200905632 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種電壓箝制與能量回收電路，特別是有關於 一種箝制輸出電壓及回收電壓突波之電路。 【先前技術】200905632 IX. Description of the Invention: [Technical Field] The present invention relates to a voltage clamping and energy recovery circuit, and more particularly to a circuit for clamping an output voltage and recovering a voltage surge. [Prior Art]
目前’隨著科技發展’顯示器大量地被應用在曰常生活中，尤 其以液晶顯示器之應用為最。由於液晶顯示器為非自發性發光之顯 示器，故必須藉助背光模組所提供之光源才能達到顯示的功用。目 前業界普遍利用冷陰極螢光燈(c〇ld cath〇de fluOTeseent lamp， CCFL)作為背光模組之發光源，另一種常見的背光模組之發光源為 發光二極體(Light Emitting Diodes，LED)陣列。其中，發光二極 體陣列較冷陰極螢光燈優異之處如下： X 1. 反應速度快； 2. 壽命較長； 3. 不需焉壓點燈； 4. 不含汞，無環境污染之疑慮；以及 5. 色彩範圍較廣。 因此，雖然許多廠商致力於研發含汞量低及色彩範圍寬廣之Ccfl，然 而LED的反應速度較快仍是CCFL所望塵莫及之優點。 現今較為新穎的兩種顯示技術，一為區域控制法(Area c〇ntr〇1 or Regional Control)，二為色序法（Col〇r Sequential Wsplay， CSD)。但是上述兩種技術均需搭配反應速度較快之背光源，因此使用 LED作為背光源已是未來發展之趨勢。以下分別簡介上述兩種顯示技 200905632 1區域控制法： 在傳統的顯示技術中，背光燈的亮度均一致，因此畫面亮暗的程 度取決於液晶分子之旋轉角度所控制的透光度。而區域控制法是將晝 面切割為數個區域，並依照其各自的亮暗程度改變背光燈之亮度，此 舉可大幅提升液晶面板之亮暗對比，且同時降低背光燈所消耗之功 率。當採用區域控制法時’背光燈之響應速度必須儘可能的快速以縮 短暫態時間’進而增加亮度控制之準確度’因此需要使用反應速度較 快之LED以作為背光模組。 2.色序法： 在傳統的LCD顯示技術中，背光燈所提供之白光經由彩色濾光片 還原成紅、綠、藍三原光。彩色濾光片的成本約佔背光模組的， 但其光利用率（Light Utilization Efficiency，LUE)約只有 37%。因 此，使用其他方法取代彩色濾光片可以大幅降低LCD之成本與功率損 耗。在色序法顯示技術中，紅、綠、藍三色背光燈依序發光，且快速 地轉換以利用加法混色原理來提供任意有色光，因此不需要彩色濾光 片。然而上述作法的先決條件是，紅、綠、藍三色背光燈必須具備快 速轉換的能力，因此使用反應速度較快之LED也是必然之趨勢。 當=用LED t光燈進行區域控制&時，首先需要個別控制各區域 之LED背光燈。最直接的方法就是增加驅動器的數量，用某一驅動器 ，應某-區域以點亮此區域之LED串列，即可精確地控制各區域的亮 二。然而此舉將大幅增加系統之體積、重量及成本。請參照第一圖， ί2 =知^白光謝車列區域控制系統電路圖，其包含一個橋式 二ί /古⑽個具功率因素修正功能之直流/直流轉換器120、一 換器130及一負载200。其中，該負载為一劃分為Α ^(^^(^區娜糾區撕的圆莫組’且各⑽串列皆 200905632 各自麵接至-具開關功能之穩流電路 系統2:iS=:性：第-圖之⑽背光燈驅動 責任比(DUty她你二:^^^控制’藉由改變·^ 穩流電路SA，之導通^任^度二=，为別控制各個具開關功能的 意圖如第二_示=壬3比^卿各_的亮度。其示 的LE^ id二t 210的LED之導通時間為2/4麵，B區220 D ^ 240 ^ i/^30 ^ LED 3/4fBM > 小關係為B區>^ΑΪ>為/區娜因此各議背光燈亮度之大 電路^參SC圖=圖所示為習知之色序LED陣列區域控制系統 同，其不同處Li區燈區域控制驅動系統大致相 m 〇 '月先燈均具備紅、綠、藍光LE1D陣列各一串， =負=可劃分為A謂、B區·、c議與二二 岸2陵 列模組。請參照第四圖，第四圖所示為習知之色 有紅光控Γί統之驅動電流波形圖’前1/3醒的時間内只 作原理盥上、十、ώ丄刀成且每一種顏色之LED背光燈的動 盡相同，因此必須儘可能的降低輸出電容Co的 t值/輸出電壓可快速切換至三種顏色之LED的驅動電壓。另一 3 串LED陣列發生短路故障時，較小的輸出電容Co能避 n夕、月b里灌人LED P車列之中，目而達到短路保護之功效。 然而’在—個工作週期中，總負載電流1〇只會降低而不會升高， 200905632 較小之輸出電容Go在負載下降的暫態反應時，無法穩定輸出電壓At present, 'with the development of technology' displays are widely used in ordinary life, especially in the application of liquid crystal displays. Since the liquid crystal display is a non-spontaneous light emitting display, the light source provided by the backlight module must be used to achieve the display function. Currently, cold cathode fluorescent lamps (CCFLs) are widely used as illumination sources for backlight modules. Another common backlight module is a light emitting diode (Light Emitting Diodes, LED). ) array. Among them, the LED array is superior to the cold cathode fluorescent lamp as follows: X 1. Fast reaction speed; 2. Long life; 3. No need to press light; 4. Mercury free, no environmental pollution Doubt; and 5. A wide range of colors. Therefore, although many manufacturers are committed to the development of Ccfl with low mercury content and a wide range of colors, the faster response of LEDs is still an advantage that CCFL is not able to achieve. Nowadays, two new display technologies, one is Area c〇ntr〇1 or Regional Control, and the other is Col〇r Sequential Wsplay (CSD). However, both of these technologies need to be matched with a faster response backlight, so the use of LED as a backlight is a trend in the future. The following two display technologies are respectively introduced: 200905632 1 Area Control Method: In the conventional display technology, the brightness of the backlights is uniform, so the degree of brightness of the screen depends on the transmittance controlled by the rotation angle of the liquid crystal molecules. The area control method cuts the surface into several areas and changes the brightness of the backlight according to their respective brightness and darkness. This can greatly improve the contrast of the liquid crystal panel and reduce the power consumed by the backlight. When the area control method is used, the response speed of the backlight must be as fast as possible to reduce the transient state, which in turn increases the accuracy of the brightness control. Therefore, it is necessary to use an LED with a faster response speed as the backlight module. 2. Color sequence method: In the traditional LCD display technology, the white light provided by the backlight is reduced to red, green and blue by the color filter. The cost of color filters is about the backlight module, but its Light Utilization Efficiency (LUE) is only about 37%. Therefore, replacing the color filter with other methods can greatly reduce the cost and power consumption of the LCD. In the color sequential display technology, the red, green, and blue backlights sequentially emit light and are rapidly converted to provide any colored light by the additive color mixing principle, so that a color filter is not required. However, the prerequisite for the above method is that the red, green and blue backlights must have the ability to switch quickly, so the use of LEDs with faster response is also an inevitable trend. When = regional control & with LED t-lights, it is first necessary to individually control the LED backlights of each area. The most straightforward way is to increase the number of drives. With a certain driver, a certain area should be used to illuminate the LED series in this area to precisely control the brightness of each area. However, this will greatly increase the size, weight and cost of the system. Please refer to the first figure, ί2 = know ^ white light Xie train column area control system circuit diagram, which includes a bridge type / ί (10) DC / DC converter 120 with power factor correction function, a converter 130 and a load 200. Wherein, the load is a steady current circuit system 2: iS =: divided into Α ^ (^ ^ (^ 娜 纠 撕 撕 撕 撕 且 且 且 且 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 2009 056 056 2009 056 2009 056 056 056 056 2009 Sex: Figure (10) backlight drive responsibility ratio (DUty her two: ^^^ control 'by changing · ^ steady current circuit SA, the conduction ^ ^ ^ two =, in order to control each switch function The intention is as follows: the second _ shows = 壬 3 than the brightness of each _. The LE^ id two t 210 LED on time is 2 / 4 side, B area 220 D ^ 240 ^ i / ^ 30 ^ LED 3/4fBM > Small relationship is B area> ΑΪ 为 为 / 区 因此 因此 因此 因此 因此 因此 因此 因此 因此 因此 因此 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 背光 ^ ^ ^ = = = = = = = = = = = = The Li area lamp area control drive system is roughly the same as the m 〇 'month light has a string of red, green and blue LED LE1D arrays, = negative = can be divided into A, B, · c and two and two shores Column module. Please refer to the fourth picture. The fourth picture shows the driving color waveform of the conventional color with red light control. The first 1/3 wake up time is only used as the principle, ten, sickle LED backlights in each color The same is true, so the output voltage