CN204425732U - LED lamp thermal-shutdown circuit - Google Patents
LED lamp thermal-shutdown circuit Download PDFInfo
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- CN204425732U CN204425732U CN201520104206.9U CN201520104206U CN204425732U CN 204425732 U CN204425732 U CN 204425732U CN 201520104206 U CN201520104206 U CN 201520104206U CN 204425732 U CN204425732 U CN 204425732U
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- led lamp
- temperature
- pwm
- shutdown circuit
- controller
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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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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
LED lamp thermal-shutdown circuit, it comprises temperature sensor, controller and PWM maker; This temperature sensor is used for the temperature detecting LED lamp in real time, and generates corresponding temperature signal; This controller is used for this temperature signal and the temperature safety threshold value preset to compare, when temperature signal is higher than temperature safety threshold value, reduce the duty ratio of the upper PWM drive singal that PWM maker exports with preset ratio, and exported the PWM drive singal with current duty cycle by PWM maker.The utility model is when LED lamp excess temperature, and the linear power reducing LED lamp, so, the area of dissipation of LED lamp can design less than traditional, also can ensure not excess temperature, work more reliable and more stable.
Description
Technical field
The utility model relates to a kind of LED lamp thermal-shutdown circuit.
Background technology
Light of stage is one of stage design modelling means.Use light of stage equipment as lighting, magic lantern etc., along with the development of the story of a play or opera, with photochromic and change display environment, rendered atmosphere, outstanding central person, create stage spatial impression and time sense, mould the external of stage performance, and provide the lighting effects of necessity as wind, rain, cloud, water and lightning etc.
In recent years, stage lighting starts to adopt high-power LED lamp as light source, and high-power LED lamp can meet the high brightness demand of stage lighting, and the color changeable effect of LED lamp is realized by RGB three primary colors colour mixture, relative conventional light source, has without light loss and the high advantage of light utilization efficiency.But, because LED is quite responsive to variations in temperature, high-power LED lamp requires very high in heat dissipation design, normally designs cooling system according to the maximum power of LED lamp, heat radiation is realized, to make LED lamp can not excess temperature often through improvement heat spreader structures or volume; The power of LED lamp is larger, and the volume of radiator is often also comparatively large, with increasing heat radiation area, so, design less by making the volume of LED lamp be difficult to, and stage lighting also pursues small size while pursuing high brightness, existing LED lamp obviously can not meet the demand of stage lighting well.
Utility model content
For the deficiencies in the prior art, the utility model is intended to provide a kind of LED lamp thermal-shutdown circuit of solving the problems of the technologies described above and method.
For achieving the above object, the utility model adopts following technical scheme:
A kind of LED lamp thermal-shutdown circuit, it comprises temperature sensor, controller and PWM maker;
This temperature sensor is used for the temperature detecting LED lamp in real time, and generates corresponding temperature signal;
This controller is used for this temperature signal and the temperature safety threshold value preset to compare, when temperature signal is higher than temperature safety threshold value, the duty ratio of the upper PWM drive singal that PWM maker exports is reduced with preset ratio, and exported the PWM drive singal with current duty cycle by PWM maker, linearly to drag down the power of LED lamp.
Preferably, this controller is also for by PWM maker, optionally wherein two kinds of color lamp pearls of driving LED light fixture are luminous at one time.
Preferably, this temperature sensor is thermistor.
Preferably, this thermistor is installed on the lamp pearl plate of LED lamp.
The beneficial effects of the utility model are at least as follows:
The utility model is when LED lamp excess temperature, and the linear power reducing LED lamp, so, the area of dissipation of LED lamp can design less than traditional, also can ensure not excess temperature, work more reliable and more stable.
In addition, the LED lamp of the application only allows the lamp pearl of two kinds of colors luminous due to the same time, and the volume of LED lamp can be made less.
Accompanying drawing explanation
Fig. 1 is the electrical connection schematic diagram of the better embodiment of the utility model LED lamp thermal-shutdown circuit.
Fig. 2 is the circuit diagram of the LED constant current driver element of the LED lamp thermal-shutdown circuit of Fig. 1.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is described further:
Refer to Fig. 1, the utility model relates to a kind of LED lamp thermal-shutdown circuit, and its better embodiment comprises temperature sensor, controller and PWM maker.
This temperature sensor is used for the temperature detecting LED lamp in real time, and generates corresponding temperature signal.In the present embodiment, this temperature sensor is thermistor.Preferably, this thermistor is installed on the lamp pearl plate of LED lamp, to detect the temperature of near heating sources more accurately, improves temperature detection accuracy.
