1343043 九、發明說明： 【發明所屬之技術領域】 -. 本發明係關於—種冷陰極管的平衡電路，特別是-種可以針 ·.對不直接進彳了接狀冷陰歸進行管電辭衡及回㈣測的冷陰 極管之平衡電路。 【先前技術】 # 在液晶顯示11 ( LCD)巾，使用冷陰極螢光冷陰極管（CCFL，1343043 IX. Description of the invention: [Technical field to which the invention pertains] - The present invention relates to a balanced circuit for a cold cathode tube, in particular, a needle can be used for tube charging without directly entering the cold cathode The balanced circuit of the cold cathode tube measured by the balance and back (four). [Prior Art] # In the LCD 11 (LCD) towel, use a cold cathode fluorescent cold cathode tube (CCFL,
Cold Cathode Fluorescent Lamp )作為背光模組（恥咖咖 μ〇·) 的光源’並且藉由換流器（lnverter)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冷陰極管已無 法提供適當的照明亮度，因確保而需要兩個或者更多的ccfl冷 陰極管。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7然 *，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—致，而每 -根CCFL冷陰極管的阻抗性不—鱗，會導致流經每—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哀产。 所以，如何提供-種平衡每—根冷陰極f電流⑽Z以維 持流經每-根冷陰姆大體相等或㈣每—根冷陰崎的電流， 從而在液晶顯示H面扳上產生職的朗效果，同時減少電子控 制和電源轉換設備，以達到纽成本的減少，將是目前适於解決 5 1343043 的問題。目前的設計’針在驅動電路型態的改變，由驅動電路 中平衡不同冷陰極管的管電流，例如中華民國專利TW57344i。但 是這種設計每次碰平衡-對冷陰極管’不_之間的冷陰極管 之間仍存在t電封平衡關題。針對上述平衡電路，美國專利 公開案U.S. 20_93471及U.S.2GG5_3472則是利用單一封閉 回路同時平_有冷陰㈣之電流，此種電財，所有冷陰極^ 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’必須採用高負載的變壓器才能達成。又。若 冷陰極管之健雜取互相連_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回授控制，使得管電流的即時調 控較為困難。 【發明内容】 習知平衡電路的财，不適合作為同時平衡多個冷陰極管之 管電流’同時對於不接地的冷陰極管，也無法進行喊偵測。繁 於以上的問題’本發明提供—種冷陰極管之平衡電路，用以平衡 複數根冷陰極管之電流，以使各冷陰極管之亮度趨向一致，同時 可憤測不接地之冷陰極管的麵及電流，赠知授控制之訊號。 對了達成上述目的，本發明所揭露一種冷陰極管之平衡電 路，其包含有-電源供應回路、複數個冷陰極管驅_路及一平 衡口路射电源供應回路具有一電源及複數個併聯之一次側線 圈’各:次側線_連接於電源，用以接收—電力輸人。複數個 冷陰極s,·動回路’分珊應於—摘_其巾之―，其令各冷 6 1343043 陰極官驅動回路包含有串聯之感應線圈、二個二次側線圈及二冷 陰極管。二次侧線圈分別與其所對應之一次側線圈產生磁力感 應’且各二次側線圈係分別連接於感應線圈之二端，而各冷陰極 管之低壓端係互相連接，並以高壓端分別連接於各二次側線圈之 另一端，藉以使感應線圈、二次側線圈及二冷陰極管以串聯方式 互相連接，透過二次側線圈與一次側線圈感應，以提供驅動冷陰 極管之電壓，同時由於冷陰極管係位於串聯電路上，因此二冷陰 極管會具有相同的電流。 而平衡回路則與各個冷陰極管驅動回路中的感應線圈產生 磁力線感應’藉以平衡各個冷陰極管驅動回路巾的冷陰極管之管 電流，以得到一致的發光亮度。 本發明之功效在於，於本發明中每一個冷陰極管驅動回路只 :聯二個冷陰極管’而強迫二冷陰極管的電流平衡，亦即每一個 夂C心、需要驅動二個冷陰極管，可有效降低變塵器的負載，避 免如同美國專利公職U s> 2_嶋及U· S.測5麵期等 負載過向的問題。而不同變㈣所驅動的冷陰極 &再透過個平衡鹏來進行平衡，因此仍可視需求增加冷陰 圣官數而同時平衡所有冷陰極管之管電流。 、下在^方式巾抽敘述本發明之詳細特徵以及優點，其 足乂使任何W相關技蟄者了解本發明之技術内容並據以實 孰^根據本。兄明書所揭露之内容、申請專利範園及圖式，任何 ^相關技藝者可輕㈣理解本發明_之目縣優點。 7 1343043 【實施方式】 ^ 、w_第1圖」所示，係為本發明實施例所提供之冷陰極 官之平衡電路的電路圖，苴一带 广 ，、电/原供應回路】〇〇、複數個冷陰極 管驅動回路200及一平衡回路3〇心The Cold Cathode Fluorescent Lamp is used as a light source of a backlight module (and a fan) and is driven by a driver circuit of an inverter. Due to the ever-increasing size of liquid crystal display panels, a single CCFL cold cathode tube has been unable to provide proper illumination brightness, requiring two or more ccfl cold cathode tubes for assurance. In a liquid crystal display panel using a plurality of cold cathode tubes, in order to ensure uniform brightness of the liquid crystal display panel, it is necessary to adjust the current flowing through each of the ccfl cold cathode tubes at any time so as to flow through each of the CCFL cold cathode tubes. The electric current is equal to 7. The parasitic parameters (parasitic resistance or parasitic capacitance) of each CCFL cold cathode tube are different' so it is difficult to maintain the impedance of each CCFL cold cathode tube, and each CCFL cold cathode The impedance of the tube is not-scaled, which causes the current flowing through each of the cold cathode