201236498 六、發明說明： 【發明所屬之技術領域】 [0001] 本發明係有關於一種發光二極體的保護模組，尤指一種 發光二極體的過溫保護模組。 【先前技術·】 [0002] 發光二極體（1 i ght em i 11 i ng d i ode, LED)具有高發光 效率、使用壽命長、體積小及環保無汞等特點，使其超 越白熾燈及螢光燈泡，並領導照明領域進入一個固態照 明的新時代。 [0003] 然而，發光二極體相較於其他光源而言，功率愈大的發 光二極體愈容易產生散熱的問題，其主因在於發光二極 體無法透過紅外線輻射以進行散熱。一般而言，過高的 工作溫度會使得發光二極體減少光輸出量（光衰）及產生 色偏，並加速發光二極體的老化，使其使用壽命縮短。 [0004] 一般而言，發光二極體會於其產品說明書中標明其於不 同環境溫度下的最高容許電流的溫度-電流曲線圖，如第 一圖所示。當發光二極體的工作溫度低於一臨界溫度Tc ，導通於發光二極體之最高容許導通電流Imax不變（及維 持在一固定值）；而當發光二極體的工作溫度高於該臨界 溫度Tc，導通於發光二極體之最高容許導通電流Imax係 隨著溫度的升高而不斷地降低。為確保發光二極體於使 用狀態下不產生光衰及色偏的問題及其使用壽命不縮短 ，勢必避免發光二極體於工作溫度上升時，仍持續地導 通一固定的電流。 100105294 習知之發光二極體過溫保護模組係供連接於一發光二極 表單編號A0101 第4頁/共15頁 1002009081-0 [0005] 201236498 體串列兩端，該發光二極體串列係由複數個發光二極體 組成。當該發光二極體串列周圍之工作溫度上升時，該 發光二極體過溫保護模組係直接地降低連接於該發光二 極體串列之一電源電路的輸出電流，以避免該發光二極 體串列於高溫及高電流環境下操作。但是，藉由調整導 通於該發光二極體串列之電流係可能造成部份未過溫之 發光二極體的工作效率降低，致使該部分之發光二極體 無法達到最大光亮度輸出，亦即使該等發光二極體不能 均勻光亮度的輸出，而影響整體的照明品質。201236498 VI. Description of the Invention: [Technical Field] [0001] The present invention relates to a protection module for a light-emitting diode, and more particularly to an over-temperature protection module for a light-emitting diode. [Previous Technology·] [0002] LEDs (1 i ght em i 11 i ng di ode, LED) have high luminous efficiency, long service life, small size, and environmentally friendly mercury-free characteristics, making them surpass incandescent lamps and Fluorescent light bulbs and lead the field of lighting into a new era of solid-state lighting. [0003] However, the higher the power of the light-emitting diode, the more the light-emitting diode is more likely to cause heat dissipation than the other light sources, and the main reason is that the light-emitting diode cannot transmit infrared radiation to dissipate heat. In general, an excessively high operating temperature causes the light-emitting diode to reduce the light output (light decay) and color shift, and accelerate the aging of the light-emitting diode to shorten its service life. [0004] In general, a light-emitting diode will have a temperature-current graph indicating its maximum allowable current at different ambient temperatures in its product specification, as shown in the first figure. When the operating temperature of the light-emitting diode is lower than a critical temperature Tc, the maximum allowable on-current Imax of the light-emitting diode is constant (and maintained at a fixed value); and when the operating temperature of the light-emitting diode is higher than the The critical temperature Tc, the maximum allowable on-current Imax that is conducted to the light-emitting diode, continuously decreases as the temperature increases. In order to ensure that the light-emitting diode does not cause light decay and color shift in use, and its service life is not shortened, it is inevitable that the light-emitting diode will continue to conduct a constant current when the operating temperature rises. 