CN202617476U - Two-pin LED having open-circuit alternating function and electrostatic and surge protection function - Google Patents
Two-pin LED having open-circuit alternating function and electrostatic and surge protection function Download PDFInfo
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- CN202617476U CN202617476U CN 201220191245 CN201220191245U CN202617476U CN 202617476 U CN202617476 U CN 202617476U CN 201220191245 CN201220191245 CN 201220191245 CN 201220191245 U CN201220191245 U CN 201220191245U CN 202617476 U CN202617476 U CN 202617476U
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- electric crystal
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Abstract
The utility model discloses a two-pin LED having an open-circuit alternating function and an electrostatic and surge protection function, comprising an LED chip, a thyristor having three electrodes and parallel to the LED chip, such as an SCR, an electric crystal for providing a gate trigger signal to the thyristor and a voltage detection circuit. If an open circuit occurs in the LED chip, a proper current can be obtained by means of the voltage detection circuit to trigger the SCR, so that an alternate current path is provided and other LED chips in series connection with the LED chip can keep lighting. At the same time, if an electrostatic discharge or a surge occurs at two ends of the LED chip, the SCR can provide an electrostatic or surge conductive path, thereby achieving the function of protecting the LED chip.
Description
Technical field
The utility model is relevant with LED, is meant a kind of LED with open circuit alternative functions and static surge protection function of two pins especially.
Background technology
LED (Light Emitting Diode, light-emittingdiode) has extensively been applied to illumination, advertisement, industry and military affairs etc. and has been used, and becomes one of emphasis of electronic industry research and development; LED is a kind of semiconductor device, can directly convert electric energy to light, so LED often is used in the light emitting source of luminous indication or other electronic products; Yet the demand that is used in giant display (for example large-scale neon light or LCD backlight plate etc.) also increases gradually, and these application needs use a lot of LED, to provide giant display enough light sources; See also shown in Figure 1ly, be a kind of existing led circuit, it includes several LED1 that connects each other; And coupled in common is in a current source 2, because the characteristic of series connection makes the electric current of each LED1 that flows through identical; And then make the luminosity of each LED1 consistent, yet if one of them LED1 of this led circuit is damaged, the LED1 of damage can cause open circuit; Even other LED1 does not damage, still can't work in the block current path; And when the two ends of cascaded structure LED1 have static or surge to take place, tend to cause the damage of this LED1.
Prior art:
1、LED；
2, current source.
The utility model:
10, led chip;
20、 SCR；
30, electric crystal; 31, current-limiting resistance;
40, voltage checking circuit; 41, first resistance;
42, second resistance;
50, diode;
60, Xiao Ke Lay diode;
70、 PUT；
80, electric crystal; 81, current-limiting resistance;
100, LED; 101, pin;
200, current source.
The utility model content
In order to solve the problems of the technologies described above, the utility model provides a kind of LED with open circuit alternative functions and static surge protection function of two pins.
The LED with open circuit alternative functions and static surge protection function of two pins of the utility model, it includes:
One LED (Light Emitting Diode, light-emittingdiode) chip;
One SCR (Silicon-Controlled Rectifier , thyristor); It is one to have the thyristor (thyristor) of three electrodes; Wherein this SCR is parallelly connected with this led chip coupling; The anode of this SCR is connected with the anode of this led chip, and the negative electrode of this SCR then is connected with the negative electrode of this led chip;
One electric crystal is the electric crystal of a NPN type, and the emitter-base bandgap grading of this electric crystal is connected to the gate of this SCR, and the collection utmost point of this electric crystal then is connected with the anode of this SCR;
One voltage checking circuit; It is connected in series the bleeder circuit that forms by one first resistance with one second resistance; Wherein the base stage of this electric crystal is connected with an end of this first resistance and an end of this second resistance jointly; The other end of this first resistance is connected with the anode of this SCR in addition, and the other end of this second resistance then is connected with the negative electrode of this SCR.
As optimal technical scheme, wherein be provided with a current-limiting resistance between the anode of the collection utmost point of this electric crystal and this SCR.
As optimal technical scheme, wherein this led chip, this SCR, this electric crystal and this voltage checking circuit are formed on the same substrate, encapsulate, and constitute the LED of an integrated and combined type.
