CN203352914U - LED protection device - Google Patents
LED protection device Download PDFInfo
- Publication number
- CN203352914U CN203352914U CN2013204545361U CN201320454536U CN203352914U CN 203352914 U CN203352914 U CN 203352914U CN 2013204545361 U CN2013204545361 U CN 2013204545361U CN 201320454536 U CN201320454536 U CN 201320454536U CN 203352914 U CN203352914 U CN 203352914U
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- China
- Prior art keywords
- led
- operational amplifier
- current
- power supply
- circuit
- 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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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
- H05B45/56—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving measures to prevent abnormal temperature of the LEDs
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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 discloses an LED protection device The LED protection device is connected between an LED power supply and an LED lighting set, and comprises a resistor R1 for detecting the working current, a switching tube Q1 for controlling the connection and disconnection of the circuit, an operational amplifier U1, an operational amplifier U2, a diode D1 and a diode D2. According to the utility model, the LED protection device is directly connected between the LED power supply and the LED lighting set, and is capable of controlling the connection and disconnection of the circuit without waiting until a protection point of the LED power supply circuit is reached to start protection in case of over-voltage or short-circuit, thereby providing protection in time, preventing over-heating and ignition of lighting equipment, and ensuring the safety of the whole LED circuit.
Description
Technical field
The utility model relates to the LED lighting technical field, is specifically related to for avoiding circuit to cross a kind of LED protective device of electricity and excess temperature.
Background technology
The LED lamp is as the novel green lighting technology, have the advantages that light conversion efficiency is high, energy consumption is low, volume is little, the life-span is long, be applied to gradually various lighting fields, especially at advertising marker light, as the occasions such as letter lamp, sign board, advertising lamp box are used widely.The life-span length of LED lamp is based on safe operational environment, when LED can cause the LED lamp to lose efficacy when facing surge or crossing fire damage, affects its useful life.Cross the electric current that surge apply on LED and surpass the maximum rated current on this LED technical data handbook, comprise the surge of crossing that overcurrent and overvoltage cause.Cross fire damage and refer to that the components and parts in the LED light fixture cause losing efficacy under overheat condition, usually when the LED lamp met with surge, also can make components and parts wherein be subject to fire damage, affect the working life of LED.In the LED Lighting Design, have the electric energy that approaches 80% can be converted into heat energy, and the performance of LED and life-span and its working temperature closely related, temperature 10 degree that raise in LED chip usually, will decay life-span of 1%, LED of its luminous flux reduces 50%.Therefore, in the LED Lighting Design, must guarantee in the LED circuit for lamp to be designed with overcurrent protection or overheating protection circuit or device.
In LED protective device design process, common LED power supply a plurality of LED lamps of access of directly connecting, and in the LED power circuit, protective circuit is set, when starting protection the protection point of power circuit appears extremely touching and in circuit.Such circuit design is short at LED power source loads line; be that load LED lamp quantity can play fine protective action when few; but at LED power supply external load line length; while being external a plurality of LED lamp, there will be when short circuit; the power of short circuit does not also reach the protection point of LED power circuit and can't shield, and makes the LED circuit for lamp produce overheated and situation burning under the large electric current continued.And when the power of the power output of LED power supply and LED lamp does not mate; the protection point of more difficult shake-up LED power circuit when overcurrent; as the power supply over-current protection point at 200W reaches 300W when even higher; the bearing power of lamp but only has 100W even still less; because wiring is oversize; being difficult to reach the power protection point can't protect automatically, easily causes that in long-time overcurrent the overheated operation of components and parts even causes on fire, causes potential safety hazard.
Summary of the invention
The technical problems to be solved in the utility model be in relevant LED lighting technology, exist because LED power supply external load line is long; cause it to be surge or the protection point of the moving LED power circuit of movable contact and damage whole LED lighting circuit not while crossing fire damage; affect the deficiency in the useful life of LED lamp, provide a kind of for avoiding the LED circuit LED protective device of electricity excessively.
The utility model solves the technical scheme that its technical problem adopts: a kind of LED protective device, for accessing between LED power supply and LED lamp group, comprising:
Current detection component, the series connection access is between described LED power supply and LED lamp group, in order to detect the electrical current between described LED power supply and LED lamp group;
The switch control assembly, the series connection access is between described LED power supply and LED lamp group, in order to control the break-make between described LED power supply and LED lamp group;
Control assembly, be connected with described switch control assembly with described current detection component respectively, for the electrical current detected according to described current detection component, controls the break-make that described switch control assembly is controlled described LED lamp group and described LED power supply.
In LED protective device described in the utility model, described control assembly comprises self-locking unlock component for circuit being realized to self-locking and release and for the driving control assembly of driving switch control assembly;
Described driving control assembly is connected with described switch control assembly with described current detection component, receive the electrical current that described current detection component detects, when described electrical current exceeds the protection point, control described driving control assembly to drive described switch control assembly to disconnect the power supply of described LED power supply and described LED lamp group;
Described self-locking unlock component is connected with described driving control assembly with described current detection component; receive the electrical current that described current detection component detects; when described electrical current does not exceed the protection point, control described driving control assembly and drive described switch control assembly to recover the power supply of described LED power supply and described LED lamp group.
In LED protective device described in the utility model; described current detecting device is connected between described LED power supply and LED lamp group; for detection of passing through electric current, described current detecting device is current sense resistance, high molecular positive temp thermistor or overcurrent identification circuit.
In LED protective device described in the utility model, described switch control assembly is metal-oxide-semiconductor.
In LED protective device described in the utility model, described LED protective device comprises the resistance R 1 for detection of electrical current, switching tube Q1, operational amplifier U1, operational amplifier U2, diode D1 and the diode D2 of control circuit break-make;
Electric current flows into the inverting input 2 of operational amplifier U from described LED positive source, LED power cathode contact resistance R1 is to the in-phase input end 3 of operational amplifier U1, the output 1 of operational amplifier U1 connects the in-phase input end 3 of diode D2 to operational amplifier U1, in order to realize positive current feedback, to reach self-locking release purpose; The output 1 of operational amplifier U1 is by the inverting input 6 of diode D1 concatenation operation amplifier U2, the in-phase input end 5 of operational amplifier U2 connects the LED positive source, the output of operational amplifier U2 is electrically connected to switching tube Q1, in order to the break-make of control switch pipe Q1.
In LED protective device described in the utility model, described LED protective device also comprises current-limiting resistance R8, R9, R2, R7;
Electric current flow into to flow into the inverting input 2 of operational amplifier U1 from flow through current-limiting resistance R8, current-limiting resistance R9 of described LED positive source; LED power cathode contact resistance R1, current-limiting resistance R2 are to the in-phase input end 3 of operational amplifier U1; The LED positive source is connected to the in-phase input end 5 of operational amplifier U2 by current-limiting resistance R8, current-limiting resistance R7.
In LED protective device described in the utility model, described LED protective device also comprises shell, by wire, with described LED power supply, with LED lamp group conduction, is connected respectively.
The utility model compared with prior art has following advantage: LED protective device provided by the utility model; in order to access between LED power supply and LED lamp group; break-make that when electricity can control circuit appearred in circuit and without treat protection point that it reaches the LED power circuit just start-up circuit protect; protection can be provided in time; avoid causing the overheated phenomenon on fire of lighting apparatus, make whole LED circuit safer.
The accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing:
Fig. 1 is structural representation of the present utility model.
In figure: 1, LED power supply; 2, LED lamp group; 3, LED protective device; 3a, current detection component; 3B, control assembly; 3b, self-locking unlock component; 3c, driving control assembly; 3d, switch control assembly.
Embodiment
Understand for technical characterictic of the present utility model, purpose and effect being had more clearly, now contrast accompanying drawing and describe embodiment of the present utility model in detail.
The utility model discloses a kind of LED protective device; between the LED lamp group 2 that can be accessed by LED power supply 1 and be in series by some LED lamps; long or other external environment conditions are former thereby overcurrent occurs or can stop in time electric current when overheated exports and lock because of load line at LED circuit; but restore circuit after Failure elimination, thereby realize the purpose to the LED circuit protection.
This LED protective device comprises: series connection access between LED power supply 1 and LED lamp group 2 in order to detect the current detection component 3a of its electrical current; The series connection access switch control assembly 3d in order to the break-make of controlling power-on circuit between LED power supply 1 and LED lamp group 2; The control assembly 3B be connected with switch control assembly 3d with current detection component 3a respectively, the electrical current detected for current detection component 3a, come control switch control assembly 3d to control the break-make of LED lamp group 2 and LED power supply 1.Control assembly 3B comprises self-locking unlock component 3b for circuit being realized to self-locking and release and for the driving control assembly 3c of driving switch control assembly 3d.Drive control assembly 3c to be connected with switch control assembly 3d with current detection component 3a; the electrical current that received current detection components 3a detects; when electrical current exceeds the protection point of power circuit, control and drive control assembly 3c to come driving switch control assembly 3d to disconnect the power supply of LED power supply 1 and LED lamp group 2.Self-locking unlock component 3b is connected with driving control assembly 3c with current detection component 3a; the electrical current that received current detection components 3a detects; when electrical current does not exceed the protection point of power circuit, control and drive control assembly 3c to come driving switch control assembly 3d to recover the power supply of LED power supply 1 and LED lamp group 2.Switch control assembly 3d in this scheme selects metal-oxide-semiconductor, is due to its good temp characteristic, is not subject to the impact of the variations in temperature in the circuit ring border.Current detection component 3a wherein can be current sense resistance, high molecular positive temp thermistor or overcurrent identification circuit.
Understandable, this protective device 3 can comprise a shell, is arranged at wherein for electronic circuit, and is connected between LED power supply 1 and LED lamp group 2, to play the effect of overcurrent protection by wire.
When current detection component 3a is current sense resistance; in circuit, there is abnormal current to pass through or during short circuit; the voltage of current sense resistance raises; the load too high of this LED power supply is described; the electrical current that drives control assembly 3c received current detection components 3a to detect exceeds the protection point of power circuit; drive an electronegative potential of control assembly 3c output; metal-oxide-semiconductor when electronegative potential in cut-off state; disconnect the circuit between LED power supply and LED lamp group 2, thereby avoid lasting heavy current impact to cause circuit overheated and cause lighting apparatus phenomenon on fire.When fault is eliminated and electrical current when normal, the voltage of current sense resistance is normal, when the electrical current that self-locking unlock component 3b received current detection components 3a detects does not exceed the protection point of power circuit, control and drive control assembly 3c to a high potential of metal-oxide-semiconductor output, come driving switch control assembly 3d to recover the power supply of LED power supply 1 and LED lamp group 2, LED lamp group 2 is normally used; Current sense resistance is sensitive to curent change reflection in circuit, is conducive to avoid in circuit surge occurred and damaged circuit.In scheme, can also select electric identification circuit as its current detection component 3a; while selecting electric identification circuit as the current detection component 3a of this protective device; its operation principle is the same with current sense resistance, mainly utilizes current anomaly situation in electric identification circuit direct-detection circuit.
When current detection component 3a is the high molecular positive temp thermistor; the circuit running current by or circuit in each components and parts during in Normal Environmental Temperature; the high molecular positive temp thermistor is in low resistive state; when the electrical current that self-locking unlock component 3b received current detection components 3a detects does not exceed the protection point of power circuit; control and drive control assembly 3c to a high potential of metal-oxide-semiconductor output; make metal-oxide-semiconductor at high potential at present in conducting state, LED lamp group 2 normal operation.While having abnormal current or ambient temperature to raise in circuit; the heat that large electric current or environment rising produce expands rapidly this high molecular positive temp thermistor; in high-impedance state; voltage raises; the electrical current that drives control assembly 3c received current detection components 3a to detect exceeds the protection point of power circuit; drive an electronegative potential of control assembly 3c output; metal-oxide-semiconductor when electronegative potential in cut-off state; disconnect the circuit between LED power supply 1 and LED lamp group 2, thereby avoid lasting heavy current impact to cause circuit overheated and damage.After in circuit, overcurrent or the condition of high temperature are got rid of, it is normal that the high molecular positive temp thermistor recovers; High molecular positive temp thermistor volume is little, cost is low and, for variations in temperature significant reaction in environment, be conducive to avoid in circuit fire damage occurred and damaged circuit.
Fig. 2 discloses the circuit diagram of an embodiment of the utility model LED protective device.The circuit diagram of LED protective device 3 mainly comprises resistance R 1, switching tube Q1, operational amplifier U1, operational amplifier U2, diode D1, diode D2 and current-limiting resistance R8, the R9 of control circuit break-make, R2, the R7 etc. for detection of electrical current; Certainly, can also comprise some auxiliary circuit devices, as capacitor C 1-C4, resistance R 3-R6, diode D3 etc.Understandable, this LED protective device 3 can comprise a shell, and the foregoing circuit device can be arranged on a circuit board, and is arranged in this shell, then connects between LED power supply 1 and LED lamp group 2, to play the effect of overcurrent protection by wire.
Electric current flow into to flow into the inverting input 2 of operational amplifier U from flow through current-limiting resistance R8, current-limiting resistance R9 of described LED power supply 1 positive pole; LED power supply 1 negative pole contact resistance R1, current-limiting resistance R2 are to the in-phase input end 3 of operational amplifier U1; The output 1 of operational amplifier U1 connects the in-phase input end 3 of diode D2 to operational amplifier U1, in order to realize positive current feedback, to reach self-locking release purpose; The output 1 of operational amplifier U1 is by the inverting input 6 of diode D1 concatenation operation amplifier U2, LED power supply 1 positive pole is connected to the in-phase input end 5 of operational amplifier U2 by current-limiting resistance R8, current-limiting resistance R7, the output of operational amplifier U2 is electrically connected to switching tube Q1, in order to the break-make of control switch pipe Q1.
In circuit, there is abnormal current to pass through or during short circuit, resistance R 1 produces and detects voltage and access in operational amplifier U1 by current-limiting resistance R2, now flow into operational amplifier U1 inverting input 2 and in-phase input end 3 voltages are carried out to computing, by output 1 amplification detection voltage and by the inverting input 6 of diode D1 concatenation operation amplifier U2, the output 1 of operational amplifier U1 also is connected to the in-phase input end 3 of operational amplifier U1 by diode D2, realize positive current feedback, for electrical current is limited, realize auto-lock function.The amplification detection voltage that the inverting input 6 of operational amplifier U2 receives from operational amplifier U1, with the voltage that is connected the in-phase input end 5 of LED power supply 1 positive pole by resistance R 7, resistance R 8, compare, export electronegative potential by output 7 to switching tube Q1, make switching tube Q1 in cut-off state, this current branch is opened circuit, thereby avoid in circuit causing overheated even on fire and damaged circuit by continuing large electric current.When circuit recovers normal, resistance R 1 does not produce pressure drop, the output 1 of operational amplifier U1 is not to arithmetic processor U2 output amplification detection voltage, and arithmetic processor U2 drives its conducting to switching tube Q1 input high potential, recovers this current branch current path.When arithmetic processor U1 does not export amplification detection voltage, diode D2 realizes release.
The utility model describes by several specific embodiments, it will be appreciated by those skilled in the art that, in the situation that do not break away from the utility model scope, can also carry out various conversion and be equal to alternative the utility model.In addition, for particular condition or concrete condition, can make various modifications to the utility model, and not break away from scope of the present utility model.Therefore, the utility model is not limited to disclosed specific embodiment, and should comprise the whole execution modes that fall in the utility model claim scope.
Claims (3)
1. a LED protective device, for accessing between LED power supply (1) and LED lamp group (2), it is characterized in that: comprise the resistance R 1 for detection of electrical current, switching tube Q1, operational amplifier U1, operational amplifier U2, diode D1 and the diode D2 of control circuit break-make;
Electric current is from the anodal inverting input 2 that flows into operational amplifier U of described LED power supply (1), LED power supply (1) negative pole contact resistance R1 is to the in-phase input end 3 of operational amplifier U1, the output 1 of operational amplifier U1 connects the in-phase input end 3 of diode D2 to operational amplifier U1, in order to realize positive current feedback, to reach self-locking release purpose; The output 1 of operational amplifier U1 is by the inverting input 6 of diode D1 concatenation operation amplifier U2, the in-phase input end 5 of operational amplifier U2 connects LED power supply (1) positive pole, the output of operational amplifier U2 is electrically connected to switching tube Q1, in order to the break-make of control switch pipe Q1.