100105294 The light-emitting diode over-temperature protection module is connected to a light-emitting diode form number A0101. Page 4 / Total 15 pages 1002009081-0 [0005] 201236498 Both ends of the body string, the LED array It consists of a plurality of light-emitting diodes. When the operating temperature around the series of the LEDs rises, the LED over-temperature protection module directly reduces the output current connected to one of the series circuits of the LEDs to avoid the illumination. The diodes are operated in series in high temperature and high current environments. However, by adjusting the current system that is connected to the LED array, the operating efficiency of the portion of the LED that is not over-temperature may be reduced, so that the portion of the LED cannot achieve maximum brightness output. Even if the light-emitting diodes do not have uniform light output, they affect the overall illumination quality.
[0006] [0007] 〇 【發明内容】 鑒於先前技術所述，本發明之一目的，在於提供一種發 光二極體的保護模組。該發光二極體保護模組係供電連 接於一發光二極體，且該發光二極體導通有一導通電流 ，該發光二極體保護模組包含一感測單元、一控制單元 及一開關元件。 該感測單元包含一温度感測電路，該溫度感測電路設置 鄰近於該發光二極體且電連接於該發光二極體；該控制 單元電連接於該感測單元；該開關元件電連接於該發光 二極體及該控制單元；其中，該溫度感測電路係感測該 發光二極體的工作溫度，且於該發光二極體的工作溫度 大於一臨界溫度時，傳送一溫度感測信號至該控制單元 ，並關閉該開關元件，使該導通電流經由該開關元件分 流。 根據本發明的一具體實施例，其中該感測單元更包含一 電流感測電路，電連接於該發光二極體，以感測該導通 100105294 表單編號Α0101 第5頁/共15頁 1002009081-0 [0008] 201236498 電流，並傳遞一電流感測信號予該控制單元。 [0009] 根據本發明的一具體實施例，該發光二極體保護電路更 包含一電阻器，電連接於該感測單元、該控制單元及該 開關元件，該控制單元係依據該電流感測信號以調整該 電阻器的阻值，使該導通電流分流。 [0010] 根據本發明的一具體實施例，其中該感測單元更包含一 電壓感測電路，電連接於該發光二極體，供感測該發光 二極體的電壓，且當該發光二極體兩端之電壓大於一發 光二極體順向導通電壓，係傳遞一電壓感測信號予該控 制單元，使關閉該開關元件。 [0011] 根據本發明的一具體實施例，其中該感測單元更包含一 設定電路，以供設定對應該發光二極體之工作參數。 [0012] 根據本發明的一具體實施例，其中該開關元件為常開式 的開關元件。 [0013] 本發明之發光二極體保護模組係透過一溫度感測單元以 貼近地偵測發光二極體的溫度，並藉由該控制單元有效 地調整該開關元件的開啟或關閉，以有效地利用分流以 避免導通於發光二極體之導通電流過大而造成光衰及使 用壽命降低等問題。並且，該發光二極體保護模組之該 電壓感測單元係可以有效地感測發光二極體兩端的電壓 ，達到避免單一發光二極體斷路造成整體發光二極體串 列不堪使用的情形產生，進而大幅地提升整體之發光二 極體的使用效率。 【實施方式】 100105294 表單編號 A0101 第 6 頁/共 15 頁 1002009081-0 201236498 [0014] Ο [0015] [0016] 〇 配合參閱第二圖，為本發明之發光二極體保護模組之電 路方壤圖。该發光一極體保護模組1 〇係電連接於發光二 極體50兩侧，因此，一由複數個發光二極體50組成之發 光二極體串列，係需要數量對應該等發光二極體5〇之發 光二極體保護模組10，且該等發光二極體保護模組1〇係 分別對應地電連接於該等發光二極體5〇兩侧。各該發光 —極體保護模組10係依據各該發光二極體5〇之工作溫度 ’而對應地調整導通於該發光二極體50之導通電流ILED ，使該等發光二極體50可以達到最佳光亮度且穩定光亮 度的發光，進而避免任一之發光二極體50於過高溫度及 過高電流操作下，光衰現象的產生。 .· . .... s發光一極體保護模組1 〇包含一感測單元、—控制單 凡120及一開關元件13〇。 °玄感測單元110電連接於該發光二極體50及該控制單元 12〇，该感測單元丨1 〇包含一溫度感測電路112、一電壓 感' !電路114及一電流感測電..路該溫度感測電路 112設置鄰近於該發光二極體50，以貼近地感測對應連接 之該發光二極體50的工作溫度，並傳送一溫度感測信號 至該控制單元120。該電壓感測電路112係感測對應之該 發光二極體兩端之導通電壓VLED，並傳送一電壓感測 信號至該控制單元120。該電流感測電路116係感測導通 於對應之該發光二極體50的導通電流ILED，並傳送一電 流感測信號至該控制單元丨2〇。 [0017] 100105294 該控制單元120包含有一設定電路122，可供使用者依據 對應連接於各該發光二極體保護模組1 〇之發光二極體5 〇 表單編號A0101 第7頁/共15頁 1002009081-0 201236498 [0018] [0019] [0020] 100105294 的工作參數作設定，以有效地使該等發光二極體5 〇皆達 到最佳的工作效率（亦即最佳的光亮度輸出）。該控制單 元120電連接於該感測單元110，以接收由該感測單元 110所傳遞之該溫度感測信號、該電壓感測信號及該電流 感測信號，並且該控制單元120係藉由判斷該溫度感測信 號、该電壓感測信號及該電流感測信號，以進一步地決 定欲開啟（open )或關閉（c 1 osed)該開關元件13〇。 該開關元件130係電連接於該控制單元12〇，並且，該開 關元件130係為一常開式（normally open)開關，意即 該開關元件130於無作用時，係保持於開路狀態，以有效 地避免該導通電流IL E D於非必要.時被.分流:》 . . 另外，该發光二極體保護模祖1(}.更包含'.一電阻器14〇，電 連接於該控制單元120及串聯連接於該開關元件13〇，該 控制單元1 2 0係可以依據該感測單元11 〇傳遞之電流感測 信號以調整該電阻器140之阻值，進而達到導通於該開關 元件130之電流值的控制。 於實際使用時，當該等發光二極體50的工作溫度小於一 臨界溫度Tc(如第一圖所示），該等發光二極體保護模組 10之該感測單元11〇係僅供持續地偵測該等發光二極體5〇 的工作溫度、工作電壓及導通電流ILED，並傳遞對應之 溫度感測信號、電壓感測信號及電流感測信號予該控制 單元120。由於該控制單元12〇接受到之該溫度感測信號 、電壓感測k號及該電流感測信號皆未超過設定值，則 不輸出一啟動信號以關閉該開關元件13〇，使保持該開關 元件130的開路狀態。