CN105578651A - Temperature protection circuit for LED work lamp - Google Patents
Temperature protection circuit for LED work lamp Download PDFInfo
- Publication number
- CN105578651A CN105578651A CN201610031726.0A CN201610031726A CN105578651A CN 105578651 A CN105578651 A CN 105578651A CN 201610031726 A CN201610031726 A CN 201610031726A CN 105578651 A CN105578651 A CN 105578651A
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- China
- Prior art keywords
- temperature
- work light
- led work
- protection circuit
- threshold temperature
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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]
- H05B45/10—Controlling the intensity of the light
-
- 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]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention relates to a protection circuit for an LED lamp, and specifically to a temperature protection circuit for an LED work lamp. The LED work lamp is arranged on a light source panel; the temperature protection circuit comprises a power supply, a voltage conversion module connected with the power supply and the LED work lamp separately and used for driving the LED work lamp to work by the power supply, and a control module connected with the voltage conversion module, wherein the control module comprises a temperature sampling unit used for collecting the real-time temperature of the light source panel; and the control module controls the electric energy output by the voltage conversion module according to the real-time temperature so as to adjust the working states of the LED work lamp. When the temperature of the LED light source panel is overhigh, the input voltage of the work lamp is lowered through the voltage conversion module to lower the electric energy of the work lamp, so that continuous illumination of the work lamp is ensured, and the environment temperature of the work lamp is lowered as well.
Description
Technical field
The present invention relates to a kind of protective circuit of LED, particularly relate to a kind of temperature protection circuit of LED.
Background technology
LED work light, because of the feature that its volume is little, brightness is high, power consumption is low, is widely used in the working sites such as various Large Construction operation, accident maintenance, rescue and relief work, becomes the light fixture of requisite illumination.But meanwhile, because work light power is large, brightness is high, the operating time is of a specified duration can cause light fitting body to become a thermal source.When LED work light is under high temperature for a long time, very large injury can be caused to LED work light, have a strong impact on the life-span of LED work light, also cause the light decay of LED work light.
The scheme of general temperature protection design circuit design, being all when detecting that LED light source plate temperature is too high, closing the drive circuit of LED work light, allowing LED work light quit work, thus effectively protect operating circuit and light fixture, avoid causing fault.But LED work light is an on-the-spot lighting, when being in an emergency, when such as accident maintenance or rescue and relief work, work light can not be closed easily.Therefore, in such cases, protect light fixture by the operating circuit of temporary close LED, not there is feasibility, also not there is stability.
Summary of the invention
For the problems referred to above that current LED work light exists, the invention provides a kind of temperature protection circuit of LED.
The technical scheme that technical solution problem of the present invention adopts is:
A kind of LED work light temperature protection circuit, described LED work light is arranged on light source board, and described temperature protection circuit comprises:
Power supply;
Voltage transformation module, is connected with described power supply and described LED work light respectively, to utilize LED work light work described in described power drives;
Control module, is connected with described voltage transformation module;
Wherein, described control module comprises temperature sampling unit, and in order to gather the real time temperature of described light source board, and described control module controls the electric energy of described voltage transformation module output, to adjust the operating state of described LED work light according to described real time temperature.
Preferably, in described control module, be preset with first threshold temperature and Second Threshold temperature, and described Second Threshold temperature is higher than described first threshold temperature; And
When described real time temperature is higher than described first threshold temperature and lower than Second Threshold temperature, described control module controls described voltage transformation module and reduces the electric energy inputted to described LED work light, to reduce the operating current of LED work light.
Preferably, described control module also comprises the timing unit connecting described voltage transformation module, for presetting a setting-up time, and carries out countdown to described setting-up time; And when described real time temperature is greater than or equal to Second Threshold temperature, and when the duration exceedes described setting-up time, described LED work light does not work.
Preferably, when described real time temperature is less than or equal to described first threshold temperature, described control module controls described voltage transformation module and drives described LED work light normally to work.
