TW200928217A - Illumination device - Google Patents

Abstract

The present invention relates to an illumination device. The illumination device includes at least one light source, a thermoelectric cooler, a heat-dissipating device and a detection and control member. The thermoelectric cooler includes a cool end and a hot end. The hot end of the thermoelectric cooler is thermally connected to the at least one light source. The heat-dissipating device is thermally connected to the hot end of the thermoelectric cooler. The detection and control member includes a detection member and a control member. The detection member is thermally connected to the at least one light source for detecting and calculating a temperature of the at least one light source and sending a corresponding detecting signal to the control member. The control member receives the detecting signal to control and adjust a working current or a working voltage of the thermoelectric cooler according to the detecting signal.

Description

200928217 IX. Description of the Invention: [Technical Field] The present invention relates to a lighting device, and more particularly to a lighting device which can achieve better heat dissipation efficiency. [Prior Art] At present, the Light Emitting Diode (LED) is gradually replacing the Cold Cathode Fluorescent Lamp (CCFL) due to its high light quality and high luminous efficiency. The "component" can be found in "Solid-State Lighting: Toward Superior Illumination" by Michael S. Shur et al., Proceedings of the IEEE, Vol. 93, No. 10 (October 1005). The stability of the light-emitting diode during use is susceptible to ambient temperature. For example, when the temperature is too high, the luminous intensity of the light-emitting diode is easily attenuated, resulting in a shortened service life. In view of this, it is necessary to provide a lighting device a that can achieve better heat dissipation efficiency. SUMMARY OF THE INVENTION A lighting device having better heat dissipation efficiency will be described below by way of example. A lighting device comprising at least one light source; an electrothermal refrigerator comprising a cold end and a hot end 'the cold end of the electrothermal cooler is in thermal connection with the at least one light source; a heat sink, and the The hot end of the electrothermal cooler forms a thermal connection; a sensing control unit includes a sensing unit and a control unit 'the sensing unit is thermally connected to the at least one light source for sensing the temperature of the at least one light source in 200928217 And outputting a corresponding sensing signal to the control unit. The control unit receives the sensing signal and controls the operating current or voltage of the electrothermal cooler according to the sensing signal. A temperature control method using the above lighting device, comprising the steps of: sensing a temperature of at least one light source and outputting a corresponding sensing signal to the control unit; the control unit receiving the sensing signal and according to the The sensing signal sets the operating current or voltage of the electrothermal cooler. The illumination device and the temperature control method using the same according to the prior art, wherein the at least one light source is dissipated by providing an electrothermal refrigerator and a heat sink, and sensing the at least one light source by using a sensing control unit The pulse 'to adjust the operating current or voltage of the electrothermal cooler to stabilize the temperature of the at least one light source, thereby improving the working efficiency of the lighting device and prolonging its own service life. [Embodiment] Hereinafter, embodiments of the present invention will be further described in detail with reference to the drawings. Referring to FIG. 1 , a lighting device 1 with a preferred heat dissipation rate according to a first embodiment of the present invention includes at least one light source η, a thermoelectric cooler (thermoelectric cooler) 13 , and a heat sink. 15, and a sensing control unit 17. The at least one light source 11 can be at least one solid state light source, such as a light emitting diode or the like. The number of the at least one light source 11 may be plural, such as a plurality of light emitting diodes, and the plurality of light emitting diodes may be white light emitting diodes or color light emitting diodes, such as red, green, and blue light emitting diodes. Polar body, etc. In addition, the at least one 2009 200928217 light source 11 can be mounted on a circuit board 12 so that the circuit board 12 can be thermally connected to the electrothermal cooler 13. The circuit board 12 may preferably be a ceramic circuit board. Of course, it may also be a fiberglass circuit board or other circuit board made of a south heat conductive material. The electrothermal cooler 13 is configured to carry heat from the at least one light source 11 to the heat sink 15 for heat dissipation. Specifically, the electrothermal cooler 13 includes a cold end 131, a hot end 132 opposite to the cold end 131, and an N-type semiconductor 133, P 连接 type connected between the cold end 131 and the hot end 132. Semiconductor 134. In order to uniformly spread the heat concentrated in a portion of the cold end 131 and the hot end 132 of the electrothermal cooler 13, the cold end 131 and the hot end 132 are respectively covered with a first ceramic substrate 1310 and a second ceramic. The first ceramic substrate 1310 is located between the cold end 131 and the at least one light source 11 and is attached to the circuit board 12 . The second ceramic substrate 1320 is located between the hot end 132 and the heat sink 15 . . The first ceramic substrate 1310 and the second ceramic substrate 1320 have better thermal conductivity, so that the at least one light source 11 can obtain a better heat conduction effect. In addition, the first ceramic substrate 1310 and the second ceramic substrate 1320 have better insulation properties, and the electrothermal cooler 13 can maintain good electrical insulation with at least one of the light source 11 and the heat sink 15. The heat sink 15 includes a base 151 and a plurality of heat dissipation fins 152 disposed on the base 151. The base 151 is disposed on the second ceramic substrate 1320 so as to be coupled to the hot end of the electrothermal cooler 13 132 forms a thermal connection. The sensing control unit 17 includes a sensing unit 171 and a control unit 172. The control unit 172 is electrically connected to the sensing unit 171 and the electrothermal cooling 200928217, respectively. The sensing unit 171 is attached to the circuit board, and may be specifically configured as a temperature sensor or a thermocouple to sense the temperature of the at least one light source 11. In operation, the electrothermal cooler 13 is powered by an external power source 19, wherein the N-type semiconductor 133 is connected to the anode of the external power source 19, and the p-type semiconductor 134 is connected to the cathode of the external power source 19. When energized, the negatively charged electrons of the N-type semiconductor ^3 move toward the anode of the external power source 19, and the positively charged holes in the p-type semiconductor 134 move toward the cathode of the external power source 19, thereby the 'cold end 131 The heat will be transferred to the hot end 132 as the electrons and the holes move, so that the heat generated by the at least one light source η is forcibly transferred to the hot end 132 via the cold end m of the electric appliance 13, and the heat transfer device 15 is further advanced. The heat sink 152 is radiated to the outside by the heat sink 152. It can be understood that the heat sink 15 can also be a heat sink fan, which is provided by another external power source and provided by the other external power source. </ RTI> </ RTI> and the first embodiment of the present invention provides a degree control method according to the first embodiment of the present invention. The temperature control method includes the following steps: ..., month device 11 The temperature is output and (1) the sensing unit 171 senses the sensing signal corresponding to the at least one light source to the control unit 172. It is understood that at least one light source u is disposed on the circuit board 12 200928217 : and the temperature of the at least one light source 11 is obtained by a calculation method. = j early 172 receives the sensing signal and cools the temperature of the at least one light source 11 according to the sensing signal. As shown in Fig. 2, "户., 匕^ ^ ', 'When at least one light source 11 is turned on and working, the control unit 17? H β &gt; can be used to control the electrothermal cooling. The work of the device 13 is the first work ceremony - r 衩 ' understandable, at least one of the light sources 11 has a temperature ❺ _ eight t heat is also small, so that it is concentrated in at least one light source 11 and the heat of the circuit board To be less, the sensed unit 171 senses that the temperature value is lower. Corresponding to the first mode of operation, the control unit S 172 controls the operating current or voltage value of the electrothermal refrigeration to be the first working current or voltage value. The electrothermal cooler 13 at the operating current or voltage value has a certain heat dissipation effect on at least one of the light sources 11. ❹大=At least one light source u is turned on longer, or the outside temperature rises and accumulates on at least one light source u and the circuit board 12, and the heat of at least one light source 11 sensed by the field sensing unit 171 is gradually changed. When the value is greater than or equal to the reference solitude value τ, the control unit 172 controls the electrothermal cooling: the jade mode of the 13 is the second mode, so that the operating current or voltage value of the electrothermal cooler is the second wei. Making a current or voltage value, and the second operating voltage or voltage value is greater than the first operating current or voltage value. It can be understood that for the electrothermal refrigerator 13 operating under the first working current or voltage value, the electrothermal cooler 13 at the second current or voltage value is at least - "the heat dissipation effect of the source 11 will be More significantly, it can reduce the heat accumulated on at least 200928217 11 and the circuit board 12, so that the temperature value sensed by the sensing unit A m becomes low. When the sensing unit 171 senses that the temperature value is less than the degree value T , the control unit 1724 controls the electrothermal refrigerator 13:

