TWI220994B - Transformer for driving multiple lamps - Google Patents
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- TWI220994B TWI220994B TW92127456A TW92127456A TWI220994B TW I220994 B TWI220994 B TW I220994B TW 92127456 A TW92127456 A TW 92127456A TW 92127456 A TW92127456 A TW 92127456A TW I220994 B TWI220994 B TW I220994B
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Description
1220994 五、發明說明 【發明所 本發 多冷陰極 器，及具 【先前技 冷陰 Lamp)已 背光模組 燈管係由 由於技術 使得單一 多個燈管 各燈管之 陰極螢光 因，使得 使電流無 亮度不均 管間的老 習知 的最直接 回授控制 控制在固 驅動複數 例。燈管 (1) 屬之技術領域】 ^ 2 2 2 一種多燈管驅動電路，特別是關於一種 “燈官（CCFL)之驅動電路中所使用的變壓 術】匕種^1壓裔之多冷陰極榮光燈管驅動電路。 ‘口 ：、且 $ ( CCFL’ Cold Cathode Fluorescent (系使用於液晶顯示面板（L C D P a n e 1)中做為 一 Backlight System)之光源。此等冷陰極螢光 進2為換流器（Inverter)之驅動電路所驅動。 燈^及消費者的需求，LCD面板尺寸不斷增大， 二=已無法滿足其照明，因而需要使用二個或更 二了確保LCD面板的亮度均勻，必須隨時調節 :，流經每一燈管之電流量相等。但由於冷 二I係^度不穩定且具有負阻抗特性等種種原 、I阻抗报難維持一致，造成各燈管阻抗改變而 成。各燈管之間電流不相等，除了會使 二: ^流太大的燈管還會減短壽命，使得各燈 化速率（Aging Rate)不一致。 m 稷個冷陰極螢光燈管具有相同亮度 ^丄疋^每一個燈管使用個別的驅動電路及 二彳t所#垃官的電流可以一共同控制信號來予以 ^ W弟五圖顯不習知技術採用個別驅動電路來 ，冷陰極榮光燈管之電路架構，其係以二燈管為 2係刀別叉電路1 3、1 4及變壓器1 5、1 6所驅 國 第5頁 1220994 五、發明說明（2) 動及控制，流經燈管1卜1 2之電流I η、I !分別回授至電路 1 3、1 4，以將電流I η、I丨构控制於一預設之固定值，達到 電流相等之效果。然而，由於需要為每一燈管均設置一驅 動與控制電路，此種電路相對地具有較高之元件成本，且 佔用較大的空間。 一種習知不需要設置多個驅動及控制電路之技術，係 使用鎮流（bal last)元件，來使各燈管之間的電流差異 盡可能地縮小。第六圖顯示習知技術採用單一驅動電路來 驅動複數個冷陰極螢光燈管之電路架構圖，其係以二燈管 為例。如圖所示，二燈管2卜2 2係成並聯連接，並由一電 路2 3及一變壓器2 5所驅動。二燈管2卜2 2之高壓端係分別 串接一電容27、28做為鎮流元件（Bal last)。二電容 2 7、2 8係具有相同之阻抗，且其阻抗值遠大於燈管2卜2 2 之阻抗，足以使得流經二燈管2卜2 2之電流I 21、I 2妁大小 主要受電容阻抗所支配。亦即，即使二燈管2卜2 2之阻抗 產生差異時，對電流I 21、I 2之差異的影響非常輕微而可忽 略。因此二個受共同高壓驅動源所驅動之燈管2卜2 2可被 調節成具有相近之電流值。然而，為了使電流分配控制可 以更精確，亦即，使電流I 21、I 2之差異盡可能縮小，此電 路將必須使用高阻抗之鎮流元件，故需要異常高的驅動電 壓。高驅動電壓的產生與處理是非常耗費成本且困難達成 的，因此此種方式並未被廣泛地使用。 另一種習知可不需要設置多個驅動及控制電路之技 術，係使用差動鎮流元件（D i f f e r e n t i a 1 B a 1 1 a s t)。第1220994 V. Description of the invention [Multi-cold cathode device of the invention and the backlight module module of the previous technology [Long Yin Lamp] are based on the technology to make the cathode fluorescent light of each tube of a single multiple tube, The oldest known direct feedback control that makes the current without brightness unevenness between the tubes is controlled in a plurality of examples. The technical field of the lamp (1)] ^ 2 2 2 A multi-lamp driving circuit, especially about a "voltage transformer used in the driving circuit of a lamp officer (CCFL)" Cold cathode glare tube drive circuit. 'Port: and (CCFL') Cold Cathode Fluorescent (used as a Backlight System in the LCD panel (LCDPane 1)). These cold cathode fluorescent lights enter 2 for It is driven by the drive circuit of the inverter. The size of the LCD panel keeps increasing due to the light and consumer demand. Two = the lighting can no longer be met, so two or two are needed to ensure the brightness of the LCD panel is uniform. Must be adjusted at any time: the amount of current flowing through each tube is equal. However, due to the cold second I series, which is unstable and has negative impedance characteristics, the original and I impedance reports are difficult to maintain consistent, causing the impedance of each lamp to change. In addition, the currents between the lamps are not equal, in addition to making the lamps with two currents too large, the life will be shortened, and the Aging Rate will be inconsistent. M A cold cathode fluorescent lamp has Same brightness ^ 丄 疋 ^ each The lamp uses an individual drive circuit and the current of the second officer can be controlled by a common control signal. The fifth picture display is unfamiliar with the use of individual drive circuits. The circuit