CN101968174A - LED assembly for lighting - Google Patents
LED assembly for lighting Download PDFInfo
- Publication number
- CN101968174A CN101968174A CN2010105196299A CN201010519629A CN101968174A CN 101968174 A CN101968174 A CN 101968174A CN 2010105196299 A CN2010105196299 A CN 2010105196299A CN 201010519629 A CN201010519629 A CN 201010519629A CN 101968174 A CN101968174 A CN 101968174A
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- China
- Prior art keywords
- diode
- heat sink
- temperature
- led
- led chip
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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
Abstract
The invention provides a light emitting diode (LED) assembly for lighting. The LED assembly comprises a heat sink, and an LED chip and a control chip which are encapsulated on the heat sink, wherein an oscillating circuit module which comprises a capacitor is arranged in the control chip; one connection point of the capacitor is connected with the anode of a first diode, the cathode of a second diode and the anode of an inverter at the same time; the cathode of the first diode is connected with the cathode of the inverter by a first resistor; simultaneously, the anode of the second diode is also connected with the cathode of the inverter by a negative temperature coefficient thermal resistor. When the temperature of the heat sink is gradually raised along with the raising temperature of the LED chip, a current duty ratio is gradually reduced, and the average working current is also reduced to ensure that the temperature of the LED chip is reduced till the temperature value and the current value reach a dynamic balance, thus the using safety of the LED chip is improved, and the service life of the LED chip is greatly prolonged.
Description
Technical field
The present invention relates to a kind of LED assembly, especially a kind of illuminating LED assembly of controlling the LED temperature.
Background technology
Illuminating high-capacity LED (Light Emitting Diode, light emitting diode) is a kind of new type light source, compares it with conventional light source and has lot of advantages: long-lived, energy-conservation, low-voltage, volume are little, pollution-free.Illuminating high-capacity LED total light flux height, but operating current is big, and caloric value is also big.
The physical characteristic of diode is followed in illumination with high-capacity LED: (1) LED has a cut-in voltage, surpassing cut-in voltage just will start working, in the operate as normal interval, voltage is high more, electric current is big more, but the two is non-linear proportional relationship also, and in the operate as normal interval, less voltage raises and will cause that bigger electric current raises; (2) work under the equal electric current, the LED junction temperature is high more, and voltage is just low more.If LED adopts the constant voltage power supply, LED starts the back junction temperature and will constantly raise, the operating voltage of LED just has a declining tendency, and because the supply voltage that constant pressure source provides is constant, therefore actual effect is that operating current becomes greatly, and bigger operating current produces bigger heat, cause junction temperature to raise once more, thereby form the relation of a direct circulation, before the balance of current/voltage and junction temperature forms, real work power may surpass the safe handling scope, and so high power can produce a large amount of heats, and finally causes LED damage or life-span to shorten greatly.
Therefore, need a kind of new technical scheme to address the above problem.
Summary of the invention
The objective of the invention is deficiency, a kind of illuminating LED assembly that prevents that the led chip temperature is too high is provided at the prior art existence.
For achieving the above object, illuminating LED assembly of the present invention can adopt following technical scheme:
A kind of illuminating LED assembly, it comprise heat sink, be packaged in the led chip on heat sink and be packaged in control chip on heat sink equally, has the oscillating circuit module in the described control chip, this oscillating circuit module comprises electric capacity, one tie point of this electric capacity is connected with the positive pole of first diode, the negative pole of second diode and the positive pole of phase inverter simultaneously, the negative pole of described first diode is connected with the negative pole of phase inverter by first resistance, and the positive pole of second diode also is connected with the negative pole of phase inverter by negative tempperature coefficient thermistor simultaneously.
Compare with background technology, illuminating LED assembly of the present invention is the characteristic of inverse ratio by negative tempperature coefficient thermistor resistance and temperature in the oscillating circuit module, make the control chip that is encapsulated on heat sink can the heat sink temperature of perception, when heat sink temperature is low, the electric current dutycycle is big, average operating current height, this moment, led chip can heat up; And when heat sink temperature progressively raise with the temperature rising of led chip, the electric current dutycycle progressively diminished, and average operating current also diminishes, thereby makes the led chip cooling, reaches a dynamic equilibrium until temperature value and current value.The operating current of this led chip just is closely connected with the operating temperature of led chip and is in the same place like this, thereby has avoided high temperature to cause the damage of led chip, has improved the safety in utilization of led chip, and the service life of improving led chip greatly.
Description of drawings
Fig. 1 is the vertical view of illuminating LED assembly of the present invention.
Fig. 2 be among Fig. 1 illuminating LED assembly of the present invention along the cutaway view of A-A direction.
Fig. 3 is the circuit diagram of control chip in the illuminating LED assembly of the present invention.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the present invention, should understand these embodiment only is used to the present invention is described and is not used in and limit the scope of the invention, after having read the present invention, those skilled in the art all fall within the application's claims institute restricted portion to the modification of the various equivalent form of values of the present invention.
See also Figure 1 and Figure 2, the invention discloses a kind of illuminating LED assembly 100, this illuminating LED assembly 100 comprises base 20, be installed on lens 30 on the base 20, be arranged in space that base 20 and lens 30 surround heat sink 40, be packaged in the led chip 50 on heat sink 40 and be packaged in control chip 60 on heat sink 40 equally, and a pair of electrode 70 that extends base 20.Described heat sink 40 can absorb the heat of led chip 50 and make control chip 60 be subjected to the influence of this heat equally.