該導通電流ILED係直接地導通於該 表單編號A0101 第8頁/共15頁 1002009081-0 201236498 [0021] Ο [0022][0007] [0007] In view of the prior art, it is an object of the present invention to provide a protection module for a light-emitting diode. The light-emitting diode protection module is electrically connected to a light-emitting diode, and the light-emitting diode is turned on to have a conducting current. The light-emitting diode protection module comprises a sensing unit, a control unit and a switching element. . The sensing unit includes a temperature sensing circuit disposed adjacent to the LED and electrically connected to the LED; the control unit is electrically connected to the sensing unit; the switching element is electrically connected The light-emitting diode and the control unit; wherein the temperature sensing circuit senses an operating temperature of the light-emitting diode, and transmits a temperature sense when the operating temperature of the light-emitting diode is greater than a critical temperature A signal is measured to the control unit, and the switching element is turned off to cause the on current to be shunted via the switching element. According to an embodiment of the invention, the sensing unit further includes a current sensing circuit electrically connected to the LED to sense the conduction 100105294 Form No. 1010101 Page 5 / Total 15 Page 1002009081-0 [0008] 201236498 current, and a current sensing signal is transmitted to the control unit. According to an embodiment of the invention, the LED protection circuit further includes a resistor electrically connected to the sensing unit, the control unit and the switching component, and the control unit is configured according to the current sensing. A signal is used to adjust the resistance of the resistor to shunt the on current. According to an embodiment of the present invention, the sensing unit further includes a voltage sensing circuit electrically connected to the light emitting diode for sensing a voltage of the light emitting diode, and when the light emitting diode The voltage across the pole body is greater than the forward voltage of the light emitting diode, and a voltage sensing signal is transmitted to the control unit to turn off the switching element. According to an embodiment of the invention, the sensing unit further includes a setting circuit for setting an operating parameter corresponding to the LED. [0012] According to an embodiment of the invention, the switching element is a normally open switching element. [0013] The light-emitting diode protection module of the present invention detects the temperature of the light-emitting diode closely through a temperature sensing unit, and effectively adjusts the opening or closing of the switching element by the control unit. The shunt is effectively utilized to avoid problems such as excessive light conduction and low lifetime of the light-emitting diode. Moreover, the voltage sensing unit of the LED protection module can effectively sense the voltage across the LED body, so as to avoid the use of the single LED dipole to cause the whole LED dipole to be unusable. Produced, thereby greatly improving the efficiency of use of the overall light-emitting diode. [Embodiment] 100105294 Form No. A0101 