CN208029151U - A kind of LED drive circuit - Google Patents
A kind of LED drive circuit Download PDFInfo
- Publication number
- CN208029151U CN208029151U CN201820455134.6U CN201820455134U CN208029151U CN 208029151 U CN208029151 U CN 208029151U CN 201820455134 U CN201820455134 U CN 201820455134U CN 208029151 U CN208029151 U CN 208029151U
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- Prior art keywords
- led
- driving circuit
- circuit
- green
- light group
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Classifications
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- 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]
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
-
- 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]
- H05B45/30—Driver circuits
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Led Devices (AREA)
- Control Of El Displays (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The utility model discloses a kind of LED drive circuit, including the first power supply and second source, the first driving circuit and the second driving circuit, the first LED light group and the second LED light group；First power supply drives the first LED light group by the first driving circuit；Second source drives the second LED light group by the second driving circuit；First LED light group is red LED lamp set, and second LED light group is green and/or blue led lamp group；First driving circuit is red LED driving circuit, and the second driving circuit is green and/or blue led driving circuit.By two groups of power supplys different voltages are provided from green and/or blue led to red LED respectively, reduce the voltage on red LED driving circuit, so that the voltage on red LED driving circuit is consistent with the voltage on green and/or blue led driving circuit, advantageously reduce the fever and decaying of red LED driving circuit, improve the stability of red LED driving circuit, and PCB design is simplified, there is good economic and social benefit.
Description
Technical field
The utility model is related to driving circuit field, more particularly to a kind of LED drive circuit.
Background technology
With LED display extensive use in the market, LED display electricity consumption is big, and the high problem that consumes energy is shown
Come.At present in LED product, as shown in Figure 1, type of drive is generally electric current from positive pole, driven by PMOS tube, LED, constant current
Dynamic circuit flows to power cathode (driving circuit is driving chip).Since the chip physical property of red, green, blue is different each other, red LED
Forward conduction voltage it is relatively low, when for the same power supply power supply, due to PMOS tube both end voltage Vmos, LED both end voltage
Vled is fixed forward conduction voltage, causes the voltage on the constant-current drive circuit of red LED than green and/or blue led
Constant-current drive circuit on voltage it is high, cause the fever of red LED driving circuit serious, red LED because local temperature difference is larger, than
Green and/or blue led decaying faster, lead to drive circuit area color pastiness.If being used for a long time, reliability, stability are deposited
In problem.
Utility model content
In order to solve the above-mentioned technical problem, the purpose of this utility model is to provide a kind of LED drive circuit, passes through two groups of electricity
Source provides different voltages to red LED from green and/or blue led respectively, to reduce the electricity on red LED driving circuit
Pressure.
Technical solution used by the utility model is：
A kind of LED drive circuit, which is characterized in that including the first power supply and second source, the first driving circuit and second
Driving circuit, the first LED light group and the second LED light group；
First power supply drives the first LED light group by the first driving circuit；
The second source drives the second LED light group by the second driving circuit；
First LED light group is red LED lamp set, and second LED light group is green and/or blue led lamp group；
First driving circuit is red LED driving circuit, and second driving circuit is green and/or blue led
Driving circuit.
Preferably, further include first switch circuit and second switch circuit；
The first switch circuit is used to control the on off state of the first LED light group；
The second switch circuit is used to control the on off state of the second LED light group.
As the utility model preferably the first embodiment, first power supply and first switch circuit, red LED
Lamp group, red LED driving circuit are sequentially connected；The second source and second switch circuit, green and/or blue led lamp group,
Green and/or blue led driving circuit are sequentially connected.
As the utility model preferably second of embodiment, first power supply and red LED driving circuit, red
LED light group, first switch circuit are sequentially connected；The second source with green and/or blue led driving circuit, green and/or
Blue led lamp group, second switch circuit are sequentially connected.
Preferably, the voltage value of first power supply is 4.3V, and the voltage value of the second source is 5V.
Preferably, the first switch circuit and second switch circuit include switch controller and switching transistor, institute
On off state of the switch controller for controlling switching transistor is stated, to control the on off state of corresponding LED light group.
Preferably, the switching transistor is NMOS tube.
The utility model has the beneficial effects that：By making improvement in existing LED type of drive, two groups of power supplys are provided
Different voltages are provided from green and/or blue led to red LED respectively, reduce the voltage on red LED driving circuit,
So that the voltage on red LED driving circuit is consistent with the voltage on green and/or blue driving circuit, overcomes and deposit in the prior art
Red LED driving circuit overtension, fever is serious, decaying faster the technical issues of, realize a kind of LED drivings electricity
Road advantageously reduces fever and energy consumption, improves the stability of red LED, and simplifies PCB design, has good economy
And social benefit.
Description of the drawings
Specific embodiment of the present utility model is described further below in conjunction with the accompanying drawings：
Fig. 1 is the type of drive of LED in the prior art；
Fig. 2 is the electrical block diagram of the utility model basic conception；
Fig. 3 a and Fig. 3 b are the circuit diagrams of the first embodiment of the utility model；
Fig. 4 a and Fig. 4 b are the circuit diagrams of second of embodiment of the utility model.
Specific implementation mode
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.
As shown in Figure 1, at present in LED product, type of drive is generally electric current from positive pole, by PMOS tube, LED,
Constant-current drive circuit flows to power cathode.Since the chip physical property of red, green, blue is different each other, the forward conduction voltage of red LED
It is relatively low, when powering for the same power supply VCC, due to PMOS tube both end voltage Vmos, LED both end voltage Vled be it is fixed just
To conducting voltage, cause the voltage on the constant-current drive circuit of red LED than green and/or the constant-current drive circuit of blue led
On voltage it is high, cause the fever of red LED driving circuit serious, red LED is because local temperature difference is larger, than green and/or blue
LED decays faster, leads to drive circuit area color pastiness.
For example, when being powered using the power supply VCC that voltage value is 5V, the forward conduction voltage Vled1 of red LED is 1.8V,
The forward conduction voltage Vled2 of green and/or blue led is 2.5V, and the fixed voltage Vmos of PMOS tube is 1V, then red LED
Voltage on driving circuit is VCC-Vmos-Vled1=5V-1.8V-1V=2.2V, in green and/or blue led driving circuit
Voltage be VCC-Vmos-Vled2=5V-2.5V-1V=1.5V.Voltage i.e. on red LED driving circuit than green and/or
Voltage on blue led driving circuit is high, causes the fever of red LED driving circuit serious, and faster, safety is used for a long time in decaying
There are problems with reliability.
As shown in Fig. 2, the basic conception of the present invention is：A kind of LED drive circuit, including the first power supply and the second electricity are provided
Source, the first driving circuit and the second driving circuit, the first LED light group and the second LED light group；First power supply passes through the first driving electricity
Road drives the first LED light group；Second source drives the second LED light group by the second driving circuit；First LED light group is red
LED light group, the second LED light group are green and/or blue led lamp group；First driving circuit be red LED driving circuit, second
Driving circuit is green and/or blue led driving circuit.
It is as shown in Figure 3a and Figure 3b shows the circuit diagram of the first embodiment of the utility model, including the first power supply
VCC1, second source VCC2, first switch circuit, second switch circuit, red LED lamp set, green and/or blue led lamp group,
Red LED driving circuit, green and/or blue led driving circuit.
Wherein, as shown in Figure 3a, the first power supply VCC1 and first switch circuit, red LED lamp set, red LED driving electricity
Road is sequentially connected, first switch circuit include 1 NMOS tube and 1 controller, controller be used for control NMOS tube conducting and
Cut-off, to control the on and off of red LED lamp set；As shown in Figure 3b, second source VCC2 and second switch circuit, green
And/or blue led lamp group, green and/or blue led driving circuit are sequentially connected, second switch circuit include 1 NMOS tube and
1 controller, controller are used for controlling the on and off of NMOS tube, to control green and/or blue led lamp group open and
It closes.
Further, the drain electrode of NMOS tube is connect with the first power supply VCC1, and the anode of source electrode and red LED lamp set connects
It connects, grid is connect with controller.
NMOS is compared compared with PMOS, there is less spontaneous heating so that more power shine for LED, therefore the present embodiment
Select NMOS tube as switching circuit.
Since the forward conduction voltage value of red LED is less than the forward conduction voltage value of green and/or blue led,
If the voltage wanted on two driving circuits is identical, the voltage value of the first power supply VCC1 should be less than the voltage of second source VCC2
Value.In the present embodiment, the voltage value of setting power supply VCC1 is 4.3V, and the voltage value of power supply VCC2 is 5V, the positive guide of red LED
The pressure that is powered is 1.8V, and green and/or blue led forward conduction voltage is 2.5V, and the fixed voltage of NMOS tube is 1V, then red
Voltage on LED drive circuit is 4.3V-1.8V-1V=1.5V, and the voltage in green and/or blue led driving circuit is 5V-
2.5V-1V=1.5V.Compared with prior art, the voltage on red LED driving circuit is reduced so that red LED driving circuit
On voltage with green and/or blue led driving circuit on voltage it is consistent.
It is the circuit diagram of second of embodiment of the utility model, including the first power supply as shown in figures 4 a and 4b
VCC1, second source VCC2, red LED driving circuit, green and/or blue led driving circuit, red LED lamp set, green
And/or blue led lamp group, first switch circuit, second switch circuit.
Wherein, as shown in fig. 4 a, the first power supply VCC1 and red LED driving circuit, red LED lamp set, first switch electricity
Road is sequentially connected, first switch circuit include 1 NMOS tube and 1 controller, controller be used for control NMOS tube conducting and
Cut-off, to control the on and off of red LED lamp set；As shown in Figure 4 b, second source VCC2 drives with green and/or blue led
Dynamic circuit, green and/or blue led lamp group, second switch circuit are sequentially connected, and second switch circuit includes 1 NMOS tube and 1
A controller, controller are used for controlling the on and off of NMOS tube, to control green and/or blue led lamp group open and
It closes.
Further, the cathode of the drain electrode of NMOS tube and red LED lamp set connects, source electrode ground connection, grid and controller
Connection.
NMOS is compared compared with PMOS, there is less spontaneous heating so that more power shine for LED, therefore the present embodiment
Select NMOS tube as switching circuit.
In addition, three groups of power supplys can also be used respectively to red LED, green LED, blue led power supply in the utility model, wherein
It is less than the supply voltage powered to green LED and blue led to the supply voltage of red LED power supply, gives green LED and blue
The supply voltage of LED power supplies is equal.The voltage on reduction red LED driving circuit can also so be reached to reduce fever
Purpose.
The prior art compared to Fig. 1, on the one hand, the utility model is changed by being made in existing LED type of drive
Into, by two groups of power supplys respectively to red LED from green and/or blue led improve different voltages, reduce red LED drive
Voltage on dynamic circuit so that the voltage on red LED driving circuit and the voltage on green and/or blue led driving circuit
Unanimously, the fever of red LED driving circuit is advantageously reduced, and the voltage on red LED driving circuit reduces, and improves red
The stability of color LED drive circuit efficiently solves the ghost image and caterpillar phenomenon of LED display.Meanwhile using identical cost
LED, accomplish same brightness, as a result of lower voltage, reduce the power of LED display.On the other hand, this reality
Two groups of power supply power supplies are used with novel, twice of metal-oxide-semiconductor is not needed and two kinds of voltage driving LED can be used, simplify PCB design.
It is to be illustrated to the preferable implementation of the utility model, but the invention is not limited to the reality above
Example is applied, those skilled in the art can also make various equivalent variations without departing from the spirit of the present invention
Or replace, these equivalent deformations or replacement are all contained in the application claim limited range.
Claims (7)
1. a kind of LED drive circuit, which is characterized in that including the first power supply and second source, the first driving circuit and second drives
Dynamic circuit, the first LED light group and the second LED light group；
First power supply drives the first LED light group by the first driving circuit；
The second source drives the second LED light group by the second driving circuit；
First LED light group is red LED lamp set, and second LED light group is green and/or blue led lamp group；
First driving circuit is red LED driving circuit, and second driving circuit is green and/or blue led driving
Circuit.
2. a kind of LED drive circuit according to claim 1, which is characterized in that further include first switch circuit and second
Switching circuit；
The first switch circuit is used to control the on off state of the first LED light group；
The second switch circuit is used to control the on off state of the second LED light group.