See also shown in Figure 3ly, be the circuit diagram in the described control chip 60.Has oscillating circuit module 61 in the described control chip 60, this oscillating circuit module 61 comprises capacitor C 1, one tie point of this capacitor C 1 is connected with the positive pole of the first diode D4, the negative pole of the second diode D5 and the positive pole of phase inverter CD40106B simultaneously, the negative pole of the described first diode D4 is connected with the negative pole of phase inverter CD40106B by first resistance R 3, and the positive pole of the second diode D5 also is connected with the negative pole of phase inverter CD40106B by negative tempperature coefficient thermistor NTC simultaneously.By this oscillating circuit module 61, can obtain following effect:
(1) when CD40106B output pin2 is 0, capacitor C 1 discharge, when the C1 terminal voltage is worth less than certain (V01), the phase inverter upset becomes high level;
(2) and when CD40106B output pin2 was 1, capacitor C 1 was recharged, when the C1 terminal voltage is worth greater than certain (V02), the phase inverter upset becomes low level.
Whole oscillatory process is exactly constantly to repeat the process of above-mentioned (1), (2).
Because first resistance R 3 is fixing, so capacitor C is fixed for 1 discharge time, promptly low level width is fixed;
Diminish because negative tempperature coefficient thermistor NTC value raises with temperature, temperature reduces and becomes big.When temperature raise, negative tempperature coefficient thermistor NTC resistance diminished, and accelerated by this negative tempperature coefficient thermistor NTC charging, promptly export the high level width and diminish, otherwise output high level width becomes big, thereby reach the purpose of control load average current.
In sum, be encapsulated in the temperature that control chip 60 on heat sink 40 can perception heat sink 40, when the temperature when heat sink 40 was low, the electric current dutycycle was big, average operating current height, and this moment, led chip 50 can heat up; And raise with the temperature of led chip 50 and when progressively raising, the electric current dutycycle progressively diminishes when heat sink 40 temperature, average operating current also diminishes, thereby makes led chip 50 coolings, reaches a dynamic equilibrium until temperature value and current value.The operating current of this led chip 50 just is closely connected with the operating temperature of led chip 50 and is in the same place like this, thereby has avoided high temperature to cause the damage of led chip 50, has improved the safety in utilization of led chip 50, and the service life of improving led chip 50 greatly.
Claims (2)
1. illuminating LED assembly, it is characterized in that: it comprises heat sink, be packaged in the led chip on heat sink and be packaged in control chip on heat sink equally, has oscillating circuit module (61) in the described control chip, this oscillating circuit module (61) comprises electric capacity (C1), one tie point while of this electric capacity (C1) and the positive pole of first diode (D4), the positive pole of the negative pole of second diode (D5) and phase inverter (CD40106B) connects, the negative pole of described first diode (D4) is connected with the negative pole of phase inverter (CD40106B) by first resistance (R3), and the positive pole of second diode (D5) also is connected with the negative pole of phase inverter (CD40106B) by negative tempperature coefficient thermistor (NTC) simultaneously.
2. illuminating LED assembly according to claim 1 is characterized in that: described LED assembly also is provided with base and is installed on lens on the base, the described heat sink space that base and lens surround that is arranged in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105196299A CN101968174A (en) | 2010-10-26 | 2010-10-26 | LED assembly for lighting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105196299A CN101968174A (en) | 2010-10-26 | 2010-10-26 | LED assembly for lighting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101968174A true CN101968174A (en) | 2011-02-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105196299A Pending CN101968174A (en) | 2010-10-26 | 2010-10-26 | LED assembly for lighting |
Country Status (1)
| Country | Link |
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| CN (1) | CN101968174A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101442854A (en) * | 2007-11-23 | 2009-05-27 | 鹏智科技(深圳)有限公司 | LED control device |
| CN201294659Y (en) * | 2008-10-07 | 2009-08-19 | 矽恩微电子(厦门)有限公司 | High-power LED driven circuit for compensating universal temperature |
| CN201377719Y (en) * | 2009-04-16 | 2010-01-06 | 易安基自动化设备(北京)有限公司 | Pint light source of high-frequency light source emitter with adjustable frequency |
| CN201571238U (en) * | 2009-12-28 | 2010-09-01 | 重庆三弓科技发展有限公司 | LED constant current switch power circuit |
-
2010
- 2010-10-26 CN CN2010105196299A patent/CN101968174A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101442854A (en) * | 2007-11-23 | 2009-05-27 | 鹏智科技(深圳)有限公司 | LED control device |
| CN201294659Y (en) * | 2008-10-07 | 2009-08-19 | 矽恩微电子(厦门)有限公司 | High-power LED driven circuit for compensating universal temperature |
| CN201377719Y (en) * | 2009-04-16 | 2010-01-06 | 易安基自动化设备(北京)有限公司 | Pint light source of high-frequency light source emitter with adjustable frequency |
| CN201571238U (en) * | 2009-12-28 | 2010-09-01 | 重庆三弓科技发展有限公司 | LED constant current switch power circuit |
Non-Patent Citations (1)
| Title |
|---|
| 《模拟电子技术基础》 20010630 童诗白等 占空比可调电路 高等教育出版社 423-424 1-2 , 第三版 1 * |
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Application publication date: 20110209 |