Or the voltage value is the first operating current or voltage value. The electric cymbal, L/illumination device 1G has good dispersion and thermal performance, and can stably control the illuminating characteristics of at least one light source 11. The specific value of the reference temperature value T can be selected according to the actual situation, and the port 2 can keep at least the light source at the normal working temperature, and then the reference temperature value τ should not be set too high, preferably When the temperature of the circuit board 12 measured by the sensing = m5 is less than or equal to 120 degrees Celsius, the reference temperature value calculated from the temperature of the circuit board 12 is actually required. The illumination farm 10 provided by the embodiment of the present invention and the temperature control method using the illumination device 10 are provided with a heat sink by means of a heat sink, and a heat source 11 is used for heat dissipation. And using the sensing control unit 17 to sense the temperature of the at least-light source U to adjust the temperature of the at least-light source U by adjusting the electric heating device: current or voltage ', (4) device 1G The efficiency of the ^ also extends its own requirements. The invention has indeed met the requirements of the invention patent, and is legally based on the law. However, the above is only the preferred embodiment of the present invention. The equivalent modifications or variations made by the spirit of the present invention should be included in the scope of the following patent application. 11 200928217 [Simplified description of the drawings] Fig. 1 is a schematic structural view of a lighting device according to a first embodiment of the present invention. Fig. 2 is a flow chart showing the flow control method of the second embodiment of the present invention. [Main component symbol description] Illumination device 10 At least one light source 11 Circuit board 12 Electrothermal refrigerator 13 Heat sink 15 Sensing control unit 17 External power supply 19 Cold end 131 Hot end 132 N-type semiconductor 133 P-type semiconductor 134 Base 151 Heat dissipation Fin 152 sensing unit 171 control unit 172 first ceramic substrate 1310 second ceramic substrate 1320 12

Claims (1)

200928217 X. Patent application scope: 1. A lighting device comprising: at least one light source; a crucible electric cooler comprising a cold end and a hot end, wherein the cold of the electrothermal cooler forms heat with the at least one light source a heat dissipating device that is in thermal connection with the hot end of the electrothermal refrigerator. First, the control unit 'it includes a sensing unit and a control unit, and the sensing unit is thermally connected to the at least one light source, And sensing a temperature of the at least one light source and outputting a corresponding sensing signal to the control unit, the control unit receiving the sensing signal and controlling an operating current or voltage of the electric heating device according to the sensing signal. The lighting device of claim i, wherein the lighting device further comprises a circuit board, the at least one light source is disposed on the circuit board, and the circuit board and the electric heating refrigerator The cold end forms a thermal connection. 3. The illuminating device of claim 2, wherein the sensing unit τ is a temperature sensor or a thermocouple disposed on the circuit board. 4. The illuminating device of claim 1, wherein the heat dissipating device comprises a pedestal and a plurality of heat dissipating fins disposed on the pedestal, the heat dissipating device is hunted by the pedestal and the electric heating The hot end of the cooler forms a thermal connection. 5. The illuminating device of claim 1, wherein the heat dissipating device is a cooling fan. 6. The illumination device of claim 1, wherein the at least one light source is at least one light emitting diode light source. The method of controlling the temperature of the lighting device according to claim 1, comprising the following steps: 1 sensing unit sensing at least the temperature of the light source and outputting a corresponding sensing signal to the control unit; h, the unit receives the sensing signal and sets an operating current or voltage of the electrothermal cooler according to the sensing signal. 々 '如:: The temperature control method according to item 7 of the monthly patent range, wherein when the temperature of at least the light source of the second light 7L is less than a reference temperature, the electric power is set to n τ ^ ^,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Or the voltage value is the second ^^^^^^, the operating current or voltage value is greater than the first operating current or voltage value. According to the temperature control method described in claim 8 (4), in the first, before the sensing unit senses the temperature of the at least one light source, the method further comprises: providing a circuit board and placing at least the 弁 原 原On the circuit board, when the sensing unit is disposed on the circuit board, the temperature of the circuit board measured by the sensing unit is used to obtain at least the temperature of the light source. 4 (5) electricity 10. If the patent application scope 9 ^.., the fascinating control method, JL, the sensing unit senses the circuit board / Wan Ling Ba Jia (10) degrees less than or equal to 120 degrees Celsius . 14