Page 6 of 15 1002009081-0 201236498 [0014] [0016] Referring to the second figure, the circuit of the LED protection module of the present invention is shown. Earth map. The light-emitting diode protection module 1 is electrically connected to the two sides of the light-emitting diode 50. Therefore, a series of light-emitting diodes composed of a plurality of light-emitting diodes 50 are required to be correspondingly illuminated. The light-emitting diode protection module 10 of the polar body 5 is electrically connected to the two sides of the light-emitting diodes 5 respectively. Each of the light-emitting diode protection modules 10 adjusts the conduction current ILED that is conducted to the light-emitting diode 50 according to the operating temperature of each of the light-emitting diodes 5, so that the light-emitting diodes 50 can The light that achieves the best brightness and stabilizes the brightness, thereby avoiding the occurrence of light decay phenomenon in any of the light-emitting diodes 50 under excessive temperature and excessive current operation. . . . . s illuminating one-pole protection module 1 〇 comprises a sensing unit, a control unit 120 and a switching element 13 〇. The sensing unit 110 is electrically connected to the LEDs 50 and the control unit 12A. The sensing unit 〇1 〇 includes a temperature sensing circuit 112, a voltage sense '! circuit 114, and a current sensing circuit. The temperature sensing circuit 112 is disposed adjacent to the LEDs 50 to closely sense the operating temperature of the correspondingly connected LEDs 50 and transmit a temperature sensing signal to the control unit 120. The voltage sensing circuit 112 senses the on-voltage VLED corresponding to the two ends of the LED and transmits a voltage sensing signal to the control unit 120. The current sensing circuit 116 senses the conduction current ILED corresponding to the corresponding LED 50 and transmits an electrical influenza signal to the control unit 丨2〇. [0017] 100105294 The control unit 120 includes a setting circuit 122 for the user to connect to the LEDs 5 of the LED protection module 1 〇 Form No. A0101 Page 7 of 15 1002009081-0 201236498 [0019] [0020] The operating parameters of 100105294 are set to effectively achieve optimal operating efficiency (ie, optimal brightness output) for the LEDs. The control unit 120 is electrically connected to the sensing unit 110 to receive the temperature sensing signal, the voltage sensing signal and the current sensing signal transmitted by the sensing unit 110, and the control unit 120 is controlled by The temperature sensing signal, the voltage sensing signal, and the current sensing signal are determined to further determine whether the switching element 13 is to be turned on or off. The switching element 130 is electrically connected to the control unit 12A, and the switching element 130 is a normally open switch, that is, when the switching element 130 is inactive, it is kept in an open state, Effectively avoiding the on-current IL ED being shunted when it is not necessary. In addition, the light-emitting diode protection die 1 (}. further includes '. a resistor 14 〇 electrically connected to the