CN105517227A - LED lamp over-temperature protection method - Google Patents
LED lamp over-temperature protection method Download PDFInfo
- Publication number
- CN105517227A CN105517227A CN201510954248.6A CN201510954248A CN105517227A CN 105517227 A CN105517227 A CN 105517227A CN 201510954248 A CN201510954248 A CN 201510954248A CN 105517227 A CN105517227 A CN 105517227A
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- CN
- China
- Prior art keywords
- temperature
- led
- control circuit
- circuit
- led lamp
- 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.)
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Classifications
-
- 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
-
- 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]
Abstract
The invention relates to an LED lamp over-temperature protection method. An over-temperature protection circuit, comprising a temperature detection circuit, a temperature control circuit and a constant current control circuit, is adopted to perform over-temperature protection. The method comprises the following steps: the temperature detection circuit detects the change of the temperature of an LED lamp, and sends a temperature detection signal to the temperature control circuit; when the temperature is too high, the temperature control circuit sends a current control signal to the constant current control circuit; and the constant current control circuit decreases the current flowing through the LED lamp to lower the temperature so as to ensure normal work of the LED lamp. The method of the invention is simple, safe and reliable. The production cost can be reduced effectively, the accuracy of the thermal protection circuit of the LED lamp can be improved, and effective protection can be offered to LED lamps.
Description
Technical field
The present invention relates to LED technology field, be specifically related to a kind of LED excess temperature protection method.
Background technology
LED is as new type light source, and it has energy-saving and environmental protection, efficiently feature, and technology is ripe and be applied to every field, and LED is widely used as lighting source.LED is a kind of current mode luminescent device; very responsive to the electric current flowing through self; require relative also very harsh, but LED is as point-source of light, its volume is very little; the heat sent during work is more concentrated; and the life cycle of temperature too high meeting serious curtailment LED, so the working life in order to ensure LED, need to add LED overtemperature protection in LED drive circuit; effectively protect when LED is overheated, prevent temperature too high and damage LED.
Current overheating protection circuit generally adopts and add chip overheating protection in LED constant current drives; indirectly reflect the working temperature of LED; it adopts integrated circuit; have circuit simple, use the advantages such as flexible; but it often can not reflect the working temperature of LED truly; so its accuracy is not high, effective overtemperature protection can not be provided for LED.
Summary of the invention
The object of the present invention is to provide a kind of accuracy high and the LED excess temperature protection method of overtemperature protection can be effectively provided.
For achieving the above object, present invention employs following technical scheme:
A kind of LED excess temperature protection method, adopt thermal-shutdown circuit to protect, described thermal-shutdown circuit comprises temperature sensing circuit, temperature-control circuit and constant-current control circuit;
The method comprises the following steps: the change being detected LED temperature by temperature sensing circuit, and this temperature detection signal is sent to temperature-control circuit, when temperature is too high, temperature-control circuit sends current controling signal to constant-current control circuit, constant-current control circuit reduces temperature by the electric current being reduced by LED, ensures the normal work of ELD lamp.
Further, in the downside of the circuit board of LED, heat-radiating substrate is installed, by heat-radiating substrate, auxiliary temperature-reducing is carried out to LED.
Further, in described temperature-control circuit, diverter switch is installed, when the temperature of LED is greater than the rated temperature range of setting, its power supply is disconnected by diverter switch, LED is closed go out, when LED returns in rated temperature range, connect power supply by diverter switch, with lightening LED lamp.
As shown from the above technical solution, LED excess temperature protection method of the present invention, safe and reliable, circuit is simple, not only effectively can reduce production cost, and this overheating protection circuit accuracy high, available protecting can be provided for LED lamp.
Accompanying drawing explanation
Fig. 1 is circuit block diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described:
As shown in Figure 1, the method described in the present embodiment, adopt thermal-shutdown circuit to protect, this thermal-shutdown circuit comprises temperature sensing circuit 1, temperature-control circuit 2 and constant-current control circuit 3;
The method of this overheat protector comprises the following steps: the change being detected LED temperature by temperature sensing circuit 1; and this temperature detection signal is sent to temperature-control circuit 2; when temperature is too high; temperature-control circuit 2 sends current controling signal to constant-current control circuit 3; constant-current control circuit 3 reduces temperature by the electric current being reduced by LED 4, ensures the normal work of ELD lamp 4.
