CN205883643U - Overheated and current foldback circuit of LED lamp plain type - Google Patents
Overheated and current foldback circuit of LED lamp plain type Download PDFInfo
- Publication number
- CN205883643U CN205883643U CN201620734222.0U CN201620734222U CN205883643U CN 205883643 U CN205883643 U CN 205883643U CN 201620734222 U CN201620734222 U CN 201620734222U CN 205883643 U CN205883643 U CN 205883643U
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- led
- current
- led lamp
- overheated
- plain type
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model relates to an overheated and current foldback circuit of LED lamp plain type, including DC power supply DC and LED lamp, the anodal DC power supply DC that connects of LED lamp, its characterized in that: overheated and the current foldback circuit of a plain type is connected to negative pole at the LED lamp, the temperature that has the overheated and current foldback circuit of plain type detects structure and automatic disconnection LED lamp current hydraulic circuit, and the temperature detects the temperature signal that the structure will detect the LED lamp and sends into automatic disconnection LED lamp current hydraulic circuit, judges through automatic disconnection LED lamp current hydraulic circuit whether the LED lamp was in the stream mode, automatic cutout LED lamp current return circuit when being in the stream mode. The utility model discloses can solve the LED lamp and easily make LED take place the problem that the optical attenuation damaged even when the overcurrent, have that circuit structure is simple, low cost and extension LED lamp life's a beneficial effect.
Description
Technical field
This utility model relates to that a kind of LED plain type is overheated and current foldback circuit, is a kind of by easy deviding device
The LED lamp protection circuit of part composition.Belong to the innovative technology in electrical application technology field.
Background technology
At present, LED application is more and more extensive, and LED is referred to as forth generation lighting source or green light source, have energy-conservation,
The feature such as environmental protection, life-span length, volume are little, is widely used in the fields such as Landscape Lighting, outdoor lighting, general lighting.
When the LED of use high brightness is as light source, LED can send substantial amounts of heat, and LED temperature is to life of product and peace
Most important.In normal conditions of use, the temperature that LED reaches it is expected to and calculate, but, when breaking down
Time, during such as LED overcurrent, too high temperature can be produced, make LED occur optical attenuation even to damage, affect systematic function.So needing
LED was carried out stream and overtemperature protection.
Utility model content
The purpose of this utility model, easily makes LED occur optical attenuation even to damage to solve LED when overcurrent
Problem, it is provided that a kind of LED plain type is overheated and current foldback circuit.Have the advantages that circuit structure is simple, with low cost.
The purpose of this utility model can reach by following technical solution:
A kind of LED plain type is overheated and current foldback circuit, and including DC source DC and LED, the positive pole of LED is even
Meeting DC source DC, its construction features is: the negative pole in LED connects that a plain type is overheated and current foldback circuit, described
Plain type is overheated and current foldback circuit has temperature detection structure and automatically disconnects LED current loop structure, temperature detection
The temperature signal of detection LED is sent into and is automatically disconnected LED current loop structure by structure, returns through automatically disconnecting LED electric current
Line structure judges whether LED is in over-current state, automatically cuts off LED current loop when being in over-current state.
The purpose of this utility model can reach by following technical solution:
Further, described plain type is overheated and current foldback circuit by resistance R1-R3, NPN type triode Q1-Q2 and just
Temperature coefficient thermistor RT1 is formed by connecting；The colelctor electrode of Q2 connects the negative pole of LED, base stage connects the colelctor electrode of Q1, transmitting
RT1 ground connection is passed through in pole, and the base stage of Q1 connects the emitter stage of Q2, grounded emitter, and RT1 is arranged in LED lamp panel, formed thermometric and
Cut off current loop structure；DC source DC connects the base stage of Q2 and the junction of Q1 colelctor electrode, R1 and R3 by resistance R1, R3
Junction by resistance R2 ground connection, form dividing potential drop and current supply circuit structure.
Further, described DC source DC is constant current source.
This utility model has the advantages that
1, this utility model connects at the negative pole of LED that a plain type is overheated and current foldback circuit, described plain type mistake
Heat and current foldback circuit have temperature detection structure and automatically disconnect LED current loop structure, and temperature detection structure will inspection
The temperature signal surveying LED sends into disconnection LED current loop structure automatically, sentences through automatically disconnecting LED current loop structure
Whether disconnected LED is in over-current state, automatically cuts off LED current loop when being in over-current state；Therefore, it is possible to solve LED
Lamp easily makes LED that the problem even damaged of optical attenuation occurs when overcurrent, has circuit structure simple, with low cost and extend
The beneficial effect in LED service life.
2, this utility model is formed by connecting by cheap discrete electronic component, and circuit structure is simple.Can protected LED mistake
Heat and overcurrent damage.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams that this utility model is embodied as.
