CN102340910A - Light emitting diode control circuit - Google Patents
Light emitting diode control circuit Download PDFInfo
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- CN102340910A CN102340910A CN2010102430788A CN201010243078A CN102340910A CN 102340910 A CN102340910 A CN 102340910A CN 2010102430788 A CN2010102430788 A CN 2010102430788A CN 201010243078 A CN201010243078 A CN 201010243078A CN 102340910 A CN102340910 A CN 102340910A
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Abstract
The invention relates to a light emitting diode control circuit, which mainly comprises a light emitting module, a logic gate circuit and a protection switch, wherein the light emitting module comprises a plurality of light strings; each light string is provided with more than one light emitting diode; the input end of each light string is connected with an input power supply, and the output end of each light string is connected to the logic gate circuit; the protection switch is arranged on a power supply loop of the light emitting module and controlled by an output signal of the logic gate circuit; when all light emitting diodes normally work, the input ends of the logic gate circuit are in a high level and the output end of the logic gate circuit is also in the high level, so the protection switch is switched on, and all the light emitting diodes give out light; and when at least one of the light emitting diodes fails, at least one input end of the logic gate circuit is in the low level and the output end of the logic gate circuit is in the low level, so the protection switch is turned off, and all the light emitting diodes of the light emitting module go out.
Description
Technical field
The present invention relates to a kind of LED control circuit, refer to a kind of control circuit that when more than one light-emitting diode fault, can close all light-emitting diodes at once especially.
Background technology
Light-emitting diode is a kind of semiconductor element; Because of its luminous efficiency height and long service life; So light-emitting diode often is used in illumination and the information indication in the modern society; Like flashlight, automobile rain lamp, directing light of automobile and traffic lights etc., and different application has difference mutually for the characteristic requirements of led lamp, and for example directing light of automobile is provided in a side of the tail end left and right sides of automobile; When turning left or turn right, need open the indicator of corresponding direction; Make the driver who is positioned at other vehicles of automobile rear can know the direct of travel of front vehicles, in order to let the vehicle at rear can know the variation of seeing cresset under the different visibilitys under varying environment, so directing light of automobile needs higher illumination intensity; And, on using, often a plurality of light emitting diode combined are formed a whole light fixture together in order to increase the illumination intensity of the directing light of automobile that light-emitting diode forms.Existing directing light of automobile is as shown in Figure 2; Mainly be made up of 70 of light emitting modules, this light emitting module 70 has an input and a plurality of output, and its input is connected with the input power supply; Its output is connected with earth terminal through current-limiting resistance 80; Because light emitting module 70 is made up of the parallel connection mutually of a plurality of light-emitting diodes, when one of them light-emitting diode damage did not work, other light-emitting diodes still can continue shinny.
But; Though after the light-emitting diode in the existing directing light of automobile had damaged one or two, overall illumination intensity can not reduce too much, human naked eyes are not easy to find out that difference still can continue to use; But as the light-emitting diode that damages continues to increase; May cause general lighting intensity to be lower than the minimum standard of particular locality (like European Union) relevant regulations, can't not bring into play its due function, the danger in the time of may causing steering vehicle just the user does not examine when continuing to use for the moment.The above person is all existing directing light of automobile and does not attain desirable part, remains in fact further to be examined, and seeks feasible solution.
Summary of the invention
Because aforementioned led lamp is applied in the shortcoming on the directing light of automobile; Main purpose of the present invention is to provide a kind of LED control circuit; It can be when more than one light-emitting diode fault; Cut off the loop of all light-emitting diodes immediately, whole light-emitting diodes are extinguished.