In the downside of the circuit board of LED, heat-radiating substrate is installed, by heat-radiating substrate, auxiliary temperature-reducing is carried out to LED.
In described temperature-control circuit 2, diverter switch is installed, when the temperature of LED 4 is greater than the rated temperature range of setting, its power supply is disconnected by diverter switch, LED 4 is closed go out, when LED returns in rated temperature range, power supply is connected, with lightening LED lamp 4 by diverter switch.
Above-described embodiment is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that those of ordinary skill in the art make technical scheme of the present invention and improvement, all should fall in protection range that claims of the present invention determines.
Claims (3)
1. a LED excess temperature protection method, is characterized in that: adopt thermal-shutdown circuit to protect, described thermal-shutdown circuit comprises temperature sensing circuit, temperature-control circuit and constant-current control circuit;
The method of overheat protector comprises the following steps: the change being detected LED temperature by temperature sensing circuit; and this temperature detection signal is sent to temperature-control circuit; when temperature is too high; temperature-control circuit sends current controling signal to constant-current control circuit; constant-current control circuit reduces temperature by the electric current being reduced by LED, ensures the normal work of ELD lamp.
2. LED excess temperature protection method according to claim 1, is characterized in that: be provided with heat-radiating substrate in the downside of the circuit board of LED, carries out auxiliary temperature-reducing by heat-radiating substrate to LED.
3. LED excess temperature protection method according to claim 1; it is characterized in that: in described temperature-control circuit, diverter switch is installed; when the temperature of LED is greater than the rated temperature range of setting; its power supply is disconnected by diverter switch; LED is closed go out; when LED returns in rated temperature range, connect power supply by diverter switch, with lightening LED lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510954248.6A CN105517227A (en) | 2015-12-20 | 2015-12-20 | LED lamp over-temperature protection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510954248.6A CN105517227A (en) | 2015-12-20 | 2015-12-20 | LED lamp over-temperature protection method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105517227A true CN105517227A (en) | 2016-04-20 |
Family
ID=55724755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510954248.6A Pending CN105517227A (en) | 2015-12-20 | 2015-12-20 | LED lamp over-temperature protection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105517227A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020098201A1 (en) * | 2018-11-14 | 2020-05-22 | 深圳市崧盛电子股份有限公司 | Over-temperature protection circuit of led driving power supply |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201345764Y (en) * | 2009-01-09 | 2009-11-11 | 四川省桑瑞光辉标识系统制造有限公司 | Lighting circuit with warm intelligent protection of LED (light emitting diode) |
| US20100277077A1 (en) * | 2009-05-04 | 2010-11-04 | Man Hay Pong | Apparatus and method to enhance the life of Light Emitting diode (LED) devices in an LED matrix |
| CN103249206A (en) * | 2012-02-09 | 2013-08-14 | 上海技磐光电科技有限公司 | LED lamp |
| CN203261005U (en) * | 2013-04-22 | 2013-10-30 | 深圳创维－Rgb电子有限公司 | LED constant-current over-temperature protection circuit and LED lamp |
| CN203608439U (en) * | 2013-12-24 | 2014-05-21 | 淮阴工学院 | LED constant current power supply with over-temperature protection |
-
2015
- 2015-12-20 CN CN201510954248.6A patent/CN105517227A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201345764Y (en) * | 2009-01-09 | 2009-11-11 | 四川省桑瑞光辉标识系统制造有限公司 | Lighting circuit with warm intelligent protection of LED (light emitting diode) |
| US20100277077A1 (en) * | 2009-05-04 | 2010-11-04 | Man Hay Pong | Apparatus and method to enhance the life of Light Emitting diode (LED) devices in an LED matrix |
| CN103249206A (en) * | 2012-02-09 | 2013-08-14 | 上海技磐光电科技有限公司 | LED lamp |
| CN203261005U (en) * | 2013-04-22 | 2013-10-30 | 深圳创维－Rgb电子有限公司 | LED constant-current over-temperature protection circuit and LED lamp |
| CN203608439U (en) * | 2013-12-24 | 2014-05-21 | 淮阴工学院 | LED constant current power supply with over-temperature protection |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020098201A1 (en) * | 2018-11-14 | 2020-05-22 | 深圳市崧盛电子股份有限公司 | Over-temperature protection circuit of led driving power supply |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160420 |