1307253 九、發明說明： _ 【發明所屬之技術領域】 ' 树明刺於—種冷陰極管的平衡電路，特別是—種可以針 ' 對_器之二次側線圈進行電流平衡的冷陰極管之平衡電路。 【先前技術】 在液晶顯示器（LCD)中，使用螢光冷陰極管（CCFL，Cold Cath〇deFlu_entLamp)作為背光模組（加琴⑽ 光源’並且藉由換流器（Inverter)的驅動電路來驅動。由於液晶 顯示器面板的尺寸不斷增大，使得單一的CCFL冷陰極管已益法 触適當的亮度，因而f要兩個或者更多的ccfl冷陰極 官。在使用多個冷陰極管的液晶顯示器面板上，為了確保液晶顯 示器面板的亮度均勻時，需隨時調節流經每一根ccfl冷陰極管 的電流’以使流經每-根CCFL冷陰極管的電流量相等。然而， 每-根CCFL冷陰極管的寄生參數（寄生電阻或寄生電容）不同， ♦ 所以很難維持每-根CCFL冷陰極管的阻抗性一致，而每一根 CCFL冷陰極官的阻抗性不一致時，會導致流經每一個冷陰極管 的電流不同，進而使得每一個冷陰極管擁有不同的亮度。 戶斤以，如何提供-種平衡每一根冷陰極管電流的機制，以維 • 持流經每-根冷管大體鱗或㈣每—根冷陰極#的電流， 從而在液晶顯示器面板上產生預期的照明效果，同時減少電子栌 制和電源轉換設備，以達到系統成本的減少，將是目前迫於解決 的問題。目前的設計，集中在驅動電路型態的改變，由驅動電路 5 1307253 中平衡不同冷陰極管的管電流，例如中華民國專利㈣綱。但 是這種設計每次魏平衡—對冷陰極管，抑社關冷陰極管 之間仍存在管電流不平衡的問題。針對上述平衡電路，美國專利 公開案U. S JG5_3471及U. S. 2005_3472則是利用單一封閉 鹏，同時平衡所有冷陰極管之電流，此種電路中，所有冷陰極 管都接在同-變壓器的二次側，如果冷陰極管數量增加，變壓器 的負載也會跟著提升，必縣用高㈣的變壓器才能達成。又。 絲陰極管之低壓端採取互相連結而不接地的電路設計，冷陰極 管之低壓端也無法取得管電流進行_控制，使得f電流的即時 調控較為困難。 【發明内容】 ，係由單一變壓器同時驅動多個冷陰極管，造成 冷陰極管触，或是變_同_動過多冷陰極管而造 成負載過高的問題。鑒於以上的問題，本發明提供一種冷陰極管 之平衡电路係針對驅動冷陰極管之變壓器進行平衡，使變壓器 Z二二進而平衡各變壓器所驅動之冷陰極管的管電流二 使各~陰極官之亮度趨向一致。 對了達成上述目的，本發明提供_種冷陰極管之平衡電路， =個1側線圈、複數個二次側線圈及複數個;衡線 應於一次側線圈其中之—，並分別與其所對 、中產生磁力線感應，用以將電源之電壓轉換為 1307253 :驅動冷陰極管之，冷陰極管係串聯 刀卿狀认側線圏其中之一，並分別與其所驗 則線圈其中產生磁力線感應，且各變壓器之 :7人 -封閉回路’藉以平衡各—次側線圈，以使連接於=成 冷陰極管的管電流平衡，以獲得-致的亮度。、線圈之 本發明之功效在於，軸由魏器之— 使管電流之平衡在變壓糾相進仃平衡， 下，要直接增加變壓器的數目，使 := 即可使多個冷陰極管都具備相同的管電流 2負載二變壓器所驅動的冷陰極管進行平衡，造成電 “負載細妓Μ增加冷陰極量的_。 成電 内容足以使任何熟習相關技蔹及U其 施，且根據本說明書所揭露並據以實 熟習相關技藝師易地·纽％專利顺圖式’任何 【實施方式】 相關之目的及優點。 ，參閱「第i圖」所示，係為本發明第一實施 陰極官之平衡電路的電路圖， 〜 個冷陰極管200。 抑100及複數 作變實施例僅以二個變壓器igg進行說明教述， 目，每-個了依據4设置所需的數 U00係用以驅動—或複數個冷 1307253 本實施例中，每—個變壓器⑽係用以驅動-u型之冷陰極管 200。二變壓器100以並聯方式連接於一電源S1，用以接收一電 輕入以轉換電壓。各變壓器分別具有-個-次侧線圈110、 i二次側線圈120及—個平衡線圈13G，其中一次侧線圈⑽ 係與電源S1連接’且與二次側線圈m產生磁力線感應，以將電 源幻之電壓轉換為可驅動冷陰極管勘之電壓，由二次側線圈 120輪出。其中各變壓器⑽之—次側線圈1K)的繞顧數相同， 且錢愿器勘之二次側線圈120也具有相同繞線隨’以使各 •憂壓器100具備相近之電氣特性。 各冷陰極管200係分別與其所對應之變壓器1〇〇連接，且中 冷陰極管200之二端係分別連接於二次側線圈⑽之二端，使A 陰極管200與二次側線圈12〇以串聯方式連接。 7 、，各'龍器之平衡線圈130係互相串聯形成-封閉回路， 、人側線圈no產生磁力線感應’對一次侧線圈進行平 2 ^以使各-次側線圈110所驅動的冷陰極管具備相同的 s電/巩，而達成一致的發光亮度。 本發明峨請之-次側線請進行平衡，藉以改變 各器100之二次側線請之輸出，而使編 之冷陰極管的管電流—致，以使其亮度趨向—致，此= 配線簡單，又可直接將平衡線圈⑽整合於變㈣11G中，用二 簡化整體線路佈局。 此外，於本#施例中更包含有14G及—回授線圈 1307253 MG係與各變壓請之平_⑽串聯形 力绫^ 糟由各平衡線圈130與一次側線圏110產生的磁 力生線=可形成一電流通過偵測線圈•侧 而與回授線圈3°°互減應。透過-回授電路由 管的亮電源S1之輪出’而讓各冷陰極 b閱第2圖」所示，係為本發明第二實關之冷陰極管 =衡^路心路圖。係為本發明第—實施例所提供之冷陰極管之 ^衡书路^電路圖’其包含有複數個變壓器勘及複數個冷陰極 Y 士第—Μ細例與第一實施例最大不同處在各變壓器1〇〇係 同時驅動：個冷陰極管· ’其中各冷陰極管之紐端係分 12G之二端’而二冷陰極管之低壓端則 互相連接’藉以構成—串聯回路，使二冷陰極管之管電流皆 5同τ不同變壓盗100所驅動之冷陰極管2〇〇，亦將低壓端 連接在-起而不接地。第二實施例其餘部分與第—實施例相同， 係將各^壓器1〇〇中的平衡線圈串聯，透過平衡線圈平 ，各灸£器1GQ之—次侧線圈的輸出ϋ貞測線圈⑽與平 衡Λ圈130串耳外’透過回授線圈彻進行磁力線感應、，則解決了 ~陰極官2GGI11林接地而無法直接轉賴赠％及電流回授 Is的問題。 1307253 本發明之冷陰極管之平衡獅，主要是將互相串聯之平衡線 圈130，整合於變壓器100中，針對變壓器、100之-次側線圈110 進行物，藉以使不同的變壓$ 100所驅動之冷陰極管具備 相同之s包机。因此官電流之平衡係由在變壓器内部完成， 在需要增加冷陰極管200的場合下，口盈古 卜^要直接增加變壓器100的 數目，使每個變壓器⑽中的平衡線圈130互相串聯，即可使不 同的變Μ器100所驅動的冷陰極瞢 都具備相同的管電流。解 决了習知技術中，只能針罝一綠网σ 迕成雷6 m山 動的冷陰極管進行平衡， 成電^負載柄或是不糾加冷陰極管數量的問題。 雖然本發明以前述之實 發明。太z盼祕士於 …、其亚非用以限定本 毛月在不麟本發明之精神和 屬本發明之專斤為之更動與潤飾，均 同4¾狀利保4補。關於本發 所附之申請專利範圍。 呆蠖範圍請參考 【圖式簡單說明】 第1圖係為本發明提供冷陰極管之〃 路圖；以及 衡电路之弟一實施例電 第2關林剌雜雜極f之平 路圖。 <弟二實施例電 【主要元件符號說明】 100 200 S1 變壓器 冷陰極管 電源 10 1307253 110 120 130 m 140 200 3001307253 IX. Description of invention: _ [Technical field of invention] 'Shuming spurs the balance circuit of cold cathode tube, especially the cold cathode tube which can balance the current of the secondary side coil of _ Balance circuit. [Prior Art] In a liquid crystal display (LCD), a fluorescent cold cathode tube (CCFL, Cold Cath〇 deFlu_ent Lamp) is used as a backlight module (a violin (10) light source' and driven by a driver circuit of an inverter (Inverter) Due to the increasing size of the liquid crystal display panel, a single CCFL cold cathode tube has been adapted to the appropriate brightness, so two or more ccfl cold cathodes are required. In the liquid crystal display using multiple cold cathode tubes On the panel, in order to ensure uniform brightness of the liquid crystal display panel, it is necessary to adjust the current flowing through each ccfl cold cathode tube at any time to make the amount of current flowing through each CCFL cold cathode tube equal. However, per-root CCFL The parasitic parameters (parasitic resistance or parasitic capacitance) of the cold cathode tube are different, ♦ it is difficult to maintain the uniformity of the impedance of each CCFL cold cathode tube, and the impedance of each CCFL cold cathode is inconsistent, resulting in flow through The current of each cold cathode tube is different, so that each cold cathode tube has different brightness. How to provide a mechanism for balancing the current of each cold cathode tube To maintain the desired illumination effect on the LCD panel by reducing the current flowing through each of the cold tubes or (4) each of the cold cathodes, while reducing the electronic clamping and power conversion equipment to achieve system cost. The reduction will be the problem that is currently being solved. The current design focuses on the change of the drive circuit type, and the tube current of different cold cathode tubes is balanced by the drive circuit 5 1307253, such as the patent of the Republic of China (4). Designing each Wei balance—There is still a problem of tube current imbalance between the cold cathode tube and the Shuguan cold cathode tube. For the above balanced circuit, US Patent Publications U. S JG5_3471 and US 2005_3472 use a single closed Peng At the same time, balance the current of all cold cathode tubes. In this circuit, all the cold cathode tubes are connected to the secondary side of the same-transformer. If the number of cold cathode tubes increases, the load of the transformer will also increase, and the county will use high (4). The transformer can only be achieved. The low-voltage end of the wire cathode tube is designed to be connected to each other without grounding, and the low-voltage end of the cold cathode tube cannot be It is difficult to control the current of the f current, which makes it difficult to control the current of the f current. [Summary] A plurality of cold cathode tubes are driven simultaneously by a single transformer, causing cold cathode tube contact, or changing the same cold cathode tube. In view of the above problems, the present invention provides a balanced circuit for a cold cathode tube that balances a transformer that drives a cold cathode tube, so that the transformer Z 2 and then balance the cold cathode tubes driven by the transformers. The tube current 2 makes the brightness of each cathode cathode tend to be uniform. To achieve the above object, the present invention provides a balancing circuit for a cold cathode tube, a 1-side coil, a plurality of secondary coils, and a plurality of; In the primary side coil, and respectively, the magnetic line is generated in response to the pair, and the voltage of the power source is converted into 1307253: the cold cathode tube is driven, and the cold cathode tube is connected to the