The present invention also provides a kind of LED with open circuit alternative functions and static surge protection function of two pins, and it includes:
One LED (Light Emitting Diode, light-emittingdiode) chip;
One PUT (Programmable Unijunction Transistor; The single electric crystal that engages of programmed); It is one to have the thyristor (thyristor) of three electrodes; Wherein the anode of this PUT is connected with the anode of this led chip, and the negative electrode of this PUT then is connected with the negative electrode of this led chip;
One electric crystal is the electric crystal of a positive-negative-positive, and the emitter-base bandgap grading of this electric crystal is connected to the gate of this PUT, and the collection utmost point of this electric crystal then is connected with the anode of this PUT;
One voltage checking circuit; It is connected in series the bleeder circuit that forms by one first resistance with one second resistance; Wherein the base stage of this electric crystal is connected with an end of this first resistance and an end of this second resistance jointly; The other end of this first resistance is connected with the anode of this PUT in addition, and the other end of this second resistance then is connected with the negative electrode of this PUT.
As optimal technical scheme, wherein the anode of the collection utmost point of this electric crystal and this PUT between be provided with a current-limiting resistance.
When the open circuit damage takes place when the led chip in the series connection in the utility model; This LED can obtain this SCR of suitable current trigger by this voltage checking circuit, and another current path that substitutes is provided, feasible other normal led chips of connecting each other with this led chip; Still it is luminous to work; When the two ends of cascaded structure led chip had static or surge to take place, this SCR can provide the path of static or surge conducting, reaches the function of this led chip of protection simultaneously.
Description of drawings
Circuit diagram when the existing LED of Fig. 1 connects.
The circuit diagram of Fig. 2 the utility model first preferred embodiment.
Above-mentioned first preferred embodiment of Fig. 3 the utility model is packaged into the sketch map of the LED with two pins.
The application sketch map of above-mentioned first preferred embodiment of Fig. 4 the utility model.
The circuit diagram of coupling diode in above-mentioned first preferred embodiment of Fig. 5 the utility model.
The circuit diagram of coupling Xiao Ke Lay diode in above-mentioned first preferred embodiment of Fig. 6 the utility model.
The circuit diagram of Fig. 7 the utility model second preferred embodiment.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is described further so that those skilled in the art can better understand the utility model and implementing, but the embodiment that lifts not conduct to the qualification of the utility model.
See also shown in Figure 2; Circuit diagram for first preferred embodiment of the utility model; Its exposure has a kind of LED with open circuit alternative functions and static surge protection function of two pins; This LED is made up of a led chip 10, a SCR20, an electric crystal 30 and 40 of voltage checking circuits, wherein:
This led chip 10 is encapsulated LED not as yet, has anode and negative electrode.
This SCR (Silicon-Controlled Rectifier , thyristor) 20; Be thyristor (Thyristor) with three electrodes; And have an anode, a negative electrode and a gate; Wherein the anode of this SCR20 is connected with the anode of this led chip 10, and the negative electrode of this SCR20 then is connected with the negative electrode of this led chip 10.
This electric crystal 30; It is the electric crystal of a NPN type; The emitter-base bandgap grading of this electric crystal 30 is connected to the gate of this SCR20, and the collection utmost point of this electric crystal 30 then is connected with the anode of this SCR20, is provided with a current-limiting resistance 31 between the anode of the collection utmost point of this electric crystal 30 and this SCR20 in addition.
This voltage checking circuit 40; It is by one first resistance 41 and one second resistance, 42 formed bleeder circuits; Wherein the base stage of this electric crystal 30 is connected with an end of this first resistance 41 and an end of this second resistance 42 jointly; The other end of this first resistance 41 is connected with the anode of this SCR20 in addition, and the other end of this second resistance 42 then is connected with the negative electrode of this SCR20.
Please consult shown in Figure 3 again; Be packaged into the sketch map of the LED with two pins for the above-mentioned preferred embodiment of the utility model; Wherein above-mentioned led chip 10, SCR20, electric crystal 30 and voltage checking circuit 40 are formed on the same substrate jointly, encapsulate, promptly constitute the LED100 of an integrated and combined type; These LED100 two sides and the pin 101 that stretches out respectively can supply to electrically connect usefulness with outside power supply.