structure of the cold cathode glare lamp is as follows: The second lamp is the 2 series knife and fork circuit 1 3, 1 4 and the transformer 1 5 and 16 driven by the country. Page 5 1220994 5. Description of the invention (2) Movement and control, flowing through the lamp 1 1 2 The currents I η and I! Are fed back to the circuits 1 3 and 1 4 respectively to control the currents I η and I 丨 to a preset fixed value to achieve the same current effect. However, since each lamp needs to be Each tube is provided with a driving and control circuit, which has relatively high component cost and takes up a large space. A technology that is not required to install multiple driving and control circuits uses ballast (bal last ) Components to reduce the current difference between the lamps as much as possible. The sixth figure shows the circuit architecture diagram of the conventional technology using a single drive circuit to drive a plurality of cold cathode fluorescent lamps, which uses two lamps For example, as shown in the figure, two lamps 2 and 22 are connected in parallel. And is driven by a circuit 23 and a transformer 25. The high-voltage ends of the two lamps 22 and 22 are connected in series with a capacitor 27 and 28 as a ballast element (Bal last). Two capacitors 27 and 2 The 8 series has the same impedance, and its impedance value is much larger than the impedance of the lamp 2 and 22, which is enough to make the current I 21 and I 2 经 flowing through the two lamps 2 and 22 are mainly dominated by the capacitance impedance. That is, even when the impedances of the two lamps 2 and 22 are different, the influence on the difference between the currents I 21 and I 2 is very slight and can be ignored. Therefore, the two lamps 22 and 22 driven by a common high-voltage driving source can be adjusted to have similar current values. However, in order to make the current distribution control more accurate, that is, to make the difference between the currents I 21 and I 2 as small as possible, this circuit will have to use a high-impedance ballast element, so an abnormally high driving voltage is required. The generation and processing of high driving voltage is very costly and difficult to achieve, so this method has not been widely used. Another conventional technique does not require multiple drive and control circuits. Differential ballasts (D i f e r en t i a 1 B a 1 1 a s t) are used. First
Γ220994 五、發明說明（3) =圖顯示此種電路架構圖，苴 示，二燈管31、q 9在^、、 ，、係以二燈管為例。如圖所 31、 I 3A間的不 因此，經過修 器35所驅動。二燈管31並聯連接，並由一電路33及一變壓 件39而連接至變32之高壓端係透過一差動鎮流元 一修正電塵，此一^正~==彳。f動鎮流元件39可產生 匹配成比例，並可疊加至_ A :電流 丨τ+广、 至 共同驅動電壓▽ Θ W '、牡取取 I正之驅動電壓，可適當々 丨的八舶。絡缺，、田地5周整燈官之電流121、122，使其平 ^ ir # 1 Μ ^ 確保官之電流達到相等，但 要》又置頜外的電路元件，使其結構較為複雜且增加成 【發明内容】 本發明之目的在於提供一種多燈管驅動電路之變壓 |态’可適用於液晶顯示面板之背光系統中以驅動複數個冷 陰極螢光燈管，或適用於其他類似之應用，其可以簡單且 |低成本之方式，有效地使流經各燈管之電流相等，改善液 晶顯示面板之亮度均勻性，並使各燈管之老化速率趨於— I致。 根據本發明之一態樣，提供一種多燈管驅動電路之變 |壓器，包含：一磁芯，其具有一中柱及複數個侧柱；一一 次側線圈，其係捲繞於該磁芯之中柱，用於電性耦接至一 激磁電源；及複數個二次側線圈’其分別捲繞於複數個側 柱，並分別用於電性耦接至複數個燈管之一端。 根據本發明之另一態樣，提供一種多燈管驅動電路， 包含一激磁電源；一如上述之變塵器’其複數個二次側線 1220994 五、發明說明（4) 圈之第一端係分別電性耦接至複數個燈管之第一端，第二 端則電性耦接至一共同節點；及一鎮流元件，其第一端電 性耦接至共同節點，第二端則電性耦接至複數個燈管之第 二端。 當本發明應用於液晶顯示面板之背光系統中以驅動複 數個冷陰極螢光燈管時，一旦燈管中之電流不相等，即可 感應產生出一修正電流，有效地使各燈管中之電流相等， 達到亮度均勻之效果。 【實施方式】 請參照第一圖，其顯示本發明多燈管驅動電路之變壓 器的第一具體例。此例中所說明者，係為本發明之最簡單 模式，亦即，應用於具有二冷陰極螢光燈管之系統中。如 圖所示，變壓器1 0 0包括一磁芯11 0，其具有一中柱1 0 2及 二侧柱1 0 4與1 0 6。變壓器1 0 0又包括一個一次側線圈11 2捲 繞於中柱1 0 2上，以及包括二個二次側線圈11 4與11 6分別 捲繞於二侧柱1 0 4與1 0 6上。當應用於一冷陰極螢光燈管之 驅動電路中時，一次側線圈1 1 2之二端1 1 2a與1 1 2b係用於 電性耦接至一激磁電源，而，二次側線圈11 4與11 6之一端 則分別用於電性耦接至二燈管之一端。二次側線圈11 4與 1 1 6係具有相同之匝數，並且具有相同之捲繞方向。 