current LED driving chip |
-
2012
- 2012-01-16 CN CN2012200178246U patent/CN202455610U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106470516A (en) * | 2015-08-21 | 2017-03-01 | 上海馨晔电子科技有限公司 | Single-wire signal transmission 18mA triple channel constant-current LED drives IC |
| CN106132013A (en) * | 2016-07-14 | 2016-11-16 | 深圳市菉华半导体有限公司 | A kind of Power Carrier communication LED control method |
| CN106211433A (en) * | 2016-07-14 | 2016-12-07 | 深圳市菉华半导体有限公司 | A kind of Power Carrier communication LED control chip |
| CN106211433B (en) * | 2016-07-14 | 2018-07-20 | 深圳市菉华半导体有限公司 | A kind of Power Carrier communication LED control chips |
| CN113163553A (en) * | 2021-03-11 | 2021-07-23 | 深圳市帝麦德斯科技有限公司 | 18-channel high-precision constant-current LED driving chip |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120926 Termination date: 20150116 |
|
| EXPY | Termination of patent right or utility model |