M360424 五、新型說明： 【新型所屬之技術領域】 本新型涉及光源驅動裝置，尤其涉及一種液晶屏光源 驅動裝置。 * 【先前技術】 通常’冷陰極榮光燈（c〇ld cath〇de Fluorescent Lamps， s)或者外電極螢光燈（Externai Eiectr〇de • Fluorescent LamPs，eefls )用作平面顯示裝 置LCD模組的 背光源，例如：液晶顯示器、等離子顯示面板等。在lcd 模組中’通常會先藉由直流/交流轉換電路將直流轉換為交 /；，L再藉由換流變壓器（Converter Tranformer )將交流變 左，然後藉由逆變變麗器（InverterTransf〇rmer)供電給燈 管。 在現有的光源驅動裝置中，一般採用傳統式換流變壓 參ϋ來實現隔離與升壓。然而，傳統式換流變壓器往往因繞 線多而導致厚度大，不易做到小型化的需求。比如，常見 的32寸逆變變壓器厚度為9毫米，而常見的換流變壓器則 達20耄米或25毫米。同時，當顯示裝置的尺寸增加時， 垃g的電壓也隨之增加，這時，逆變變壓器的圈比也要相 應增加。增加的圈比會造成逆變變壓器的銅損增加，效率 •下降。而且，若現有線槽無法繞下所有圈數，則需加大逆 變變壓器，不利於產品小型化的需求。 4 M360424 【新型内容】 有鑒於此，有必要提供一種光源驅動裝置，其具有較 小的體積。 一種光源驅動裝置，用於驅動光源，包括直流/交流轉 換電路、至少兩個隔離變壓器及諧振平衡電路。直流/交流 . 轉換電路用於將接收到的直流訊號轉換為第一交流訊號。 兩個隔離變壓器的初級繞組並行連接，且與該直流/交流轉 φ 換電路相連，其次級繞組串行連接，用於隔離該第一交流 訊號中的直流成分，並將該第一交流訊號轉換為第二交流 訊號。諧振平衡電路連接於該等至少兩個隔離變壓器次級 繞組之間，用於將該第二交流訊號轉換為可驅動該光源的 電訊號。 一種光源驅動裝置，用於驅動光源，包括至少兩個直 流/交流轉換電路、至少兩個隔離變壓器及諧振平衡電路。 φ 兩個直流/交流轉換電路均用於將接收到的直流訊號轉換 為第一交流訊號。兩個隔離變壓器的初級繞組分別與該等 至少兩個直流/交流轉換電路——連接，次級繞組串行連 接，用於隔離該第一交流訊號中的直流成分，並將該第一 交流訊號轉換為第二交流訊號。諧振平衡電路連接於該等 至少兩個隔離變壓器的次級繞組之間，用於將該第二交流 訊號轉換為可驅動該光源的電訊號。 本創作所提供的光源驅動裝置採用了至少兩個隔離變 5 M360424 壓器，並將該等至少兩個隔離變壓器的初級侧並行連接， 次級側串連，這種方式使得單個隔離變壓器的圈數減小， 從而減小了其厚度，進而使得本創作所提供的光源驅動裝 置具有更小的體積。 【實施方式】 圖1所示為本新型光源驅動裝置一實施方式之結構示 意圖。光源驅動裝置用於驅動光源30。本實施方式中，光 φ 源30包括複數燈管32、34 ..... 36、38，如燈管1、燈管 2 —直到燈管N-1、燈管N，其中，N為燈管個數。 在本實施方式中，光源驅動裝置包括直流/交流轉換電 路10、至少兩個隔離變壓器、諳振平衡電路20。在本實施 方式中，僅以隔離變壓器T1與T2為例來說明。 直流/交流轉換電路10用於將接收的直流訊號轉換為 第一交流訊號Vp。在本實施方式中，直流/交流轉換電路 φ 10輸出的第一交流訊號Vp為方波訊號。在本實施方式中， 直流/交流轉換電路10可以為全橋式架構（Full-Bridge)、 半橋式架構（Half-Bridge)、推挽式架構（Push-Pull)或是 自激式（Royer )架構。 隔離變壓器ΤΙ、T2與直流/交流轉換電路10相連，用 於隔離直流/交流轉換電路10所輸出的第一交流訊號Vp中 的直流成分，並將第一交流訊號Vp升壓為第二交流訊號 Vs。在本實施方式中，隔離變壓器T1與T2的初級繞組並 6 M3 60424 行連接且與直流/交流轉換電路ίο相連，次級繞組串行連 接且與諧振平衡電路20相連。在本實施方式中，隔離變壓 器T1與T2包括換流變壓器。在本實施方式中，隔離變壓 器T1與T2的輸出可調整。隔離變壓器T1與T2將交流電 源與諧振平衡電路20及光源30隔離開來，使得光源30及 驅動光源30的諧振平衡電路20處於安全狀態，以符合安 規規定。在本實施方式中，隔離變壓器T1與T2因為次級 φ 繞組串行連接，所以還具有升壓的功能。 諧振平衡電路20連接於隔離變壓器T1與T2的次級 繞組之間，用於將隔離變壓器T1與T2所輸出的第二交流 訊號Vs轉換為可驅動光源30的第三交流訊號Vlamp，並平 衡流經光源30的複數燈管32、34 ..... 36、38的電流。 本實施方式中，諧振平衡電路20所輸出的第三交流訊號 Vlamp經整流後為弦波訊號。 • 在本實施方式中，諧振平衡電路20包括複數逆變變壓 器22 ..... 24。逆變變壓器22 ..... 24的初級繞組與隔 離變壓器T1與T2的次級繞組串行連接，其次級繞組與燈 管32、34、…、36、38連接，輸出可驅動光源30的電訊 號至燈管32、34、…、36、38。一般在燈管尺寸較長時， 會需要較高的燈管電壓，因此就要增加諧振平衡電路20中 的逆變變壓器22 ..... 24的圈數比，圈數比高，則銅線損 失與產生的溫度也高。然，在本實施方式中，利用隔離變 7 M3 60424 壓器T1與T2的次級繞組串行連接，可使得諧振平衡電路 20中的逆變變壓器22、…、24的初級繞組電壓提高，因 而不用增加逆變變壓器22 ..... 24的圈數比亦可達到燈管 電壓增加的目的。同時，逆變變壓器22、…、24可以做成 固定的圈數比，從而不同的燈管只需要調整隔離變壓器T1 與T2次級繞組之電壓（Vs)，就能得到所需的電壓。這樣的 設計使得諧振平衡電路20易於設計與製作。 φ 在本實施方式中，光源驅動裝置還包括調光電路40。 調光電路40與直流/交流轉換電路10電性相連，用於根據 接收到的調光訊號與光源迴授電流來控制直流/交流轉換 電路10的輸出以調整流經光源30的電流。 在本實施方式中，因光源驅動裝置包括至少兩個隔離 變壓器T1與T2,使得輸入每一個隔離變壓器的電流變小， 進而減小隔離變壓器T1與T2的厚度與銅損，達到減小光 • 源驅動裝置的體積的效果。同時，隔離變壓器T1與T2的 次級侧串行連接，使得更加容易提高第二交流訊號vs，並 使得輸入逆變變壓器22 ..... 24的電壓變小，從而使得所 使用的逆變變壓器22 ..... 24的耐壓更小，更容易製造。 圖2為本新型光源驅動裝置另一實施方式的結構示意 圖。本實施方式中的光源驅動裝置與圖1中的光源驅動裝 . 置大致相同，不同之處僅在於本實施方式中的光源驅動裝 置包括至少兩個直流/交流轉換電路10、12,分別與至少兩 8 M360424 、、/:離支[器T1、T2的初級側一-相連。詳而言之 :’:抓轉換電路10與隔離變壓器τι的初級側相連，直流 乂机轉換電路12與隔離變壓器Τ2的初級側相連。 、“在本貫財式中，因光源驅動裝置還包括至少兩個直 机/又机轉換電路1〇、12，使得可以在採用光源％的顯示 裝置增加尺寸時，即增加燈管個數時，不需大幅增加逆變 ’憂壓益22、··.