This controller is used for temperature signal and the temperature safety threshold value preset to compare, when temperature signal is higher than temperature safety threshold value, PWM (Pulse Width Modulation is reduced with preset ratio, pulse width modulation) duty ratio of a upper PWM drive singal that exports of maker, and exported the PWM drive singal with current duty cycle by PWM maker, linearly to drag down the power of LED lamp.
Because the power linear of LED lamp reduces, changed power ratio can be arranged in category that human eye cannot observe, as being set to 0.39%, then in the process of the temperature of dynamic adjustments LED lamp to temperature safety threshold value, can not affect the stage-lighting effect of LED lamp, so, the area of dissipation of LED lamp can design less than traditional, also can ensure not excess temperature, work more reliable and more stable.
Above-mentioned controller realizes temperature comparing function by comparator and peripheral circuit thereof, linearly changes the duty ratio of PWM drive singal by logic gates and switching tube circuit.
This controller is also for by PWM maker, optionally wherein two kinds of color lamp pearls of driving LED light fixture are luminous at one time.Owing to being intermittent work when LED lamp uses as stage lighting, and photochromic coloured silk changes with the need, LED lamp only has the lamp pearl of two kinds of colors luminous at one time, the LED lamp that then relatively traditional each lamp pearl works simultaneously, greatly can reduce power, and then reduction lamp temperatures, such as, RGBW (i.e. ruddiness, green glow, blue light and white light) in four look LED lamp, if its maximum power is 200W, in traditional heat-dissipating design, the area of dissipation of LED lamp requires at least more than 12000 square centimeters, and the LED lamp of the application only allows the lamp pearl of two kinds of colors luminous due to the same time, only need design the area of dissipation of 6000 square centimeters.So, the volume of LED lamp can be made less.
See Fig. 2, PWM maker is made up of constant-current driven chip U5, the constant-current driven chip U6 of DM413 model and its peripheral circuit, and constant-current driven chip U5 and constant-current driven chip U6 regulates the power of each color lamp pearl of RGBW tetra-look LED lamp by the switching frequency of the triode Q3 to triode Q6 that control its peripheral circuit.
For a person skilled in the art, according to technical scheme described above and design, other various corresponding change and distortion can be made, and all these change and distortion all should belong within the protection range of the utility model claim.
Claims (4)
1. a LED lamp thermal-shutdown circuit, is characterized in that: it comprises temperature sensor, controller and PWM maker;
This temperature sensor is used for the temperature detecting LED lamp in real time, and generates corresponding temperature signal;
This controller is used for this temperature signal and the temperature safety threshold value preset to compare, when temperature signal is higher than temperature safety threshold value, the duty ratio of the upper PWM drive singal that PWM maker exports is reduced with preset ratio, and exported the PWM drive singal with current duty cycle by PWM maker, linearly to reduce the power output of this LED lamp.
2. LED lamp thermal-shutdown circuit as claimed in claim 1, is characterized in that: this controller is also for by PWM maker, optionally wherein two kinds of color lamp pearls of driving LED light fixture are luminous at one time.
3. LED lamp thermal-shutdown circuit as claimed in claim 1, is characterized in that: this temperature sensor is thermistor.
4. LED lamp thermal-shutdown circuit as claimed in claim 3, is characterized in that: this thermistor is installed on the lamp pearl plate of LED lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520104206.9U CN204425732U (en) | 2015-02-11 | 2015-02-11 | LED lamp thermal-shutdown circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520104206.9U CN204425732U (en) | 2015-02-11 | 2015-02-11 | LED lamp thermal-shutdown circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204425732U true CN204425732U (en) | 2015-06-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520104206.9U Active CN204425732U (en) | 2015-02-11 | 2015-02-11 | LED lamp thermal-shutdown circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204425732U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104684216A (en) * | 2015-02-11 | 2015-06-03 | 广州市德晟照明实业有限公司 | Over-temperature protection circuit and method for LED lamp |
| CN107426866A (en) * | 2017-07-24 | 2017-12-01 | 广州市雅江光电设备有限公司 | A kind of temperature power control method for applying to LED lamp |
-
2015
- 2015-02-11 CN CN201520104206.9U patent/CN204425732U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104684216A (en) * | 2015-02-11 | 2015-06-03 | 广州市德晟照明实业有限公司 | Over-temperature protection circuit and method for LED lamp |
| CN107426866A (en) * | 2017-07-24 | 2017-12-01 | 广州市雅江光电设备有限公司 | A kind of temperature power control method for applying to LED lamp |
| CN107426866B (en) * | 2017-07-24 | 2019-12-17 | 广州市雅江光电设备有限公司 | Temperature-power control method applied to LED lamp |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |