CN201450639U - High reliability LED constant current drive circuit capable of saving resources of circuits - Google Patents
High reliability LED constant current drive circuit capable of saving resources of circuits Download PDFInfo
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- CN201450639U CN201450639U CN2009200600185U CN200920060018U CN201450639U CN 201450639 U CN201450639 U CN 201450639U CN 2009200600185 U CN2009200600185 U CN 2009200600185U CN 200920060018 U CN200920060018 U CN 200920060018U CN 201450639 U CN201450639 U CN 201450639U
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Abstract
The utility model provides a high reliability LED constant current drive circuit capable of saving resources of circuits, which at least comprises a main circuit board, an integrated chip arranged on the main circuit board and consisting of a plurality of same switch constant current circuits, a current sampling circuit arranged on the main circuit board and connected with the integrated chip, and a plate level power supplying circuit which is arranged on the main circuit board, is connected with the integrated chip and the current sampling circuit, and is used for supplying power to the integrated chip and the current sampling circuit, thereby the circuit can solve the problems that the number of devices is big, the connection of circuits is complex, the reliability of circuits is poor, and the yield of products is low.
Description
Technical field
The utility model relates to a kind of LED constant-current drive circuit, relates in particular to a kind of highly reliable LED constant-current drive circuit that can save circuit resource.
Background technology
Still be the display panel field at illumination, backlight no matter, drive circuit all is the important component part of LED product, the just progressively enhancing along with the expansion in LED market of its technology maturity.Drive circuit mainly is for LED provides constant electric current, to guarantee the stable and even of its luminous intensity.Technology at comparative maturity aspect the constant-current driving of LED generally has linear constant-current driving control technology and Switching Power Supply constant-current drive technology two big classes at present, and the both is that step-down drives.Wherein, linear constant-current driving control technology implementation structure is simple, with low cost, but because constant-current driving is connected between input and the output, causes power supply conversion efficiency low, and caloric value is big; And the Switching Power Supply constant-current drive technology, compare linear constant current control technology, it adopts switching power source chip to carry out constant current control, have the power supply conversion efficiency more much higher than linear power supply, therefore reduced the temperature rise of constant-current drive circuit, widened input voltage range, so obtain application more and more widely.
LED belongs to the current drive-type device, must use constant-current drive circuit.LED constant-current driving method has linear constant-current driving and Switching Power Supply constant-current driving at present.With respect to linear constant current circuit, the switch constant-current circuit has power supply conversion efficiency height, wide input voltage range, advantages such as the circuit caloric value is little, and LED occurs and damage after the short circuit because power supply conversion efficiency is constant, therefore can not cause circuit to cross the cause thermal damage element, still can operate as normal.Therefore, the switch constant-current driving is widely used.
But the switch constant-current circuit is compared with linear constant current circuit, and required components and parts kind is many, quantity is many, causes switch constant-current drive circuit line complexity, and exploitation debugging cycle length, fault rate height, product reliability are poor.For example, the LED light fixture of a pixel must comprise red (R), green (G), blue (B) three road constant-current driven modules.As shown in Figure 1, at load LED1, load LED2 ..., each the load LED among the load LEDN driven by one road UC3843 circuit, each road all is provided with current feedback circuit simultaneously, be used for the current feedback of the load LED on this road is returned the UC3843 circuit, so that the break-make of UC3843 circuit adjustment switching tube.Because the UC3843 circuit uses the UC3843 chip, therefore, the components and parts number that each UC3843 circuit is comprised is approximately 30～40, so the components and parts number that 3 road UC3843 circuit are comprised is approximately 90～120, that is to say for a pixel (having 3 LED loads of RGB), then the required components and parts number of drive circuit is approximately 90～120, and if pixel number is N, then the number of components and parts sharply is increased to 90*N～120*N.Obviously, this circuit element is too much, and the line complexity in case break down, is overhauled very difficult.
From the above mentioned, it is various how to solve components and parts number required in the existing switch constant-current drive technology, and circuit connects complicated, and the problem that circuit reliability is poor, the finished product rate is low has become the technical task that those skilled in the art need to be resolved hurrily in fact.
The utility model content
The purpose of this utility model is to provide a kind of highly reliable LED constant-current drive circuit of saving circuit resource, effectively reduces the complexity of circuit.
Reach other purposes in order to achieve the above object, the highly reliable LED constant-current drive circuit of the saving circuit resource that the utility model provides comprises: main circuit board; Be arranged on the described main circuit board, comprise a plurality of same switch constant-current circuits and be used to form the integrated chip of pulse-width signal; Be arranged on the described main circuit board, comprise power tube that is connected with load LED and the current sampling circuit that is connected with described integrated chip; And, be arranged on the described main circuit board, be connected, be used for plate level power supply circuits with described integrated chip and current sampling circuit to the power supply of described integrated chip and current sampling circuit, wherein, described power tube is driven by described pulse-width signal, described current sampling circuit is used to detect the current current value of described load LED and detected present load current value is fed back to described integrated chip, so that described integrated chip is adjusted the duty ratio of formed pulse-width signal, and then to adjust the electric current of described load LED.
Preferable, described integrated chip can be the complex programmable device.
Further, described complex programmable device can have 16 tunnel same switch constant-current circuits.
Preferable, the number of identical a plurality of switch constant-current circuits that described constant-current driven module comprises is by the capacity decision of programming device.
In sum, the highly reliable LED constant-current drive circuit of saving circuit resource of the present utility model, employing has the integrated chip of multiple constant current circuit, can effectively save circuit resource, reach that effective solution components and parts number is various, circuit connect complicated, the problem that circuit reliability is poor, the finished product rate is low.