Co must be reduced as much as possible. The output voltage can be quickly switched to the driving voltage of the LEDs of the three colors. When the other three strings of LED arrays have a short-circuit fault, the smaller output capacitor Co can be avoided. n 夕, 月 b irrigating LED P trains, the purpose of the short-circuit protection effect. However, in a working cycle, the total load current 1 〇 will only decrease without rising, 200905632 smaller The output capacitor Go cannot stabilize the output voltage when the load is transiently reacted.
Vo，因而當輸出電壓V〇因負載下降而上升時，將導致LED之亮度亦 隨之上升。此現象將嚴重影響面板之亮度準確度，且減少led的壽 及可靠度。 有鑒於習知技藝之各項問題，為了能夠兼顧解決之，本發明 人基於多年研究開發與料實務經驗，提出—種電壓箝制與能量 回收電路，以作為改善上述缺點之實現方式與依據。 【發明内容】Vo, therefore, when the output voltage V〇 rises due to a drop in load, the brightness of the LED also rises. This phenomenon will seriously affect the brightness accuracy of the panel and reduce the life and reliability of the LED. In view of the problems of the prior art, the present inventors have proposed a voltage clamping and energy recovery circuit based on years of research and development and material practice experience, as an implementation and basis for improving the above disadvantages. [Summary of the Invention]
有4ά於此本發明之目的就是在提供一種[ED陣列驅動系 統’以穩定LED之驅動電壓且收電壓突波的能量。本發明之Lf：D 統包括：—整流器、—校正電路、—直流轉換器、若 干個負載早π與一電壓箝制與能量回收電路。 古^中’整流器接收一交流電源，且將其轉換成一直流電源。 經過校正電路後形成—校正直流電源並輸人直流轉換器 修μ轉難將校正紐電源的第-縣轉換為第二電壓，鈇 =到負？。負載可由多個負載單元所組成，且分別連接到直 二、4^ μί—負載單兀皆電性連接到—控制開關，並藉由控制 開關決疋此負載為通路或斷路。 辕施^述之電壓箝她能量回收電路的輸人端連接到直流 箝制^ j端，且其輸出端連接到直流轉換器之輸入端。電壓 芎電路將負載上所形成的電壓突波導引到直流轉換 益，以達職壓箝倾能量时之目的。 200905632 承上所述，因依本發明之LED陣列驅動系統，具有以下優點： (1) 大幅提升系統之效率與可靠度； (2) 大幅提昇面板之亮暗對比；以及 (3) 降低背光燈之消耗功率。 、茲為使貴審查委員對本發明之技術特徵及所達到之功效 更進一步之瞭解與認識，謹佐以較佳之實施例及配合詳細之說 如後。 【實施方式】 之付號標不來說明 以下將參照相關圖式，說明依本發明較佳實施例之電壓籍制與 能量回收_，為使便於理解，下述實施财之相同元件係以相^ 首先’請參考第五圖’第五圖係為本發明之LED陣列驅動系統 之功能方塊圖。其巾，電源供應電路⑽提供—輸出電壓至' 200，當負載2GG下降時，輸出電壓會暫態上升而產生—電壓突波。 此時，電壓箝制與能量回收電路300藉由吸收電壓突波的能量: 輸出電壓箝制在-定範_，__賴負載之功效。此 壓箝制與能f回收電路«所《之能量，_職 路100而達到能量回收之目的。 € 接下來，請參考第六®，第六_為本侧之電 回收電路之-色序LED陣列區域控制系統電路圖。其中源= 電路剛與負載200之工作原理與結構，為本技術領域中且有= 知識者所悉知’在此概不贅述。而龍箝制與能量回收電路_ 含-電源轉換器310、-二極體D1與—輸人電容器π電其中，電 200905632 !10可為一隔離型脚直流轉換器，但亦不以此為限。 ί愚V备C1之電容值大於電容器c〇，當直流轉換器130之輸出 =Vo超過預設之保護電壓值VC1時，輸出電流ι〇流經二極體 於入^认電容器Π中’因而使輸出電壓Vq下降。換句話說， 11C1透過二刚吸收輸出電壓V。之電歷突波，因而 1練在預設之偏_值vgi。此外，當輸出電壓 之保護電壓值VC1時，輸入電容器㈣其所儲存之能 轉換器310，電源轉換器310再將其所接收之能量饋入 直讀換器130之直流電壓端VDC，因而達到能量回收之功效。 為多例之負載端施，於本發明另一實施例中，亦可擴展 f多個=載早兀，以搭配區·制法而應用於Ν個區塊的區域控制 ^j詳細電路圖如第七圖所示，且操作原理與上述實 同，在此概不贅述。 絲祕β參考第八圖，第八圖係為本發日月—實施例以返馳式 ^現賴_與能量时電路之電顧。其巾，電源轉換器 為-返馳式直流/直流轉換器。由於電源轉換器⑽所處理 3率不高’因此採用返馳式直流/直流轉換器可為—基於成 交佳選擇。當LED驅動電壓V◦超過預設之保護電壓值VC1時， :fl兀件S1開始切換’將多餘的能量回收至直流電壓端就 換II 130之輸出電壓V。降回正常狀態，達輯壓箝制與效 平徒升之功效。 _最1 ’請再參考第九®，第九_為本發明—實施例以順向式 轉換器Λ現電壓Hf慎能量回收電路之電路圖。其巾，為了提升 路之可靠度與敎性，本實關採_向式轉換器實現電源轉換器 200905632 310。當負載驅動電壓VG超過預設之保護電壓值vc S1開始切換’將多餘的能量回收至直流電壓端v吏ς = 出電壓崎回正常雜，朗賴箝倾效率提升斋之輸 以上所述僅為舉例性’而非為限制性 精神與魏狀料修料變i縣發明之 請專利範財。 U變更’均應包含於後附之申 【圖式簡單說明】 。口：之白光陣列區域控制系統電路圖； 圖=¾知之白紐轉列區域控制系統之驅動電流波形 第3圖 第4圖 第5圖 第6圖 第7圖 第8圖 第9圖 係為習知之色序LED _區域控制系統電路圖； =為習知之色序胸車列區域控餘統之鶴電流波形 係為本發明之LED陣列驅動系統之功能方塊圖； 電祕做能量时電路之—色序㈣陣列 £域控制系統電路圖； f為本發明之賴卿與㈣回收電路之另-色序led 陣列區域控制系統電路圖； 實施_返料娜器實現碰箝制與能 里回收電路之電路圖；以及 另—實施例以順向式轉換器實現電壓箝制與 月bl回收電路之電路圖。 200905632 【主要元件符號說明】 100 :電源供應電路； 110 :整流器； 120 :校正電路； 130 :直流轉換器； 200 :負載； 210 :白光LED負載A區； 220 :白光LED負載B區； 230 :白光LED負載C區； 240 :白光LED負載D區； 250 :紅、綠、藍LED負載A區； 260 :紅、綠、藍LED負載B區； 270 :紅、綠、藍LED負載C區； 280 :紅、綠、藍LED負載D區； 300 :電壓箝制與能量回收電路；以及 310 :電源轉換器。 12The purpose of the present invention is to provide an [ED array driving system] for stabilizing the driving voltage of the LED and collecting the energy of the voltage surge. The Lf:D system of the present invention comprises: a rectifier, a correction circuit, a DC converter, and a load π and a voltage clamping and energy recovery circuit. The ancient 'rectifier' receives an AC power source and converts it to a DC power source. After the correction circuit is formed, the DC power supply is corrected and the DC converter is input. It is difficult to convert the first-county of the correction power supply to the second voltage, 鈇 = to negative? . The load may be composed of a plurality of load cells, and respectively connected to the direct two, 4^μί - the load unit is electrically connected to the control switch, and the load is used as a path or an open circuit by the control switch. The voltage clamp of her energy recovery circuit is connected to the DC clamp, and its output is connected to the input of the DC converter. The voltage 芎 circuit directs the voltage surge formed on the load to the DC conversion benefit for the purpose of the tilting energy of the service clamp. 200905632 According to the above description, the LED array driving system according to the present invention has the following advantages: (1) greatly improving the efficiency and reliability of the system; (2) greatly improving the contrast of the panel; and (3) reducing the backlight Power consumption. For a better understanding and understanding of the technical features and the efficacies of the present invention, the preferred embodiments and the detailed description are as follows. [Embodiment] The following description will be made with reference to the related drawings, and the voltage system and energy recovery according to the preferred embodiment of the present invention will be described. For ease of understanding, the following components are implemented in the same phase. ^ First, please refer to the fifth figure. The fifth figure is a functional block diagram of the LED array driving system of the present invention. The towel, the power supply circuit (10) provides - the output voltage to '200, when the load 2GG drops, the output voltage will rise transiently to generate a voltage surge. At this time, the voltage clamping and energy recovery circuit 300 absorbs the energy of the voltage surge: the output voltage is clamped to the effect of the constant _, __ _ load. This pressure clamp system can recover the energy of the circuit «the road, 100, and achieve the purpose of energy recovery. € Next, please refer to the sixth ®, sixth _ this side of the electric recovery circuit - color sequence LED array area control system circuit diagram. The source = circuit and the working principle and structure of the load 200 are known in the art and are known to the skilled person, and will not be described here. And the dragon clamp system and the energy recovery circuit _ include - power converter 310, - diode D1 and - input capacitor π electricity, electric 200905632 ! 10 can be an isolated foot DC converter, but not limited to this . The capacitance value of ί V V standby C1 is greater than the capacitor c 〇, when the output of the DC converter 130 = Vo exceeds the preset protection voltage value VC1, the output current ι 〇 flows through the diode in the capacitor Π The output voltage Vq is lowered. In other words, 11C1 absorbs the output voltage V through the second just. The electric history of the turbulence, and thus 1 practiced in the preset bias _ value vgi. In addition, when the protection voltage value VC1 of the output voltage is input, the input capacitor (4) stores the energy converter 310, and the power converter 310 feeds the received energy to the DC voltage terminal VDC of the direct-reader 130, thereby achieving The effect of energy recovery. In another embodiment of the present invention, in the other embodiment of the present invention, it is also possible to expand the f-number=load early 兀, and apply the area control method to the area control of the 区 block in the collocation area method. The seven figures are shown, and the principle of operation is the same as the above, and will not be repeated here. The silky secret β refers to the eighth figure, and the eighth figure is the day and month of the present invention—the embodiment is in the form of a flyback type and a power circuit. Its towel, power converter is a flyback DC/DC converter. Since the power converter (10) handles a low rate, the use of a flyback DC/DC converter can be based on a good choice. When the LED driving voltage V ◦ exceeds the preset protection voltage value VC1, the :F element S1 starts switching. The excess energy is recovered to the DC voltage terminal to change the output voltage V of the II 130. Return to the normal state, to achieve the effect of pressure clamping and effect. _Max 1 'Please refer to the ninth +1, ninth _ the present invention - the circuit diagram of the embodiment of the forward converter to generate the voltage Hf cautious energy recovery circuit. In order to improve the reliability and ambiguity of the road, the real-time power converter converts the power converter 200905632 310. When the load drive voltage VG exceeds the preset protection voltage value vc S1, the switch starts to 'recharge the excess energy to the DC voltage terminal v吏ς = the voltage is back to normal, and the Langley clamps the efficiency of the lift. For the sake of exemplification', not for the restrictive spirit and the Wei-like materials, the invention patents for the invention. U changes should be included in the attached application [Simplified description of the schema]. Port: White light array area control system circuit diagram; Figure = 3⁄4 knowing the white button transition area control system drive current waveform Figure 3 Figure 4 Figure 5 Figure 6 Figure 8 Figure 9 Figure 9 is a conventional Color sequence LED _ area control system circuit diagram; = for the known color sequence chest column area control system crane current waveform is the functional block diagram of the LED array drive system of the present invention; (4) Circuit diagram of the array domain control system; f is the circuit diagram of the other-color-sequence led array area control system of the Lai Qing and (4) recovery circuit of the invention; the implementation of the _ returning material to realize the circuit diagram of the clamp clamp and the energy recovery circuit; - Embodiments A circuit diagram of a voltage clamp and a monthly bl recovery circuit implemented as a forward converter. 200905632 [Description of main component symbols] 100: power supply circuit; 110: rectifier; 120: correction circuit; 130: DC converter; 200: load; 210: white LED load A area; 220: white LED load B area; 230: White LED load C area; 240: white LED load D area; 250: red, green, blue LED load A area; 260: red, green, blue LED load B area; 270: red, green, blue LED load C area; 280: Red, green, and blue LED load D zone; 300: voltage clamp and energy recovery circuit; and 310: power converter. 12