3. a kind of LED drive circuit according to claim 2, which is characterized in that first power supply and first switch electricity
Road, red LED lamp set, red LED driving circuit are sequentially connected；The second source and second switch circuit, green and/or indigo plant
Color LED light group, green and/or blue led driving circuit are sequentially connected.
4. a kind of LED drive circuit according to claim 2, which is characterized in that first power supply drives with red LED
Circuit, red LED lamp set, first switch circuit are sequentially connected；The second source with green and/or blue led driving circuit,
Green and/or blue led lamp group, second switch circuit are sequentially connected.
5. according to a kind of LED drive circuit of claim 1-4 any one of them, which is characterized in that the electricity of first power supply
Pressure value is 4.3V, and the voltage value of the second source is 5V.
6. a kind of LED drive circuit according to claim 2, which is characterized in that the first switch circuit and second is opened
Powered-down road includes switch controller and switching transistor, and the switch controller is used to control the switch shape of switching transistor
State, to control the on off state of corresponding LED light group.
7. a kind of LED drive circuit according to claim 6, which is characterized in that the switching transistor is NMOS tube.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820455134.6U CN208029151U (en) | 2018-04-02 | 2018-04-02 | A kind of LED drive circuit |
| PCT/CN2018/095165 WO2019192099A1 (en) | 2018-04-02 | 2018-07-10 | Led display screen and led display system |
| PCT/CN2018/095166 WO2019192100A1 (en) | 2018-04-02 | 2018-07-10 | Led drive circuit and led display apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820455134.6U CN208029151U (en) | 2018-04-02 | 2018-04-02 | A kind of LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208029151U true CN208029151U (en) | 2018-10-30 |
Family
ID=63908930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820455134.6U Active CN208029151U (en) | 2018-04-02 | 2018-04-02 | A kind of LED drive circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN208029151U (en) |
| WO (2) | WO2019192100A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021012848A1 (en) * | 2019-07-22 | 2021-01-28 | 深圳蓝普科技有限公司 | Energy-saving power supply circuit for led display screen and display screen |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116189608B (en) * | 2022-02-16 | 2023-08-04 | 北京大学 | Method for eliminating phenomena of caterpillar and smear and improving refresh rate of LED display screen |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2279680Y (en) * | 1997-01-30 | 1998-04-22 | 重庆南岸长星光电子厂 | Whole-colour electronic lattice displaying device |
| CN202018810U (en) * | 2011-04-29 | 2011-10-26 | 深圳市达特工程技术有限公司 | LED display device |
| CN103854596A (en) * | 2012-11-29 | 2014-06-11 | 利亚德光电股份有限公司 | Led display |
| US9258861B2 (en) * | 2013-02-02 | 2016-02-09 | Vastview Technology Inc. | Apparatus for driving multi-color LED strings |
| US9336704B2 (en) * | 2013-10-18 | 2016-05-10 | Sct Technology, Ltd. | Apparatus and method for powering LED driver |
| CN103929852A (en) * | 2014-03-31 | 2014-07-16 | 深圳市九洲光电科技有限公司 | LED lamp with light and color capable of being adjusted |
| CN105913796B (en) * | 2016-06-13 | 2019-01-22 | 深圳君略科技有限公司 | Driving circuit, driving method and the LED drive chip of LED display |
| CN206601943U (en) * | 2017-01-20 | 2017-10-31 | 深圳市易事达电子有限公司 | Led display circuit and display screen |
| CN206821054U (en) * | 2017-06-15 | 2017-12-29 | 乐健科技（珠海）有限公司 | LED light adjusting circuits and LED module |
-
2018
- 2018-04-02 CN CN201820455134.6U patent/CN208029151U/en active Active
- 2018-07-10 WO PCT/CN2018/095166 patent/WO2019192100A1/en active Application Filing
- 2018-07-10 WO PCT/CN2018/095165 patent/WO2019192099A1/en active Application Filing
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021012848A1 (en) * | 2019-07-22 | 2021-01-28 | 深圳蓝普科技有限公司 | Energy-saving power supply circuit for led display screen and display screen |
| CN112349239A (en) * | 2019-07-22 | 2021-02-09 | 深圳蓝普科技有限公司 | Energy-saving power supply circuit of LED display screen and display screen |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019192099A1 (en) | 2019-10-10 |
| WO2019192100A1 (en) | 2019-10-10 |
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