control unit 120 and connected in series to the switching element 13 〇, the control unit 120 can adjust the resistance of the resistor 140 according to the current sensing signal transmitted by the sensing unit 11 ,, thereby achieving conduction to the switching element 130 The current value is controlled. In actual use, when the operating temperature of the light emitting diodes 50 is less than a critical temperature Tc (as shown in the first figure), the sensing of the light emitting diode protection module 10 The unit 11 is only for continuously detecting the operating temperature, the working voltage and the conduction current ILED of the LEDs 5, and transmitting corresponding temperature sensing signals, voltage sensing signals and current sensing signals to the control. Unit 120. Because of this control When the temperature sensing signal, the voltage sensing k number, and the current sensing signal received by the unit 12 do not exceed the set value, an activation signal is not output to turn off the switching element 13A, so that the switching element 130 is maintained. Open circuit state. The on current ILED is directly connected to the form number A0101. Page 8 of 15 1002009081-0 201236498 [0021] 002 [0022]
[0023] 等發光二極體50，供該等發光二極體50穩定光亮度的發 光。 此外，當任一之發光二極體50其工作溫度等於或大於該 臨界溫度Tc(如第一圖所示），則該發光二極體保護模組 10之該控制單元120係依據該感測單元110所提供之一溫 度感測信號驅動該開關元件130，使該開關元件130關閉 ;同時間，該控制單元120亦接受該電流感測電路116輸 出之一電流感測信號，並藉由該電流感測信號以調整該 電阻器140的阻值，而達到控制流經該開關元件130之電 流量，致使導通於該發光二極體50之導通電流ILED對應 目前工作溫度（Tc + Z\T)而維持在一能提供該發光二極體 50最佳光亮度輸出之電流值（Ι-ΛΙ)。另外，該電阻器 140係回饋目前工作阻值予該電流感測電路116，致使該 電流感測單元116於下一工作溫度時，能準確且快速地調 整該電阻器140的阻值。 又，當該感測單元110之該電壓感測電路114於該發光二 極體50兩端感測到一大於該發光二極體50順向導通電壓 (Vf)之導通電壓VLED時係可以判斷該發光二極體50已損 毁，亦即呈現斷路，並傳遞一電壓感測信號予該控制單 元120，趨使該控制單元120係關閉該開關元件130，並 藉由該電流感測單元116降低該電阻器140的阻值，使導 遽於該發光二極體50之導通電流ILED全數地導通於該開 關元件130，以避免單一斷路的發光二極體50導致該發光 二極體串列停止發光。 綜合以上所述，本發明之發光二極體保護模組10係透過 100105294 表單編號A0101 第9頁/共15頁 1002009081-0 201236498 該溫度感測單元11 2以貼近地偵測發光二極體5 0的溫度， 並藉由該控制單元120有效地調整該開關元件130的開啟 或關閉，有效地利用分流作用以避免導通於發光二極體 50之導通電流ILED過大而造成光衰及使用壽命降低等問 題。又，該發光二極體保護模組10之該電壓感測單元114 係可以有效地感測發光二極體50兩端的電壓，達到避免 單一發光二極體50斷路而造成整個發光二極體串列不堪 使用的情形產生，進而大幅地提升整體之發光二極體50 的使用效率。 [0024] 然以上所述者，僅為本發明之較佳實施例，當不能限定 本發明實施之範圍，即凡依本發明申請專利範圍所作之 均等變化與修飾等，皆應仍屬本發明之專利涵蓋範圍意 圖保護之範疇。 【圖式簡單說明】 [0025] 第一圖為發光二極體之電流對溫度曲線圖。 [0026] 第二圖為本發明之發光二極體保護模組之電路方塊圖。 【主要元件符號說明】 [0027] 1 0發光二極體保護模組 [0028] 1 1 0感測單元 [0029] 1 1 2溫度感測電路 [0030] 1 1 4電壓感測電路 [0031] 116電流感測電路 [0032] 12 0控制單元 100105294 表單編號Α0101 第10頁/共15頁 1002009081-0 201236498 ' [0033] [0034] [0035] [0036] [0037] 122設定電路 130開關元件 140電阻器 ILED導通電流 VLED導通電壓 〇 100105294 表單編號A0101 第11頁/共15頁 1002009081-0[0023] The light-emitting diodes 50 are provided for the light-emitting diodes 50 to stabilize the light emission. In addition, when the operating temperature of any of the LEDs 50 is equal to or greater than the critical temperature Tc (as shown in the first figure), the control unit 120 of the LED protection module 10 is based on the sensing. The temperature sensing signal provided by the unit 110 drives the switching element 130 to turn off the switching element 130. Meanwhile, the control unit 120 also receives a current sensing signal output by the current sensing circuit 116, and