第二圖顯示本發明第一具體例之變壓器1 0 0應用於多 燈管驅動電路1 0 0 a中。多燈管驅動電路1 0 0 a係用於驅動二 冷陰極螢光燈管3 0 4與3 0 6，其包含第一圖所示之變壓器 1 0 0、一交流（AC)激磁電源2 0 0、及一電容（鎮流元件）Γ220994 V. Description of the invention (3) = The diagram shows this kind of circuit architecture diagram. It is shown that the two lamps 31, q 9 are in ^,, ,, and the two lamps are taken as an example. As shown in Fig. 31, it is not driven between I 3A by the repairer 35. The two lamps 31 are connected in parallel and connected to the high-voltage end of the transformer 32 by a circuit 33 and a transformer 39. A differential ballast is used to correct the electric dust, which is ^ + ~ == 彳. The f ballast element 39 can be matched proportionally and can be superimposed to _ A: current 丨 τ + wide, to a common driving voltage ▽ Θ W ', and a positive driving voltage of I can be appropriately selected. For the lack of electricity, the current of the lamp officials in the field for 5 weeks is 121, 122, so that it is flat ^ ir # 1 Μ ^ to ensure that the official current is equal, but the circuit components outside the jaw must be placed to make the structure more complex and increase [Summary of the Invention] The object of the present invention is to provide a voltage transformer state of a multi-lamp driving circuit, which can be applied to a backlight system of a liquid crystal display panel to drive a plurality of cold-cathode fluorescent lamps, or other similar similar lamps. It can be used in a simple and low-cost way to effectively equalize the currents flowing through the lamps, improve the uniformity of the brightness of the liquid crystal display panel, and make the aging rate of the lamps tend to be the same. According to an aspect of the present invention, a transformer for a multi-lamp driving circuit is provided, comprising: a magnetic core having a center pillar and a plurality of side pillars; and a primary side coil which is wound around the The middle pole of the magnetic core is used for electrically coupling to an excitation power source; and a plurality of secondary-side coils are respectively wound on the plurality of side poles and are respectively used for electrically coupling to one end of the plurality of lamp tubes. . According to another aspect of the present invention, a multi-lamp driving circuit is provided, which includes an excitation power source; as described above, the dust changer 'has a plurality of secondary side wires 1220994. V. Description of the invention (4) The first end of the loop Electrically coupled to the first end of the plurality of lamps, the second end is electrically coupled to a common node; and a ballast element, the first end of which is electrically coupled to the common node, and the second end is Electrically coupled to the second ends of the plurality of lamps; When the present invention is applied to a backlight system of a liquid crystal display panel to drive a plurality of cold-cathode fluorescent tubes, once the currents in the tubes are not equal, a correction current can be induced by induction, effectively making the The current is equal to achieve the effect of uniform brightness. [Embodiment] Please refer to the first figure, which shows a first specific example of a transformer of a multi-lamp driving circuit according to the present invention. What is described in this example is the simplest mode of the present invention, that is, it is applied to a system having two cold-cathode fluorescent tubes. As shown in the figure, the transformer 100 includes a magnetic core 110, which has a center pillar 102 and two side pillars 104 and 106. The transformer 1 0 0 further includes a primary coil 11 2 wound on the center pillar 10 2, and includes two secondary coils 11 4 and 11 6 wound on the two pillars 1 0 4 and 1 6 respectively. . When applied to the driving circuit of a cold-cathode fluorescent tube, the two ends of the primary-side coil 1 12 2 and 1 1 2b are used to be electrically coupled to an excitation power source, and the secondary-side coil One ends of 11 4 and 11 6 are respectively used to be electrically coupled to one end of the two lamps. The secondary coils 11 4 and 1 1 6 have the same number of turns and the same winding direction. The second figure shows that the transformer 100 of the first embodiment of the present invention is applied to a multi-lamp driving circuit 100a. The multi-lamp driving circuit 1 0 0 a is used to drive two cold-cathode fluorescent lamps 3 0 4 and 3 0 6 and includes a transformer 1 0 0 and an alternating current (AC) excitation power source 2 0 as shown in the first figure. 0, and a capacitor (ballast element)
第8頁 1220994 五、發明說明（5) 4 0 0。如圖所示，變壓器1 0 0之一次側線圈1 1 2的二端11 2 a 與1 1 2b係電性耦接至激磁電源2 0 0，二次側線圈11 4與11 6 之第一端114a與11 6a分別電性耦接至燈管3 04與3 0 6之高壓 端（第一端）304a與3 0 6a，而二次側線圈114與116之第二 端1 1 4b與1 1 6b則電性耦接至一共同節點4 0 2，並經由此而 電性耦接至電容4 0 0之一端。燈管3 0 4與3 0 6之低壓端（第 二端）304b與3 0 6b係電性耦接於一共同節點404，並經由 此而電性耦接至電容4 0 0之另一端，其中，共同節點4 0 4通 常係為接地點。 以下說明第二圖之多燈管驅動電路1 0 0 a的動作原理。 由於一次侧線圈1 1 2的二端1 1 2a與1 1 2b係電性耦接至AC激 磁電源2 0 0，因此，中柱1 〇 2中會產生AC磁通量。磁通量會 順著磁芯1 1 0中之磁路，而分別流經側柱1 0 4與1 0 6再回到 中柱1 0 2，藉此，可將磁通量耦合至二次側，而分別在二 次側線圈1 1 4與11 6上產生感應電壓。二次側線圈11 4上之 感應電壓係用於驅動燈管3 0 4，使得一電流I 3G瘫經燈管 3 0 4，並接著流經電容4 0 0 ;同樣地，二次側線圈1 1 6上之 感應電壓係用於驅動燈管3 0 6，使得一電流I 3G疏經燈管 3 0 6，並接著流經電容4 0 0。 二次側線圈1 1 4與11 6之捲繞方向以及本發明獨特磁結 構之設計，係可使得二次側線圈11 4之第一端的感應電壓 與二次側線圈1 1 6之第一端的感應電壓具有相同相位，亦 即，使得流經燈管3 0 4之電流I 3〇與流經燈管3 0 6之電流I 306 具有相同相位。因此，流經電容4 0 0的電流係為流經燈管 1220994 五、發明說明（6) 3 0 4與3 〇 6之電流I μ與I 3〇妁總和。故，電容4 0 0可做為二燈 管3 0 4與3 0 6之電流總和的鎮流元件，用於調節二燈管總電 流值，以便避免因冷陰極螢光燈管中常見之V -1特徵曲線 不規律特性所造成的總電流值不穩定。 在磁芯1 1 0上，側柱1 0 4與1 0 6可形成一閉磁路。流經 二次側線圈1 1 4與1 1 6之電流可分別使側柱1 〇 4與1 〇 6磁化。 根據本發明之獨特線圈與磁配置，電流I⑽流經二次側線圈 11 4所感應而生的磁動勢，與電流I別流經二次側線圈丨丨6所 感應而生的磁動勢’《一者可互相抵銷。換言之，當二者磁 動勢相等時，側柱i 〇4與1 〇6所形成的閉磁路上不會存在有 淨磁動勢。如先前所述，二次侧線圈n 4與n 6係捲繞相同 的E數，因此，當燈管3 0 4與3 0 6中之電流13()與l3Q相等 時，此一磁路中就不會存在有淨磁動勢。而，當二燈管之 阻抗有差異、或由於其他原因，使得二燈管4與306中之 電流I μ與I 3〇不相等時，此一磁路上就會產生一淨磁動 勢0 由於此一磁路係由磁芯ί丨〇之高導磁率材料所形成， 磁阻很低’ @此：磁動勢可在磁路中產生很高的磁通量。 再者’ 一次側線圈1 1 4與1 1 β之έ且人得且女々一 0心、、、且口係具有很高之線圈匝 數。故’此南磁通置可在高兩齡綠園 两 > 隹回阯數線圈上感應生成很強的反 應電壓（更詳細&之，因磁通量戀彳匕 ^艰里艾化，使得二次側線圈 1 1 4與1 1 6中產生感應電流，此雷泠你甘丄 u 此也肌攸其中一線圈的第一 流入’並從另一線圈的第一戚、户屮，4Λ* + , 女山 表广 ^ /爪出’故在二線圈之組合上 產生一跨壓，即反應電壓。）。士插山 ； 此種由二次側線圈1 1 4與Page 8 1220994 V. Description of the invention (5) 4 0 0. As shown in the figure, the two ends 11 2 a and 1 12 b of the primary side coil 1 1 2 of the transformer 100 are electrically coupled to the excitation power source 2 0 0 and the first side of the secondary side coils 11 4 and 11 6 Terminals 114a and 11 6a are electrically coupled to the high-voltage terminals (first terminal) 304a and 3 0 6a of the lamp tube 3 04 and 3 0 6 respectively, and the second terminals 1 1 4b and 1 of the secondary coil 114 and 116 16b is electrically coupled to a common node 402, and is electrically coupled to one end of the capacitor 400 through this. The low-voltage ends (second ends) 304b and 3 06b of the lamps 3 0 4 and 3 06 are electrically coupled to a common node 404, and are electrically coupled to the other end of the capacitor 4 0 through this, Among them, the common node 4 0 4 is usually a ground point. The operation principle of the multi-lamp driving circuit 100a of the second figure is described below. Since