CN101267696B - LED driving circuit module - Google Patents
LED driving circuit module Download PDFInfo
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- CN101267696B CN101267696B CN2007100875037A CN200710087503A CN101267696B CN 101267696 B CN101267696 B CN 101267696B CN 2007100875037 A CN2007100875037 A CN 2007100875037A CN 200710087503 A CN200710087503 A CN 200710087503A CN 101267696 B CN101267696 B CN 101267696B
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Abstract
The invention relates to a light emitting diode driving circuit module, a driving circuit comprises at least a constant current integrate circuit provided with a plurality of pins; light emitting diode tube strings, each of which is provided with a first end and a second end and is composed by series-connected light emitting diodes, wherein the first end is coupled with a pin of a power supply, the second end is coupled with a first pin of the constant current integrate circuit; and diodes with anodes respectively connected with connection points between the light emitting diodes and cathodes connected with each other and coupled with a second and a third pin of the constant current integrate circuit. The light emitting diode driving circuit module provides proper power supplying for the constant current integrate circuit by using a bleeder circuit. The invention is capable of being used for singly driving a plurality of light emitting diode tube strings, breaking the limit that a traditional driving circuit can not singly drive a plurality of light emitting diode tube strings, thereby improving the integrate circuit utilization rate, reducing cost and being very suitable for application.
Description
Technical field
The present invention relates to a kind of LED driving circuit module, particularly relate to a kind of LED driving circuit module that can drive a plurality of light emitting diode string individually.
Background technology
Along with electronic industry is day by day flourishing, light-emitting diode has become the luminous energy source of many electronic products.With on the circuit framework of deciding electric current integrated circuit (Current Regulator IC) driven for emitting lights diode, can only start each light emitting diode string simultaneously at present.Seeing also shown in Figure 1ly, is the existing circuit diagram that starts the drive circuit of a plurality of light emitting diode string traditional the time, and it has illustrated the drive circuit 100 that starts a plurality of light emitting diode string simultaneously.Wherein not necessarily have only three light emitting diode string 110, each light emitting diode string 110 not necessarily includes only three light-emitting diodes 112.Decide electric current integrated circuit 114 and comprise power supply input pin VDD and start pin Enable that some VDD and Enable that decides electric current integrated circuit 114 can be same pin.When the pin 1～3 of power connector 116 is logical when giving suitable positive voltage,, can't directly provide given electric current integrated circuit 114 so voltage is too high usually because this voltage needs greater than the forward bias after the light-emitting diode series connection.So need to utilize electricity group 118 and zener diode 120 to form bleeder circuits 122, provide given electric current integrated circuit 114 after producing suitable voltage.And, because the power end 124 of all light emitting diode string 110 is coupled to same node by bleeder circuit 122 mutually with power supply input pin VDD and startup pin Enable, so as long as arbitrary pin conducting voltage of power connector 116, then the power end 124 of all light emitting diode string 110 all bears identical voltage, and lights all light emitting diode string 110.
Therefore, the different light emitting diode string of indivedual if desired startups then needs to utilize a plurality of purposes that the electric current integrated circuit just can be reached indivedual startup light emitting diode string of deciding.A plurality ofly decide the electric current integrated circuit and then can raise the cost because use, and the service efficiency that the electric current integrated circuit is decided in waste, so need one can drive the LED driving circuit module of different light emitting diode string individually at present providing suitable power supply to decide under the electric current integrated circuit to one.
This shows that above-mentioned existing LED driving circuit obviously still has inconvenience and defective, and demands urgently further being improved in structure and use.In order to solve the problem of above-mentioned existence, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and common product does not have appropriate structure to address the above problem, this obviously is the problem that the anxious desire of relevant dealer solves.Therefore how to found a kind of LED driving circuit module of new structure, real one of the current important research and development problem that belongs to, also becoming the current industry utmost point needs improved target.
Because the defective that above-mentioned existing LED driving circuit exists, the inventor is based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge thereof, and the utilization of cooperation scientific principle, actively studied innovation, in the hope of founding a kind of LED driving circuit module of new structure, can improve general existing LED driving circuit, make it have more practicality.Through constantly research, design, and, create the present invention who has practical value finally through after studying sample and improvement repeatedly.