The current sensing signal adjusts the resistance of the resistor 140 to control the amount of current flowing through the switching element 130, so that the conduction current ILED that is turned on the LED 20 corresponds to the current operating temperature (Tc + Z\T). And maintaining a current value (Ι-ΛΙ) capable of providing an optimum light output of the light-emitting diode 50. In addition, the resistor 140 feedbacks the current operating resistance to the current sensing circuit 116, so that the current sensing unit 116 can accurately and quickly adjust the resistance of the resistor 140 at the next operating temperature. Moreover, when the voltage sensing circuit 114 of the sensing unit 110 senses a turn-on voltage VLED greater than the forward voltage (Vf) of the light-emitting diode 50 at both ends of the light-emitting diode 50, the system can determine The light-emitting diode 50 is damaged, that is, it is broken, and a voltage sensing signal is transmitted to the control unit 120, so that the control unit 120 turns off the switching element 130 and is lowered by the current sensing unit 116. The resistance of the resistor 140 is such that the conduction current ILED of the LED 50 is completely turned on to the switching element 130 to prevent the single-circuit LED 20 from causing the LED to stop. Glowing. In summary, the light-emitting diode protection module 10 of the present invention transmits 100105294 Form No. A0101 Page 9/15 pages 1002009081-0 201236498 The temperature sensing unit 11 2 detects the LEDs 5 in close proximity. The temperature of 0, and the control unit 120 effectively adjusts the opening or closing of the switching element 130, effectively utilizing the shunting function to avoid the conduction current ILED that is conducted to the LED body 50 is too large, resulting in light decay and reduced service life. And other issues. Moreover, the voltage sensing unit 114 of the LED protection module 10 can effectively sense the voltage across the LEDs 50, so as to avoid the single LED diode 50 being disconnected and causing the entire LED string. The use of the column is unusable, which in turn greatly improves the efficiency of the overall light-emitting diode 50. [0024] The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the equivalent changes and modifications made by the scope of the present invention should still belong to the present invention. The patent covers the scope of the intent to protect. BRIEF DESCRIPTION OF THE DRAWINGS [0025] The first figure is a current versus temperature graph of a light emitting diode. The second figure is a circuit block diagram of a light-emitting diode protection module of the present invention. [Main component symbol description] [0027] 10 0 LED protection module [0028] 1 1 0 sensing unit [0029] 1 1 2 temperature sensing circuit [0030] 1 1 4 voltage sensing circuit [0031] 116 Current Sensing Circuit [0032] 12 0 Control Unit 100105294 Form Number Α 0101 Page 10 / Total 15 Page 1002009081-0 201236498 '[0033] [0036] [0037] 122 Setting Circuit 130 Switching Element 140 Resistor ILED On Current VLED On Voltage 〇100105294 Form No. A0101 Page 11 / Total 15 Page 1002009081-0