the two terminals 1 12a and 1 12b of the primary coil 1 12 are electrically coupled to the AC excitation power supply 200, an AC magnetic flux is generated in the center pillar 102. The magnetic flux will follow the magnetic circuit in the magnetic core 1 10, flow through the side pillars 104 and 106, and then return to the center pillar 102, respectively. With this, the magnetic flux can be coupled to the secondary side, and Induced voltages are generated in the secondary coils 1 1 4 and 116. The induced voltage on the secondary coil 11 4 is used to drive the lamp tube 3 0, so that a current I 3G paralyzes through the lamp tube 3 0 4 and then flows through the capacitor 4 0 0; similarly, the secondary coil 1 The induced voltage on 16 is used to drive the lamp tube 3 06, so that a current I 3G is passed through the lamp tube 3 0 6 and then flows through the capacitor 4 0 0. The winding direction of the secondary coils 1 1 4 and 11 6 and the unique magnetic structure design of the present invention can make the induced voltage at the first end of the secondary coil 1 4 and the first of the secondary coil 1 1 6 The induced voltages at the terminals have the same phase, that is, the current I 3o flowing through the lamp tube 304 and the current I 306 flowing through the lamp tube 306 have the same phase. Therefore, the current flowing through the capacitor 400 is the sum of the currents I μ and I 300 that flow through the lamp tube 1220994 V. Invention Description (6) 3 0 4 and 3 06. Therefore, the capacitor 400 can be used as a ballast element for the sum of the currents of the two lamps 3 0 4 and 3 6. It is used to adjust the total current of the two lamps, so as to avoid the common V in cold cathode fluorescent lamps. The total current value caused by the -1 characteristic curve is not stable. On the magnetic core 1 10, the side pillars 104 and 106 can form a closed magnetic circuit. The currents flowing through the secondary coils 1 1 4 and 1 16 can magnetize the side pillars 104 and 106, respectively. According to the unique coil and magnetic arrangement of the present invention, the magnetomotive force generated by the current I⑽ flowing through the secondary-side coil 114 is induced by the current I⑽ flowing through the secondary-side coil 丨 6 "" One can offset each other. In other words, when the two magnetomotive forces are equal, there will be no net magnetomotive force on the closed magnetic path formed by the side pillars i 〇 4 and 106. As mentioned earlier, the secondary side coils n 4 and n 6 are wound with the same E number. Therefore, when the current 13 () and l3Q in the lamps 3 0 4 and 3 6 are equal, this magnetic circuit There would be no net magnetomotive force. However, when the impedance of the two lamps is different, or due to other reasons, the current I μ and I 30 in the two lamps 4 and 306 are not equal, a net magnetomotive force will be generated on this magnetic circuit. This magnetic circuit is made of a high permeability material with a magnetic core, and the magnetic resistance is very low. @This: The magnetomotive force can generate a high magnetic flux in the magnetic circuit. Furthermore, the primary side coils 1 1 4 and 1 1 β have a high number of coil turns. Therefore, 'this south magnetic flux placement can induce a strong response voltage on the high two-year green garden two > 隹 return address coils (more detailed & because the magnetic flux is arduous, making the two Inductive currents are generated in the secondary coils 1 1 4 and 1 1 6. This is the first inflow of one of the coils, and the first inflow from one of the coils, and the other, 4Λ * + , Female mountain table wide ^ / claw out 'Therefore, a cross voltage is generated on the combination of the two coils, that is, the reaction voltage.). Shijiashan; this kind of secondary side coil 1 1 4 and
第10頁 1220994 五、發明說明（7) 1 1 6之組合感應生成的高反應電壓，係直接被施加至燈管 3 0 4與3 0 6。又’冷陰極螢光燈管點亮後的動態阻抗相當 低’且其間並^連接任何高阻抗電路元件。因而，高反應 電壓可產生出南修正電流，有效地修正燈管3 〇 4與3 〇 6中的 電流不匹配，使各燈管可具有相同之亮度。 選擇性地’可將一低阻抗元件，例如電流感測電阻， ***每一冷陰極螢光燈管之一端，此點並不會影響反應電 壓的修正效果。Page 10 1220994 V. Description of the invention (7) The high response voltage generated by the combination of 1 1 6 is directly applied to the lamps 3 0 4 and 3 6. "The dynamic impedance of the cold-cathode fluorescent lamp after lighting is quite low", and any high-impedance circuit components are connected in between. Therefore, a high response voltage can generate a south correction current, which effectively corrects the current mismatch in the lamps 3 and 06, so that each lamp can have the same brightness. Optionally, a low-impedance element, such as a current-sensing resistor, can be inserted into one end of each cold-cathode fluorescent tube, which does not affect the correction effect of the reaction voltage.
除了上述之最簡單模式外，本發明亦可應用於更複雜 之結構’例如’應用於具有四冷陰極螢光燈管之系統中。In addition to the simplest mode described above, the present invention can also be applied to more complicated structures such as, for example, a system having a four-cold cathode fluorescent lamp.
請參照第三圖，其顯示本發明多燈管驅動電路之變壓 器之第二具體例。如圖所示，變壓器5 〇 0包括一磁芯5 1 0， 其具有一中柱50 2及四侧柱504、505、506、507。變壓器 5 0 0又包括一個一次侧線圈5 1 2捲繞於中柱5 0 2上，以及包 括四個二次側線圈5 1 4、5 1 5、5 1 6、5 1 7分別捲繞於四側柱 5 0 4、5 0 5、5 0 6、5 0 7。類似於第一具體例，一次側線圈 5 1 2之二端係可電性耦接至一激磁電源，而，二次側線圈 5 1 4、5 1 5、5 1 6、5 1 7之一端則可分別電性耦接至四燈管之 一端。二次側線圈5 1 4、5 1 5、5 1 6、5 1 7係具有相同之匝 數，並且，並且具有相同之捲繞方向。 第四圖顯示本發明第二具體例之變壓器5 0 0應用於多 燈管驅動電路5 0 0 a中。多燈管驅動電路5 0 0 a係用於驅動四 冷陰極螢光燈管704、705、706、707，其包含第三圖所示 之變壓器5 0 0、一交流（AC)激磁電源6 0 0、及一電容（鎮Please refer to the third figure, which shows a second specific example of the transformer of the multi-lamp driving circuit of the present invention. As shown in the figure, the transformer 500 includes a magnetic core 5 10 having a center pillar 502 and four side pillars 504, 505, 506, and 507. Transformer 5 0 0 also includes a primary-side coil 5 1 2 wound on the center pillar 502, and includes four secondary-side coils 5 1 4, 5, 1 5, 5, 1 6, 5 1 7 Four-sided columns 5 0 4, 5, 0 5, 5, 0 6, 5 0 7. Similar to the first specific example, two ends of the primary-side coil 5 1 2 can be electrically coupled to an excitation power source, and one end of the secondary-side coil 5 1 4, 5 1 5, 5 1 6, 5 1 7 They can be electrically coupled to one end of the four lamps respectively. The secondary-side coils 5 1 4, 5 1 5, 5, 1 6 and 5 1 7 have the same number of turns and have the same winding direction. The fourth figure shows that the transformer 500 of the second specific example of the present invention is applied to a multi-lamp driving circuit 500a. The multi-lamp driving circuit 5 0 a is used to drive four cold-cathode fluorescent tubes 704, 705, 706, and 707, and includes a transformer 5 0 0 and an alternating current (AC) excitation power source 6 0 as shown in the third figure. 0, and a capacitor (town
第11頁 1220994 五、發明說明（8) 流元件）8 0 0。如圖所示，類似於圖2之電路，變壓器5 〇 〇 之一次側線圈5 1 2的二端係電性耦接至激磁電源6 〇 〇，二攻 側線圈5 1 4、5 1 5、5 1 6、5 1 7之第一端分別電性耦接至燈管 704、70 5、70 6、70 7之高壓端（第一端），而二次側線圈 5 1 4、5 1 5、5 1 6、5 1 7之第二端則電性耦接至一共同節點 8 02，並經由此而電性耦接至電容8〇〇之一端。燈管7〇”4、 70 5、70 6、70 7之低壓端（第二端）係電性耦接於一丘 節點8 0 4，並經由此而電性耦接至電容8 〇 〇之另_ ^ 管驅動電路5 0 0a的動作原理係類似於第二 ^ ^ π加以瞽诚。 电格，在此 田上迷Page 11 1220994 V. Description of the invention (8) Flow element) 8 0 0. As shown in the figure, similar to the circuit of FIG. 2, the two ends of the primary-side coil 5 12 of the transformer 5000 are electrically coupled to the excitation power source 600, and the secondary-side coils 5 1 4, 5 1 5, The first ends of 5 1 6, 5 1 7 are respectively electrically coupled to the high-voltage ends (first ends) of the lamp tubes 704, 70 5, 70 6, 70 7 and the secondary side coils 5 1 4, 5 1 5 The second terminal of 5 1 6 and 5 1 7 is electrically coupled to a common node 80 2 and is electrically coupled to one terminal of capacitor 800 through this. The low-voltage end (second end) of the lamp tube 70, 4, 70 5, 70 6, 70 7 is electrically coupled to a mound node 8 0 4 and is electrically coupled to the capacitor 8 0 0 through this. In addition, the operation principle of the tube driving circuit 5 0 0a is similar to that of the second ^ ^ π.
用 於任何具有二個或；多二：：富可明白’本發明可 電流不相等時，本發匕：=驅動電路。當燈管中 之，有效地調節燈管意产: 出尚修正電流加以修 雖然本發明已參；到均句-致。 上，惟其應並非為限制t八體例及舉例性附圖敘述如 精神所做之各種修改、，者。熟悉本技藝者根據本發明 圍。 省略及變化，均應屬於本發明之It is used for any device that has two ORs; more than two: rich can understand that the present invention can be used when the currents are not equal: = drive circuit. When the lamp is in the tube, the lamp can be effectively adjusted: the current is corrected to correct it. Although the present invention has been referenced; However, it should not be construed as limiting the eight methods and exemplifying the drawings to describe various modifications such as the spirit. Those skilled in the art will appreciate this invention. Omissions and changes shall belong to the invention
第12頁 1220994 圖式簡單說明 第一圖係為本發明多燈管驅動電路之變壓器之第一具 體例之結構圖； 第二圖顯示本發明第一具體例之變壓器應用於一多燈 管驅動電路中，用以驅動二冷陰極螢光燈管； 第三圖係為本發明多燈管驅動電路之變壓器之第二具 體例之結構圖； 第四圖顯示本發明第二具體例之變壓器應用於一多燈 管驅動電路中，用以驅動四冷陰極螢光燈管； 第五圖係為習知技術採用個別驅動電路來驅動複數個 冷陰極螢光燈管之電路架構圖； 第六圖係為習知技術採用單一驅動電路來驅動複數個 冷陰極螢光燈管之電路架構圖；及 第七圖係為習知技術採用單一驅動電路來驅動複數個 冷陰極螢光燈管之另一種電路架構圖。 【元件符號說明】 11 ： 燈 管 12 燈 管 13 電 路 14 電 路 15 變 壓 器 16 變 壓 器 21 燈 管 22 燈 管 23 電 路 25 變 壓 器 27 鎮 流 元 件 ( 電容） 28 鎮 流 元件（電容） 31 燈 管 32 燈 管 33 電 路 35 變 壓 器 39 差 動 鎮 流 元 件 1 0 0 :變壓器Page 1212994 Brief description of the diagram The first diagram is a structural diagram of the first specific example of the transformer of the multi-lamp driving circuit of the present invention; the second diagram shows that the transformer of the first specific example of the present invention is applied to a multi-lamp driving In the circuit, it is used to drive two cold-cathode fluorescent tubes; the third figure is a structural diagram of the second specific example of the transformer of the multi-lamp driving circuit of the present invention; the fourth figure shows the transformer application of the second specific example of the present invention In a multi-lamp driving circuit, it is used to drive four cold-cathode fluorescent lamps. The fifth diagram is a circuit structure diagram of a conventional technique using individual driving circuits to drive a plurality of cold-cathode fluorescent lamps. The sixth diagram is It is a circuit structure diagram of the conventional technology using a single driving circuit to drive a plurality of cold cathode fluorescent tubes; and the seventh diagram is another conventional technique using a single driving circuit to drive a plurality of cold cathode fluorescent tubes. Circuit architecture diagram. [Description of component symbols] 11: lamp tube 12 lamp tube 13 circuit 14 circuit 15 transformer 16 transformer 21 lamp tube 22 lamp tube 23 circuit 25 transformer 27 ballast element (capacitance) 28 ballast element (capacitance) 31 lamp tube 32 lamp tube 33 circuit 35 transformer 39 differential ballast element 1 0 0: transformer
第13頁 1220994 圖式簡單說明 1 0 0 a :多燈管驅動 電路 102 ： 中柱 104 ： 側柱 106: 側柱 110 : 磁芯 112: 一次側線圈 112a: —次側線圈 之第 一端 112b: —次側線圈之第二端 114: 二次側線圈 114a:二次側線圈之第一端 114b:二次側線圈 之第二端 116: 二次側線圈 116a:二次側線圈之第 一端 116b:二次側線圈之第二端 200 激磁電源 304 燈管 306 燈管 400 電容 402 節點 404 節點 500 變壓器 500a:多燈管驅動電路 502 中柱 504 側柱 505 側柱 506 側柱 507 側柱 510 磁芯 512 一次側線圈 514 二次側線圈 515 二次側線圈 516 二次側線圈 517 二次側線圈 600 激磁電源 704 燈管 705 燈管 706 燈管 707 燈管 800 電容 802 節點 8 0 4 :節點1220994 on page 13 Brief description of the diagram 1 0 0 a: Multi-lamp driving circuit 102: center pillar 104: side pillar 106: side pillar 110: magnetic core 112: primary coil 112a:-the first end 112b of the secondary coil : —Second side coil 114: secondary side coil 114a: secondary side coil 114b: secondary side coil 116: secondary side coil 116a: secondary side coil first Terminal 116b: the second end of the secondary coil 200, excitation power source 304, lamp tube 306, lamp tube 400, capacitor 402, node 404, node 500, transformer 500a: multi-lamp driving circuit 502 center column 504 side column 505 side column 506 side column 507 side column 510 core 512 primary coil 514 secondary coil 515 secondary coil 516 secondary coil 517 secondary coil 600 excitation power source 704 lamp tube 705 lamp tube 706 lamp tube 707 lamp tube 800 capacitor 802 node 8 0 4: node
第14頁Page 14
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW92127456A TWI220994B (en) | 2003-10-03 | 2003-10-03 | Transformer for driving multiple lamps |
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| TW92127456A TWI220994B (en) | 2003-10-03 | 2003-10-03 | Transformer for driving multiple lamps |
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| TW200514107A TW200514107A (en) | 2005-04-16 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7274156B2 (en) | 2005-05-03 | 2007-09-25 | Darfon Electronics Corp. | Power supply circuit and transformer thereof |
| US11195655B2 (en) | 2018-10-24 | 2021-12-07 | Analog Devices International Unlimited Company | Segmented winding techniques for a coupled inductor circuit |
| US11430600B2 (en) | 2020-04-17 | 2022-08-30 | Analog Devices International Unlimited Company | Segmented winding center-tap techniques for a coupled inductor circuit |
| US11574766B2 (en) | 2020-04-17 | 2023-02-07 | Analog Devices International Unlimited Company | Techniques for a coupled inductor circuit |
-
2003
- 2003-10-03 TW TW92127456A patent/TWI220994B/en not_active IP Right Cessation
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7274156B2 (en) | 2005-05-03 | 2007-09-25 | Darfon Electronics Corp. | Power supply circuit and transformer thereof |
| US7385358B2 (en) | 2005-05-03 | 2008-06-10 | Darfon Electronics Corp. | Power supply circuit and transformer thereof |
| US11195655B2 (en) | 2018-10-24 | 2021-12-07 | Analog Devices International Unlimited Company | Segmented winding techniques for a coupled inductor circuit |
| US11430600B2 (en) | 2020-04-17 | 2022-08-30 | Analog Devices International Unlimited Company | Segmented winding center-tap techniques for a coupled inductor circuit |
| US11574766B2 (en) | 2020-04-17 | 2023-02-07 | Analog Devices International Unlimited Company | Techniques for a coupled inductor circuit |
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| Publication number | Publication date |
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| TW200514107A (en) | 2005-04-16 |
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