、24的圈比，從而更利於逆變變壓器22.....M360424 V. New description: [New technical field] The present invention relates to a light source driving device, and more particularly to a liquid crystal screen light source driving device. * [Prior Art] Usually 'c〇ld cath〇 de Fluorescent Lamps' (s) or external electrode fluorescent lamps (Externai Eiectr〇de • Fluorescent LamPs, eefls) are used as backlights for LCD modules of flat panel displays. Sources such as liquid crystal displays, plasma display panels, and the like. In the LCD module, 'DC is usually converted to AC by DC/AC conversion circuit; L is converted to left by Converter Tranformer, and then inverted by inverter (InverterTransf) 〇rmer) supplies power to the lamp. In the conventional light source driving device, the conventional commutation transformer is generally used for isolation and boosting. However, the conventional converter transformer often has a large thickness due to a large number of windings, and it is difficult to achieve miniaturization. For example, a common 32-inch inverter transformer has a thickness of 9 mm, while a common converter transformer has a thickness of 20 mm or 25 mm. At the same time, as the size of the display device increases, the voltage of the g g increases, and at this time, the turn ratio of the inverter transformer also increases accordingly. The increased ring ratio will increase the copper loss of the inverter transformer and reduce the efficiency. Moreover, if the existing trunking cannot bypass all the turns, it is necessary to increase the reverse transformer, which is not conducive to the demand for miniaturization of the product. 4 M360424 [New content] In view of this, it is necessary to provide a light source driving device which has a small volume. A light source driving device for driving a light source, comprising a DC/AC conversion circuit, at least two isolation transformers, and a resonance balancing circuit. DC/AC. The conversion circuit is used to convert the received DC signal into the first AC signal. The primary windings of the two isolation transformers are connected in parallel and connected to the DC/AC conversion circuit, and the secondary windings are connected in series to isolate the DC component in the first AC signal and convert the first AC signal For the second exchange signal. A resonant balance circuit is coupled between the secondary windings of the at least two isolation transformers for converting the second alternating current signal into an electrical signal that can drive the light source. A light source driving device for driving a light source, comprising at least two DC/AC conversion circuits, at least two isolation transformers, and a resonance balance circuit. φ Two DC/AC conversion circuits are used to convert the received DC signal into the first AC signal. The primary windings of the two isolation transformers are respectively connected to the at least two DC/AC conversion circuits, and the secondary windings are serially connected to isolate the DC component in the first AC signal, and the first AC signal is Convert to the second AC signal. A resonant balance circuit is coupled between the secondary windings of the at least two isolation transformers for converting the second alternating current signal into an electrical signal that can drive the light source. The light source driving device provided by the present invention adopts at least two isolation transformers 5 M360424, and connects the primary sides of the at least two isolation transformers in parallel, and the secondary side is connected in series, which makes the ring of the single isolation transformer The number is reduced, thereby reducing its thickness, which in turn allows the light source driving device provided by the present invention to have a smaller volume. [Embodiment] Fig. 1 is a view showing the configuration of an embodiment of a novel light source driving device. A light source driving device is used to drive the light source 30. In the present embodiment, the optical φ source 30 includes a plurality of lamps 32, 34 ..... 36, 38, such as a lamp tube 1, a lamp tube 2 - until the lamp tube N-1, the lamp tube N, wherein N is a lamp The number of tubes. In the present embodiment, the light source driving device includes a DC/AC conversion circuit 10, at least two isolation transformers, and a resonance balance circuit 20. In the present embodiment, only the isolation transformers T1 and T2 will be described as an example. The DC/AC conversion circuit 10 is configured to convert the received DC signal into a first AC signal Vp. In the present embodiment, the first alternating current signal Vp outputted by the direct current/alternating current converting circuit φ 10 is a square wave signal. In this embodiment, the DC/AC conversion circuit 10 can be a full-bridge (Full-Bridge), a half-bridge (Half-Bridge), a push-pull architecture (Push-Pull), or a self-excited (Royer). ) Architecture. The isolation transformer ΤΙ, T2 is connected to the DC/AC conversion circuit 10 for isolating the DC component of the first AC signal Vp outputted by the DC/AC conversion circuit 10, and boosting the first AC signal Vp to the second AC signal. Vs. In the present embodiment, the isolation transformers T1 are connected to the primary winding of T2 and connected to the DC/AC conversion circuit, and the secondary windings are connected in series and connected to the resonance balancing circuit 20. In the present embodiment, the isolating transformers T1 and T2 include a converter transformer. In the present embodiment, the outputs of the isolating transformers T1 and T2 are adjustable. The isolation transformers T1 and T2 isolate the AC power source from the resonance balancing circuit 20 and the light source 30 such that the source 30 and the resonant balancing circuit 20 of the driving source 30 are in a safe state to comply with safety regulations. In the present embodiment, the isolation transformers T1 and T2 have a boost function because the secondary φ windings are connected in series. The resonant balance circuit 20 is connected between the secondary windings of the isolating transformers T1 and T2 for converting the second alternating current signal Vs outputted by the isolating transformers T1 and T2 into a third alternating current signal Vlamp that can drive the light source 30, and balancing the flow. The current through the plurality of lamps 32, 34 ..... 36, 38 of the light source 30. In this embodiment, the third alternating current signal Vlamp outputted by the resonant balancing circuit 20 is rectified into a sine wave signal. • In the present embodiment, the resonance balancing circuit 20 includes a plurality of inverter transformers 22 ..... The primary winding of the inverter transformer 22 ..... 24 is connected in series with the secondary winding of the isolation transformers T1 and T2, and the secondary winding is connected to the lamps 32, 34, ..., 36, 38, and the output of the driveable light source 30 is The electrical signal is to the lamps 32, 34, ..., 36, 38. Generally, when the lamp tube size is long, a high lamp voltage is required, so it is necessary to increase the number of turns of the inverter transformer 22 ..... 24 in the resonance balance circuit 20, and the number of turns is high, then copper Line losses and temperatures are also high. However, in the present embodiment, by using the isolation transformer 7 M3 60424 voltage regulator T1 and the secondary winding of T2 to be connected in series, the primary winding voltage of the inverter transformers 22, ..., 24 in the resonance balancing circuit 20 can be increased, thereby It is not necessary to increase the number of turns of the inverter transformer 22 ..... 24 to achieve the purpose of increasing the voltage of the lamp. At the same time, the inverter transformers 22, ..., 24 can be made to have a fixed turns ratio, so that different lamps only need to adjust the voltage (Vs) of the secondary windings of the isolation transformers T1 and T2 to obtain the required voltage. Such a design makes the resonant balancing circuit 20 easy to design and manufacture. φ In the present embodiment, the light source driving device further includes a dimming circuit 40. The dimming circuit 40 is electrically coupled to the DC/AC converting circuit 10 for controlling the output of the DC/AC converting circuit 10 to adjust the current flowing through the light source 30 based on the received dimming signal and the source feedback current. In the present embodiment, since the light source driving device includes at least two isolation transformers T1 and T2, the current input to each of the isolation transformers is reduced, thereby reducing the thickness and copper loss of the isolation transformers T1 and T2, thereby reducing the light. The effect of the volume of the source drive. At the same time, the isolation transformers T1 and T2 are connected in series on the secondary side, so that it is easier to increase the second alternating current signal vs. and the voltage of the input inverter transformers 22... 24 becomes smaller, thereby making the inverter used. The transformer 22 ..... 24 has a lower withstand voltage and is easier to manufacture. Fig. 2 is a schematic view showing the structure of another embodiment of the light source driving device of the present invention. The light source driving device in the present embodiment is substantially the same as the light source driving device in FIG. 1 except that the light source driving device in the present embodiment includes at least two DC/AC converting circuits 10 and 12, respectively and at least Two 8 M360424, , /: off the branch [the first side of the T1, T2 - connected. In detail: ': the catching conversion circuit 10 is connected to the primary side of the isolating transformer τι, and the DC down converter circuit 12 is connected to the primary side of the isolating transformer Τ2. "In the present financial mode, since the light source driving device further includes at least two straight/hero conversion circuits 1", 12, so that when the size of the display device using the light source % is increased, that is, when the number of lamps is increased There is no need to increase the loop ratio of the inverter '22.··., 24, which is more conducive to the inverter transformer 22.....
24的設計與製作。 【圖式簡單說明】 圖1為本新型光源驅動裝置- -實施方式的結構示意 圖。 圖2為本新型光源驅動裝置另 一實施方式的結構示意 圖。 【主要元件符號說明】 直流/交流轉換電路 10、12 隔離變壓器 Tl、Τ2 譜振平衡電路 20 逆變變壓器 22、24 光源 30 燈管1 32 燈管2 34 燈管Ν-1 36 燈管Ν 38 40 M360424 調光電路24 design and production. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing the structure of an embodiment of a novel light source driving device. Fig. 2 is a schematic view showing the structure of another embodiment of the light source driving device of the present invention. [Main component symbol description] DC/AC conversion circuit 10, 12 Isolation transformer Tl, Τ2 Spectral balance circuit 20 Inverter transformer 22, 24 Light source 30 Lamp 1 32 Lamp 2 34 Lamp Ν-1 36 Lamp Ν 38 40 M360424 dimming circuit
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