2. LED protective device according to claim 1, it is characterized in that: described LED protective device (3) also comprises current-limiting resistance R8, R9, R2, R7;
Electric current flow into to flow into the inverting input 2 of operational amplifier U1 from flow through current-limiting resistance R8, current-limiting resistance R9 of described LED power supply (1) positive pole; LED power supply (1) negative pole contact resistance R1, current-limiting resistance R2 are to the in-phase input end 3 of operational amplifier U1; The anodal in-phase input end 5 that is connected to operational amplifier U2 by current-limiting resistance R8, current-limiting resistance R7 of LED power supply (1).
3. according to the described LED protective device of claim 1-2 any one, it is characterized in that, described LED protective device (3) also comprises shell, by wire, with described LED power supply (1) and LED lamp group (2), is electrically connected to respectively.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204545361U CN203352914U (en) | 2013-07-29 | 2013-07-29 | LED protection device |
| PCT/CN2013/080644 WO2015013960A1 (en) | 2013-07-29 | 2013-08-01 | Led protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204545361U CN203352914U (en) | 2013-07-29 | 2013-07-29 | LED protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203352914U true CN203352914U (en) | 2013-12-18 |
Family
ID=49752757
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013204545361U Expired - Fee Related CN203352914U (en) | 2013-07-29 | 2013-07-29 | LED protection device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN203352914U (en) |
| WO (1) | WO2015013960A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107995721A (en) * | 2017-10-30 | 2018-05-04 | 厦门亚锝电子科技有限公司 | DALI adjusting control circuits |
| CN116406065A (en) * | 2023-06-06 | 2023-07-07 | 厦门普为光电科技有限公司 | Lighting device with restorable overcurrent protection function |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114224526B (en) * | 2021-12-21 | 2023-01-24 | 华中科技大学 | Tooth root canal therapy device based on atmospheric pressure low temperature plasma efflux |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102685969B (en) * | 2011-03-15 | 2015-03-11 | 登丰微电子股份有限公司 | LED (Light-Emitting Diode) drive circuit and short-circuit protection circuit |
| CN102752903B (en) * | 2011-04-22 | 2014-12-10 | 登丰微电子股份有限公司 | Light-emitting diode (LED) driving circuit and protection circuit thereof |
| JP5331154B2 (en) * | 2011-04-27 | 2013-10-30 | シャープ株式会社 | LED driving circuit and LED illumination lamp |
| CN102780205B (en) * | 2011-05-11 | 2015-01-14 | 黄华道 | Electric leakage detecting protection circuit |
| CN102801138B (en) * | 2011-05-25 | 2015-02-04 | 海洋王照明科技股份有限公司 | Light-emitting diode (LED) over current protection circuit and light fitting |
| CN102781145A (en) * | 2012-07-27 | 2012-11-14 | 贵州索立得光电科技有限公司 | LED (light emitting diode) drive power circuit |
-
2013
- 2013-07-29 CN CN2013204545361U patent/CN203352914U/en not_active Expired - Fee Related
- 2013-08-01 WO PCT/CN2013/080644 patent/WO2015013960A1/en active Application Filing
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107995721A (en) * | 2017-10-30 | 2018-05-04 | 厦门亚锝电子科技有限公司 | DALI adjusting control circuits |
| CN107995721B (en) * | 2017-10-30 | 2019-09-06 | 厦门亚锝电子科技有限公司 | DALI adjusting control circuit |
| CN116406065A (en) * | 2023-06-06 | 2023-07-07 | 厦门普为光电科技有限公司 | Lighting device with restorable overcurrent protection function |
| CN116406065B (en) * | 2023-06-06 | 2023-10-17 | 厦门普为光电科技有限公司 | Lighting device with restorable overcurrent protection function |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2015013960A1 (en) | 2015-02-05 |
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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 |
Granted publication date: 20131218 Termination date: 20150729 |
|
| EXPY | Termination of patent right or utility model |