CN203368805U - LED circuit - Google Patents
LED circuit Download PDFInfo
- Publication number
- CN203368805U CN203368805U CN2013202415950U CN201320241595U CN203368805U CN 203368805 U CN203368805 U CN 203368805U CN 2013202415950 U CN2013202415950 U CN 2013202415950U CN 201320241595 U CN201320241595 U CN 201320241595U CN 203368805 U CN203368805 U CN 203368805U
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- China
- Prior art keywords
- circuit
- led
- current circuit
- constant current
- led unit
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- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009993 protective function Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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Classifications
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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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model discloses a LED circuit. The circuit comprises a power supply converter and a LED unit. The power supply converter comprises a transformer, a bridge, a constant current circuit and a thermistor. A high level output terminal of the bridge is connected in series with the LED unit and then is connected with a first terminal of the constant current circuit. A low level output terminal of the bridge is connected with a second terminal of the constant current circuit. A third terminal of the constant current circuit is connected with a collector electrode of a PNP transistor. An emitting electrode of the PNP transistor is connected with a cathode of the LED unit. The thermistor is connected between the emitting electrode and a base electrode of the PNP transistor. The circuit of the utility model has the advantage that the thermistor reduces a bias current of the collector electrode of the PNP transistor through a mode of increasing a resistance of the thermistor when the constant current circuit or the LED unit reaches a predetermined temperature or a higher temperature so that a constant current value of the constant current circuit is restricted or disconnected and safety of the LED is effectively protected, wherein the bias current flows into the constant current circuit.
Description
Technical field
The utility model relates to a kind of LED circuit.
Background technology
LED, because of characteristics such as low in energy consumption, life-span are long, is applied in more and more wide field, in lighting apparatus, adopts a plurality of LED to connect to obtain required illumination more; But the conventional LED circuit majority used in lighting apparatus does not have overheat protective function; in the situation that under hot environment and/or LED continue to use for a long time after the temperature short circuit between the cathode and anode that may cause the LED unit that raises, cause the damage of LED or the reduction in useful life.
The utility model content
The purpose of this utility model is to solve the problem that causes LED damage or reduction in useful life because of excess Temperature.
The technical solution of the utility model is such:
LED circuit, comprise power supply changeover device, LED unit, wherein:
Power supply changeover device, for AC-DC conversion, is the power supply of described LED unit;
The LED unit, be composed in series by a plurality of light-emitting diodes;
Described power supply changeover device, comprise: transformer, electric bridge, constant-current circuit and thermistor, the primary side of described transformer is for connecing alternating current, an input of the described electric bridge of secondary side one termination of described transformer, another input of the described electric bridge of its another termination; Behind the described LED of the high level output end string unit of described electric bridge, with the first end of described constant-current circuit, be connected, the low level output end of described electric bridge is connected with the second end of described constant-current circuit, the 3rd end of described constant-current circuit is connected with the transistorized collector electrode of PNP, the transistorized emitter of described PNP is connected with the negative electrode of described LED unit, and described thermistor is connected between the transistorized emitter of described PNP and base stage.
The beneficial effects of the utility model are to arrive predetermined temperature or when higher when constant-current circuit or LED unit; the mode of passing through the rising self-resistance of thermistor reduces the bias current that the transistorized collector electrode of PNP flows into constant-current circuit; so that the constant current value of constant-current circuit is restricted or disconnects, effectively protect the safety of LED.
The accompanying drawing explanation
Fig. 1 is the utility model circuit diagram in one embodiment.
Embodiment
In order to make technical problem to be solved in the utility model, technical scheme and beneficial effect clearer.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
As shown in Figure 1, LED circuit, comprise power supply changeover device, LED unit, wherein:
Power supply changeover device, for AC-DC conversion, is the power supply of described LED unit;
The LED unit, be composed in series by a plurality of light-emitting diodes;
Described power supply changeover device, comprise: transformer T, electric bridge UR, constant-current circuit and thermistor NTC, the primary side of described transformer T is for connecing alternating current, the input of the described electric bridge UR of secondary side one termination of described transformer T, another input of the described electric bridge UR of its another termination; Behind the described LED of the high level output end string unit of described electric bridge UR, with the first end a of described constant-current circuit, be connected, the low level output end of described electric bridge UR is connected with the second end b of described constant-current circuit, the 3rd end c of described constant-current circuit is connected with the collector electrode of PNP transistor Q, the emitter of described PNP transistor Q is connected with the negative electrode of described LED unit, and described thermistor NTC is connected between the emitter and base stage of described PNP transistor Q.
Optimize, also be connected with resistance R between the collector electrode of described constant-current circuit and described PNP transistor Q, for current limliting.
It should be noted that the full-wave rectifying circuit that described electric bridge UR is comprised of four diodes certainly, also can design other circuit with rectification effect and substitute.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., all should wrap in the utility model scope.
Claims (3)
1.LED circuit, comprise power supply changeover device, LED unit, wherein:
Power supply changeover device, for AC-DC conversion, is the power supply of described LED unit;
The LED unit, be composed in series by a plurality of light-emitting diodes;
It is characterized in that:
Described power supply changeover device, comprise: transformer, electric bridge, constant-current circuit and thermistor, the primary side of described transformer is for connecing alternating current, an input of the described electric bridge of secondary side one termination of described transformer, another input of the described electric bridge of its another termination; Behind the described LED of the high level output end string unit of described electric bridge, with the first end of described constant-current circuit, be connected, the low level output end of described electric bridge is connected with the second end of described constant-current circuit, the 3rd end of described constant-current circuit is connected with the transistorized collector electrode of PNP, the transistorized emitter of described PNP is connected with the negative electrode of described LED unit, and described thermistor is connected between the transistorized emitter of described PNP and base stage.
2. LED circuit as claimed in claim 1, is characterized in that, between described constant-current circuit and the transistorized collector electrode of described PNP, also is connected with resistance.
3. LED circuit as claimed in claim 1, is characterized in that, described electric bridge is comprised of four diodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202415950U CN203368805U (en) | 2013-05-08 | 2013-05-08 | LED circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202415950U CN203368805U (en) | 2013-05-08 | 2013-05-08 | LED circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203368805U true CN203368805U (en) | 2013-12-25 |
Family
ID=49816513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013202415950U Expired - Fee Related CN203368805U (en) | 2013-05-08 | 2013-05-08 | LED circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203368805U (en) |
-
2013
- 2013-05-08 CN CN2013202415950U patent/CN203368805U/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 | ||
| ASS | Succession or assignment of patent right |
Owner name: SHENZHEN RUIWANG OPTOELECTRONIC TECHNOLOGY CO., LT Free format text: FORMER OWNER: ZHANG XIAOJIE Effective date: 20140331 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20140331 Address after: Baoan District Dalang street, Shenzhen city 518000 Guangdong province community Dalang South Road Intentia Industrial Zone E F building, 1 floor Patentee after: Shenzhen Ruiwang Optoelectronic Co., Ltd. Address before: 518000, 126, South 704, Bai mang village, Shahe West Road, Shenzhen, Guangdong, Nanshan District Patentee before: Zhang Xiaojie |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131225 Termination date: 20160508 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |