M357021 八、新型說明： 【新型所屬之技術領域】 本創作係關於一種背光模組之光源系統，尤其係一種應用於發光二極體驅 動電路。 【先前技術】 第一圖係為習知的發光二極體驅動電路10,其係由一整流電路12耦接一降 -壓式轉換器14，再由數個串接發光二極體d2做為負載輸出。其中，整流電路 鲁.12包含一橋式整流器Ds與一電容C,;降壓式轉換器14包含一電晶體元件、 一脈衝寬度模組16、一飛輪二極體D,、一電感L!與一電容<：2。其訊號作用係 以交流電源做為輸入訊號，經由整流電路將交流電源轉為漣波訊號，而脈波寬 度模組16控制電晶體Q,工作週期。於電晶體Q]導通時，漣波訊號對電感^ 與電容C2進行充電，且由漣波訊號以及電感Li與電容C2所釋放的儲能驅動發 光二極體A ;於電晶體Q,截止時，電感Li釋放之電流與電容C2、發光二極體 D2與飛輪二極體Di之間形成迴路，以提供發光二極體發光D2。 • 然而’交流電源於正負電轉換時，因交流輸入漣波無法有效抑制，導致整 流電路所提供的輸入漣波發生間斷的情形，而無法提 量，發光二減她謎。Η面训陳極幽= 電#須為大谷董電容阻抗，這項限制也導致此驅動電路體積無法縮小，另外， -此種驅動電路其雛鱗低，因此種種許多_無法達到市場所要求。 有鐘於此’本創作即針對上述習知技術中存在的種種問題，改變發光二極 體驅動電路架構’以有效解決存在於先前技術巾之該些問題。 【新型内容】 5 M357021 本創作之主要目的係提供一發光二極體驅動迴路，係將内部電路結構改 變，以降轉負壓的方式，解決發光二極體閃燦的現象，且提高其轉換效率。 本創作之另-目的係提供—發光二極體驅動迴路，無需賴大容量的電容 器，以縮小此發光二極體驅動迴路所佔用空間。 為達到上述目的’本創作係提供—種發光二極體驅動迴路，其中係包括一 交流電源、一整流電路、一開關开Α . ^, 開關兀件、一脈衝寬度模組、一整流二極體、一儲 能電感、一輸出電容以及一倉巷雷攸 ^,私丄 汉貞戰電路。其中，整流電路包含—橋式整流器並聯M357021 VIII. New Description: [New Technology Field] This creation is about a light source system for a backlight module, especially for a light-emitting diode driving circuit. [Prior Art] The first figure is a conventional LED driving circuit 10, which is coupled to a down-converter 14 by a rectifying circuit 12, and then is connected by a plurality of serially connected LEDs d2. Output for the load. The rectifier circuit Lu 12 includes a bridge rectifier Ds and a capacitor C, and the buck converter 14 includes a transistor component, a pulse width module 16, a flywheel diode D, and an inductor L! A capacitor <: 2. The signal function is an AC power source as an input signal, the AC power source is converted into a chopping signal via a rectifying circuit, and the pulse width module 16 controls the transistor Q and a duty cycle. When the transistor Q] is turned on, the chopping signal charges the inductor ^ and the capacitor C2, and the energy stored by the chopping signal and the inductor Li and the capacitor C2 drives the light-emitting diode A; at the time of the transistor Q, when it is turned off The current released by the inductor Li and the capacitor C2, the light-emitting diode D2 and the flywheel diode Di form a loop to provide the light-emitting diode light-emitting D2. • However, when the AC power supply is switched between positive and negative power, the AC input chopping cannot be effectively suppressed, causing the input chopping provided by the rectifying circuit to be interrupted, and it is impossible to increase the amount of light. Η面训陈极幽 = Electric # must be Otani Dong capacitor impedance, this limitation also causes the drive circuit volume can not be reduced, in addition, - this drive circuit has a low size, so many kinds of _ can not meet the market requirements. The present invention is directed to the problems of the above-mentioned prior art, and the LED driving circuit architecture is changed to effectively solve the problems existing in the prior art. [New Content] 5 M357021 The main purpose of this creation is to provide a light-emitting diode driving circuit, which changes the internal circuit structure to reduce the negative voltage, solves the phenomenon of flashing LEDs, and improves the conversion efficiency. . The other purpose of this creation is to provide a light-emitting diode drive circuit that does not require a large-capacity capacitor to reduce the space occupied by the LED drive circuit. In order to achieve the above objectives, the present invention provides a light-emitting diode driving circuit, which includes an AC power supply, a rectifying circuit, and a switch opening. ^, a switching element, a pulse width module, and a rectifying diode Body, a storage inductor, an output capacitor, and a warehouse lane Thunder ^, private 丄 贞 battle circuit. Wherein, the rectifier circuit comprises a bridge rectifier connected in parallel
輸入電今’開關凡件連結第一節點；儲能電感跨接於開關元件與第二節點； 脈衝寬度模組包含有輸人端、驅動端、_端與接地端，其驅動端係與開關元 件連接，輸入端與第-節點連接；輸出電容跨接於第二節點與脈衝寬度模組之 接地端’整〃—極體跨接賴關元件之後與脈衝寬度齡之接地端丨貞載電路 己S複數個發光—極體與—控流電阻_聯；其巾脈衝寬賴組之鶴端連接在 發光二極體控流電阻之間。 本創作藉由改變縣電路結構的連結關係，使原本義輪二極體增添了整 版的功月t* T降轉電壓電流為負的電壓電流，因此，於輸入漣波中斷時，仍可 由一獨立跨壓提供發光二極體發光。 底下藉由具體實施例配合所附的圖式詳加說明，當更容易瞭解本發明之目 的、技術内容、特點及其所達成之功效。 【實施方式】 第-圖與第二圖分別為本創作之實施例與其實作電路圖，本創作提供一種 發光-極體驅動鱗2〇,其係包括_交流電源U流電路I —開關元件 3〇、-脈衝寬度模組26、-整流二極體32、—儲能電感34…輸出電容％以 6 M357021 及-貞載電路24 ’其巾’整流電路係由—橋式整M &與—輸人電容q並聯 組成，且連結於第-節點Nl與第二節點N2輸出，該橋式整流器〇6係由兩組二 個同向串接二極體相對並聯而成，其順向連結於該第—節點N，逆向連結於該 第二節點n2 ;此脈衝寬度模組26包含一輸入端26卜—驅動端姬、一回授端 263與-接地端264，其輸入端261連結整流電路之第—節點&，其驅動端泥 係連接於開關元件_〇’其接地端261係連結於負載電路24輸出；儲能電感 _ (L2)34跨接於開關元件(q2)30與整流電路之第二節·點& ;輸出電容似％跨接 鲁.於整流電路之第二節點N2與脈衝寬度模組之接地端261 ;整流二極體(1>3)32跨 接於開關元件(Q2)30與脈衝寬度模組之接地端261 ;負載電路24係由至少一個 發光-極體D4與-控流電阻&串聯所組成，並且脈衝寬度模組之回授端2幻 連結於發光二極體D4與控流電阻r2間之節點。 此發光二極體驅動迴路2〇係將交流電源28輸入電壓由橋式整流器〇6與輸 入電谷C3轉為電壓電流，此電壓電流係以輸入漣波（47Hz 63Hz)形式傳遞能 源訊號。而脈衝寬度模組26控制一開關元件(Q2)30 ,此開關元件(q2)3()係可為 隹—電晶體元件’其導通截止決定此電壓電流是否對耦接的一儲能電感(L2)34與一 輸出電容(Q)36進行充電，並利用一整流二極體(D3)32將原本正的電壓電流訊號 轉為負的電壓電流輸出，其提供該發光二極體發光〇4。 其中，於電晶體元件(Q2)3〇導通時’電壓電流對儲能電感(L2)34與輸出電容 • (<：4)36充電並且提供發光二極體D4之驅動電壓；於電晶體元件(q2)3〇戴止時， 係由輸出電容(Q)36之儲能提供驅動電壓，使發光二極體〇4發光。 在實際電路作用的情況下，可能因為輸入漣波無法有效抑制，使得漣波發 生間斷’因此雖然在電晶體元件(q2)3〇導通時，其迴路也可能會發生無任何電 7 M357021 愿電流輸入於後段電路的突發狀況，導致第一節點N,與第二節點&其_ 零。由於本_將《錢、_—整紅極師挪轉為㈣賴電流，所 以，於負«路兩端的跨壓與整流電路之跨壓係為獨立，因此在此種連波間斷 的情況下’係以另一跨壓驅動私夯-搞辦旅止η 私狐光—極It發先d4 ’以防止電源訊號不連續所導 致發光二極體D4閃爍的狀況產生。 以上所述之實施例僅係為說明本創作的技術思想及特點，其目的在使熟習 此項技藝之人士能夠瞭解本創作之内容並據以實施，當不能以之限定本創作之 卜專利範圍，社驗本創作所揭权精神所狀鱗變化或修飾，仍應涵蓋在 本創作之專利範圍内。 【圖式簡單說明】 第一圖係為習知發光二極體驅動電路。 第二圖係為本創作之實施例電路方塊圖。 第三圖係為本創作之詳細電路示意圖。 【主要元件符號說明】 10 發光二極體驅動電路 12 整流電路 14 降壓式轉換器 16 脈衝寬度模組 20 發光二極體驅動迴路 22 整流電路 24 負載電路 26 脈衝寬度模組 28 交流電源 261 輸入端 262 驅動端 263 回授端 264 接地端 30 電晶體元件 32 整流二極體 34 儲能電感 8 M357021 36 輸出電容 C3 輸入電容 d6 橋式整流器 N, 第一節點 n2 第二節點 Di 飛輪二極體 L, 電感 c2 電容 d2 1 發光二極體 d5 橋式整流器 c, 電容 Qi 電晶體元件The input current switch is connected to the first node; the energy storage inductor is connected to the switch element and the second node; the pulse width module includes the input end, the drive end, the _ end and the ground end, and the drive end system and the switch The component is connected, and the input end is connected to the first node; the output capacitor is connected to the grounding end of the second node and the pulse width module, and the whole end of the pulse body is connected to the ground end of the pulse width A plurality of illuminating-polar bodies and current-control resistors are connected; the crane end of the towel pulse-width group is connected between the light-emitting diode control resistors. By changing the connection relationship of the county circuit structure, the original version of the original wheel diode adds a full version of the power month t* T to reduce the voltage and current to a negative voltage and current. Therefore, when the input chopping is interrupted, it can still be A separate cross-voltage provides illumination of the LED. The details, technical contents, features, and effects achieved by the present invention will become more apparent from the detailed description of the embodiments and the accompanying drawings. [Embodiment] The first diagram and the second diagram are respectively an embodiment of the creation and a circuit diagram of the actual creation. The present invention provides a luminous-polar body driving scale 2, which includes an _AC power supply U-flow circuit I-switching element 3 〇, - pulse width module 26, - rectifier diode 32, - energy storage inductor 34 ... output capacitance % with 6 M357021 and - load circuit 24 'the towel 'rectifier circuit is - bridge type M & The input capacitors q are formed in parallel, and are connected to the output of the first node N1 and the second node N2. The bridge rectifier 〇6 is formed by two sets of two parallel-connected diodes connected in parallel, and the forward connection is performed. The first node N2 is inversely connected to the second node n2; the pulse width module 26 includes an input terminal 26-drive terminal, a feedback terminal 263 and a ground terminal 264, and the input terminal 261 is connected and rectified. The first node of the circuit is connected to the switching element _〇', the grounding end 261 is connected to the output of the load circuit 24; the energy storage inductor _ (L2) 34 is connected across the switching element (q2) 30 and The second section of the rectifier circuit · point & output capacitance like % crossover Lu. In the second section of the rectifier circuit N2 and the grounding end 261 of the pulse width module; the rectifying diode (1 > 3) 32 is connected across the switching element (Q2) 30 and the grounding end 261 of the pulse width module; the load circuit 24 is composed of at least one illuminating-pole The body D4 is composed of a - control current resistor and a series connection, and the feedback end of the pulse width module is magically connected to a node between the light-emitting diode D4 and the current-control resistor r2. The LED driving circuit 2 converts the input voltage of the AC power source 28 from the bridge rectifier 〇6 and the input battery C3 to a voltage current, which transmits the energy signal in the form of input chopping (47 Hz 63 Hz). The pulse width module 26 controls a switching element (Q2) 30, which can be a 隹-transistor element whose on-off determines whether the voltage current is coupled to a storage inductor ( L2) 34 is charged with an output capacitor (Q) 36, and a rectified diode (D3) 32 is used to convert the original positive voltage current signal into a negative voltage current output, which provides the LED illuminator 4 . Wherein, when the transistor element (Q2) is turned on, the voltage current charges the storage inductor (L2) 34 and the output capacitor (<: 4) 36 and provides the driving voltage of the light-emitting diode D4; When the component (q2) is turned on, the driving voltage is supplied from the energy storage of the output capacitor (Q) 36 to cause the light-emitting diode 〇4 to emit light. In the case of the actual circuit action, the input chopping cannot be effectively suppressed, so that the chopping wave is interrupted'. Therefore, although the transistor element (q2)3 turns on, its circuit may also have no electricity. 7 M357021 The burst condition input to the back-end circuit causes the first node N to be _zero with the second node & Because this _ will "money, _ - the whole red priest shift to (four) lag current, so the cross-pressure at the negative ends of the road and the cross-voltage system of the rectifier circuit are independent, so in the case of such continuous wave discontinuity 'The system is driven by another cross-pressure--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- The embodiments described above are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement them according to the scope of the patent. The changes or modifications of the scales of the spirit of the essays of the Society shall remain covered by the scope of this creation. [Simple description of the drawing] The first figure is a conventional LED driving circuit. The second figure is a circuit block diagram of an embodiment of the present invention. The third picture is a detailed circuit diagram of the creation. [Main component symbol description] 10 LED driver circuit 12 Rectifier circuit 14 Buck converter 16 Pulse width module 20 LED drive circuit 22 Rectifier circuit 24 Load circuit 26 Pulse width module 28 AC power supply 261 Input Terminal 262 Drive 263 Feedback Terminal 264 Ground Terminal 30 Transistor Element 32 Rectifier Diode 34 Energy Storage Inductor 8 M357021 36 Output Capacitor C3 Input Capacitor d6 Bridge Rectifier N, First Node n2 Second Node Di Flywheel Dipole L, inductor c2 capacitor d2 1 light-emitting diode d5 bridge rectifier c, capacitor Qi transistor component