Description of drawings
Fig. 1 is the existing circuit theory schematic diagram that adopts UC3843 drives LED.
Fig. 2 is the highly reliable LED constant-current drive circuit structural representation of saving circuit resource of the present utility model.
Fig. 3 is the CPLD and the power tube connection diagram of the highly reliable LED constant-current drive circuit of saving circuit resource of the present utility model.
Embodiment
Below will come the highly reliable LED constant-current drive circuit of saving circuit resource of the present utility model is elaborated by specific embodiment.
See also Fig. 2, the highly reliable LED constant-current drive circuit of saving circuit resource of the present utility model comprises at least: main circuit board, integrated chip, current sampling circuit and plate level power supply circuits.
Described main circuit board is used to carry described integrated chip, current sampling circuit and plate level power supply circuits etc., and it can comprise necessary connection line, and this technology is known to those skilled in the art to be known, so be not described in detail in this.
Described integrated chip is arranged on the described main circuit board, himself comprise a plurality of same switch constant-current circuits, be used to form pulse-width signal, in the present embodiment, adopt the complex programmable device, promptly adopt CPLD, as shown in Figure 3 with 16 way switch constant-current circuits, output out_1, the out_2 of its 16 way switch constant-current circuit ..., out_16 is connected with a power tube respectively, promptly can drive 16 power tubes altogether.
Described current sampling circuit is arranged on the described main circuit board, and it comprises the power tube that is connected with load LED, and as power tube 7 and 8 etc., each power tube all is connected with the output pin of described CPLD, as shown in Figure 3.Described current sampling circuit is used to detect the current current value of described load LED and detected present load current value is fed back to described CPLD, so that described CPLD adjusts the duty ratio of formed pulse-width signal, and then to adjust the electric current of described load LED.Usually can come the LED load current is sampled by the resistance that is provided with and each LED load is connected respectively.
Described plate level power supply circuits are arranged on the described main circuit board, be connected with described integrated chip and current sampling circuit, being used for to described integrated chip and current sampling circuit power supply. the actual needs according to described CPLD and current sampling circuit provides corresponding power supply usually. and this known to those skilled in the art knowing is not described in detail in this.
Must attentively be that the number of loads that the user can drive is according to actual needs selected the CPLD of different model for use.
In sum, the highly reliable LED constant-current drive circuit of saving circuit resource of the present utility model adopts CPLD to replace the UC3843 circuit, can simplify circuit, particularly pixel thus many time, and this circuit reliability can improve the finished product rate greatly.
The foregoing description just lists expressivity principle of the present utility model and effect is described, but not is used to limit the utility model.Any personnel that are familiar with this technology all can make amendment to the foregoing description under spirit of the present utility model and scope.Therefore, rights protection scope of the present utility model should be listed as claims.
Claims (3)
1. highly reliable LED constant-current drive circuit of saving circuit resource is characterized in that comprising:
Main circuit board;
Be arranged on the integrated chip that comprises a plurality of same switch constant-current circuits on the described main circuit board, be used to form pulse-width signal;
Be arranged on the described main circuit board and the current sampling circuit that is connected with described integrated chip, it comprises the power tube and the described power tube that are connected with load LED and is driven by described pulse-width signal, described current sampling circuit is used to detect the current current value of described load LED and detected present load current value is fed back to described integrated chip, so that described integrated chip is adjusted the duty ratio of formed pulse-width signal, and then to adjust the electric current of described load LED;
Be arranged on the plate level power supply circuits on the described main circuit board, be connected, be used for to described integrated chip and current sampling circuit power supply with described integrated chip and current sampling circuit.
2. the highly reliable LED constant-current drive circuit of saving circuit resource as claimed in claim 1 is characterized in that: described integrated chip is the complex programmable device.
3. the highly reliable LED constant-current drive circuit of saving circuit resource as claimed in claim 2 is characterized in that: described complex programmable device has 16 tunnel same switch constant-current circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200600185U CN201450639U (en) | 2009-07-08 | 2009-07-08 | High reliability LED constant current drive circuit capable of saving resources of circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200600185U CN201450639U (en) | 2009-07-08 | 2009-07-08 | High reliability LED constant current drive circuit capable of saving resources of circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201450639U true CN201450639U (en) | 2010-05-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200600185U Expired - Fee Related CN201450639U (en) | 2009-07-08 | 2009-07-08 | High reliability LED constant current drive circuit capable of saving resources of circuits |
Country Status (1)
| Country | Link |
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| CN (1) | CN201450639U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012037803A1 (en) * | 2010-09-21 | 2012-03-29 | Wang Hanzhong | Constant current driving circuit for led |
| CN103327669A (en) * | 2013-06-08 | 2013-09-25 | 成都成电硅海科技股份有限公司 | LED driving circuit |
| CN104219839A (en) * | 2014-08-27 | 2014-12-17 | 电子科技大学 | Laser diode drive circuit |
-
2009
- 2009-07-08 CN CN2009200600185U patent/CN201450639U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012037803A1 (en) * | 2010-09-21 | 2012-03-29 | Wang Hanzhong | Constant current driving circuit for led |
| CN103327669A (en) * | 2013-06-08 | 2013-09-25 | 成都成电硅海科技股份有限公司 | LED driving circuit |
| CN104219839A (en) * | 2014-08-27 | 2014-12-17 | 电子科技大学 | Laser diode drive circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100505 Termination date: 20130708 |