Preferably, described control module is also preset with and is greater than described first threshold temperature and the 3rd threshold temperature being less than described Second Threshold temperature; And
When described real time temperature is between described first threshold temperature and the 3rd threshold temperature, the operating current of described real time temperature and described LED work light is First Line sexual intercourse, and its slope is K1; When described real time temperature is between described 3rd threshold temperature and Second Threshold temperature, the operating current of described real time temperature and described LED work light is the second linear relationship, and its slope is K2, wherein, K1, K2 are negative, and | K1|>|K2|.
Preferably, described first threshold temperature is 95 °, and Second Threshold temperature is 120 °, and the 3rd threshold temperature is 105 °.
Preferably, also comprise detection module, be connected with described control module, and this detection module closes on the setting of described light source board, for the real time temperature detecting this light source board.
Preferably, described control module also comprises the pwm unit be connected with described voltage transformation module, regulates the electric energy that described voltage transformation module exports.
Preferably, described control module also comprises the fault location test unit connecting described voltage transformation module, for detecting the fault message of described voltage transformation module, and described fault message is fed back to described fault location test unit.
Preferably, described power acquisition solar panel.
Beneficial effect of the present invention: the operating ambient temperature of this programme to high power work lamp detects, when LED light source plate temperature is too high time, the input voltage of work light is reduced by control circuit and voltage conversion circuit, reduce the operating current of work light, thus when both ensureing that work light continues illumination, again reduce the ambient temperature of work light simultaneously, ensure that quality and the life-span of work light.Only have when ambient temperature continues to reach a very high threshold value, continue for a period of time simultaneously, just can close the circuit of work light, avoid operating circuit to be burned, there is higher feasibility and stability.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the graph of a relation between the real time temperature of LED light source plate of the present invention and the operating current of LED work light.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described, but not as limiting to the invention.
As shown in Figure 1, a kind of LED temperature protection circuit, comprising the detection module 1 closing on LED light source plate and arrange, for detecting the real time temperature of LED work light light source board in real time, and the real time temperature detected being sent to control module 2.This detection module 1 obtains temperature information by the temperature sensor of its inside.Control module 2 is single-chip microcomputer (MCU), and MCU inside carries temperature sampling unit, so also can by the real time temperature of this temperature sampling unit inspection light source board.Whole temperature protection circuit also comprises the power supply 5 connecting MCU, for MCU provides stable input voltage.When LED work light works out of doors, can also be that MCU powers by solar panel, energy savings.Between MCU and LED work light 4, arrange a voltage transformation module 3, this voltage transformation module 3 is the dc-dc of buck-boost type, and voltage transformation module 3 connects LED work light 4, for LED work light 4 provides transformable electric current.In addition, the pwm unit be connected with voltage transformation module 3 in control module 2, is provided with, the electric energy that regulation voltage modular converter 3 exports.Also having the fault location test unit connecting voltage transformation module 3 in control module 2, for detecting the fault message of voltage transformation module 3, and fault message being fed back to fault location test unit.
LED work light power is large, and brightness is high, is applicable to therefore rushes to repair or the special occasions such as rescue and relief work.But the high-power LED work light operating time is more of a specified duration, the working temperature of its light source board is higher, easily burns out circuit.In the present embodiment, these four parameters of preset first threshold value temperature, Second Threshold temperature, the 3rd threshold temperature and setting-up time in control module 2, and first threshold temperature is less than the 3rd threshold temperature, 3rd threshold temperature is less than Second Threshold temperature, and the value setting these four parameters is respectively 95 ° (i.e. first threshold temperature), 120 ° (i.e. Second Threshold temperature), 105 ° (i.e. the 3rd threshold temperature), 3 minutes (i.e. setting-up time).When real time temperature is less than or equal to 95 °, whole circuit normally works, and namely keeps original state constant, and now LED work light 4 operating current is rated operational current.