side line. And respectively, the magnetic coils are generated in the coils, and the transformers: 7-closed loops are used to balance the respective-secondary coils so that the connection is Cold-cathode tube current balance tube, to obtain - consistent brightness. The effect of the invention of the coil is that the shaft is made up of the Wei instrument - the balance of the tube current is balanced in the pressure transformation phase, and the number of transformers is directly increased, so that: = can make multiple cold cathode tubes The same cold cathode tube with the same tube current 2 load and two transformers is balanced, causing the electric "load fine to increase the cold cathode amount _. The power content is enough to make any familiar technology and U, and according to this The related art and related advantages of the present invention are disclosed in the specification, and the related objects and advantages of the present invention are shown in the "i-th diagram", which is the cathode of the first embodiment of the present invention. The circuit diagram of the balance circuit of the official, ~ cold cathode tube 200. 100 and the plural embodiment are described by only two transformers igg. For each purpose, the number U00 required for setting according to 4 is used to drive - or a plurality of cold 1307253. In this embodiment, each - The transformer (10) is used to drive the -u type cold cathode tube 200. The second transformer 100 is connected in parallel to a power source S1 for receiving a light input voltage to convert the voltage. Each of the transformers has a - secondary side coil 110, an i secondary side coil 120, and a balancing coil 13G, wherein the primary side coil (10) is connected to the power source S1 and magnetic line sensing is generated with the secondary side coil m to power the power source. The phantom voltage is converted to a voltage that can drive the cold cathode tube and is rotated by the secondary side coil 120. The number of turns of the transformer (10) to the secondary side coil 1K is the same, and the secondary side coil 120 of the wisher has the same winding direction so that each of the pressure gauges 100 has similar electrical characteristics. Each of the cold cathode tubes 200 is connected to its corresponding transformer 1〇〇, and the two ends of the intermediate cold cathode tube 200 are respectively connected to the two ends of the secondary side coil (10), so that the A cathode tube 200 and the secondary side coil 12 are connected.连接 Connect in series. 7. The balance coils 130 of each of the dragons are connected in series to each other to form a closed loop, and the human side coils no magnetic field line sense 'the primary side coil is flat 2 ^ so that the cold cathode tubes driven by the respective secondary coils 110 Have the same s electric / Gong, and achieve a consistent brightness. According to the present invention, the balance of the secondary side line should be balanced, so as to change the output of the secondary side line of each device 100, so that the tube current of the cold cathode tube is matched so that the brightness thereof tends to be such that the wiring is simple. In addition, the balance coil (10) can be directly integrated into the variable (four) 11G, and the overall circuit layout is simplified by two. In addition, in this embodiment, the 14G and the feedback coil 1307253 MG system and each of the transformers