•M3 5 8472 五、新型說明： 【新型所屬之技術領域】 本創作係關於一種多燈管驅動電路’特別係關於可用來 提供穩定電流給燈管裝置之多燈管驅動電路。 【先前技術】• M3 5 8472 V. New description: [New technical field] This creation is about a multi-lamp drive circuit', especially for a multi-lamp drive circuit that can be used to provide a steady current to the lamp unit. [Prior Art]
近年來，隨著液晶顯示面板之尺寸不斷增大，包含多 個冷陰極榮光燈管(Cold Cathode Fluorescent Lamp，CCFL) 之背光裝置更加廣泛地被用來提供液晶顯示面板所需之高 品質光源。 然而，多燈管背光裝置所面臨之最大難題在於：如何 使得每一個燈管之電流均能維持大致相等，以確保提供給 液晶顯示面板之光源具有非常穩定且均勻之亮度。 請參閱圖一。圖一係繪示先前技術中多燈管背光裝置 1的示意圖。如圖一所示，多燈管背光裝置1中之變壓器 10、12分別包含主線圈1〇〇、12〇及侧線圈1〇2、122，並 且側線圈102、122分別耦接並提供電流至燈管14以使燈 官丨4發光。然而，由於主線圈10〇、12〇係以並聯相耦接 並且母個變壓器1 〇、12的規格不盡相同’所以會導致流經 主線圈100、120的電流不相等。因此，側線圈1〇2、122 所感應到的電流亦不相同，造成燈管14之亮度不均勻。 此外，電源裝置16所傳送的交流電壓，不一定能維持 同樣的電壓位準。有時可能會因為電源裝置16内部的元件 老化或是損壞，而造成某一段時間的由電源裝置16所提供 的電壓或電流過高，將使得輸入到變壓器1〇、12之主線圈 4 M3 5 8472 100、120的電壓或電流也跟著提高。這些過高的電壓以及 電流會使得感應在侧線圈102、122的電壓或電流進而提 高’造成燈管14會得到一段過高的電壓或電流，造成燈管 14的損壞。反之，電源裝置16所提供的電壓或電流也可 能發生過低的情況，將使得輸入到變壓器10、12之主線圈 、120的電壓或電流也跟著變低，造成燈管14的亮度 不足的情況發生。 【新型内容】In recent years, as the size of liquid crystal display panels has been increasing, backlight devices including a plurality of Cold Cathode Fluorescent Lamps (CCFLs) have been more widely used to provide high quality light sources required for liquid crystal display panels. However, the biggest challenge faced by multi-lamp backlights is how to keep the current of each lamp approximately equal to ensure a very stable and uniform brightness of the light source provided to the liquid crystal display panel. Please refer to Figure 1. 1 is a schematic view showing a multi-lamp backlight device 1 of the prior art. As shown in FIG. 1, the transformers 10, 12 in the multi-lamp backlight device 1 respectively include main coils 1 〇〇, 12 〇 and side coils 1 〇 2, 122, and the side coils 102, 122 are respectively coupled and supplied with current to The tube 14 is illuminated to illuminate the lamp. However, since the main coils 10, 12 are coupled in parallel and the specifications of the mother transformers 1 and 12 are not the same, the current flowing through the main coils 100, 120 is not equal. Therefore, the currents induced by the side coils 1 and 2, 122 are also different, resulting in uneven brightness of the bulb 14. In addition, the AC voltage transmitted by the power supply unit 16 does not necessarily maintain the same voltage level. Sometimes the voltage or current supplied by the power supply unit 16 for a certain period of time may be too high due to aging or damage of the components inside the power supply unit 16, which will cause the main coil 4 M3 5 input to the transformers 1 and 12. 8472 100, 120 voltage or current is also increased. These excessive voltages and currents can cause the voltage or current induced in the side coils 102, 122 to increase, causing the lamp 14 to get an excessive voltage or current, causing damage to the lamp 14. Conversely, the voltage or current supplied by the power supply device 16 may also be too low, so that the voltage or current input to the main coils 120 of the transformers 10, 12 will also become lower, resulting in insufficient brightness of the lamp 14. occur. [New content]
