CN204090219U - A kind of overheating protection circuit of LED - Google Patents
A kind of overheating protection circuit of LED Download PDFInfo
- Publication number
- CN204090219U CN204090219U CN201420394919.9U CN201420394919U CN204090219U CN 204090219 U CN204090219 U CN 204090219U CN 201420394919 U CN201420394919 U CN 201420394919U CN 204090219 U CN204090219 U CN 204090219U
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- led
- circuit
- overheating protection
- protection circuit
- luminescence component
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- Y02B20/42—
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Abstract
A kind of overheating protection circuit of LED; control switch is made with semiconductor switch tube device; to be connected in the bleeder circuit that LED luminescence component is made up of resistance and thermistor in parallel, the temperature of LED is sampled; when the heating that LED luminescence component in LED causes because of reasons such as electric current increases is to set point; driving power is inputted positive and negative two terminal shortcircuits of LED luminescence component by semiconductor switch tube device, and protection LED luminescence component is from damage.
Description
Technical field
The present invention relates to a kind of illumination application, the particularly overheating protection circuit of LED.
Background technology
Semiconductor light-emitting-diode LED, as the light source of a new generation, has the long-life, energy saving, rich color, and colorimetric purity is high, is easy to regulate brightness, and antidetonation is shock-resistant, compact, is easy to form distinguishing feature and the advantages such as point, line, surface illumination group combined lamps.LED light is composed without infrared ray, ultraviolet radiation, the more mercury pollution of unstressed configuration lamp.LED is as the light source of a new generation, more in widespread attention, has obtained development at full speed especially in recent years.
The fluorescent lighting lamp that the LED illumination lamp of semiconductor substitutes low pressure gaseous discharge has been a kind of trend.The special feature development for LED component has gone out the LED driver of numerous types, and panoramic illuminating lamp is formed together with LED component, comprising the LED similar to conventional fluorescent profile, be arranged on existing florescent lamp fitting and form new LED illumination lamp.More there is the LED lamp tube directly utilizing and drive the ballast of fluorescent lamp to carry out driving LED luminescence component to transform existing fluorescent lighting lamp.
When the operating current of the LED luminescence component in LED exceedes its rated value for a long time, the temperature overheating of generation is the main cause causing LED luminescence component to damage.
Patent CN201114899Y LED over-heat protection circuit; propose a kind of in communication power supply path or in the driving power path of light-emitting diode; the method of set temperature control switch, cuts off the driving power of power supply or cut-out light-emitting diode when light-emitting diode is overheated.
Patent CN201571237U LED overheating protection circuit, when making LED overheated with thermistor, makes the method for the transistor disconnection be serially connected in LED direct current supply path, cuts off driving power when light-emitting diode is overheated.
Patent CN103001177A LED lamp overheating protection circuit, adopts discrete component to form, and when LED is overheated, by the conversion of two switching tube on off operating modes, cuts off LED constant current source loop, reach the object of overtemperature protection with relay.
Different from the existing various LED method for excessive heating protection making LED open a way generally adopted; the present invention proposes a kind of overheating protection circuit of LED; sampling element is made with the resitstance voltage divider including thermistor being connected on LED luminescence component two ends; when the temperature of LED arrives limit value; sampling voltage will be connected in the semiconductor switch pipe triggering and conducting on LED luminescence component in parallel; the electric current of LED luminescence component is flow through in bypass, and protection LED luminescence component is not damaged in the overheated abnormality of appearance.
Summary of the invention
The overheating protection circuit technical problem to be solved of a kind of LED of the present invention is when LED occurs overheated, and protection LED luminescence component is not damaged.
The overheating protection circuit of a kind of LED of the present invention is being connected to the adjunct circuit in the LED luminescence component on direct current driving power supply; be connected in the positive and negative two ends that direct current driving power supply exports in parallel; overheating protection circuit is made up of semiconductor switch circuit and electric resistance partial pressure sample circuit; pressure sampling circuit is serially connected with thermistor; when LED luminescence component temperature is too high; electric resistance partial pressure sample circuit exports the direct voltage raised with temperature, turn on-switch circuit, short circuit direct current driving power supply.
Described switching circuit; it is the anode connection power positive end of semiconductor switching tube Q1; negative electrode connects power supply negative terminal, controls pole and is connected with the electric resistance partial pressure point of electric resistance partial pressure sample circuit through a voltage lifting diode D1, the anode of switching tube Q1 and negative electrode are connected in parallel protection electric capacity.
Described electric resistance partial pressure sample circuit, is between the positive pole and negative pole of LED luminescence component, is connected in series a thermistor and divider resistance, and on divider resistance, is connected in parallel delay electric capacity.
Described switching tube Q1 is silicon-controlled device, or bipolar transistor or field-effect transistor.
