CN202111469U - LED series open circuit protecting circuit and television - Google Patents
LED series open circuit protecting circuit and television Download PDFInfo
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- CN202111469U CN202111469U CN2011202221284U CN201120222128U CN202111469U CN 202111469 U CN202111469 U CN 202111469U CN 2011202221284 U CN2011202221284 U CN 2011202221284U CN 201120222128 U CN201120222128 U CN 201120222128U CN 202111469 U CN202111469 U CN 202111469U
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Abstract
The utility model belongs to the field of circuit protection and provides an LED series open circuit protecting circuit and a television. By the aid of a voltage-stabilizing unit, a current limiting unit, a first switch tube, a shunting unit, a second switching tube, a power dissipation unit and a switch unit, when certain light emitting diode of an LED series circuit is in an open circuit condition, the purposes of enabling the whole LED series circuit to be kept in a stable operating state and to maintain low power consumption are realized, and the problems of influence on operating stability of an LED series circuit and high power consumption in the prior art are solved.
Description
Technical field
The utility model belongs to circuit protection field, relates in particular to a kind of LED series open protective circuit and television set.
Background technology
At present; (Light Emitting Diode LED) is widely used in the display device as light source light-emitting diode, and most display devices adopt the mode of a plurality of light-emitting diode series connection work to realize Presentation Function; Yet; A plurality of light-emitting diodes are in the process of tandem working, if one of them light-emitting diode open-circuit then can cause the whole LED series circuit to work.
Problem to above-mentioned LED series circuit existence; The technical scheme that prior art provides is in the LED series circuit, to adopt voltage-stabiliser tube to realize open circuit protecting function, when LED series circuit operate as normal, has little current in the voltage-stabiliser tube and flows through; Can strengthen the power consumption of entire circuit like this; When open circuit appearred in indivedual LED in the LED series circuit, the electric current of all the other light-emitting diodes was all concentrated and is flow through voltage-stabiliser tube, thereby caused the voltage-stabiliser tube heating serious; Life-span is short, influences the stability of whole LED series circuit.Therefore, there be LED series circuit job stability and the big problem of power consumption of influencing in prior art.
The utility model content
The purpose of the utility model is to provide a kind of LED series open protective circuit, is intended to solve that prior art exists influences LED series circuit job stability and the big problem of power consumption.
The utility model is achieved in that a kind of LED series open protective circuit, is connected in parallel with the light-emitting diode of LED series circuit, it is characterized in that said LED series open protective circuit comprises:
Voltage regulation unit, current limliting unit, first switching tube, dividing cell, second switch pipe, power dissipation unit and switch element;
The anode of the said light-emitting diode of input termination of said voltage regulation unit; The output of said voltage regulation unit is connected with the input of said current limliting unit; Said first control end of switching tube of the first output termination of said current limliting unit; The output of the said dividing cell of input termination of said first switching tube; The said first output end of switching tube ground connection, the control end of said second switch pipe is connected the output of the said power dissipation of the input termination unit of said second switch pipe simultaneously with the input of said dividing cell, the input of said power dissipation unit and the anode of said light-emitting diode; The input of said switch element is connected the output of said switch element and the negative electrode of said light-emitting diode with second output of said current limliting unit and the output of said second switch pipe simultaneously.
Another purpose of the utility model is to provide a kind of television set that comprises said LED series open protective circuit.
In the utility model; Through adopting voltage regulation unit, current limliting unit, first switching tube, dividing cell, second switch pipe, power dissipation unit and switch element; Realized when open circuit situation appears in a certain light-emitting diode of LED series circuit; Make the whole LED series circuit keep steady-working state and purpose low in energy consumption, what solved that prior art exists influences LED series circuit job stability and the big problem of power consumption.
Description of drawings
Fig. 1 is the modular structure figure of the LED series open protective circuit that provides of the utility model first embodiment;
Fig. 2 is the modular structure figure of the LED series open protective circuit that provides of the utility model second embodiment;
Fig. 3 is the exemplary circuit figure of the LED series open protective circuit that provides of the utility model the 3rd embodiment.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
The utility model embodiment is through adopting voltage regulation unit, current limliting unit, first switching tube, dividing cell, second switch pipe, power dissipation unit and switch element; Realized when open circuit situation appears in a certain light-emitting diode of LED series circuit; Make the whole LED series circuit keep steady-working state and purpose low in energy consumption, what solved that prior art exists influences LED series circuit job stability and the big problem of power consumption.
Be described in detail below in conjunction with the realization of specific embodiment the utility model:
Embodiment one:
Fig. 1 shows the modular structure of the LED series open protective circuit that the utility model embodiment provides, and for the ease of explanation, only shows the part relevant with the utility model embodiment, and details are as follows:
LED series open protective circuit 100 comprises:
The anode of the input sending and receiving optical diode LED1 of voltage regulation unit 101; The output of voltage regulation unit 101 is connected with the input of current limliting unit 102; The control end of the first output termination, first switching tube 103 of current limliting unit 102; The output of the input termination dividing cell 104 of first switching tube 103; The output head grounding of first switching tube 103, the control end of second switch pipe 105 is connected the output of the input termination power dissipation unit 106 of second switch pipe 105 simultaneously with the input of dividing cell 104, the input of power dissipation unit 106 and the anode of LED 1; The input of switch element 107 is connected with second output of current limliting unit 102 and the output of second switch pipe 105 simultaneously, and the output of switch element 107 is connected with the negative electrode of LED 1.
In the utility model embodiment; Through adopting voltage regulation unit 101, current limliting unit 102, first switching tube 103, dividing cell 104, second switch pipe 105, power dissipation unit 106 and switch element 107; Realized when open circuit situation appears in a certain light-emitting diode of LED series circuit; Make the whole LED series circuit keep steady-working state and purpose low in energy consumption, what solved that prior art exists influences LED series circuit job stability and the big problem of power consumption.
Embodiment two:
Fig. 2 shows the modular structure of the LED series open protective circuit that the utility model embodiment provides, and for the ease of explanation, only shows the part relevant with the utility model embodiment, and details are as follows:
LED series open protective circuit 200 comprises:
The anode of the input sending and receiving optical diode LED2 of voltage regulation unit 201; The output of voltage regulation unit 201 is connected with the input of current limliting unit 202; The control end of the first output termination, first switching tube 203 of current limliting unit 202; The output of the input termination dividing cell 204 of first switching tube 203, the output head grounding of first switching tube 203, the input of the control termination dividing cell 204 of second switch pipe 205; The anode of the input sending and receiving optical diode LED2 of power dissipation unit 206; The output of the input termination power dissipation unit 206 of second switch pipe 205, the input of switch element 207 is connected with second output of current limliting unit 202 and the output of second switch pipe 205 simultaneously, and the output of switch element 207 is connected with the negative electrode of LED 2; The input side joint of filter unit 208 is 202 first outputs in the current limliting unit; The output head grounding of filter unit 208, the anode of the input sending and receiving optical diode LED2 of partial pressure unit 209, the input of output termination dividing cell 204.
In the utility model embodiment; Through adopting voltage regulation unit 201, current limliting unit 202, first switching tube 203, dividing cell 204, second switch pipe 205, power dissipation unit 206, switch element 207, filter unit 208 and partial pressure unit 209; Realized when open circuit situation appears in a certain light-emitting diode of LED series circuit; Make the whole LED series circuit keep steady-working state and purpose low in energy consumption, what solved that prior art exists influences LED series circuit job stability and the big problem of power consumption.
Embodiment three:
Fig. 3 shows the exemplary circuit structure of the LED series open protective circuit that the utility model embodiment provides, and for the ease of explanation, only shows the part relevant with the utility model embodiment, and details are as follows:
LED series open protective circuit 300 comprises:
As the utility model one embodiment, voltage regulation unit 301 is a voltage stabilizing didoe Z1, and the negative electrode of voltage stabilizing didoe Z1 and anode are respectively the input and the output of voltage regulation unit 301.
As the utility model one embodiment; Current limliting unit 302 comprises resistance R 1 and resistance R 2; First end of resistance R 1 is the input of current limliting unit 302; Second end of resistance R 1 is first output of current limliting unit 302, second end of the first terminating resistor R1 of resistance R 2, and second end of resistance R 2 is second output of current limliting unit 302.
As the utility model one embodiment, first switching tube 303 is a NPN type triode Q1, and base stage, the collector and emitter of NPN type triode Q1 are respectively control end, input and the output of first switching tube 303.
As the utility model one embodiment, dividing cell 304 is a resistance R 4, and first end of resistance R 4 and second end are respectively the input and the output of dividing cell 304.
As the utility model one embodiment, second switch pipe 305 is a positive-negative-positive triode Q2, and base stage, the emitter and collector of positive-negative-positive triode Q2 are respectively control end, input and the output of second switch pipe 305.
As the utility model one embodiment, power dissipation unit 306 is a resistance R 5, and first end of resistance R 5 and second end are respectively the input and the output of power dissipation unit 306.
As the utility model one embodiment, switch element 307 is a diode D1, and the anode of diode D1 and negative electrode are respectively the input and the output of switch element 307.
As the utility model one embodiment, filter unit 308 is a capacitor C 1, and first end of capacitor C 1 is the input of filter unit 308, the second end ground connection of capacitor C 1.
As the utility model one embodiment, partial pressure unit 309 is a resistance R 3, and first end of resistance R 3 and second end are respectively the input and the output of partial pressure unit 309.
The operation principle of LED series open protective circuit 300 is:
When LED 3 operate as normal; The magnitude of voltage of voltage stabilizing didoe Z1 negative electrode is less than the voltage stabilizing value of himself, so voltage stabilizing didoe Z1 ends, and diode D1 instead ends partially simultaneously; NPN type triode Q1 ends because of the base stage no current flows into; Under the situation that NPN type triode Q1 ends, the emitter junction of positive-negative-positive triode Q2 does not have bias voltage, so positive-negative-positive triode Q2 also ends.
When LED 3 open circuits; The voltage of LED 3 anodes is greater than the voltage stabilizing value of voltage stabilizing didoe Z1; Voltage stabilizing didoe Z1 is reversed and punctures and conducting; Electric current is undertaken for NPN type triode Q1 bias current being provided after the filtering by capacitor C 1 through resistance R 1 and R2 current limliting, so NPN type triode Q1 conducting.Because the collector electrode of NPN type triode Q1 is connected with the base stage of positive-negative-positive triode Q2 through resistance R 4, under the situation of NPN type triode Q1 conducting, the base voltage of positive-negative-positive triode Q2 is dragged down, emitter junction positively biased, so also conducting of positive-negative-positive triode Q2.Behind LED 3 open circuits; The voltage of LED 3 negative electrodes is much smaller than the collector voltage of positive-negative-positive triode Q2, so diode D1 forward bias and conducting, and electric current flows to the next light-emitting diode of connecting with LED 3 in the LED series circuit through diode D1; Guarantee the operate as normal of other light-emitting diodes; In addition, because LED 3 open circuits, resistance R 5 replaces LED 3 and realizes power dissipation.
In the utility model embodiment, LED series open protective circuit of each light-emitting diode parallel connection in the LED series circuit is to reach the purpose of open-circuit-protection.
Another purpose of the utility model embodiment is to provide a kind of television set that comprises above-mentioned LED series open protective circuit.
In the utility model embodiment; Through adopting voltage regulation unit 301, current limliting unit 302, first switching tube 303, dividing cell 304, second switch pipe 305, power dissipation unit 306, switch element 307, filter unit 308 and partial pressure unit 309; Realized when open circuit situation appears in a certain light-emitting diode of LED series circuit; Make the whole LED series circuit keep steady-working state and purpose low in energy consumption, what solved that prior art exists influences LED series circuit job stability and the big problem of power consumption.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection range of the utility model.