For reaching the major technique means that aforementioned purpose takes is to make aforementioned LED control circuit include:
One light emitting module has an above input and many outputs at least, and its input is connected with a power input, and this light emitting module mainly is made up of a plurality of lamp strings, and this lamp string includes the light-emitting diode of connecting each other more than;
One protection switch is located on the electric power loop of aforementioned light emitting module, and this protection switch has a control end;
One logic gates mainly is to be made up of more than one gate, has many inputs and an output at least, and each input is connected with each lamp string output of light emitting module respectively, and the output of this gate then is connected to the control end of this protection switch; Wherein:
This logic gates is in order to the light-emitting diode of each lamp string on detecting light emitting module fault whether; If whole light-emitting diodes all can normally move; All inputs of logic gates are all high potential; Its output is a high potential also, connects the electric power loop of light emitting module so make the protection switch conducting, and all light-emitting diodes of light emitting module are all lighted; When if at least one light-emitting diode fault is arranged; With being electronegative potential at least one input that makes logic gates, and the output of logic gates is promptly transmitted electronegative potential, makes protection switch transmit open circuit; So far electric power loop promptly is cut off, and whole light-emitting diodes is extinguished; Design can guarantee that led lamp has only complete bright and complete dark two kinds of situations in this way; When more than one light-emitting diode fault; Whole light emitting module just can extinguish, and lets the user can know the unusual of led lamp at once, and then changes or the maintenance led lamp; When aforementioned led lamp uses as directing light of automobile; In the time of can guaranteeing the light-emitting diode fault is arranged in the directing light of automobile, can in time be discovered, and then meet relevant laws and regulations and guarantee safe in utilization by the user.
Description of drawings
Fig. 1 is a circuit diagram of the present invention
Fig. 2 is the circuit diagram of existing automotive light-emitting diode indicator
The main element symbol description
20 light emitting modules
30 protection switches
40 logic gates
50 revers voltage protective circuits
60 surging resistant high voltage circuit
70 light emitting modules
80 current-limiting resistances
Embodiment
The detailed circuit diagram of relevant one embodiment of the present invention; See also shown in Figure 1ly, it includes a light emitting module 20, a protection switch 30 and a logic gates 40, and this light emitting module 20 has an input and many outputs; Its input is connected with the input power supply; To obtain driving the required electric energy of this light emitting module 20, these light emitting module 20 outputs are connected with logic gates 40 each input, and this logic gates 40 mainly is to be made up of more than one gate; And this logic gates 40 has many inputs and an output at least; Its output is in order to the keying of control protection switch 30, and protection switch 30 is located on the electric power loop of light emitting module 20 and connect with these light emitting module 20 outputs again, thereby controls this light emitting module 20 and import the electric power loop between the power supply.Below further specify the detailed circuit structure of aforementioned each element:
This light emitting module 20 mainly is made up of a plurality of lamp strings, and each lamp string includes the light-emitting diode of connecting each other more than, and the tail end of each lamp string is formed with an output respectively.In present embodiment, a light emitting module 20 has seven electroluminescent lamp strings, and a lamp string includes three light-emitting diodes of series connection each other.
This logic gates 40 mainly makes its many inputs be connected and receive the current potential of each lamp string output respectively with light emitting module 20 each lamp string output, is just decided the conducting opportunity of protection switch 30 again by the current potential of these logic gates 40 outputs.See also shown in Figure 1; In present embodiment, this logic gates 40 is divided into three grades of institutes by a plurality of gate U2A～U2C, U3A～U3C and forms, and each lamp string output connects the input of gate respectively; This logic gates 40 has six gates; And six gates are all the AND gate, and each AND gate all has two inputs and an output, and the third level has a gate U3B; The output of second level gate U3A, U3C is connected with the input of gate U3B, and the output of this gate U3B is connected with the control end of protection switch 30.
In present embodiment, this protection switch 30 is field-effect transistor Q4, and aforementioned control end is meant the grid of field-effect transistor Q4, and drain, source electrode connects light emitting module 20 and earth terminal respectively, and connects the input power supplys to constitute the loop through light emitting module 20.