Summary of the invention
The objective of the invention is to, overcome the defective that existing LED driving circuit exists, and a kind of LED driving circuit module of new structure is provided, technical problem to be solved is to make it can drive a plurality of light emitting diode string individually, is very suitable for practicality.
The object of the invention to solve the technical problems is to adopt following technical scheme to realize.According to a kind of LED driving circuit module that the present invention proposes, it comprises: certain electric current integrated circuit has a plurality of pins; A plurality of light emitting diode string, each those light emitting diode string comprises first end and second end, and formed by a plurality of light-emitting diodes that are connected in series, wherein a pin of this first end and a power supply couples, and this second end then couples with first pin that this decides the electric current integrated circuit; And a plurality of diodes, the anode of those diodes is connected to the tie point between those light-emitting diodes, and the negative electrode of those diodes is connected to each other and couples with this second and the 3rd pin of deciding the electric current integrated circuit.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid LED driving circuit module, wherein said first pin are that a plurality of light-emitting diodes are decided the electric current pin.
Aforesaid LED driving circuit module, wherein said second pin is a power pin.
Aforesaid LED driving circuit module, wherein said the 3rd pin are startup pins.
Aforesaid LED driving circuit module, the tie point that anode connected of wherein said those diodes, because of the pressure drop that those light-emitting diode forward biases are produced, make the voltage drop of tie point be low to moderate an appropriate voltage and offer this and decide the electric current integrated circuit.
The object of the invention to solve the technical problems also realizes by the following technical solutions.According to a kind of LED driving circuit module that the present invention proposes, it comprises: certain electric current integrated circuit has a plurality of pins; A plurality of light emitting diode string, each those light emitting diode string comprises first end and second end, and formed by a plurality of light-emitting diodes that are connected in series, wherein a pin of this first end and a power supply couples, and this second end is then decided electric current integrated circuit first pin with this and is coupled; A plurality of diodes, the negative electrode of those diodes is connected to each other and couples with this second and the 3rd pin of deciding the electric current integrated circuit, and a plurality of bleeder circuits, in order to the suitable voltage of the second and the 3rd pin that provides this to decide the electric current integrated circuit, those bleeder circuits comprise at least: a plurality of zener diodes, and wherein the negative electrode of those zener diodes is electrically connected at the anode of corresponding those diodes; And a plurality of resistance, the two ends of those resistance are connected to the negative electrode of those zener diodes and this first end of those light emitting diode string.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid LED driving circuit module, wherein said first pin are that a light-emitting diode is decided the electric current pin.
Aforesaid LED driving circuit module, wherein said second pin is a power pin.
Aforesaid LED driving circuit module, wherein said the 3rd pin are startup pins.
Aforesaid LED driving circuit module, wherein said appropriate voltage are that this supply voltage specification of deciding the electric current integrated circuit is with interior voltage.
The present invention compared with prior art has tangible advantage and beneficial effect.As known from the above, for achieving the above object, major technique of the present invention thes contents are as follows:
The first embodiment of the present invention is diode to be arranged at each light emitting diode string couple mutually on the circuit paths before.By the characteristic of diode, make electric current only can flow into the light emitting diode string of desiring to light, and can not flow into remaining light emitting diode string, also can reach the purpose of the different light emitting diode string of indivedual drivings.
What the second embodiment of the present invention was same can drive different light emitting diode string individually, and the pressure drop that utilizes the forward bias (Forward Voltage) of light-emitting diode to be provided, and supplies the power supply of deciding the electric current integrated circuit.Therefore, the power supply of deciding the electric current integrated circuit then can be connected to a pressure drop node with appropriate voltage, also can not cause to destroy because of excessive voltage and decide the electric current integrated circuit.Diode is connected on the circuit paths before the node that each light emitting diode string couples mutually equally.
The third embodiment of the present invention is connected in the power supply of deciding the electric current integrated circuit with the node of voltage minimum in the light emitting diode string.This enforcement can be omitted the use of diode, can reach the purpose of the different light emitting diode string of indivedual drivings.Because the node of voltage minimum also is the node of light emitting diode string end in the light emitting diode string, so, also can not light remaining light-emitting diode even electric current is back to light emitting diode string through circuit paths.But, adopt this embodiment must determine that the node voltage of voltage minimum in the light emitting diode string is suitable voltage, can be supplied in and decide the electric current integrated circuit.
By technique scheme, LED driving circuit module of the present invention has following advantage and beneficial effect at least:
1, the present invention can provide a kind of LED driving circuit module, in order to a plurality of light emitting diode string of indivedual drivings, has broken through the restriction that existing traditional drive circuit can't drive a plurality of light emitting diode string individually.
2, the present invention can reach the purpose and the effect of the different light emitting diode string of indivedual drivings.This driving force can be utilized respectively and decide light-emitting diodes tube passages all in the electric current integrated circuit, also improved the service efficiency of integrated circuit, do not need to utilize and a plurality ofly decide the electric current integrated circuit and drive different light emitting diode string individually, can reduce cost, and have industrial utilization, be very suitable for practicality.
In sum, the invention relates to a kind of LED driving circuit module, drive circuit comprises certain electric current integrated circuit at least, has a plurality of pins; Light emitting diode string, each light emitting diode string comprise first end and second end, and are made up of the light-emitting diode that is connected in series, and wherein a pin of first end and a power supply couples, and second end then couples with first pin of deciding the electric current integrated circuit; And diode, the anode of diode is connected to the tie point between light-emitting diode, and the negative electrode of diode is connected to each other and couples with the second and the 3rd pin of deciding the electric current integrated circuit.The present invention can drive a plurality of light emitting diode string individually, is very suitable for practicality.The present invention more uses bleeder circuit to provide to decide the suitable power supply supply of electric current integrated circuit.The present invention has above-mentioned many advantages and practical value, no matter it all has bigger improvement on product structure or function, obvious improvement is arranged technically, and produced handy and practical effect, and more existing LED driving circuit has the outstanding effect of enhancement, thereby being suitable for practicality more, really is a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, and for above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 is the existing circuit diagram that starts the drive circuit of a plurality of light emitting diode string traditional the time.
Fig. 2 is the schematic circuit diagram according to the first embodiment of the invention LED driving circuit.
Fig. 3 is the schematic circuit diagram according to the second embodiment of the invention LED driving circuit.
Fig. 4 is the schematic circuit diagram according to the third embodiment of the invention LED driving circuit.
100: the drive circuit 110 of traditional light emitting diode string: light emitting diode string
112: light-emitting diode 114: decide the electric current integrated circuit
116: power connector 118: the electricity group
120: zener diode 122: bleeder circuit
124: power end 200: the LED driving circuit module
210a～c: light emitting diode string 214: decide the electric current integrated circuit
216: power connector 218: resistance
220: zener diode 222: bleeder circuit
224a～c: first end 226a～c: second end
228a～c: diode 232: bleeder circuit
310a～c: light emitting diode string 314: decide the electric current integrated circuit
328a～c: diode 332a～c: node
400: LED driving circuit module 416: power connector
230: bleeder circuit 300: the LED driving circuit module
316: power connector 330a～c: node
334a～c: node 410a～c: light emitting diode string
414: decide electric current integrated circuit 434a～c: node
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, to its embodiment of LED driving circuit module, structure, feature and the effect thereof that foundation the present invention proposes, describe in detail as after.
Seeing also shown in Figure 2ly, is the schematic circuit diagram according to the first embodiment of the invention LED driving circuit.According to present embodiment, this LED driving circuit 200 comprises a power connector 216, three light emitting diode string 210a, 210b and 210c, certain electric current integrated circuit 214, three bleeder circuits and three diode 228a, 228b and 228c.Wherein each light emitting diode string is to be formed by three light-emitting diode polyphones.Yet, it should be noted that in other embodiments the number of light-emitting diode does not exceed with three.
This power connector 216 couples with the first end 224a, 224b and the 224c of light emitting diode string 210a, 210b and 210c respectively, its tie point place then connects bleeder circuit 222,230 and 232 respectively, each bleeder circuit wherein, for example bleeder circuit 222, are made up of resistance 218 and a zener diode 220 polyphones.Bleeder circuit 222,230 then is connected with the anode of diode 228a, 228b and 228c respectively with 232 dividing potential drop node place, the negative electrode of diode 228a, 228b and 228c then is connected to each other, and is connected with the power pin of deciding electric current integrated circuit 214 (VDD) and startup pin (EN).In addition.The second end 226a, the 226b of light emitting diode string 210a, 210b and 210c and 226c then decide electric current pin (LED) and couple with three that decide electric current integrated circuit 214.