tubes to be different, so that each cold cathode tube has a different grief. Therefore, how to provide a balance of each of the cold cathode f current (10) Z to maintain the current flowing through each of the cold cathodes or (four) each of the cold cold insular, thus creating a position on the liquid crystal display H surface The effect, while reducing electronic control and power conversion equipment to achieve a reduction in the cost of New Zealand, will be currently suitable for solving the problem of 5 1343043. The current design 'needle changes the drive circuit type, and the tube current of different cold cathode tubes is balanced by the drive circuit, such as the Republic of China patent TW57344i. However, this design is balanced every time - there is still a balance of t-junction between the cold cathode tubes of the cold cathode tubes. For the above balancing circuit, U.S. Patent Publications US 20_93471 and US 2GG5_3472 use a single closed loop to simultaneously flatten the current of cold cathode (four), and all such cold cathodes are connected to the secondary side of the same-transformer. If the number of cold cathode tubes increases, the load on the transformer will also increase. 'A high-load transformer must be used to achieve this. also. If the circuit design of the cold cathode tube is not connected to the ground, the low voltage end of the cold cathode tube can not obtain the tube current for feedback control, which makes the current regulation of the tube current difficult. SUMMARY OF THE INVENTION Conventional balancing circuits are not suitable for simultaneously balancing the tube currents of a plurality of cold cathode tubes. Meanwhile, for cold cathode tubes that are not grounded, shout detection cannot be performed. The above problem is provided by the present invention. The present invention provides a balanced circuit for a cold cathode tube for balancing the currents of a plurality of cold cathode tubes so that the brightness of each cold cathode tube tends to be uniform, and at the same time, the cold cathode tube which is ungrounded can be inferred. The surface and current, the signal of the control of the grant. To achieve the above object, the present invention discloses a balanced circuit for a cold cathode tube, comprising: a power supply circuit, a plurality of cold cathode tube drives, and a balanced port road power supply circuit having a power supply and a plurality of parallel connections The primary side coils 'each: the secondary side line _ are connected to the power source for receiving - power input. A plurality of cold cathodes s, the dynamic circuit 'divided in the same - pick _ its towel", which makes each cold 6 1343043 cathode official drive circuit contains a series of induction coils, two secondary side coils and two cold cathode tubes . The secondary side coils respectively generate magnetic induction with the corresponding primary side coils, and the secondary side coils are respectively connected to the two ends of the induction coils, and the low voltage ends of the cold cathode tubes are connected to each other and connected by high voltage ends respectively. At the other end of each secondary side coil, the induction coil, the secondary side coil and the secondary cold cathode tube are connected to each other in series, and are transmitted through the secondary side coil and the