本創作揭露一種多燈管驅動電路，其係可供燈管裝置 應用。多燈管驅動電路包含控制模組、第一變壓器以及第 一變壓器。控制模組可用來產生第一方波訊號以及第二方 波訊號，且包含有回授接點。第一變壓器包含第一主線圈、 第一次線圈以及感應線圈。第一主線圈可用來接收第一方 波訊號。第-次線圈係對應第—主線圈絲接至燈管 置。感應線圈係對應第-主線圈並祕於回授接點 ： 變壓器包含第二主線圈以及第二次線圈。第二主線圈與 主，圈係相互串聯，並且第二主線圈可接收第二方波 k。第二次線圈係對應第—主線圈域接至燈管裝置。° 其中，感應線圈係根據第一主線圈之第一方波 應=饋訊號，控侧組隨即可根據 ^方1 訊號與第二方波訊號。 '弟方波 、…〜q 又多燈管驅動電路， 器以及第二變壓器係為串連狀 ：變查 —進而產生回饋訊號回授給控制模組内 5 M358472 225上。且感應線圈223旋繞於第一主 遠離第-次線圈222之-端。、線圈221之一侧且位於 再如圖—A所不，第一主線阐％^ > 21之第一輪中# P1 21係耦接至控制模組 —欠、_收第—方波訊號P11。第 對應第一主線ί 221並耦接於控制模組21之回授接點朽。 圈 另外，第二變壓器23包含有第二主 二人線圈232。第二主線圈231與第魂 苐— 聯並且第—主線圈231可接收由控制 = 端P2輸出之第二方波訊號p2 一以、、且21之苐二輸出 二主绩HI - 儿 弟一次線圈232係對應第 23丨’並減至燈管裝置％之第二冷陰極螢光燈 此外，請參閱圖二c。圖二c —具體實施例之多燈管_讀據本創作之另 例中，顯轉置㈣。於此具體實施 欠绫題？79 β铉 型冷陰極螢光燈管263。第 光燈㈣之次線圈232則分別驗至U型冷陰極榮 地電之乡燈f轉電路2找—步包含對 圈223，並可用來^^/。電阻24係減至感應線 地雷卩且24 Μ來如仏電位準，感應線圈223即經由對 授接點Ρ3之Η，。整流電路25係耦接於感應線圈223與回 二太傭，日’並可料對訊驗行錢的動作。以下將 f本創作之夕燈管_電路2，進行更詳細的說明。 請參閱圖二D。圖二D係纷示圖二A中之方波訊號流 7 M358472 據，判斷第一方波訊號P11或是第二方波訊號p21是 輸出的異常。 凊參閱圖一 E ’圖二e係繪示方波訊號的示意圖。如 圖二E所示，第一方波訊號p丨丨與第二方波訊號p2丨之相 位差為90度。主線圈訊號P41與回饋訊號p411相似。回 饋訊號P411經過整流電路25即可得到整流訊號p4i2。在 此以第-週期τι之整流訊號P412作為參考訊號，此時的 整流訊號P412可代表第一方波訊號pn以及第二方波訊 號P21正常時的輪出訊號。接著，第二週期T2之整流訊 號Ρ412將送入控制模組21之回授接點ρ3。此時，控制模 組21立即將第二週期Τ2之整流訊號ρ412與第一週期 之整流讯號P412相比較。在比較之後若得到第二週期T2 之整流訊號P412與第一週期τΐ之整流訊號PW2相同的 結果，則控制模組21將判定第二週期丁2所送出之第—方 波訊號P11以及第二方波訊號P21無異常，故不需要調 整。以下將對有異常輸出之探討。 明參閱圖一 F。圖二F係緣示圖二E中之接連週期之 方波的示意圖。如圖二F所示，第四週期T4之整流訊號 Ρ412依然與第三週期Τ3之整流訊號ρ412相同。因此，控 制模組不需對第一方波訊號Ρ11以及第二方波訊號Ρ21做 調整。而在第五週期Τ5時，第一方波訊號P11以及第二 方波訊號P21發生異常。此時，第五週期T5之主線圈訊 號P41的週期以及振幅都大幅度的變化。相對地，第一變 壓器22之第—次線圈222在第五週期T5間也將會感應出 有問題之主線圈訊號P41，並將主線圈訊號P41供應給燈 9 M3 5 8472 整流訊號P412有異常時’控制模組21將可對第一方波訊 5虎P11與第'一方波訊號P21進行調整。最後使得燈管裝置 26能保持在穩定的亮度。The present invention discloses a multi-lamp driving circuit that can be used for a lamp tube device. The multi-lamp driving circuit includes a control module, a first transformer, and a first transformer. The control module can be used to generate the first square wave signal and the second square wave signal, and includes a feedback contact. The first transformer includes a first main coil, a first coil, and an induction coil. The first primary coil can be used to receive the first square wave signal. The first-order coil is connected to the lamp tube corresponding to the first-core coil. The induction coil corresponds to the first-main coil and is secretive to the feedback contact: The transformer includes a second primary coil and a second secondary coil. The second main coil is connected in series with the main and the coils, and the second main coil can receive the second square wave k. The second coil is connected to the lamp unit corresponding to the first main coil field. ° The induction coil is based on the first square wave of the first main coil = the feed signal, and the control side group can be based on the square 1 signal and the second square wave signal. 'Di fang wave, ... ~ q and more lamp drive circuit, the second transformer is connected in series: change - and then generate feedback feedback to the control module 5 M358472 225. And the induction coil 223 is wound around the end of the first main away from the first-second coil 222. One side of the coil 221 is located next to the figure A-A, and the first main line illustrates the first round of the #21, and the P1 21 is coupled to the control module - the owed, the _received - square wave signal P11. The first corresponding main line ί 221 is coupled to the feedback connection of the control module 21. In addition, the second transformer 23 includes a second main two-person coil 232. The second main coil 231 is connected to the first soul and the first main coil 231 can receive the second square wave signal p2 outputted by the control terminal P2, and the second output of the second is the second achievement HI - the younger brother The coil 232 is the second cold cathode fluorescent lamp corresponding to the 23rd' and reduced to the lamp unit %. Please refer to FIG. 2c. Figure 2c - Multi-lamp of a specific embodiment - In another example of the present creation, the transposition (4) is shown. In this specific implementation of the problem? 