It is bidirectional trigger diode that described voltage promotes diode D1, or voltage stabilizing didoe.
Thermistor in described electric resistance partial pressure sample circuit is the thermistor of negative temperature system, is serially connected in the anode of DC power supply; Or be semistor, be serially connected in the negative terminal of DC power supply.
The utility model has the advantages that, its rated value can not be exceeded for a long time because of the operating current of the LED luminescence component in LED, the temperature overheating of generation, and cause damaging LED luminescence component.
Accompanying drawing explanation
Fig. 1 is LED overheating protection circuit figure of the present invention.
Fig. 2 is the LED overheating protection circuit figure with semistor sampling
Number in the figure explanation
。
Embodiment
Refer to shown in accompanying drawing 1; described overheating protection circuit 1 is made up of semiconductor switch circuit 10 and electric resistance partial pressure sample circuit 11; together with LED luminescence component 3; be connected in parallel on the positive and negative two ends of driving power 2 output; when LED luminescence component temperature is too high; switching circuit is connected, and short circuit driving power 2 puts on the voltage of LED luminescence component 3.
Described switching circuit 10; it is the anode connection power positive end of semiconductor switching tube Q1; negative electrode connects power supply negative terminal; control pole to be connected with the electric resistance partial pressure sampling point A of electric resistance partial pressure sample circuit 11 through a voltage lifting diode D1, the anode of switching tube Q1 and negative electrode are connected in parallel protection electric capacity C1.Protection electric capacity C1 absorbs the high voltage transient that LED may occur, protection switch pipe Q1 is not damaged.
Described electric resistance partial pressure sample circuit 11 is connected to thermistor R1 on LED luminescence component LEDs positive pole and negative pole and divider resistance R2, divider resistance R2 is connected in parallel and postpones electric capacity C2, the transient voltage that delay electric capacity C2 prevents dividing potential drop sampling point A from producing causes switching tube Q1 false triggering.
Described switching tube Q1 is silicon-controlled device, or bipolar transistor or field-effect transistor.
It is bidirectional trigger diode that described voltage promotes diode D1, or voltage stabilizing didoe.
Thermistor R1 in described electric resistance partial pressure sample circuit 11 is the thermistor of negative temperature system, is connected with the positive pole of LED luminescence component, and divider resistance R2 is connected with the negative pole of LED luminescence component; Or the thermistor R1 in described electric resistance partial pressure sample circuit 11 is the thermistor of positive temperature system, is connected with the negative pole of LED luminescence component, and divider resistance R2 is connected with the positive pole of LED luminescence component.
Concrete annexation is:
The anode of described semiconductor switch pipe Q1 and input voltage positive input terminal+, protection electric capacity C1 one end, one end of negative tempperature coefficient thermistor R1, and the anode of LED luminescence component LEDS is connected.The negative electrode of semiconductor switch pipe Q1 with and input voltage negative input end-, the other end of protection electric capacity C1, one end of divider resistance R2, the negative terminal of one end and LED luminescence component LEDS of postponing electric capacity C2 links together.The control pole of semiconductor switch pipe Q1 connects one end that voltage promotes diode D1, voltage promotes diode D1 other end contact resistance dividing potential drop sampling point A, the i.e. other end of divider resistance R2, the other end of negative tempperature coefficient thermistor R1, and the other end postponing electric capacity C1.
Negative tempperature coefficient thermistor R1 resistance when perception LED overheated reduces; when the voltage that the resitstance voltage divider be made up of negative tempperature coefficient thermistor R1 and divider resistance R2 being connected on LED luminescence component two ends obtains be elevated to promote the conducting voltage of the trigger voltage of diode D1 and semiconductor switch pipe Q1 by voltage time; semiconductor switch pipe Q1 conducting; by the voltage short circuit of input LED luminescence component; thus the heating that causes because of reasons such as electric current increases of LED luminescence component in LED to set point time, protection LED luminescence component is from damage.
Accompanying drawing 2 samples the overheating protection circuit figure that dividing potential drop thermistor R1 is semistor.The anode of described semiconductor switch pipe Q1 and input voltage positive input terminal+, protection electric capacity C1 one end, one end of resistance R2, and the anode of LED luminescence component LEDS is connected.The negative electrode of semiconductor switch pipe Q1 with and input voltage negative input end-, the other end of protection electric capacity C1, one end of semistor R1, the negative terminal of one end and LED luminescence component LEDS of postponing electric capacity C2 links together.The control pole of semiconductor switch pipe Q1 connects one end that voltage promotes diode D1, and voltage promotes diode D1 other end contact resistance dividing potential drop sampling point A, i.e. the other end of divider resistance R1, the other end of thermistor R1, and the other end postponing electric capacity C1.