In order to protect LED control circuit, present embodiment is provided with a revers voltage protective circuit 50 and surging resistant high voltage circuit 60 between light emitting module 20 and input power supply; This revers voltage protective circuit 50 has an input and an output, and its input is connected with the input power supply, and this revers voltage protective circuit 50 mainly is to be made up of a diode D2 in present embodiment; When direct-flow positive voltage flows into revers voltage protective circuit 50; Diode D2 conducting, LED control circuit have the power supply supply just can move, otherwise; When negative dc voltage flows into; Not conducting of diode D2, LED control circuit can not receive the negative dc voltage influence, to reach the function of protection LED control circuit; Surging resistant high voltage circuit 60 has an input and an output; Its input is connected with the output of revers voltage protective circuit 50; Its output is connected with light emitting module 20, and the base stage that this surging resistant high voltage circuit 60 mainly makes a transistor Q3 is connected with the input power supply through receiving diode at least simultaneously, is determined the conducting opportunity of transistor Q3 by the breakdown voltage of Zener diode; In present embodiment; The transistor Q3 collection utmost point is connected to the input of light emitting module 20, and is provided with three Zener diode DZ6, DZ7, DZ9 and two resistance R 25, R26, Zener diode DZ6 and DZ7 series connection between the base stage of transistor Q3 and the input; And Zener diode DZ6 and DZ7 are parallelly connected with Zener diode DZ9; The additive value of this Zener diode DZ6 and the specified breakdown voltage of DZ7 and Zener diode DZ9 are approximate, and its function is to share the electric current of the Zener diode DZ9 that flows through, is provided with another Zener diode DZ8 again between its base stage and the earth terminal; Under this situation, the conducting of transistor Q3 is at input terminal voltage during greater than the combination sum total value of Zener diode DZ6, DZ7, DZ8 and the specified breakdown voltage of DZ9 opportunity; And have more than one resistance R 27, R28, R29, R30, R31 to be connected across between input power supply and the earth terminal, its function is for reducing the electric current that flows into LED control circuit.It is understandable that to those skilled in the art: the visual actual demand of the quantity of this Zener diode or resistance and specification and increase and decrease adjustment.
Can understand the concrete technology contents of one embodiment of the present invention by above-mentioned explanation, detailed in the following stated as for its operation principle:
When all the LED 32～LED53 of lamp string all can normally move on the light emitting module 20; The input of gate U2A～U2C, U3A is all high potential; Thereby to make the output of gate U3B be high potential, and make this transistor Q4 conducting, so whole light-emitting diode is all shinny; When supposing among the LED 32～LED53 of light emitting module 20 arbitrary lamp strings at least one fault; The output of lamp string promptly presents electronegative potential under this fault light-emitting diode, so logic gates 40 to have the input of a gate at least be electronegative potential because the compound mode of gates in this logic gates 40; In the time of can making this logic gates 40 have at least an input to be electronegative potential; These logic gates 40 outputs are electronegative potential, so the output of logic gates 40 is an electronegative potential, the field-effect transistor Q4 of protection switch 30 are ended; So light emitting module 20 whole light-emitting diodes extinguish, reach control purpose bright entirely or that go out entirely thus.
The breakdown voltage combination sum total value of supposing four Zener diode DZ6, DZ7, DZ8 and DZ9 in the surging resistant high voltage circuit 60 is 59.1V; Then when the input power source voltage is not higher than 59.1V; Four Zener diode DZ6, DZ7, DZ8 and DZ9 are not conducting; Also not conducting of transistor Q3, this moment, LED control circuit can be supplied power and operate as normal by power-supply device; If the input power supply surging occurs and its magnitude of voltage surpasses 59.1V; Then four Zener diode DZ6, DZ7, DZ8 and DZ9 collapse conductings; Also make transistor Q3 conducting; Its collection utmost point will transfer electronegative potential to by high potential this moment, interrupt the electric power loop of LED control circuit thus, guarantee that LED control circuit is not damaged by the surging high pressure.
Aforesaid Circuit Design can guarantee only to have when led lamp is used in directing light of automobile complete bright and complete dark two kinds of situations; When more than one light-emitting diode fault; Whole directing light of automobile just can extinguish; Let the user can know the unusual of this directing light of automobile at once; And then change or the indicator that services a car, can normally bring into play due function when guaranteeing that the user uses directing light of automobile, also make the illumination intensity of this automotive light-emitting diode indicator can meet the relevant regulations of particular locality (like European Union).