When real time temperature is greater than first threshold temperature 95 ° and is less than Second Threshold temperature 120 °, the electric energy that control module 2 control voltage modular converter 3 exports, reduce the operating current of LED work light 4 according to certain parameter ratio, the relation of concrete real time temperature and operating current is see Fig. 2.Wherein, control module 2 is worked by the mode driving voltage modular converter 3 of pulse width modulation.When real time temperature is between 95 ° and 105 °, the electric energy that control module 2 control voltage modular converter 3 exports, make the operating current of LED work light 4 between 100% and 70% of its rated operational current, now real time temperature and operating current are First Line sexual intercourse, and its slope is K1.When real time temperature is between 105 ° and 120 °, the electric energy that control module 2 control voltage modular converter 3 exports, make the operating current of LED work light 4 between 70% and 55% of rated operational current, now real time temperature and operating current are the second linear relationship, and its slope is K2; Wherein, K1, K2 are negative, and | K1|>|K2|.
If LED work light continues to work long hours, the real time temperature of LED light source plate likely exceedes second temperature threshold 120 ° of setting.Because reduce real time temperature need the regular hour by the operating current that reduce LED work light 4, and when real time temperature is more than 120 °, LED work light 4 works on and may burn out inner working line, even has influence on the miscellaneous equipment be connected with LED work light 4.Therefore, when more than 120 ° and the duration exceed time of setting, MCU control module 2 powers no longer to LED work light 4, allows its power-off quit work.The timing unit connected in the control module 2 of voltage transformation module 3 can preset a setting-up time, and carries out countdown to the time of setting, usually, setting-up time is set to 3 minutes.
When LED light source plate temperature is too high time, the input electric energy of work light is reduced by control module 2 and voltage transformation module 3, thus when both ensureing that LED work light continues illumination, again reducing the real time temperature of work light simultaneously, ensure that quality and the life-span of work light.Only have when real time temperature continues to reach a very high threshold value, continue for a period of time simultaneously, just can close the circuit of work light, avoid operating circuit to be burned, there is higher feasibility and stability.
The foregoing is only preferred embodiment of the present invention; not thereby embodiments of the present invention and protection range is limited; to those skilled in the art; the equivalent replacement that all utilizations specification of the present invention and diagramatic content are made and the scheme that apparent change obtains should be recognized, all should be included in protection scope of the present invention.
Claims (10)
1. a LED work light temperature protection circuit, is characterized in that, described LED work light is arranged on light source board, and described temperature protection circuit comprises:
Power supply;
Voltage transformation module, is connected with described power supply and described LED work light respectively, to utilize LED work light work described in described power drives;
Control module, is connected with described voltage transformation module;
Wherein, described control module comprises temperature sampling unit, and in order to gather the real time temperature of described light source board, and described control module controls the electric energy of described voltage transformation module output, to adjust the operating state of described LED work light according to described real time temperature.
2. LED work light temperature protection circuit according to claim 1, is characterized in that, is preset with first threshold temperature and Second Threshold temperature in described control module, and described Second Threshold temperature is higher than described first threshold temperature; And
When described real time temperature is higher than described first threshold temperature and lower than Second Threshold temperature, described control module controls described voltage transformation module and reduces the electric energy inputted to described LED work light, to reduce the operating current of LED work light.
3. LED work light temperature protection circuit according to claim 2, is characterized in that, described control module also comprises the timing unit connecting described voltage transformation module, for presetting a setting-up time, and carries out countdown to described setting-up time; And
When described real time temperature is greater than or equal to Second Threshold temperature, and when the duration exceedes described setting-up time, described LED work light does not work.
4. LED work light temperature protection circuit according to claim 2, is characterized in that, when described real time temperature is less than or equal to described first threshold temperature, described control module controls described voltage transformation module and drives described LED work light normally to work.
