CN203352867U - Automatic protection structure for LED street lamp - Google Patents
Automatic protection structure for LED street lamp Download PDFInfo
- Publication number
- CN203352867U CN203352867U CN2013202903530U CN201320290353U CN203352867U CN 203352867 U CN203352867 U CN 203352867U CN 2013202903530 U CN2013202903530 U CN 2013202903530U CN 201320290353 U CN201320290353 U CN 201320290353U CN 203352867 U CN203352867 U CN 203352867U
- Authority
- CN
- China
- Prior art keywords
- led
- chip
- street lamp
- protection structure
- optical coupler
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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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
- Y02B20/72—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps in street lighting
Abstract
The utility model relates to the technical field of lighting equipment, and especially relates to an automatic protection structure for an LED street lamp. The structure comprises a plurality of groups of LED subsets which are in parallel connection, and a transformer which supplies power for the plurality of groups of LED subsets. The structure also comprises a detection and control unit which can scan currents of the plurality of groups of LED subsets in a grouping manner and can process the currents. The detection and control unit outputs a control signal to drive an optical coupler. The optical coupler is connected with the pre-stage control part of the transformer. The detection and control unit is provided with a chip U2, and a multi-channel analog switch selection module. The output end of the multi-channel analog switch selection module is fed back to the input end of the chip U2 through a current amplification circuit. The output of a PWM pin of the chip U2 is connected with the optical coupler through a regulation and control current circuit. According to the utility model, in the plurality of groups of LED subsets which are in parallel connection, a power supply can automatically reduce the corresponding current output of a group or string of LED in a condition that the group or string of LED is in a state of circuit break, so as to protect other LEDs from being damaged by a too high current.
Description
Technical field
The utility model relates to technical field of lighting fixtures, especially relates to LED street lamp technical field.
Background technology
The LED street lamp is an important application very in LED illumination, and under the prerequisite of energy saving, the trend that the LED street lamp replaces conventional road lamp is more and more obvious.At present, generally comprise the LED subset of many group parallel operations in the LED street lamp, comprise LED a string or the multi-series and parallel connection in the LED subset, during work, by the power management chip management and control, can realize regularly the lighting requirements such as break-make.Yet, in existing LED street lamp, lighting loop is full power operation from start to finish, when occurring in the situation that a group or several groups of LED subsets open circuit, the electric current that outputs to other remaining set LED subset will increase, at this moment excessive the burning or the event such as fire of causing of electric current easily occurring, thereby have potential safety hazard, has also affected the useful life of LED street lamp.
Summary of the invention
The purpose of this utility model is to overcome the defect of prior art, provide a kind of can be according under open circuit conditions, power supply reduces this LED street lamp automatic protection structure of organizing the output of corresponding electric current automatically.
For achieving the above object, the utility model adopts following technical scheme:
LED street lamp automatic protection structure; comprise the LED subset of organizing parallel operations and the transformer of powering to many group LED subsets more; comprise LED a string or the multi-series and parallel connection in the LED subset; but this automatic protection structure also comprises the electric current of Grouping scan LED subset the prosecution unit of processing; output control signal in prosecution unit drives an optical coupler, the prime control section of optical coupler connection transformer.
Such scheme is further: described prosecution unit has chip U2, multiway analog switch is selected module, multiway analog switch selects module to be connected between the power circuit of chip U2 and LED subset, multiway analog switch selects the output of module to feed back to the input of chip U2 through current amplification circuit, and the PWM pin output of chip U2 connects optical coupler through the regulate electrical current circuit.
The model of described chip U2 is TINY45, between the PWM pin output of chip U2 and regulate electrical current circuit, also embeds the shaping change-over circuit is arranged.
The model of described optical coupler is PC817.
It is 74HC4051D that described multiway analog switch is selected the model of module.
After adopting said structure, the utility model is in the LED subset of many group parallel operations, in the situation that wherein a group or a string LED open circuit, power supply can automatically reduce this group or go here and there corresponding electric current output, to reach excessive the damaging of other residue LED electric currents of protection, reduce potential safety hazard, also promote the useful life of LED street lamp; Simple in structure, easily to make, cost of investment is low, and effectively energy savings, have splendid Social benefit and economic benefit.
the accompanying drawing explanation:
Accompanying drawing 1 is frame principle figure of the present utility model;
The circuit diagram that accompanying drawing 2 is the utility model preferred embodiment.
embodiment:
Below in conjunction with accompanying drawing, the utility model is further illustrated:
Consult Fig. 1, shown in 2, the relevant LED street lamp of the utility model automatic protection structure, comprise the LED subset 1 of organizing parallel operations and the transformer 3 of powering to many group LED subsets 1 more, comprise LED a string or the multi-series and parallel connection in LED subset 1, but this automatic protection structure also comprises the electric current of Grouping scan LED subset 1 the prosecution unit of processing, but prosecution unit scan control is exported the electric current of arbitrary group of LED subset 1 and is read every group of separate current value, for knowing more afterwards after analyzing that whether one or more groups electric current is arranged wherein is whether abnormal, then drive optical coupler 7 according to detecting the output control signal, the prime control section of optical coupler 7 connection transformers 3, realize that thus the prime control section of transformer 3 exports correct electric current according to the signal adjustment of optical coupler 7.Reach power supply and automatically reduce this group or go here and there the output of corresponding electric current, to reach excessive the damaging of other residue LED electric currents of protection, reduce potential safety hazard, also promote the useful life of LED street lamp; Simple in structure, easily to make, cost of investment is low, and effectively energy savings, have splendid Social benefit and economic benefit.