79 β铉 type cold cathode fluorescent lamp 263. The secondary coil 232 of the first light (4) is respectively tested to the U-type cold cathode 荣 地 地 地 地 地 f 2 2 2 2 2 包含 包含 包含 包含 包含 包含 包含 包含 包含 223 223 223 223 223 223 223 223 223 223 The resistor 24 is reduced to the sense line and the ground is quasi-biased, and the induction coil 223 is connected to the contact point Ρ3. The rectifying circuit 25 is coupled to the induction coil 223 and the second servant, and the action of the money can be verified. The following is a more detailed description of the lamp _circuit 2 of this creation. Please refer to Figure 2D. Figure 2D shows the square wave signal flow in Figure 2A. 7 M358472 According to the data, it is determined that the first square wave signal P11 or the second square wave signal p21 is an abnormal output.凊 Refer to Figure 1 E ’ Figure 2 e shows a schematic diagram of a square wave signal. As shown in Fig. 2E, the phase difference between the first square wave signal p丨丨 and the second square wave signal p2丨 is 90 degrees. The main coil signal P41 is similar to the feedback signal p411. The feedback signal P411 passes through the rectifier circuit 25 to obtain the rectified signal p4i2. Here, the rectification signal P412 of the first period τι is used as the reference signal, and the rectification signal P412 at this time can represent the round-out signal when the first square wave signal pn and the second square wave signal P21 are normal. Then, the rectified signal Ρ 412 of the second period T2 is sent to the feedback junction ρ3 of the control module 21. At this time, the control module 21 immediately compares the rectified signal ρ412 of the second period Τ2 with the rectified signal P412 of the first period. After the comparison, if the rectified signal P412 of the second period T2 is the same as the rectified signal PW2 of the first period τΐ, the control module 21 determines the first-square wave signal P11 and the second sent by the second period D2. The square wave signal P21 has no abnormality, so no adjustment is needed. The following discussion will discuss the abnormal output. See Figure 1 F for details. Fig. 2F is a schematic diagram showing the square wave of successive cycles in Fig. 2E. As shown in FIG. 2F, the rectified signal Ρ412 of the fourth period T4 is still the same as the rectified signal ρ412 of the third period Τ3. Therefore, the control module does not need to adjust the first square wave signal Ρ11 and the second square wave signal Ρ21. In the fifth cycle Τ5, the first square wave signal P11 and the second square wave signal P21 are abnormal. At this time, the period and amplitude of the main coil signal P41 of the fifth period T5 largely change. In contrast, the first coil 222 of the first transformer 22 will also induce the problematic main coil signal P41 during the fifth period T5, and supply the main coil signal P41 to the lamp 9 M3 5 8472. The rectified signal P412 has an abnormality. The control module 21 will be able to adjust the first party wave 5 tiger P11 and the first party wave signal P21. Finally, the lamp unit 26 can be maintained at a constant brightness.
此外，回饋訊號P411不限於只能由第一變壓器22之 感應線圈223感應第一主線圈221之主線圈訊號P41而形 成。換言之，亦可將感應線圈223設置在第二變壓器23 内，並對應於第一主線圈231，同樣可感應出相同於第一 主線圈221之主線圈訊號P41。 相較於習知技術，本創作之多燈管驅動電路，由於第 -主線圈與第二域圈φ聯’因此流經第—域圈與第二 主線圈的電流（即-次侧钱)㈣，由於—次側電流相 同’因此第-次線圈及第二次線圈所感應到的二次側電流 亦相同。藉此，相同的電流可以提供至第一冷陰 管及第二冷陰極螢光燈管，使其具有穩定且均勾之真产。 再者，本㈣之多燈管_電路可錢線_第:主 ^控制拉、組可根據回鎮訊號調整下一個輸出之 :訊號或疋第二方波訊號的週期或振幅，進而使得 主線圈訊舰轉在—_韻㈣下 々 地控制燈管裝置輸㈣衫度的光線。 卩可有效 藉由以上較佳具體實施例之詳述，係 描述本創作之特徵與精神，而並非以上述加以 :實施例來對本創作之範嘴 :路:較佳具 希望能涵蓋各種改變及且 相反地，其目的是 之專利範圍的範,内因等排於本創作所欲申請 因此，本創作所申請之專利範圍的 11 M3 5 8472 範疇應該根據上述的說明作最寬廣的解釋，以致使其涵蓋 所有可能的改變以及具相等性的安排。Further, the feedback signal P411 is not limited to being formed only by the induction coil 223 of the first transformer 22 sensing the main coil signal P41 of the first main coil 221. In other words, the induction coil 223 can also be disposed in the second transformer 23 and corresponding to the first main coil 231, and the main coil signal P41 identical to the first main coil 221 can be induced. Compared with the prior art, the multi-lamp driving circuit of the present invention has a current flowing through the first domain coil and the second main coil (ie, the secondary side money) because the first main coil is connected to the second domain coil φ. (4) Since the secondary current is the same, the secondary current induced by the first coil and the second coil is also the same. Thereby, the same current can be supplied to the first cold cathode tube and the second cold cathode fluorescent tube to make it stable and uniform. Furthermore, the (4) multi-lamp _ circuit can be a money line _: main ^ control pull, the group can adjust the next output according to the return signal: the period or amplitude of the signal or the second square wave signal, thereby making the main The coil signal ship turns to - _ rhyme (four) to control the light tube device to lose (four) the light of the shirt. The features and spirit of the present invention are described in detail by the above detailed description of the preferred embodiments, and are not described in the foregoing: the embodiments are intended to cover the scope of the present invention. On the contrary, the purpose is to extend the scope of the patent, and the internal factors are to be applied in this creative application. Therefore, the scope of the 11 M3 5 8472 patent scope of the application for this creation should be interpreted broadly according to the above description, so that It covers all possible changes and arrangements of equality.
12 M3 5 8472 【圖式簡單說明】 圖一係繪示先前技術中多燈管背光裝置1的示意圖。 圖二A係繪示根據本創作之一具體實施例之多燈管驅 動電路的示意圖。 圖二B係繪示圖二A之第一變壓器的結構示意圖。12 M3 5 8472 BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a multi-lamp backlight device 1 of the prior art. Figure 2A is a schematic illustration of a multi-lamp drive circuit in accordance with one embodiment of the present invention. Figure 2B is a schematic view showing the structure of the first transformer of Figure 2A.
圖二C係繪示根據本創作之另一具體實施例之多燈管 驅動電路的示意圖。 圖二D係緣示圖二A中之方波訊號流向的示意圖。 圖二E係纟會示方波訊號的示意圖。 圖二F係繪示圖二E中之接連週期之方波的示意圖。 【主要元件符號說明】 1 :多燈管背光裝置 10、12 :變壓器 100、120 :主線圈 14 :燈管 16 :電源裝置 102、122 :側線圈 2:多燈管驅動電路 21 :控制模組 22 :第一變壓器 221 :第一主線圈 222 :第一次線圈 223 :感應線圈 224、225 :磁芯 23 :第二變壓器 231 :第二主線圈 232 :第二次線圈 24 :對地電阻 25 :整流電路 13Figure 2C is a schematic illustration of a multi-lamp drive circuit in accordance with another embodiment of the present invention. Figure 2D is a schematic diagram showing the flow direction of the square wave signal in Figure 2A. Figure 2E shows the schematic diagram of the square wave signal. FIG. 2F is a schematic diagram showing a square wave of successive cycles in FIG. 2E. [Main component symbol description] 1 : Multi-lamp backlight device 10, 12: Transformer 100, 120: Main coil 14: Lamp 16: Power supply device 102, 122: Side coil 2: Multi-lamp driving circuit 21: Control module 22: first transformer 221: first main coil 222: first coil 223: induction coil 224, 225: magnetic core 23: second transformer 231: second main coil 232: second coil 24: ground resistance 25 : rectifier circuit 13