primary side coil to provide a voltage for driving the cold cathode tube. At the same time, since the cold cathode tubes are on the series circuit, the two cold cathode tubes will have the same current. The balance circuit generates magnetic line inductance with the induction coils in each of the cold cathode tube drive circuits to balance the tube current of the cold cathode tubes of the respective cold cathode tubes to drive the loops to obtain a uniform luminance. The effect of the invention is that in the invention, each cold cathode tube drive circuit only combines two cold cathode tubes to force the current balance of the two cold cathode tubes, that is, each 夂C core needs to drive two cold cathodes. The tube can effectively reduce the load of the dust collector and avoid the problem of load over-loading such as U.S. patents U s> 2_嶋 and U·S. The cold cathodes & driven by the different variables (4) are balanced by a balanced pendulum. Therefore, it is still possible to increase the number of cold and sacred officials while balancing the tube currents of all the cold cathode tubes. The detailed features and advantages of the present invention are described in the following description, which is sufficient to enable any of the related art to understand the technical contents of the present invention and to implement the present invention. The content disclosed in the brother book, the application for the patent garden and the schema, any relevant artisan can lightly understand the advantages of the invention. 7 1343043 [Embodiment] ^, w_ Figure 1 is a circuit diagram of a cold cathode official balance circuit provided by an embodiment of the present invention, which is widely distributed, and the electric/original supply circuit is 〇〇, plural a cold cathode tube drive circuit 200 and a balance circuit 3
电源供應回路觸包含有_電源及複數個並聯之 -其中各-次側線請係連接於—電源S1，用以接收^ 力輸入，以產生—磁力線’且各—次側線圈削具有相同的繞線 開數’以使所有的-次側線圈m都具備相同的電氣特性。每— 個-次側線圈m係用以驅動—對冷陰極管⑽，因此一次側線 ΊΗ)之數目係、針騎需驅動的冷陰極管23()數目所設置，為方 便·»兒月本貝知例係以一個一次側線圈U 〇進行說明。The power supply circuit contacts include _ power supply and a plurality of parallel connections - wherein each of the secondary side lines is connected to the power supply S1 for receiving the force input to generate the magnetic field line and each of the secondary side coils has the same winding The line opening number ' is such that all the secondary side coils m have the same electrical characteristics. The number of each of the secondary-secondary coils m is used to drive the pair of cold cathode tubes (10), so the number of primary side turns is set, and the number of cold cathode tubes 23 () to be driven by the needle ride is set for convenience. The example of the case is described by a primary side coil U 〇.
月再多閱第2圖」所示’各冷陰極管驅動回路2〇〇分別對 應於-次側制11G其中之—。各冷陰極管驅動回路包含有 一感應線圈210、二個二次侧線圈22〇及二冷陰極管23〇。各冷险 極管230之低壓端係互相連接，且係與另一组冷陰極管驅動= 2〇〇之冷陰極管23㈣低壓端連接。而二次側線圈—之一端係 分別連接於感應_ 210之二端，且各冷陰極管23()之高壓端: 別連接各二次側線圈22G之另-端’藉以使感應線圈21〇、二個 二次側線圈220及二冷陰極管23〇以串聯方式互相連接形成一電 流回路，由於二冷陰極管23G係串聯而位於同—電流回路上，= 此會具有相同的管電流。 又，二個二次側_22G係分別與其所對應之—次側線圈ιι〇 8 1343043 產生磁力線祕，形成-髓器’用轉換電源S1輸出之電壓， 使二次側線圈220產生足夠的電壓以驅動二冷陰極管23〇。 如月0所述，由於同一個冷陰極管驅動回路2〇〇中的二冷陰極 管230串聯於同-電流回路上，因此具有相同的管電流。但是不 同的冷陰極管驅動回路200中，仍會因為冷陰極管23()的特性差 異，而使管電流不同。因此透過平衡⑽3〇〇，與各冷陰極管驅 動回路200中的感應線圈210產生磁力線感應，藉以平衡各冷陰 極管驅動回路200中的管電流，而使所有的冷陰極管23〇的管; 流達成一致。 平衡回路300 #有複數個平衡線圈31〇及一偵測線圈32〇， 串聯形成-封閉回路，其中每一個平衡線圈31〇係與感應線圈21〇 其中之-產生磁力線感應，而強迫通過感應_ 21()的電流被平 衡’而通爾麟目21〇之電魏是冷雜f 23㈣管電流，因 此所有的冷陰極管230都可以具有相同的管電流。