Please consult shown in Figure 4ly more simultaneously, be the use sketch map of the above-mentioned preferred embodiment of the utility model, after promptly the LED100 of the utility model and other a plurality of LED100 form and connect; Coupled in common is in a current source 200 again; When the open circuit damage took place the led chip in one of them LED100 10, this LED100 can obtain this SCR20 of suitable current trigger, the current path that provide another to substitute by this voltage checking circuit 40; Make the led chip 10 in other LED100 still can work luminous; When the two ends of this LED100 had static or surge to take place, this SCR20 can provide the path of static or surge conducting, reaches the function of this led chip 10 of protection simultaneously.
In addition when further preventing static discharge or this led chip 10 error-polarity connections, the backward current that is produced can produce damages to this led chip 10; The SCR20 of the utility model reverse diode (Diode) that more can be coupled, as shown in Figure 5, be the circuit diagram of the coupling diode of the above-mentioned preferred embodiment of the utility model; This SCR20 reverse diode 50 that is coupled; The anode of this diode 50 and the negative electrode of this SCR20 are joined, and the negative electrode of this diode 50 then joins with the anode of this SCR20, in order to do by this diode 50; Reach the effect of reverse protection; In addition the SCR of the utility model reverse Xiao Ke Lay diode (Shockley Diode) that also can be coupled is as shown in Figure 6, is the circuit diagram of the coupling diode of the above-mentioned preferred embodiment of the utility model; This SCR20 reverse Xiao Ke Lay diode 60 that is coupled; The anode of this Xiao Ke Lay diode 60 and the negative electrode of this SCR20 are joined, and the negative electrode of this Xiao Ke Lay diode 60 then joins with the anode of this SCR20, can reach the effect of reverse protection equally.
Please consult shown in Figure 7 again; Circuit diagram for another preferred embodiment of the utility model; It discloses the LED with open circuit alternative functions and static surge protection function of another kind of two pins, and this LED is made up of this led chip 10, a PUT 70, an electric crystal 80 and 40 of this voltage checking circuits, and above-mentioned led chip 10, PUT70, electric crystal 80 and voltage checking circuit 40 also can be formed on the same substrate; Constitute the LED of an integrated and combined type, wherein:
This led chip 10 is encapsulated LED not as yet, has anode and negative electrode.
This PUT70 (Programmable Unijunction Transistor; The single electric crystal that engages of programmed); It is similarly one have three electrodes thyristor (thyristor); Wherein the anode of this PUT70 is connected with the anode of this led chip 10, and the negative electrode of this PUT70 then is connected with the negative electrode of this led chip 10.
This electric crystal 80; It is the electric crystal of a positive-negative-positive; The emitter-base bandgap grading of this electric crystal 80 is connected to the gate of this PUT70, and the collection utmost point of this electric crystal 80 then is connected with the negative electrode of this PUT70, in addition the negative electrode of the collection utmost point of this electric crystal 80 and this PUT70 between be provided with a current-limiting resistance 81.
One voltage checking circuit 40; It is equally by first resistance 41 and second resistance, 42 formed bleeder circuits; Wherein the base stage of this electric crystal 80 is connected with an end of this first resistance 41 and an end of this second resistance 42 jointly; The other end of this first resistance 41 is connected with the anode of this PUT70 in addition, and the other end of this second resistance 42 then is connected with the negative electrode of this PUT70.
When the open circuit damage took place the led chip among this LED 10, this LED also can obtain this PUT70 of suitable current trigger, the current path that provide another to substitute by this voltage checking circuit 40; Simultaneously when the two ends of led chip 10 have static or surge to take place; Across the anode of this LED and the voltage between negative electrode, provide the base stage of this electric crystal 80 to produce electric current, make the emitter-base bandgap grading of this electric crystal 80 produce enough electric currents; And then make the gate of this PUT70 be triggered; This PUT70 begins transition, and the electric current of lightning surge or static flows to this PUT70 by the anode of this PUT70, and is flowed out by the negative electrode of this PUT70; Make this PUT70 that the path of static or surge conducting can be provided, reach the function of protecting this led chip 10.