In embodiment circuit shown in Fig. 2, described prosecution unit has chip U2, multiway analog switch is selected module 4, multiway analog switch selects module 4 to be connected between the power circuit of chip U2 and LED subset 1, and it is 74HC4051D that multiway analog switch is selected the model of module 4.On the power circuit of LED subset 1, connect by corresponding detection resistance, the output that detects resistance is connected to multiway analog switch through corresponding shunt resistance and selects on module 4, multiway analog switch selects the output of module 4 to feed back to the input of chip U2 through current amplification circuit 5, the PWM pin output of chip U2 connects optical coupler 7 through regulate electrical current circuit 6, and the model of optical coupler 7 is PC817.The model of chip U2 is TINY45, between the PWM pin output of chip U2 and regulate electrical current circuit 6, also embeds the shaping change-over circuit 2 be comprised of integrated circuit U5B, resistance R 18 and resistance R 19.
Embodiment circuit working shown in Fig. 2 is as follows:
Four groups of LED subset 1(of P1 termination can also be more groups certainly), comprise LED a string or the multi-series and parallel connection in each group LED subset 1.Every group of LED subset 1 separate current inputs to multiway analog switch by shunt resistance R9, R10, R11, R12 and selects module 4 after current sense resistor R4, R5, R6, R7, then by chip U2 scan control output, select wherein one group to carry out the electric current amplification to integrated circuit U5D, every group of separate current value read in the AD end input that exports again chip U2 to, chip U2 analyzes and knows whether that more afterwards wherein one or more groups electric current is whether abnormal, know that 1 string or multi-string LED in this group disconnect after analyzing again a group of current anomaly, the new PWM value of output after chip U2 calculates, through integrated circuit U5B, the shaping change-over circuit 2 that resistance R 18 and resistance R 19 form transfers new current value to, again with the power circuit of LED subset 1 on the total current value input regulate electrical current circuit 6 at V2 end place of resistance R 3 in integrated circuit U5A relatively, control subsequently the prime control section that optical coupler 7 outputs feed back to transformer 3, thereby adjust the electric current that output is correct, reaching power supply automatically reduces this group or goes here and there corresponding electric current output, to protect excessive the damaging of other residue LED electric currents.In the present embodiment, optical coupler 7 is also by voltage comparator circuit 8 connection transformer 3 outputs, and the integrated circuit U5C sampling rate in voltage comparator circuit 8 is than the magnitude of voltage of transformer 3 outputs; reach the pressure limiting effect; to export correct voltage, energy savings, protective circuit.In the present embodiment, the model of integrated circuit U5A, U5B, U5C, U5D is LM324.
Certainly; abovely in conjunction with execution mode, the utility model is described in detail; be only explanation technical conceive of the present utility model and characteristics; its purpose is to allow the person skilled in the art understand content of the present utility model and implemented; can not limit protection range of the present utility model with this; therefore the equivalence of doing according to the utility model Spirit Essence all changes or modifies, and all should be encompassed in protection range of the present utility model.
Claims (5)
1.LED street lamp automatic protection structure; comprise the LED subset (1) of organizing parallel operations and the transformers (3) of powering to many group LED subsets (1) more; comprise LED a string or the multi-series and parallel connection in LED subset (1); it is characterized in that: but this automatic protection structure also comprises the electric current of Grouping scan LED subset (1) the prosecution unit of processing; output control signal in prosecution unit drives an optical coupler (7), the prime control section of optical coupler (7) connection transformer (3).
2. LED street lamp automatic protection structure according to claim 1; it is characterized in that: described prosecution unit has chip U2, multiway analog switch is selected module (4); multiway analog switch selects module (4) to be connected between the power circuit of chip U2 and LED subset (1); multiway analog switch selects the output of module (4) to feed back to the input of chip U2 through current amplification circuit (5), and the PWM pin output of chip U2 connects optical coupler (7) through regulate electrical current circuit (6).
3. LED street lamp automatic protection structure according to claim 2, it is characterized in that: the model of described chip U2 is TINY45, between the PWM pin output of chip U2 and regulate electrical current circuit (6) also embedding shaping change-over circuit (2) is arranged.
4. LED street lamp automatic protection structure according to claim 1 and 2, it is characterized in that: the model of optical coupler (7) is PC817.
5. LED street lamp automatic protection structure according to claim 2 is characterized in that: it is 74HC4051D that multiway analog switch is selected the model of module (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202903530U CN203352867U (en) | 2013-05-25 | 2013-05-25 | Automatic protection structure for LED street lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202903530U CN203352867U (en) | 2013-05-25 | 2013-05-25 | Automatic protection structure for LED street lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203352867U true CN203352867U (en) | 2013-12-18 |
Family
ID=49752710
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013202903530U Expired - Fee Related CN203352867U (en) | 2013-05-25 | 2013-05-25 | Automatic protection structure for LED street lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203352867U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105307323A (en) * | 2014-06-23 | 2016-02-03 | 三菱电机株式会社 | Light source control device and light source control method |
-
2013
- 2013-05-25 CN CN2013202903530U patent/CN203352867U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105307323A (en) * | 2014-06-23 | 2016-02-03 | 三菱电机株式会社 | Light source control device and light source control method |
| US9743476B2 (en) | 2014-06-23 | 2017-08-22 | Mitsubishi Electric Corporation | Light source control device and light source control method |
| CN105307323B (en) * | 2014-06-23 | 2018-01-30 | 三菱电机株式会社 | Light source control device and light source control method |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131218 Termination date: 20170525 |