也就是說，同 一個冷陰棘鶴_ 中，由於冷陰極管23G獅串聯方式 連接’因此會具有相同的管電流。而不同的冷陰極管驅動回路 200 ’透過平衡回路300與感應線圈21〇感應，也可以使不同的冷 陰極管驅動回路200中的管電流達成平衡，藉以使所有的冷陰極 官230之管電流達成—致，而得到—致的亮度。 此外，本發明之冷陰極管23〇雖然不接地而將低壓端連結在 :仍可透過平衡回路來進行電壓及電流之回授偵測， 八乍务疋將平衡回路中的債測線目與一回授線圈4〇〇互相產 9 1343043 1力線感應，藉由回授電路偵測回授線圈的電壓回授％ 及-电流回授Is ’即可得知冷陰極管驅動回路2〇〇中的電流變化， ^即冷陰齡⑽的管魏’以作為賴洲峨，崎時調整 ..電源si的輪出’以改變冷陰極管23〇之管電流大小。 本發明提供之冷陰極管之平衡電路，係將每—個—次側線圈 110所驅動的冷陰極管230㈣，使每—個—次側_ UG所驅動 鳴#冷陰極官23〇之管電流達成一致。接著再透過平衡線圈训來 平衡不同變壓器所驅動的冷陰極管230之管電流。此種設計減少 每-個-次側線圈UO所驅動的冷陰極管23G數量，而不同一次 側線圈110所驅動的冷陰極管230之管電流又可被平衡，以獲得 ' 一致的亮度。此外，雖然冷陰極管230與二次側線圈21〇形^争 ’聯回路，而導致冷陰極管230的低塵端不接地，但是平衡回路3〇〇 中的偵測線圈320可透過磁力線感應方式，以回授線圈來偵 測冷陰極管230的管電流及電壓變化，仍可取得回授訊號來進行 • 電源輸出的調整，以使管電流被調控至最佳的大小。 雖然本發明㈣述之實施例揭露如上，然其並翻以限定本 發明。在不脫離本發明之精神和範圍内，所為之更動與潤飾，均 屬本發明之補保護翻。關於本發酬界定之保護範圍請參考 所附之申請專利範圍。 > 【圖式簡單說明】 第1圖係為本發明實施例提供之冷陰極管之平衡電路之電路 圖；以及 10 1343043 第2圖係為本發明實施例中，冷陰極管驅動回路之電路圖。 【主要元件符號說明】In the month of the second reading, the respective cold cathode tube drive circuits 2' are respectively corresponding to the -1 side side 11G. Each of the cold cathode tube drive circuits includes an induction coil 210, two secondary side coils 22A, and two cold cathode tubes 23A. The low voltage ends of the cold current tubes 230 are connected to each other and connected to the low voltage end of the cold cathode tube 23 (4) of another group of cold cathode tubes. And the secondary side coil - one end is respectively connected to the two ends of the induction _ 210, and the high voltage end of each cold cathode tube 23 (): the other end of each secondary side coil 22G is connected to make the induction coil 21 〇 The two secondary side coils 220 and the two cold cathode tubes 23 are connected in series to form a current loop. Since the two cold cathode tubes 23G are connected in series, they are located on the same current loop, and this will have the same tube current. Moreover, the two secondary side _22G systems respectively generate a magnetic line secret with the corresponding secondary side coil ιι 〇 8 1343043, forming a voltage outputted by the splicing power source S1, so that the secondary side coil 220 generates a sufficient voltage. To drive the two cold cathode tubes 23 〇. As described in month 0, since the two cold cathode tubes 230 in the same cold cathode tube drive circuit 2 are connected in series to the same current circuit, they have the same tube current. However, in the different cold cathode tube drive circuit 200, the tube current is different due to the difference in characteristics of the cold cathode tube 23(). Therefore, through the balance (10) 3 〇〇, the magnetic induction line is induced with the induction coil 210 in each of the cold cathode tube drive circuits 200, thereby balancing the tube currents in the cold cathode tube drive circuits 200, and making all the tubes of the cold cathode tubes 23 〇; The flow reached an agreement. The balance circuit 300 has a plurality of balance coils 31〇 and a detection coil 32〇, and a series-closed loop is formed in series, wherein each of the balance coils 31 and the induction coils 21 are generated therein to generate magnetic line induction, and the force is induced by induction _ The current of 21() is balanced' and the electric current of the 通 麟 〇 21 〇 is the cold-filled f 23 (four) tube current, so all the cold cathode tubes 230 can have the same tube current. That is