Claims (6)
1. the overheating protection circuit of a LED; direct current driving power supply is connected to LED luminescence component; it is characterized in that; overheating protection circuit is connected in the positive and negative two ends that direct current driving power supply exports in parallel, and overheating protection circuit is made up of semiconductor switch circuit and electric resistance partial pressure sample circuit, and pressure sampling circuit is serially connected with thermistor; when LED luminescence component temperature is too high; electric resistance partial pressure sample circuit exports the direct voltage raised with temperature, turn on-switch circuit, short circuit direct current driving power supply.
2. by the overheating protection circuit of LED according to claim 1; it is characterized in that; described switching circuit; it is the anode connection power positive end of semiconductor switching tube Q1; negative electrode connects power supply negative terminal; control pole to be connected with the electric resistance partial pressure point of electric resistance partial pressure sample circuit through a voltage lifting diode D1, the anode of switching tube Q1 and negative electrode are connected in parallel protection electric capacity.
3. by the overheating protection circuit of LED according to claim 1; it is characterized in that, described electric resistance partial pressure sample circuit, is between the positive pole and negative pole of LED luminescence component; be connected in series a thermistor and divider resistance, and on divider resistance, be connected in parallel delay electric capacity.
4. by the overheating protection circuit of LED according to claim 2, it is characterized in that, described switching tube Q1 is silicon-controlled device, or bipolar transistor or field-effect transistor.
5. by the overheating protection circuit of LED according to claim 2, it is characterized in that, it is bidirectional trigger diode that described voltage promotes diode D1, or voltage stabilizing didoe.
6., by the overheating protection circuit of LED according to claim 3, it is characterized in that, the thermistor in described electric resistance partial pressure sample circuit is the thermistor of negative temperature system, is serially connected in the anode of DC power supply; Or be semistor, be serially connected in the negative terminal of DC power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420394919.9U CN204090219U (en) | 2014-07-17 | 2014-07-17 | A kind of overheating protection circuit of LED |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420394919.9U CN204090219U (en) | 2014-07-17 | 2014-07-17 | A kind of overheating protection circuit of LED |
Publications (1)
| Publication Number | Publication Date |
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| CN204090219U true CN204090219U (en) | 2015-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420394919.9U Expired - Fee Related CN204090219U (en) | 2014-07-17 | 2014-07-17 | A kind of overheating protection circuit of LED |
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| CN (1) | CN204090219U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105188188A (en) * | 2015-08-06 | 2015-12-23 | 上海阿卡得电子有限公司 | Arc prevention circuit of LED lamp tube |
| WO2017013255A1 (en) * | 2015-07-23 | 2017-01-26 | Osram Oled Gmbh | Optoelectronic component and method for operating an optoelectronic component |
| CN108934103A (en) * | 2017-05-25 | 2018-12-04 | 通用电气照明解决方案有限公司 | The circuit of LED light |
| CN108954022A (en) * | 2017-05-22 | 2018-12-07 | 通用电气照明解决方案有限公司 | LED light and temperature-control circuit applied to the LED light |
| NL1043346B1 (en) * | 2019-07-25 | 2021-02-10 | Stogger Bv | Improved electronic control circuit for LEDs and similar power devices. |
-
2014
- 2014-07-17 CN CN201420394919.9U patent/CN204090219U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017013255A1 (en) * | 2015-07-23 | 2017-01-26 | Osram Oled Gmbh | Optoelectronic component and method for operating an optoelectronic component |
| US10529785B2 (en) | 2015-07-23 | 2020-01-07 | Osram Oled Gmbh | Optoelectronic component and method for operating an optoelectronic component |
| CN105188188A (en) * | 2015-08-06 | 2015-12-23 | 上海阿卡得电子有限公司 | Arc prevention circuit of LED lamp tube |
| CN108954022A (en) * | 2017-05-22 | 2018-12-07 | 通用电气照明解决方案有限公司 | LED light and temperature-control circuit applied to the LED light |
| CN108954022B (en) * | 2017-05-22 | 2021-07-23 | 卡任特照明解决方案有限公司 | LED lamp and temperature control circuit applied to same |
| CN108934103A (en) * | 2017-05-25 | 2018-12-04 | 通用电气照明解决方案有限公司 | The circuit of LED light |
| NL1043346B1 (en) * | 2019-07-25 | 2021-02-10 | Stogger Bv | Improved electronic control circuit for LEDs and similar power devices. |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180824 Address after: 201100 room 3, 2 building, 7001 Chung Chun Road, Minhang District, Shanghai, G3139 Patentee after: GUYUAN PHOTOELECTRIC TECHNOLOGY (SHANGHAI) CO.,LTD. Address before: Room 301, room 700, 17, Daning Road, Zhabei District, Shanghai Patentee before: Zhang Xiuhong |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150107 |