CN201965888U - LED (Light Emitting Diode) screen driving device - Google Patents
LED (Light Emitting Diode) screen driving device Download PDFInfo
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- CN201965888U CN201965888U CN2010206245480U CN201020624548U CN201965888U CN 201965888 U CN201965888 U CN 201965888U CN 2010206245480 U CN2010206245480 U CN 2010206245480U CN 201020624548 U CN201020624548 U CN 201020624548U CN 201965888 U CN201965888 U CN 201965888U
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Abstract
The utility model discloses an LED (Light Emitting Diode) screen driving device, which comprises a controller and a plurality of driving modules, wherein the driving modules are connected with the controller, each driving module is connected to a light emitting diode, and the light emitting diode is connected to a power supply with the voltage less than 4V. The LED screen driving device has the advantages of reducing power supplying voltage of a big LED screen, saving electric energy, reducing the dissipation power of a driving chip, decreasing the working temperature of the driving chip, and further decreasing the system temperature and improving the system reliability.
Description
Technical field
The utility model relates to a kind of drive unit, is specifically related to a kind of LED screen drive unit.
Background technology
Existing LED big screen LED lamp all adopts the mode of 5V power supply, and at the bottom of the work of blue green LED lamp voltage at 3～3.3V, the operating voltage of red LED lamp is at 2～2.2V, LED drives and adopts constant current drive mode, so remaining voltage all is added in and is converted into heat energy on the chip for driving, so not only wastes energy but also has brought a large amount of heats to system.And the minimum voltage of existing big screen LED drive wire sheet constant current output can't adopt too low supply voltage at 1V.
The utility model content
Technical problem to be solved in the utility model provides a kind of LED screen drive unit, and it can reduce the supply voltage of LED giant-screen, saves electric energy, reduce the dissipated power of chip for driving, reduce the working temperature of chip for driving, thereby reduce system temperature, improve system reliability.
In order to solve above technical matters, the utility model provides a kind of LED screen drive unit; Comprise: controller; The a plurality of driver modules that are connected with controller; Wherein each driver module connects a light emitting diode, and described light emitting diode connects the power supply less than 4V voltage.
The beneficial effects of the utility model are: can reduce the supply voltage of LED giant-screen, save electric energy, reduce the dissipated power of chip for driving, reduce the working temperature of chip for driving, thereby reduce system temperature, improve system reliability.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Fig. 1 is the described LED screen of a utility model embodiment drive unit synoptic diagram;
Fig. 2 is the synoptic diagram of the described LED low-voltage driving of the utility model embodiment chip;
Fig. 3 is the described low pressure constant-current driving of a utility model embodiment conspectus;
Fig. 4 is metal-oxide-semiconductor operating voltage shown in Figure 3 and current relationship synoptic diagram.
Embodiment
As shown in Figure 1, the described LED screen of the utility model embodiment drive unit; Comprise: controller; Three driver modules that are connected with controller; One of them driver module connects red light emitting diodes, and the red light emitting diodes connection is preferably selected the 2.5V voltage source less than the power supply of 3V voltage; Two other driver module connects blue LED and green LED respectively, and blue LED is connected the power supply less than 4V voltage with green LED, preferably selects the 3.5V voltage source.
Described driver module comprises: the interface that is connected with controller/logical decode circuit; The constant-current source bias circuit; Described interface/logical decode circuit is connected a plurality of constant-current driving circuits respectively with the constant-current source bias circuit.
The utility model designs low-voltage constant current output driver circuit in the big screen LED chip for driving, adopts bluish-green and and red dual power supply form, cooperate the bluish-green lamp of low voltage drive chip can adopt the 3.8V power supply, red light adopts 2.5V to power.
As shown in Figure 2, LED low-voltage driving chip is made up of interface, logical decode, constant biasing, low pressure constant-current driving and part.
As shown in Figure 3, described constant-current driving circuit comprises: metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2 that source end, grid end link to each other respectively, and the drain terminal of metal-oxide-semiconductor Q2 is as the constant current output terminal; There are metal-oxide-semiconductor Q3 and operational amplifier to be connected between the drain terminal D and grid end G of metal-oxide-semiconductor Q2 as negative-feedback amplifier, the grid end of the drain terminal of metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2 is connected the constant-current source bias circuit respectively, the source end of metal-oxide-semiconductor Q3 connects the drain terminal of metal-oxide-semiconductor Q1, the in-phase input end of operational amplifier connects the drain terminal of metal-oxide-semiconductor Q2, the inverting input of operational amplifier connects the drain terminal of metal-oxide-semiconductor Q1, and the output terminal of operational amplifier connects the grid end of metal-oxide-semiconductor Q3; Above-mentioned metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3 are N type metal-oxide-semiconductor.