When the pin 1～3 of power connector 216 is logical when giving suitable positive voltage,, can't directly provide given electric current integrated circuit 214 so voltage is too high usually because this voltage needs greater than for example forward bias of light emitting diode string 210a.So provide given electric current integrated circuit 214 after need utilizing bleeder circuit 222 to produce suitable voltage.Above-mentioned circuit framework can drive different light emitting diode string individually.For example, as desire to light light emitting diode string 210a, positive source can be imported the pin 1 of power connector 216, this power supply provides through resistance 218 and diode 228a decides the required power supply of electric current integrated circuit 214, is in actuator state so that decide electric current integrated circuit 214.This power supply produces electric current through light emitting diode string 210a simultaneously, and light emitting diode string 210a is lighted.Power supply is through after resistance 218 and the diode 228a, because the characteristic of the diode 228b and the single sense of current of 228c, make electric current can't reversely pass through diode 228b and 228c, also can't flow through light emitting diode string 210b and 201c, and then light emitting diode string 210b and the required power supply of 210c can't be provided.So light emitting diode string 210b and 210c can not be driven and light.In like manner, if desire to light light emitting diode string 210b or 210c, the corresponding pin 2 or 3 that then positive source is imported power connector 216 gets final product.Circuit framework can drive different light emitting diode string individually thus, and can not lighted because of current reflux causes all light emitting diode string.
See also shown in Figure 3ly, be schematic circuit diagram according to the second embodiment of the invention LED driving circuit.According to present embodiment, this LED driving circuit 300 comprises a power connector 316, three light emitting diode string 310a, 310b and 310c, certain electric current integrated circuit 314 and three diode 328a, 328b and 328c.Wherein each light emitting diode string is to be formed by three light-emitting diode polyphones.Yet, it should be noted that in other embodiments the number of light-emitting diode does not exceed with three.The power connector 316 of second embodiment of the invention, light emitting diode string 310a～c and to decide the connection framework of electric current integrated circuit 314 identical with above-mentioned first embodiment of the present invention be not so just given unnecessary details at this.Its different place is, diode 328a, the 328b of second embodiment of the invention and the anode of 328c respectively with corresponding node 330a, 330b and 330c, node 332a, 332b are connected with 334c with 332c or node 334a, 334b.The pressure drop that the forward bias of utilizing light emitting diode string 310a, 310b and 310c to be had is brought can reduce power source voltage, can provide given electric current integrated circuit 314, the use that can omit bleeder circuit 222 to obtain lower voltage.The node that anode was connected of diode 328a, 328b and 328c depends on whether the voltage of this node can provide decides the suitable input voltage of electric current integrated circuit 314.So, what second embodiment of the invention was same can decide under the suitable input voltage of electric current integrated circuit 314 providing, and indivedual the driving lighted different light emitting diode string.
Seeing also shown in Figure 4ly, is to be the schematic circuit diagram according to the third embodiment of the invention LED driving circuit.According to present embodiment, this LED driving circuit 400, it comprises a power connector 416, three light emitting diode string 410a, 410b and 410c and certain electric current integrated circuit 414.Wherein each light emitting diode string is to be formed by three light-emitting diode polyphones.Yet, it should be noted that in other embodiments the number of light-emitting diode does not exceed with three.The power connector 416 of third embodiment of the invention and light emitting diode string 410a, 410b and 410c to be connected framework identical with second embodiment of the invention, so just do not given unnecessary details at this.Its different places are, third embodiment of the invention is that power pin (VDD) and the startup pin (Enable) that will decide electric current integrated circuit 414 are connected directly to corresponding node 434a, 434b and 434c, and the use of having omitted diode 328a, 328b and 328c.For example, when importing cathode voltage to power connector 416, electric current will be lighted light emitting diode string 410a, and produce voltage at node 434a.Because node 434a, 434b and 434c are same node, so this node 434a, 434b and 434c conducting voltage all.But, because light-emitting diode 410b and 401c can't reverse drive, so light emitting diode string 410b and 410c will can not lighted.The minimum voltage node of light emitting diode string 410a, 410b and 410c (for example node 434a, 434b and 434c) also is that light emitting diode string 410a, 410b decide the node that electric current pin (LED) is connected with 410c with three light-emitting diodes deciding electric current integrated circuit 414.If the voltage of this node can provide is decided the suitable voltage of electric current integrated circuit 414, then can not need to drive different light emitting diode string individually under the framework of diode 328a, 328b and 328c as shown in Figure 3.
Above embodiment all can reach the purpose and the effect of the different light emitting diode string of indivedual drivings.This driving force can be utilized respectively and decide light-emitting diodes tube passages all in the electric current integrated circuit, also improved the service efficiency of integrated circuit, do not need to utilize and a plurality ofly decide the electric current integrated circuit and drive different light emitting diode string individually, can reduce cost, have industrial utilization, be very suitable for practicality.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (3)
1. LED driving circuit module is characterized in that it comprises:
Certain electric current integrated circuit has a plurality of pins;
A plurality of light emitting diode string, each those light emitting diode string includes first end and second end, and formed by a plurality of light-emitting diodes that are connected in series, wherein a pin of this first end and a power supply couples, this second end then couples with first pin that this decides the electric current integrated circuit, and wherein should decide the electric current integrated circuit is in order to each those light emitting diode string of indivedual startups; And
A plurality of diodes, the anode of those diodes is connected to the tie point between those light-emitting diodes, the negative electrode of those diodes is connected to each other and couples with this second and the 3rd pin of deciding the electric current integrated circuit, wherein said first pin is that a plurality of light-emitting diodes are decided the electric current pin, described second pin is a power pin, described the 3rd pin is a startup pin, the tie point that anode connected of wherein said those diodes, because of the pressure drop that those light-emitting diode forward biases are produced, make the voltage drop of tie point be low to moderate an appropriate voltage and offer this and decide the electric current integrated circuit.
2. LED driving circuit module is characterized in that it comprises:
Certain electric current integrated circuit has a plurality of pins;
A plurality of light emitting diode string, each those light emitting diode string comprises first end and second end, and formed by a plurality of light-emitting diodes that are connected in series, wherein a pin of this first end and a power supply couples, this second end then couples with first pin that this decides the electric current integrated circuit, and wherein should decide the electric current integrated circuit is in order to each those light emitting diode string of indivedual startups;
A plurality of diodes, the negative electrode of those diodes are connected to each other and couple with this second and the 3rd pin of deciding the electric current integrated circuit; And
A plurality of bleeder circuits, in order to this suitable voltage of the second and the 3rd pin of deciding the electric current integrated circuit to be provided, those bleeder circuits comprise at least:
A plurality of zener diodes, wherein the negative electrode of those zener diodes is electrically connected at the anode of corresponding those diodes; And
A plurality of resistance, the two ends of those resistance are connected to the negative electrode of those zener diodes and this first end of those light emitting diode string, wherein said first pin is that a light-emitting diode is decided the electric current pin, described second pin is a power pin, and described the 3rd pin is a startup pin.
3. LED driving circuit module according to claim 2 is characterized in that wherein said appropriate voltage is that this supply voltage specification of deciding the electric current integrated circuit is with interior voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100875037A CN101267696B (en) | 2007-03-16 | 2007-03-16 | LED driving circuit module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100875037A CN101267696B (en) | 2007-03-16 | 2007-03-16 | LED driving circuit module |
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| Publication Number | Publication Date |
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| CN101267696A CN101267696A (en) | 2008-09-17 |
| CN101267696B true CN101267696B (en) | 2011-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2007100875037A Expired - Fee Related CN101267696B (en) | 2007-03-16 | 2007-03-16 | LED driving circuit module |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1790127A (en) * | 2004-12-13 | 2006-06-21 | 广达电脑股份有限公司 | LED drive device |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1790127A (en) * | 2004-12-13 | 2006-06-21 | 广达电脑股份有限公司 | LED drive device |
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| CN101267696A (en) | 2008-09-17 |
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Granted publication date: 20111228 Termination date: 20170316 |