Claims (10)
1. LED series open protective circuit is connected in parallel with the light-emitting diode of LED series circuit, it is characterized in that said LED series open protective circuit comprises:
Voltage regulation unit, current limliting unit, first switching tube, dividing cell, second switch pipe, power dissipation unit and switch element;
The anode of the said light-emitting diode of input termination of said voltage regulation unit; The output of said voltage regulation unit is connected with the input of said current limliting unit; Said first control end of switching tube of the first output termination of said current limliting unit; The output of the said dividing cell of input termination of said first switching tube; The said first output end of switching tube ground connection, the control end of said second switch pipe is connected the output of the said power dissipation of the input termination unit of said second switch pipe simultaneously with the input of said dividing cell, the input of said power dissipation unit and the anode of said light-emitting diode; The input of said switch element is connected with second output of said current limliting unit and the output of said second switch pipe simultaneously, and the output of said switch element is connected with the negative electrode of said light-emitting diode.
2. LED series open protective circuit as claimed in claim 1 is characterized in that, said LED series open protective circuit also comprises:
The input side joint is first output in the current limliting unit, the filter unit of output head grounding; And
The anode of input sending and receiving optical diode, the partial pressure unit of the input of output termination dividing cell.
3. LED series open protective circuit as claimed in claim 1 is characterized in that, said voltage regulation unit is a voltage stabilizing didoe Z1, and the negative electrode of said voltage stabilizing didoe Z1 and anode are respectively the input and the output of said voltage regulation unit.
4. LED series open protective circuit as claimed in claim 1; It is characterized in that; Said current limliting unit comprises resistance R 1 and resistance R 2, and first end of said resistance R 1 is the input of said current limliting unit, and second end of said resistance R 1 is first output of said current limliting unit; Second end of the said resistance R 1 of first termination of said resistance R 2, second end of said resistance R 2 are second output of said current limliting unit.
5. LED series open protective circuit as claimed in claim 1; It is characterized in that; Said first switching tube is a NPN type triode Q1, and base stage, the collector and emitter of said NPN type triode Q1 are respectively said first control end of switching tube, input and output;
Said second switch Guan Weiyi positive-negative-positive triode Q2, base stage, the emitter and collector of said positive-negative-positive triode Q2 are respectively control end, input and the output of said second switch pipe.
6. LED series open protective circuit as claimed in claim 1 is characterized in that, said dividing cell is a resistance R 4, and first end of said resistance R 4 and second end are respectively the input and the output of said dividing cell.
7. LED series open protective circuit as claimed in claim 1 is characterized in that, said power dissipation unit is a resistance R 5, and first end of said resistance R 5 and second end are respectively the input and the output of said power dissipation unit.
8. LED series open protective circuit as claimed in claim 1 is characterized in that, said switch element is a diode D1, and the anode of said diode D1 and negative electrode are respectively the input and the output of said switch element.
9. LED series open protective circuit as claimed in claim 2 is characterized in that, said filter unit is a capacitor C 1, and first end of said capacitor C 1 is the input of said filter unit, the second end ground connection of said capacitor C 1;
Said partial pressure unit is a resistance R 3, and first end of said resistance R 3 and second end are respectively the input and the output of said partial pressure unit.
10. a television set is characterized in that, said television set comprises any described LED series open protective circuit like claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202221284U CN202111469U (en) | 2011-06-28 | 2011-06-28 | LED series open circuit protecting circuit and television |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202221284U CN202111469U (en) | 2011-06-28 | 2011-06-28 | LED series open circuit protecting circuit and television |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202111469U true CN202111469U (en) | 2012-01-11 |
Family
ID=45436918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202221284U Expired - Lifetime CN202111469U (en) | 2011-06-28 | 2011-06-28 | LED series open circuit protecting circuit and television |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202111469U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849629A (en) * | 2017-02-28 | 2017-06-13 | 深圳市华星光电技术有限公司 | A kind of protection circuit and LED drive circuit |
-
2011
- 2011-06-28 CN CN2011202221284U patent/CN202111469U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849629A (en) * | 2017-02-28 | 2017-06-13 | 深圳市华星光电技术有限公司 | A kind of protection circuit and LED drive circuit |
| US10278257B2 (en) | 2017-02-28 | 2019-04-30 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Protection circuit and LED driving circuit |
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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: 20120111 |