Operational amplifier OPAMP and Q3 constitute backfeed loop, keep the drain terminal voltage of Q1 to equate with the drain terminal voltage of Q2, and G, the D of Q1, Q2 two pipes, S three terminal voltages are equal fully so, and Q1, that Q2 two manages conducting states is identical.So because the electric current of Q1, Q2 is than the inverse ratio that is the breadth length ratio of Q1, Q2.So Iout=I1 * M2/M1 is arranged.Q1, the output of Q2 current ratio are because the electric current of the Q1 that flows through is built-in fixed bias constant current source, so the Q2 output current is a steady current.
Metal-oxide-semiconductor is operated in saturation region (constant current district) VGS is constant can to realize that ID is constant as long as keep when VDS is big as shown in Figure 4, will reduce in case enter variable resistor district ID.
Among Fig. 3 for Q2 Q3 be equivalent to one and be connected on the D drain terminal of Q2 and a negative-feedback amplifier of G grid end, improve the G terminal voltage of Q2 when the D terminal voltage of Q2 reduces by Q3, guarantee that Q2 keeps ID constant (seeing I1) when being operated in the variable resistor district because thereby the state consistency of operational amplifier OPAMP and Q3 formation double-feedback-loop assurance Q2Q1 is realized the constant current output of Q1 when low-voltage.
The utility model is not limited to embodiment discussed above.More than the description of embodiment is intended in order to describe and illustrate the technical scheme that the utility model relates to.Based on the conspicuous conversion of the utility model enlightenment or substitute and also should be considered to fall into protection domain of the present utility model.Above embodiment is used for disclosing best implementation method of the present utility model, so that those of ordinary skill in the art can use numerous embodiments of the present utility model and multiple alternative reaches the purpose of this utility model.
Claims (6)
1. LED screen drive unit; It is characterized in that, comprising:
Controller;
The a plurality of driver modules that are connected with controller;
Wherein each driver module connects a light emitting diode, and described light emitting diode connects the power supply less than 4V voltage.
2. LED screen drive unit as claimed in claim 1 is characterized in that, one of them driver module connects red light emitting diodes, and red light emitting diodes connects the power supply less than 3V voltage;
Two other driver module connects blue LED and green LED respectively, and blue LED is connected the power supply less than 4V voltage with green LED.
3. LED screen drive unit as claimed in claim 2 is characterized in that described driver module comprises: the interface that is connected with controller/logical decode circuit;
The constant-current source bias circuit;
Described interface/logical decode circuit is connected a plurality of constant-current driving circuits respectively with the constant-current source bias circuit.
4. LED screen drive unit as claimed in claim 3 is characterized in that, described constant-current driving circuit comprises:
Metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2 that source end, grid end link to each other respectively, the drain terminal of metal-oxide-semiconductor Q2 is as the constant current output terminal; There are metal-oxide-semiconductor Q3 and operational amplifier to be connected between the drain terminal D and grid end G of metal-oxide-semiconductor Q2 as negative-feedback amplifier, the grid end of the drain terminal of metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2 is connected the constant-current source bias circuit respectively, the source end of metal-oxide-semiconductor Q3 connects the drain terminal of metal-oxide-semiconductor Q1, the in-phase input end of operational amplifier connects the drain terminal of metal-oxide-semiconductor Q2, the inverting input of operational amplifier connects the drain terminal of metal-oxide-semiconductor Q1, and the output terminal of operational amplifier connects the grid end of metal-oxide-semiconductor Q3; Above-mentioned metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3 are N type metal-oxide-semiconductor.
5. LED screen drive unit as claimed in claim 2 is characterized in that, described red light emitting diodes connects the power supply of 2.5V voltage.
6. LED screen drive unit as claimed in claim 2 is characterized in that described blue LED is connected the power supply of 3.5V voltage with green LED.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206245480U CN201965888U (en) | 2010-11-25 | 2010-11-25 | LED (Light Emitting Diode) screen driving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206245480U CN201965888U (en) | 2010-11-25 | 2010-11-25 | LED (Light Emitting Diode) screen driving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201965888U true CN201965888U (en) | 2011-09-07 |
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ID=44528440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206245480U Expired - Lifetime CN201965888U (en) | 2010-11-25 | 2010-11-25 | LED (Light Emitting Diode) screen driving device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201965888U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104252839A (en) * | 2013-10-18 | 2014-12-31 | 广州硅芯电子科技有限公司 | LED display screen driving device, power supply method and LED display system |
| CN109377939A (en) * | 2018-11-16 | 2019-02-22 | 上海得倍电子技术有限公司 | A kind of high efficiency LED drive device |
-
2010
- 2010-11-25 CN CN2010206245480U patent/CN201965888U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104252839A (en) * | 2013-10-18 | 2014-12-31 | 广州硅芯电子科技有限公司 | LED display screen driving device, power supply method and LED display system |
| CN109377939A (en) * | 2018-11-16 | 2019-02-22 | 上海得倍电子技术有限公司 | A kind of high efficiency LED drive device |
| CN109377939B (en) * | 2018-11-16 | 2023-10-13 | 上海得倍电子技术有限公司 | High-efficiency LED driving device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110907 |