201238396 六、發明說明： 【發明所屬之技術領域】 本發明關於一種驅動電路，且特別是有關於一種發光 二極體（LED)驅動電路。 【先前技術】 隨著LED技術的發展，LED已越來越多的應用於各種 領域。因LED是直流驅動，所以LED往往多應用於直流驅 動的應用環境’比如手機等用電池供電的電子產品，又比 如電腦等設有專門的電源變換電路裝置（一般稱電源適配 器）的電子產品，但當要將LED應用於照明領域時，則需 要重新思考。 L E D不像普通的白熾燈泡可以直接連接2 2 0 V的交流市 電’ LED是2〜3V的低壓直流驅動，而且要考慮滿足照明 的要求’則必須要設計複雜的變換電路。由於LED是特性 敏感的半導體器件’又具有負溫度特性，因而在應用過程 中需要確保其處於穩定的工作狀態，所以LED器件對驅動 電源的要求近乎於苛刻。 現有LED驅動電路一般都會使用將交流市電轉換成直 流的裝置’如橋式整流器，並加入定電流元件，以確保led 工作於穩定的電流。因交流市電實質上是連續的正弦波， 經橋式整流器轉換後’變為連續的半正弦波，所以電壓是 在持續不停的反復上升和下降，這種上升和下降會對led 造成損傷，降低LED效率，甚至led的使用壽命。為了獲 4 201238396 得電壓變化幅錄㈣直錢，可以在料钱ϋ兩個輸 出端並聯-個電容來進彳了錢。但是由於電容的壽命 要比LED的壽命要短很多，這會導致縮短了整個⑽驅^ 電路的使用壽命。*且經過電容後，輸出的直流電上 還是會有持料停的反復上升和下降，只是變化的幅度較 小’這還會對晶片造成衝擊’影響晶片的壽命。 鑒於傳統直流LED在驅動電源方面的難題，故衍生出 交流LED。 交流LED是一類集成了各種處理技術的LED產品，它 包括複數個器件或内核，無需額外的變壓器、整流器或驅 動電路，交流電網的交流電就可直接對其進行驅動。這使 得LED產品可以直接應用於家居及辦公室交流電器插頭， 不僅顯著降低電路成本’也避免了電源變換過程中的能量 損失。交流LED可匹配至市電，所以交流led可以應用於 一般照明、看板、路燈和家用電器。但是交流LED驅動時 的電壓是處於變動的狀態，會產生亮暗的變化，對於信賴 性也是個挑戰。 交流LED因效率、良率、信賴性皆無法有效改善的情 況下，又產生了高壓LED。高壓LED在市電驅動時，亦會 因電壓、電流變動幅度過大，造成效率的下降及晶片的失 效。 【發明内容】 本發明的目的在於提供一種能有效保護LED免受電源 201238396 本身的變化而對LED帶來的損傷的LED驅動電路。 本發明的目的採用如下技術方案實現·· 輪出端，此輸入端與電源電性』 極體電性連接，將此電源提供給發光二 2並.¾動發先二極體點亮。此LED驅動電路主 壓ΐΐ組此及與此半導體開關電性連接的偏 2路關Μ電路包括第一電阻和與第一電阻電性連 導體開關具有三個電極，第一電 :丄ΓΓ齊納二極體的連接點電性連接。第二 模組的—端電性連接’第三電極與此第-電 =另-端構成輸出端。此第—齊納二極體的另一端和定 ^模組的另—端—起與此第—電阻的另—端構成輸入 此半導體開關可以是場效電晶體，此第一電極為閘 ，此第二電極為源極，此第三電極為汲極。 此疋電流模紐包括定電流元件以及與此定電流元件相 並聯的第二齊納二極體。 此定電流模組兩端並聯有電容以及與的此電容相串聯 的第二電阻。 此LED驅動電路的輸入端還設有整流電路，盥市電 性連接。 / 此整流電路為橋式整流電路。 此LED驅動電路的輸出端電性連接的發光二極體 壓發光二極體。 201238396 ，通過選擇適當規格的齊納二極體和定電 常工作時半導體開關問極的電位轉極 、 導體開關的閘極連接的第一齊納二 4同。虽與丰 ^崩潰點時’第一齊納二極體處於==升 ==開:的閘極與第一齊納二極體連接，_極 的電位與第-齊納二極體的負極的電位相同， 時2Γ:’關3、:進而帶動定電流元件工作，驅動發光 一極體點売，而且流過發光二極體 第一齊納二極體兩端的電壓低 ^’’·、:^-训·。田 閉，發光二極舰滅。H貝科，半導體開關關 昜效電曰曰體是-種南速開關元件，回應速度非常快。 關和定電流元件的配合，可以使發光二極體 找電流下點亮_狀態。發光二極體兩 如的祕上升和下㈣財常短，對晶片的衝擊很小。 ^發明的目的更採用如下技術方案實現：一種⑽驅 电性連接於一電源與一個或數個發光二極體之 以將此電源提供給此發光二極體並驅動此發光二極 體LED_€路主要包括—定電流模組、一半導 壓^星古一與此半導體開關電性連接的偏壓電路，此偏 ΐ—第一端、一電路内連接點及一第二端。此半 此第二/、有一第一電極、一第二電極以及一第三電極， -極與此偏壓電路之此電路内連接點電性連接。此 與此定電流模組的—端電性連接，此第三電_ 偏[電路的此第-端分別電性連接於此發光二極體。此 201238396 ，壓電路的此第二端和此定電流模組的另一端一起與此偏 壓電路的此第一端分別電性連接於該電源。 為讓本發明的上述特徵和優點能更明顯易懂，下文特 舉貫施方式，並配合附圖作詳細說明。 【實施方式】 第一實施例 s月參見如第1圖所示，本發明的第一實施例的LED b 動電路10，具有輸入端11和輸出端12。輸入端11包含ί 點Α及Β’輸入端12包含節點此輸入端η電性玉 =於一電源’此輸出端12與LED電性連接，將此電源提4 t發光二極體並驅動發光二極體點亮。在本實施例中，： I光一極體採用數個高壓發光二極體串聯和/或並聯組 σ，形成發光二極體陣列。發光二極體陣 „列兩端的電壓值來表示。此⑽驅動電路1〇^ 電流模組14、半導體開關Q11以及與此半導體開f 電性連接的偏壓電路13。此偏壓電路13包括第一= 中，偏:ΐ:?3阻：一：連f ·齊納二極體D12。; 端，坌，、有L —電路内連接點及一第· 第一鳊為第一電阻R11之上端，電路内連 端:Γ if 一第一齊納二極體D12之間的連接點:第: 體、三極管等各種3端半導體開關元 s曰體具有-_極«QUree)，—贿__)和一個開 8 201238396 之間的連接點；性連：電 和卓-齊納二極體D12 ㈤千卜诚、1 4連接，此源極與定電流模組14的一端 圖=上Μ電性連接，級極與此第—電阻r 成輸出端12,此第-齊納二極細的 一起與此二下=定電广_ 11。此定雷、、化/ ^ (圖示上端）構成輸入端 納由—個定電流元件NU和一個第二齊 並聯而成，第二齊納二極體d則以保護定 '丄定電流元件NU例如是N_定電流IC。 在本杏f你丨二電路10的輸入端11連接於整流電路D11， ，整流電路叫采用的是橋式整流器❹整 的兩個於i輸入端直接接於市電電源，整流電路Du 的兩個輸出端分別電性連接 交流電經過整产m A及B。原來正弦波的 期性直流輸出内有兩個正半部份的週 =:Γ為第一實施例'輸出端的;皮: 在恒定電5流可:使發光二極體只處於熄減和 和下降時間發光二極體兩端的電壓上升 流點亮發光m二的_很小。但縣段恒定電 的起妒ί):ί: '點（對應於市電每個正弦波 擊起始點）會產生尖學麵2〇，對晶片還會造成一定的衝 通過選擇適當規格的齊納二極體和電阻，使正常工作 201238396 時半導體開關閘極的電位比源極的電位高。當 帽的閉極連接的第-齊納二極體D12兩端的;= 升，並超過崩潰點時，第一齊納二極體D12處於正常工^ 狀態。由於半導體開關Q11 @閘極與第一齊納二極體 連接，所以閘極的電位等於第一齊納二極體m2的^ 電位，且恒定。這時半導體開關Q11導通，進而帶動定曾 流兀件Nil工作，流過高壓lED的電流為恒定電流，古 LED P車列點党。當電壓突波（spike)或漣波產[ 時’半導體開關Q11吸收掉多餘的電壓，從而可以保 電流元件14和發光二極體。當第一齊納二極體D12兩端^ 電壓低於崩潰點時，半導體開關Qn關閉，高壓發光二極 體熄滅。高壓發光二極體陣列可以採用工作電壓為 4個而壓發光二極體串並聯組成。例如發光二極體u 與發光二極體LED13串聯，發光二極體LED12與發光二極 體LED14串聯，然後將串聯後的發光二極體並聯，形成發 光二極體_。其中’節點c電性連接於發光二極體陣^ 的正極，節點D電性連接於發光二極體陣列的負極。 場效電晶體是一種高速開關元件，回應速度非常快。 通過半導體關Q11和定電流元件14的配合，可以使高壓 ，光二極體只處於熄滅和在恒定電流下點亮兩種狀態。高 壓發光二極體兩端的電壓上升和下降時間非常短，對晶^ 的衝擊很小。高壓LED I作時的電流的波形圖如第2圖所 示。 201238396 苐一貫施例 動雷=見3圖所示，本發明的第二實施例的led驅 點A及B 有輸入端31和輸出端32。輸入端31包含節 接於雷vf入端32包含節點C及D。此輸入端31電性連 此輸出端32與發光二極體電性連接，㈣ 中，此LED採用數個先一極體點兜。在本實施例 开m Γ 發光二極體串聯和/或並聯組合， 來r二極趙陣列的規格以發光二極 定電流喝⑽主要包括 電性舰B r 關Q31以及與此半導體開關⑽ =ϊ==33。此辑路33包括第-電_ "弟電阻R31電性連接的第一齊％_極# #cb 偏壓電路33且有1 : U一極體咖。其中， 咖及第一笛二 為’電路内連接點為第-電阻 第一齊iur極體D32之間的連接點，第二端為 效電曰=二下端°此半導體開關⑽可以是場 濟罝Γ ——極官等各種3端半導體削1元件。場效電晶 源搞盘A納一極體D32之間的連接點電性連接，此 二=電流模組34的一端（圖示上端）電性連接，此沒 此第I「電阻R31的另一端（圖示上端）構成輸出端32， 組34 Λϋ極體咖的另一端（圖示下端）和定電流模 、山、另一端（圖示下端）一起與此第一電阻R31的另一 端（圖不上端）構成輸入端31。此定電流模組34由一個 11 201238396 定電流元件N31和一個第二齊納二極體!)^並聯而成，第 二齊納二極體D33用以保護定電流元件N31，定電流元件 N31例如是NU501定電流ic。 此LED驅動電路3〇的輸入端31連接於整流電路 在本實施例中，此整流電路D31採用的是橋式整流器。整 流電路D31的兩個輪入端直接接於市電電源，整流電路d3i 的兩個輸出端分別電性連接於節點A及B。原來正弦波的 交流電經過整流後，形成一個週期内有兩個正半部份的週 期性直流輪出，提供給驅動電路使用。 通過選擇適當規格的齊納二極體和電阻，使正常工作 時半導體開關閘極的電位比源極的電位高。當與 關Q31的閘極連接的第—齊納二極體哪兩端的電壓逐漸 升南並超過崩潰點時，第一齊納二極體卿處於正常工作 狀態。由於半導體開目Q31㈣極與第一齊納二極體哪 連接’所以閘極的電位等於第一齊納二極體咖的負極的 電位，且恒定。這時半導體開關Q31導通，進而帶動定電 流兀件N31工作，流過高壓發光二極體的電流為恒定電 =L=列點亮。當電物_或漣波(咖) 產夺，+導體開關Q3卜及收掉多餘的電麗 護!_3?發光二極體。當第-齊納二 =知的電遷低於朋潰點時，半導體開關卿關閉，高塵發 光二極體熄滅。高Μ發光二極體_可以採用 ^ =個高嶋二極體串並聯組成。例如發光= -發光-極體LED33串聯，發光二極體LED32與發 201238396 光二極體LED34串聯，沙^ 形成發光二極體陣列。” ί聯後的發光二極體並聯， 體陣列的正極，節點h、/ ’㈣C電性連接於發光二極 如第3圖所示，杯日f接於發光二極體陣列的負極£ 區別主要在於，此定口的，二實施例與第-實施例纪 所此電容㈣聯的m ^ 兩端補有電容C以及輿 所干，IS 4一電阻紐。因為，請參見如第2 i 修本發一^^波形為第一實施例中輪出端的油 滅和在恒定電流下點亮兩種狀態，發光二極體 升和下降時間非常短，對晶片的衝t:: ;電::二=點亮發光二極體狀態的起始點（對應於 _ ，的起始點）會產生尖峰電壓20，對晶片還 會造成一定的衝擊。所以，用—個電容C與定電流元件· 並聯’可以籍每段恒U流點亮發光二極體狀態的瞬間 尖峰電壓20的影響。 …當然:’將本發明在不關家或地區使㈣，因各個國 豕或地區標準的市電規格不同，所以搭配的電阻及齊納二 極體的規格也應當作適當的調整。還需要根據不同的市電 標準選擇不同的發光二極體陣列的規格。 表一201238396 VI. Description of the Invention: [Technical Field] The present invention relates to a driving circuit, and more particularly to a light emitting diode (LED) driving circuit. [Prior Art] With the development of LED technology, LEDs have been increasingly used in various fields. Because LEDs are DC drives, LEDs are often used in DC-driven applications such as battery-powered electronic products such as mobile phones, and electronic products such as computers with special power conversion circuit devices (generally called power adapters). But when you want to apply LEDs to the field of lighting, you need to rethink. L E D is not like an ordinary incandescent bulb that can be directly connected to a 2 2 0 V AC mains. 'LEDs are 2 to 3 V low-voltage DC drives, and it is necessary to consider the lighting requirements.' A complex conversion circuit must be designed. Since LEDs are characteristic sensitive semiconductor devices, which have negative temperature characteristics, they need to be in a stable operating state during application, so the requirements for driving power sources of LED devices are almost severe. Existing LED driver circuits typically use a device that converts AC mains into a DC device, such as a bridge rectifier, and incorporates a constant current component to ensure that the LED operates at a steady current. Since the AC mains is essentially a continuous sine wave, it becomes a continuous half sine wave after being converted by the bridge rectifier, so the voltage is continuously rising and falling continuously, and this rise and fall will cause damage to the led. Reduce LED efficiency and even lead life. In order to get 4 201238396 voltage change records (four) straight money, you can put money in parallel with the two outputs at the two ends of the money. However, since the life of the capacitor is much shorter than the life of the LED, this will shorten the life of the entire (10) drive circuit. * And after the capacitor, the output DC power will continue to rise and fall repeatedly, but the magnitude of the change is small 'this will also impact the wafer' and affect the life of the wafer. In view of the difficulty of the conventional DC LED in driving the power supply, an AC LED is derived. AC LEDs are a type of LED product that integrates various processing technologies. It consists of a number of devices or cores that can be directly driven by AC power from the AC grid without the need for additional transformers, rectifiers or drive circuits. This allows LED products to be directly applied to household and office AC electrical plugs, which not only significantly reduces circuit cost, but also avoids energy loss during power conversion. AC LEDs can be matched to mains, so AC led can be applied to general lighting, billboards, street lights and household appliances. However, the voltage at the time of AC LED driving is in a state of change, which causes a change in brightness and darkness, which is also a challenge for reliability. When the AC LED cannot be effectively improved due to efficiency, yield, and reliability, high-voltage LEDs are generated. When the high-voltage LED is driven by the commercial power, the voltage and current vary too much, resulting in a decrease in efficiency and a failure of the wafer. SUMMARY OF THE INVENTION An object of the present invention is to provide an LED driving circuit capable of effectively protecting an LED from damage caused by a change in the power supply 201238396 itself. The object of the present invention is achieved by the following technical solution: The wheel terminal is electrically connected to the power source, and the power source is supplied to the light-emitting diode 2 and the light-emitting diode is illuminated. The LED driving circuit main pressing unit and the two-way switching circuit electrically connected to the semiconductor switch comprise a first resistor and a first resistor electrically connected to the conductor switch having three electrodes, the first electric: The connection point of the nano diode is electrically connected. The -terminal electrical connection of the second module 'the third electrode and the first-electrode=other-end constitute the output. The other end of the first Zener diode and the other end of the fixed module and the other end of the first resistor form an input. The semiconductor switch may be a field effect transistor, and the first electrode is a gate. The second electrode is a source, and the third electrode is a drain. The 疋 current mode includes a constant current element and a second Zener diode in parallel with the constant current element. The constant current module has a capacitor connected in parallel with the second resistor connected in series with the capacitor. The input end of the LED driving circuit is further provided with a rectifying circuit for electrical connection. / This rectifier circuit is a bridge rectifier circuit. The LED of the LED driving circuit is electrically connected to the LED body of the LED. 201238396, by selecting the appropriate size of the Zener diode and the constant potential of the semiconductor switch, the first Zener of the conductor switch is connected. Although the first Zener diode is at == liter == on: the gate of the first Zener diode is connected to the first Zener diode, the potential of the _ pole and the cathode of the first Zener diode The potential is the same, when 2Γ: 'Off 3,: and then drive the constant current component to work, driving the light-emitting one-pole point, and the voltage flowing across the first Zener diode of the light-emitting diode is low ^''· :^-训·. The field is closed and the light-emitting diode is destroyed. H Beike, the semiconductor switch off The 曰曰 曰曰 是 is a kind of south speed switch component, the response speed is very fast. The combination of the closing and constant current components allows the LED to illuminate in the state of current. The brightness of the LEDs rises and the bottom (4) is often short, and the impact on the wafer is small. The purpose of the invention is further achieved by the following technical solution: a (10) is electrically connected to a power source and one or several light emitting diodes to supply the power source to the light emitting diode and drive the light emitting diode LED_ The circuit mainly comprises a constant current module, a half-conducting voltage, and a bias circuit electrically connected to the semiconductor switch, the biasing terminal - the first end, an in-circuit connection point and a second end. The second/second has a first electrode, a second electrode and a third electrode, and the pole is electrically connected to the in-circuit connection point of the bias circuit. The electrical connection is connected to the terminal of the constant current module, and the third terminal of the circuit is electrically connected to the LED. In 201238396, the second end of the voltage circuit and the other end of the constant current module are electrically connected to the first end of the bias circuit respectively. The above features and advantages of the invention will be apparent from the description and appended claims [Embodiment] First Embodiment s Month Referring to Fig. 1, an LED b-circuit 10 of a first embodiment of the present invention has an input terminal 11 and an output terminal 12. The input terminal 11 includes ί and Β 'the input terminal 12 includes a node. The input terminal η is electrically jade=at a power source. The output terminal 12 is electrically connected to the LED, and the power source is provided with a light-emitting diode and drives the light. The diode is lit. In this embodiment, the I photo-polar body uses a plurality of high-voltage light-emitting diodes in series and/or in parallel with the group σ to form an array of light-emitting diodes. The light-emitting diode array is represented by voltage values at both ends of the column. The (10) driving circuit 1 is a current module 14, a semiconductor switch Q11, and a bias circuit 13 electrically connected to the semiconductor. 13 includes the first = medium, partial: ΐ: ? 3 resistance: one: even f · Zener diode D12.; end, 坌,, L - the internal connection point and the first · first The upper end of the resistor R11, the internal end of the circuit: Γ if the connection point between the first Zener diode D12: the body: the transistor, the triode, and the like, the three-terminal semiconductor switching element s body has -_ pole «QUree), - bribe __) and a connection point between 8 and 201238396; sexual connection: electric and Zhuo-Zina diode D12 (five) thousand Bucheng, 14 connection, one end of the source and constant current module 14 = upper electrical connection, the pole and the first resistor - the output terminal 12, the first - Zener two poles together with the second = fixed power _ 11. This is determined by lightning, and / ^ (Figure The upper end of the input terminal is formed by a constant current element NU and a second parallel connection, and the second Zener diode d is protected by a constant current element NU, for example, an N_ constant current IC. Ben apricot f The input terminal 11 of the second circuit 10 is connected to the rectifier circuit D11. The rectifier circuit is called a bridge rectifier. The two input terminals are directly connected to the mains power supply, and the two output terminals of the rectifier circuit Du are respectively powered. The connected alternating current passes through the whole production m A and B. The original sinusoidal DC output has two positive half cycles =: Γ is the output of the first embodiment; skin: at constant current 5 flows: The illuminating diode is only in the extinction and falling time. The voltage rises across the illuminating diode to illuminate the illuminating m 2 _ very small. But the county is constant electric 妒 ί): ί: 'point (corresponding to Each sine wave strike starting point of the mains will produce a sharp surface 2〇, which will also cause a certain punch on the wafer. By selecting the appropriate size of the Zener diode and resistor, the potential of the semiconductor switch gate during normal operation 201238396 The potential of the source is higher than that of the source. When the end of the cap-Zener diode D12 of the cap is connected to the collapse point, the first Zener diode D12 is in the normal state. The switch Q11 @ gate is connected to the first Zener diode, so the gate The bit is equal to the potential of the first Zener diode m2, and is constant. At this time, the semiconductor switch Q11 is turned on, thereby driving the current flow device Nil to work, and the current flowing through the high voltage lED is a constant current, the ancient LED P car point party When a voltage spike or chopping occurs [when the semiconductor switch Q11 absorbs excess voltage, it can protect the current component 14 and the light-emitting diode. When the first Zener diode D12 has a low voltage at both ends At the point of collapse, the semiconductor switch Qn is turned off, and the high-voltage light-emitting diode is extinguished. The high-voltage light-emitting diode array can be composed of four operating voltages and a series of piezoelectric diodes connected in parallel. For example, the light-emitting diode u is connected in series with the light-emitting diode LED 13, the light-emitting diode LED 12 is connected in series with the light-emitting diode LED 14, and the light-emitting diodes connected in series are connected in parallel to form a light-emitting diode. Wherein the node c is electrically connected to the positive electrode of the light-emitting diode array, and the node D is electrically connected to the negative electrode of the light-emitting diode array. The field effect transistor is a high-speed switching element that responds very quickly. By the cooperation of the semiconductor off Q11 and the constant current element 14, the high voltage and the photodiode can be turned on only in a state of being extinguished and being lit at a constant current. The voltage rise and fall times across the high voltage LED are very short and have little impact on the crystal. The waveform of the current when the high voltage LED I is used is shown in Fig. 2. 201238396 苐 Consistently applied examples Thunder = As shown in Fig. 3, the LED drive points A and B of the second embodiment of the present invention have an input terminal 31 and an output terminal 32. Input 31 includes a link to the mine vf entry 32 containing nodes C and D. The input terminal 31 is electrically connected to the output terminal 32 and electrically connected to the LED. In (4), the LED adopts a plurality of first-pole pockets. In this embodiment, the m Γ LEDs are connected in series and/or in parallel, and the specifications of the r dipole Zhao array are controlled by the illuminating diode current (10) mainly including the electric ship B r off Q31 and with the semiconductor switch (10) = ϊ==33. The circuit 33 includes a first % 电 弟 弟 弟 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 弟 弟 弟 弟 弟 弟 弟Among them, the coffee and the first flute two are the connection point between the first connection point of the circuit and the first-order iur pole body D32, and the second end is the power supply 曰=two lower ends. The semiconductor switch (10) can be a field.罝Γ ———————————————————————————————————————————————— The field effect electric crystal source is electrically connected to the connection point between the A and the body D32, and the two ends of the current module 34 (the upper end of the figure) are electrically connected, and the first one is not the other one of the resistors R31. One end (upper end of the figure) constitutes the output end 32, and the other end of the group 34 Λϋ 体 ( (the lower end of the figure) is combined with the constant current mode, the mountain, and the other end (the lower end of the figure) together with the other end of the first resistor R31 ( The upper end of the figure constitutes the input terminal 31. The constant current module 34 is formed by a parallel connection of a 2012-03396 constant current component N31 and a second Zener diode!), and the second Zener diode D33 is used for protection. The constant current element N31, the constant current element N31 is, for example, a NU501 constant current ic. The input terminal 31 of the LED driving circuit 3A is connected to the rectifying circuit. In the present embodiment, the rectifying circuit D31 is a bridge rectifier. The two wheel terminals are directly connected to the mains power supply, and the two output terminals of the rectifier circuit d3i are electrically connected to the nodes A and B respectively. The original sinusoidal alternating current is rectified to form two positive half in one cycle. Periodic DC rotation, provided to the drive circuit By selecting the appropriate size of the Zener diode and the resistor, the potential of the semiconductor switch gate during normal operation is higher than the potential of the source. When the gate is connected to the gate of the Q31, which two Zener diodes are connected. When the voltage of the terminal gradually rises south and exceeds the collapse point, the first Zener diode is in normal working state. Since the semiconductor opening Q31 (four) pole is connected with the first Zener diode, the potential of the gate is equal to the first The potential of the negative pole of the nano-diode is constant, and the semiconductor switch Q31 is turned on, and then the constant current element N31 is operated, and the current flowing through the high-voltage light-emitting diode is constant electric=L=column lighting. _ or 涟波 (咖) production, + conductor switch Q3 Bu and remove the excess electric care! _3? Light-emitting diode. When the first - Zener two = know the electromigration is lower than the peer point, the semiconductor The switch is turned off, and the high-dust LED is extinguished. The sorghum LED can be composed of ^= a high-voltage diode connected in parallel. For example, the light-emitting-polar LED33 series, the LED LED32 and the light emitting diode 201238396 Light diodes LED34 are connected in series, sand ^ forms a light-emitting diode Array.” The light-emitting diodes in parallel are connected in parallel, the positive electrode of the body array, the nodes h, / '(4)C are electrically connected to the light-emitting diodes as shown in Fig. 3, and the cups are connected to the negative electrodes of the light-emitting diode array. The difference mainly lies in the fact that the m ^ ends of the capacitors (four) of the second embodiment and the second embodiment are complemented by capacitors C and 舆, IS 4 - resistors. Because, please refer to the waveform as the 2nd revision, the oil is extinguished at the wheel end in the first embodiment, and the two states are lit at a constant current. The rise and fall times of the LED are very short, on the wafer. The rushing t:: ; electric:: two = the starting point of the lighting diode state (corresponding to the starting point of _,) will produce a spike voltage of 20, which will also cause a certain impact on the wafer. Therefore, by using a capacitor C and a constant current element in parallel, the effect of the instantaneous spike voltage 20 of the state of the light-emitting diode can be illuminated by each constant U-flow. ... Of course: 'The invention will be made in the home or area (4). Because of the different mains specifications of each country or region, the specifications of the matching resistors and Zener diodes should also be adjusted appropriately. It is also necessary to select different LED array specifications according to different mains standards. Table I
第一電阻（Ω) 第一齊納二極 體規格(V) 第二齊納二極 體規格(V) LED陣列規格 (V) 曰本(100V) 820K 8V 10V 100V 臺灣（110V) 820K 8V 10V 100V 大陸（220V) 1.5M 8V 10V 200V 雖然本發明已以貫施例揭露如上，然其並非用以限定 13 201238396 本發明，任何所屬技術領域中具有通常知識者，在不脫離 本發明之精神和範圍内，當可作些許之更動與潤飾，故本 發明之保護範圍當視後附之申請專利範圍所界定者為準。 【圖式簡單說明】 第1圖是本發明第一實施例的LED驅動電路圖。 第2圖是本發明第一實施例中流過LED的電流的波形 圖。 第3圖是本發明第二實施例的LED驅動電路圖。 【主要元件符號說明】 10、 30 : LED驅動電路 11、 31 :輸入端 12、 32 :輸出端 13、 33 :偏壓電路 14、 34 :定電流模組 20 :尖峰電壓 21 :整流後的波形圖 22 :輸出端的波形 A、B、C、D :節點 C31 :第一電容 D11、D31 :整流電路 D12、D32 :第一齊納二極體 D13、D33 :第二齊納二極體 14 201238396 LED1 卜 LED12、LED13、LED14、LED3 卜 LED32、 LED33、LED34 :發光二極體 Nil、N31 :定電流元件First resistance (Ω) First Zener diode specification (V) Second Zener diode specification (V) LED array specification (V) 曰本(100V) 820K 8V 10V 100V Taiwan (110V) 820K 8V 10V 100V Continental (220V) 1.5M 8V 10V 200V Although the present invention has been disclosed above by way of example, it is not intended to limit the invention of the present invention, which is not limited to the spirit of the present invention. In the scope of the invention, the scope of protection of the invention is defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a circuit diagram of an LED driving circuit according to a first embodiment of the present invention. Fig. 2 is a waveform diagram showing the current flowing through the LED in the first embodiment of the present invention. Fig. 3 is a circuit diagram of an LED drive circuit of a second embodiment of the present invention. [Main component symbol description] 10, 30: LED drive circuit 11, 31: Input terminal 12, 32: Output terminal 13, 33: Bias circuit 14, 34: Constant current module 20: Peak voltage 21: Rectified Waveform 22: Waveforms A, B, C, D at the output: Node C31: First capacitor D11, D31: Rectifier circuit D12, D32: First Zener diode D13, D33: Second Zener diode 14 201238396 LED1 Bu LED12, LED13, LED14, LED3 Bu LED32, LED33, LED34: Light-emitting diode Nil, N31: Constant current component
Qll、Q31 :半導體開關 R11、R31 :第一電阻 R32 :第二電阻 15Qll, Q31: semiconductor switch R11, R31: first resistor R32: second resistor 15