are flat _(10) series force 绫^ The magnetic force generated by each balance coil 130 and the primary side coil 110 = can form a current through the detection coil side and the feedback coil 3 ° ° mutual subtraction should be. The transmission-light feedback circuit is turned on by the bright power supply S1 of the tube, and the cold cathodes b are shown in Fig. 2, which is the second embodiment of the present invention. The circuit diagram of the cold cathode tube provided in the first embodiment of the present invention includes a plurality of transformers and a plurality of cold cathodes. The maximum difference between the first embodiment and the first embodiment is Each transformer 1 is driven at the same time: one cold cathode tube · 'the cold end of each cold cathode tube is divided into two ends of 12G' and the low voltage ends of the second cold cathode tube are connected to each other to form a series circuit, so that The tube current of the cold cathode tube is 5 and the cold cathode tube 2 driven by the different pressure thief 100 is also connected, and the low voltage end is also connected to the ground without being grounded. The rest of the second embodiment is the same as the first embodiment, in which the balance coils in each of the pressure devices 1 are connected in series, and the balance coils are passed through, and the output coils of the 1GQ-secondary coils of each moxibustion device are (10). With the balance of the Λ 130 130 耳 耳 耳 耳 耳 耳 穿 穿 穿 穿 穿 穿 穿 穿 穿 穿 穿 穿 穿 穿 穿 穿 穿 穿 穿 穿 穿 穿 穿 穿 穿 穿 穿 穿 穿 穿 穿 穿 穿 穿 穿 穿 穿1307253 The balance lion of the cold cathode tube of the present invention mainly integrates the balance coils 130 connected in series with each other in the transformer 100, and carries on the transformer, the 100-second-side coil 110, so as to drive different voltages of $100. The cold cathode tube has the same s charter. Therefore, the balance of the official current is completed inside the transformer. In the case where the cold cathode tube 200 needs to be added, the number of the transformers 100 is directly increased, so that the balance coils 130 in each transformer (10) are connected in series with each other, that is, The cold cathodes driven by the different converters 100 can have the same tube current. In the conventional technology, it is only possible to balance the cold cathode tube of the green grid σ 迕 into the 6 m mountain, and to increase the number of cold cathode tubes. Although the invention is based on the foregoing invention. Too z hopes that the culprit in ..., its Asian and African use to limit the hair of the present invention in the spirit of the invention and the jin of the invention for the change and retouching, are the same as the 43⁄4 shape warranty 4 supplement. The scope of the patent application attached to this document. For the scope of staying, please refer to [Simplified description of the drawings] Fig. 1 is a road diagram of a cold cathode tube according to the present invention; and a circuit diagram of a second embodiment of the circuit of the balance circuit. <Different Embodiments Electricity [Description of Main Components] 100 200 S1 Transformer Cold Cathode Tube Power Supply 10 1307253 110 120 130 m 140 200 300
Vs 參 Is 一次侧線圈 二次側線圈 平衡線圈 偵測線圈 冷陰極管 回授線圈 電流回授 電壓回授 11Vs reference Is primary side coil secondary side coil balance coil detection coil cold cathode tube feedback coil current feedback voltage feedback 11