5. LED work light temperature protection circuit according to claim 2, is characterized in that, described control module is also preset with and is greater than described first threshold temperature and the 3rd threshold temperature being less than described Second Threshold temperature; And
When described real time temperature is between described first threshold temperature and the 3rd threshold temperature, the operating current of described real time temperature and described LED work light is First Line sexual intercourse, and its slope is K1; When described real time temperature is between described 3rd threshold temperature and Second Threshold temperature, the operating current of described real time temperature and described LED work light is the second linear relationship, and its slope is K2;
Wherein, K1, K2 are negative, and | K1|>|K2|.
6. LED work light temperature protection circuit according to claim 5, is characterized in that, described first threshold temperature is 95 °, and Second Threshold temperature is 120 °, and the 3rd threshold temperature is 105 °.
7. LED work light temperature protection circuit according to claim 1, is characterized in that, also comprise:
Detection module, is connected with described control module, and described detection module closes on the setting of described light source board, for the real time temperature detecting this light source board.
8. LED work light temperature protection circuit according to claim 1, is characterized in that, described control module also comprises the pwm unit be connected with described voltage transformation module, regulates the electric energy that described voltage transformation module exports.
9. LED work light temperature protection circuit according to claim 1; it is characterized in that; described control module also comprises the fault location test unit connecting described voltage transformation module; for detecting the fault message of described voltage transformation module, and described fault message is fed back to described fault location test unit.
10. LED work light temperature protection circuit according to claim 1, is characterized in that, described power acquisition solar panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610031726.0A CN105578651A (en) | 2016-01-18 | 2016-01-18 | Temperature protection circuit for LED work lamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610031726.0A CN105578651A (en) | 2016-01-18 | 2016-01-18 | Temperature protection circuit for LED work lamp |
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| CN105578651A true CN105578651A (en) | 2016-05-11 |
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| CN201610031726.0A Pending CN105578651A (en) | 2016-01-18 | 2016-01-18 | Temperature protection circuit for LED work lamp |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107734748A (en) * | 2017-10-26 | 2018-02-23 | 芜湖市纯至网络科技有限公司 | A kind of brightness intelligent adjusting method of household lamp |
| CN108633128A (en) * | 2018-02-09 | 2018-10-09 | 常州星宇车灯股份有限公司 | A kind of the overheat protector control circuit and its control method of LED car lamp |
| CN109196951A (en) * | 2016-06-10 | 2019-01-11 | 伊顿智能动力有限公司 | The electric current of light emitting diode lighting equipment is adjusted back |
| CN110139433A (en) * | 2019-05-21 | 2019-08-16 | 上海博灿机器人科技有限公司 | It illuminates fire-fighting robot drop volume and controls lighting device |
| CN110324939A (en) * | 2019-07-24 | 2019-10-11 | 广东德洛斯照明工业有限公司 | A kind of system and method for preventing lamps and lanterns from continuously flashing |
| CN114269395A (en) * | 2019-06-14 | 2022-04-01 | 路美康尔私人有限公司 | Ultrasonic transducer disinfection method and device capable of monitoring heat and electronic equipment |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109196951A (en) * | 2016-06-10 | 2019-01-11 | 伊顿智能动力有限公司 | The electric current of light emitting diode lighting equipment is adjusted back |
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| CN108633128A (en) * | 2018-02-09 | 2018-10-09 | 常州星宇车灯股份有限公司 | A kind of the overheat protector control circuit and its control method of LED car lamp |
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| CN114269395A (en) * | 2019-06-14 | 2022-04-01 | 路美康尔私人有限公司 | Ultrasonic transducer disinfection method and device capable of monitoring heat and electronic equipment |
| CN110324939A (en) * | 2019-07-24 | 2019-10-11 | 广东德洛斯照明工业有限公司 | A kind of system and method for preventing lamps and lanterns from continuously flashing |
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Application publication date: 20160511 |