Detailed description of the invention
Below in conjunction with drawings and Examples, this utility model is described in further detail:
Specific embodiment 1:
With reference to Fig. 1, the present embodiment includes DC source DC and LED, and the positive pole of LED connects DC source DC, at LED
The negative pole of lamp connects that a plain type is overheated and current foldback circuit, and described plain type is overheated and current foldback circuit has temperature inspection
Geodesic structure and automatically disconnection LED current loop structure, temperature detection structure will detect the temperature signal of LED and send into from dynamic circuit breaker
Open LED current loop structure, judge whether LED is in over-current state through automatically disconnecting LED current loop structure, work as place
LED current loop is automatically cut off when over-current state.
In the present embodiment:
Described plain type is overheated and current foldback circuit is by resistance R1-R3, NPN type triode Q1-Q2 and positive temperature coefficient
Critesistor RT1 is formed by connecting；The colelctor electrode of Q2 connects the negative pole of LED, base stage connects the colelctor electrode of Q1, emitter stage passes through
RT1 ground connection, the base stage of Q1 connects the emitter stage of Q2, grounded emitter, and RT1 is arranged in LED lamp panel, forms thermometric and cuts off electricity
Fluid loop structure；DC source DC connects the base stage of Q2 and the junction of Q1 colelctor electrode, the connection of R1 Yu R3 by resistance R1, R3
Place, by resistance R2 ground connection, forms dividing potential drop and current supply circuit structure.Described DC source DC is constant current source.
The operation principle of the present embodiment is as follows:
When LED normally works, Q2 saturation conduction, within the temperature range of setting, owing to the resistance of RT1 is the least, RT1 two ends
Voltage less than VBE, off state at Q1.If abnormal conditions occurs in circuit, as stream output occurred in constant current source, cause LED
There is superheating phenomenon in lamp, and the resistance of RT1 can increase rapidly, and when temperature is increased to certain value, Q1 saturation conduction, Q2 turns off, and protects
Protect LED without damage.This circuit can control the height of Thermal shutdown threshold value by regulation RT1 resistance.
The above, only this utility model preferably specific embodiment, but protection domain of the present utility model not only office
It is limited to this, in the range of this utility model discloses, conceives according to the technical solution of the utility model and utility model thereof in addition
Equivalent or change, broadly fall into protection domain of the present utility model.
Claims (3)
1. LED plain type is overheated and a current foldback circuit, and including DC source DC and LED, the positive pole of LED connects
DC source DC, it is characterised in that: the negative pole in LED even pulls out that a plain type is overheated and current foldback circuit, described plain type
Overheated and current foldback circuit has temperature detection structure and automatically disconnects LED current loop structure, and temperature detection structure will
The temperature signal of detection LED is sent into and is automatically disconnected LED current loop structure, through automatically disconnecting LED current loop structure
Judge whether LED is in over-current state, automatically cut off LED current loop when being in over-current state.
The most according to claim 1, a kind of LED plain type is overheated and current foldback circuit, it is characterised in that: described simply
Formula is overheated and current foldback circuit is by resistance R1-R3, NPN type triode Q1-Q2 and semistor RT1 connection
Become；The colelctor electrode of Q2 connects the negative pole of LED, base stage connects the colelctor electrode of Q1, emitter stage is connected by RT1 ground connection, the base stage of Q1
Connecing the emitter stage of Q2, grounded emitter, RT1 is arranged in LED lamp panel, forms thermometric and cuts off current loop structure；Unidirectional current
Source DC connects the base stage of Q2 and the junction of Q1 colelctor electrode by resistance R1, R3, and resistance R2 ground connection is passed through in the junction of R1 Yu R3,
Form dividing potential drop and current supply circuit structure.
A kind of LED plain type the most according to claim 1 or claim 2 is overheated and current foldback circuit, it is characterised in that: described directly
Stream power supply DC is constant current source.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2015208092711 | 2015-10-17 | ||
| CN201520809271 | 2015-10-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205883643U true CN205883643U (en) | 2017-01-11 |
Family
ID=57695775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620734222.0U Active CN205883643U (en) | 2015-10-17 | 2016-07-11 | Overheated and current foldback circuit of LED lamp plain type |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205883643U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108811231A (en) * | 2017-05-05 | 2018-11-13 | 东莞艾笛森光电有限公司 | Dim optimized emission diode drive circuit |
| JPWO2020241247A1 (en) * | 2019-05-28 | 2020-12-03 |
-
2016
- 2016-07-11 CN CN201620734222.0U patent/CN205883643U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108811231A (en) * | 2017-05-05 | 2018-11-13 | 东莞艾笛森光电有限公司 | Dim optimized emission diode drive circuit |
| JPWO2020241247A1 (en) * | 2019-05-28 | 2020-12-03 | ||
| WO2020241247A1 (en) * | 2019-05-28 | 2020-12-03 | 株式会社村田製作所 | Led driving circuit |
| JP7184183B2 (en) | 2019-05-28 | 2022-12-06 | 株式会社村田製作所 | LED drive circuit |
| US11785686B2 (en) | 2019-05-28 | 2023-10-10 | Murata Manufacturing Co., Ltd. | LED drive circuit |
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| GR01 | Patent grant |