to say, in the same cold turf crane _, since the cold cathode tube 23G lion is connected in series, it will have the same tube current. The different cold cathode tube drive circuit 200' is induced by the balance circuit 300 and the induction coil 21, so that the tube currents in the different cold cathode tube drive circuits 200 can be balanced, so that all the tubes of the cold cathode tube 230 are current. Achieve the result, and get the brightness. In addition, although the cold cathode tube 23 of the present invention is not grounded, the low voltage end is connected to: the voltage and current feedback detection can still be performed through the balance loop, and the 债 乍 疋 疋 疋 疋 疋The feedback coil 4〇〇 produces 9 1343043 1 force line induction, and the feedback circuit detects the voltage feedback of the feedback coil % and the current feedback Is ' to know the cold cathode tube drive circuit 2 The current change, ^ is the cold yin age (10) of the tube Wei 'as the Lai Zhou 峨, Saki time adjustment.. Power si round out 'to change the cold cathode tube 23 〇 tube current size. The balancing circuit of the cold cathode tube provided by the present invention is a cold cathode tube 230 (four) driven by each of the secondary-side coils 110, so that each of the secondary-side _ UG drives the cathode current of the cold cathode. Agree. Then, the balance coil is used to balance the tube current of the cold cathode tube 230 driven by the different transformers. This design reduces the number of cold cathode tubes 23G driven by each of the secondary-side coils UO, and the tube currents of the cold cathode tubes 230 driven by the different primary side coils 110 can be balanced to obtain 'consistent brightness. In addition, although the cold cathode tube 230 and the secondary side coil 21 are in a loop-like manner, and the low-dust end of the cold cathode tube 230 is not grounded, the detecting coil 320 in the balance circuit 3〇〇 can be induced by magnetic lines of force. In the manner, the feedback coil is used to detect the tube current and voltage changes of the cold cathode tube 230, and the feedback signal can still be obtained to adjust the power output so that the tube current is regulated to an optimal size. Although the embodiment of the invention (4) is disclosed above, it is intended to limit the invention. The modification and retouching of the present invention are all provided by the present invention without departing from the spirit and scope of the present invention. Please refer to the attached patent application scope for the scope of protection defined by this offer. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram of a balanced circuit of a cold cathode tube according to an embodiment of the present invention; and 10 1343043 FIG. 2 is a circuit diagram of a cold cathode tube drive circuit in an embodiment of the present invention. [Main component symbol description]
100 電源供應回路 200 冷陰極管驅動回路 300 平衡回路 110 一次側線圈 S1 電源 230 冷陰極管 210 感應線圈 220 二次側線圈 230 冷陰極管 300 平衡回路 310 平衡線圈 320 偵測線圈 400 回授線圈 Vs 電壓回授 Is 電流回授 11100 power supply circuit 200 cold cathode tube drive circuit 300 balance circuit 110 primary side coil S1 power supply 230 cold cathode tube 210 induction coil 220 secondary side coil 230 cold cathode tube 300 balance circuit 310 balance coil 320 detection coil 400 feedback coil Vs Voltage feedback Is current feedback 11