The above is merely the preferred embodiments of the present invention; Not being that the present invention is done any pro forma restriction, though the present invention with the preferred embodiment exposure as above, yet is not in order to limit the present invention; Any those skilled in the art; In the scope that does not break away from technical scheme of the present invention, make a little change or be modified to the equivalent embodiment of equivalent variations when the technology contents of above-mentioned announcement capable of using, be the content that does not break away from technical scheme of the present invention in every case;, all still belong in the scope of technical scheme of the present invention any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present invention.
Claims (6)
1. a LED control circuit is located on the electric power loop between power input and the earth terminal, and it includes:
One light emitting module has an above input and many outputs at least, and its input is connected with a power input, and this light emitting module mainly is made up of a plurality of lamp strings, and this lamp string includes the light-emitting diode of connecting each other more than;
One protection switch is located on the electric power loop of aforementioned light emitting module, and this protection switch has a control end;
One logic gates mainly is to be made up of more than one gate, has many inputs and an output at least, and each input is connected with each lamp string output of light emitting module respectively, and the output of this gate then is connected to the control end of this protection switch;
Thus, one of them output valve of this logic gates detecting light emitting module is an electronegative potential, and the loop of cutting off the electricity supply is extinguished whole light-emitting diodes even protection switch is open circuit.
2. LED control circuit according to claim 1, the gate on this logic gates is all the AND gate, and each AND gate has two inputs and an output.
3. LED control circuit according to claim 2; This logic gates is made up of three grades of gates; Each lamp string output connects the input of gate respectively; The third level has a gate, and the output of second level gate is connected with the input of gate, and the output of this third level gate can be sent to the output potential of logic gates the control end of protection switch.
4. according to arbitrary described LED control circuit in the claim 1 to 3, this protection switch is a field-effect transistor, and its grid constitutes the control end of electric power loop, and drain, source electrode connects light emitting module and earth terminal respectively.
5. LED control circuit according to claim 4 is provided with a surging resistant high voltage circuit between input power supply and the light emitting module.
6. LED control circuit according to claim 5 is provided with a revers voltage protective circuit between input power supply and the surging resistant high voltage circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102430788A CN102340910A (en) | 2010-07-28 | 2010-07-28 | Light emitting diode control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102430788A CN102340910A (en) | 2010-07-28 | 2010-07-28 | Light emitting diode control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN102340910A true CN102340910A (en) | 2012-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102430788A Pending CN102340910A (en) | 2010-07-28 | 2010-07-28 | Light emitting diode control circuit |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2901774Y (en) * | 2006-03-27 | 2007-05-16 | 久铁工业股份有限公司 | Safety controller for LED lamp |
| CN2935706Y (en) * | 2006-04-28 | 2007-08-15 | 光阳工业股份有限公司 | LED car light control device |
| TW200735714A (en) * | 2006-03-07 | 2007-09-16 | Keeper Technology Co Ltd | Control circuit for light emitting diode (LED) devices |
| CN101043771A (en) * | 2006-03-20 | 2007-09-26 | 光阳工业股份有限公司 | Light-emitting diode car lamp device |
| CN101712297A (en) * | 2008-09-30 | 2010-05-26 | 株式会社小糸制作所 | Vehicular lamp |
-
2010
- 2010-07-28 CN CN2010102430788A patent/CN102340910A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200735714A (en) * | 2006-03-07 | 2007-09-16 | Keeper Technology Co Ltd | Control circuit for light emitting diode (LED) devices |
| CN101043771A (en) * | 2006-03-20 | 2007-09-26 | 光阳工业股份有限公司 | Light-emitting diode car lamp device |
| CN2901774Y (en) * | 2006-03-27 | 2007-05-16 | 久铁工业股份有限公司 | Safety controller for LED lamp |
| CN2935706Y (en) * | 2006-04-28 | 2007-08-15 | 光阳工业股份有限公司 | LED car light control device |
| CN101712297A (en) * | 2008-09-30 | 2010-05-26 | 株式会社小糸制作所 | Vehicular lamp |
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Application publication date: 20120201 |