Now, again the characteristic and the attainable expection effect thereof of the utility model are stated as follows:
1, the LED with open circuit alternative functions and static surge protection function of two pins of the utility model; When the open circuit damage takes place in this led chip; This LED can obtain suitable current trigger thyristor SCR or PUT by this voltage checking circuit; Another current path that substitutes is provided, makes the LED of other series connection still can work luminous.
2, the LED with open circuit alternative functions and static surge protection function of two pins of the utility model; When lightning surge or static invasion; Can obtain appropriate current by this voltage checking circuit in the LED, trigger thyristor SCR or PUT, form conducting; And the path of lightning surge or electrostatic conducting is provided, reach the function of protection led chip.
The above embodiment is the preferred embodiment that proves absolutely that the utility model is lifted, and the protection range of the utility model is not limited thereto.Being equal to that the technical staff in present technique field is done on the utility model basis substitutes or conversion, all within the protection range of the utility model.The protection range of the utility model is as the criterion with claims.
Claims (5)
1. the LED with open circuit alternative functions and static surge protection function of a pin is characterized in that, includes:
One led chip;
One SCR, it is one to have the thyristor of three electrodes, and wherein this SCR is parallelly connected with this led chip coupling, and the anode of this SCR is connected with the anode of this led chip, and the negative electrode of this SCR then is connected with the negative electrode of this led chip;
One electric crystal is the electric crystal of a NPN type, and the emitter-base bandgap grading of this electric crystal is connected to the gate of this SCR, and the collection utmost point of this electric crystal then is connected with the anode of this SCR;
One voltage checking circuit; It is connected in series the bleeder circuit that forms by one first resistance with one second resistance; Wherein the base stage of this electric crystal is connected with an end of this first resistance and an end of this second resistance jointly; The other end of this first resistance is connected with the anode of this SCR in addition, and the other end of this second resistance then is connected with the negative electrode of this SCR.
2. according to the LED with open circuit alternative functions and static surge protection function of described a kind of two pins of claim 1, it is characterized in that, be provided with a current-limiting resistance between the collection utmost point of this electric crystal and the anode of this SCR.
3. according to the LED with open circuit alternative functions and static surge protection function of described a kind of two pins of claim 1; It is characterized in that; This led chip, this SCR, this electric crystal and this voltage checking circuit are formed on the same substrate; Encapsulate, and constitute the LED of an integrated and combined type.
4. the LED with open circuit alternative functions and static surge protection function of a pin is characterized in that, includes:
One led chip;
One PUT, it is one to have the thyristor of three electrodes, and wherein the anode of this PUT is connected with the anode of this led chip, and the negative electrode of this PUT then is connected with the negative electrode of this led chip;
One electric crystal is the electric crystal of a positive-negative-positive, and the emitter-base bandgap grading of this electric crystal is connected to the gate of this PUT, and the collection utmost point of this electric crystal then is connected with the anode of this PUT;
One voltage checking circuit; It is connected in series the bleeder circuit that forms by one first resistance with one second resistance; Wherein the base stage of this electric crystal is connected with an end of this first resistance and an end of this second resistance jointly; The other end of this first resistance is connected with the anode of this PUT in addition, and the other end of this second resistance then is connected with the negative electrode of this PUT.
5. according to the LED with open circuit alternative functions and static surge protection function of described a kind of two pins of claim 4, it is characterized in that, be provided with a current-limiting resistance between the collection utmost point of this electric crystal and the anode of this PUT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220191245 CN202617476U (en) | 2012-05-02 | 2012-05-02 | Two-pin LED having open-circuit alternating function and electrostatic and surge protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220191245 CN202617476U (en) | 2012-05-02 | 2012-05-02 | Two-pin LED having open-circuit alternating function and electrostatic and surge protection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202617476U true CN202617476U (en) | 2012-12-19 |
Family
ID=47351140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220191245 Expired - Fee Related CN202617476U (en) | 2012-05-02 | 2012-05-02 | Two-pin LED having open-circuit alternating function and electrostatic and surge protection function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202617476U (en) |
-
2012
- 2012-05-02 CN CN 201220191245 patent/CN202617476U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121219 Termination date: 20160502 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |