M398134 五、新型說明： 【新型所屬之技術領域】 本創作係關於一種LED背光源驅動模組，尤指一種具 有均习荖流fe出之LED背光源驅動模組。 【先前技術】 目前’大尺寸LCD顯示裝置所使用的背光源已漸漸導 入LED光源作為其背光源，且因LED光源不含汞等重金屬· ，更為環保及省電。據統計，2〇〇9年全球大尺寸LCD顯示鑫 t置所使兩的背光源當中，LED背光源的渗透率約為3%擊 ’且2010年更是上看20%。 目’ΐι LED筲圮源大致可分為直下式及側光式。直下式 w優贴在於可配合視訊作局部調光，以達最佳省電、極高 的動態對比及良好的顯示色域等，相對的，則需要使甬較 多的LED以及較為複雜的驅動模組。而側光式的優點在於 :以製作薄型化的LCD顯示裝置，以及較少的LED及較簡 單的驅動模'组，因此成本較低，相對的，則無法做到二維秦 局部調光，且其動態對比也較差。 .· 卜習知側光式的LED背光源之驅動模組大致上區分為如. 第-圖所示之使職流-直流轉換電路來達晴複數個⑽ · 光條（LED light bar)的均流驅動功能，或是如第二圖所 不之使用線性穩流電路來達到對複數個LED光條的均流驅 動功能。 如第-圖所示’習知的LED背光源之驅動模幻〇為利 用-電源電路19之隔離變遷電路J2將主電源2 j之主電源 訊號進行-次的電壓轉換，再透過整流濾波電路13之^ 4/18 M398134 及濾波，產生驅動電源訊號。並將驅動電源訊號分別透過 複數個直流-直流轉換電路16進行二次的電壓轉換，以適 合於驅動複數個LED光條17發光，最後再藉由脈寬調變調 光暨回授電流偵測電路18以調整發光亮度及產生一回授電 流訊號。藉著回授電路14及脈寬調變控制電路15進行回 授控制，以穩定電源電路19的驅動電源訊號。 使闬直流-直流轉換電路16來驅動複數個LED光條（ LED light bar)的驅動模組10，當增加LED光條17的數 量，同時也需增加相同數量之直流-直流轉換電路16，造成 成本及電路板使兩面積的增加。並且，若直流-直流轉換電 路16的操作頻率未與主電源11同步，則很容易產生干擾 問題。另外，直流-直流轉換電路16亦會產生額外的·電磁 波幅射干擾。 如第二圖所示，習知之LED背光源之驅動模組20具有 與第一圖所示之驅動模組10相似的架構，差異點在於：利 闬線性穩流暨脈寬調變調光電路21取代直流-直流轉換電 路16及脈寬調變調光暨回授電流偵測電路18。 再者，該驅動模組20當LED光條17的個別差異較大 時，採用線性穩流暨脈寬調變調光電路21的附加損耗會變 高。若是LED光條17所串聯之LED晶粒數增加時，每個線 性穩流暨脈寬調變調光電路21所消耗的功率也隨之增加， 並產生大量的廢熱，需要額外的散熱片以進行散熱才能維 持正常運作。因此，為了讓散熱片能有最佳的散熱效率， LED光條17所串聯之LED數量即有一上限，以避免線性穩 流暨脈寬調變調光電路21因過熱而燒毀或失效。 5/18 M398134 【新型内容】 本創作提供一種LED背光源驅動模組，其利用 個第二隔離變壓電路的初級侧繞組相互串聯的方式 其利用將複數 的方式，以達 到均流的目的。 & 本創作提供一種LED背光源驅動模組，其利用一某底 電壓電路，提供-具有負值糕準位之基底電壓，⑽低 第二隔離變壓電路所需產生之第二驅動訊號的正值電^準 根據本創作實施例，提供一種LED背光源驅動模袓， 以驅動複數個LED光條，該驅動模組包括：一主電源， 產生一電源訊號；一第一級隔離變壓單元，與該主電源麵 接，接收該電源訊號，並據以輸出一第一驅動訊號；_ =M398134 V. New Description: [New Technology Field] This creation is about an LED backlight drive module, especially an LED backlight drive module with a uniform flow. [Prior Art] At present, the backlight used in the large-size LCD display device has gradually introduced the LED light source as its backlight, and since the LED light source does not contain heavy metals such as mercury, it is more environmentally friendly and power-saving. According to statistics, among the two backlights in the world's large-size LCD display, the penetration rate of LED backlights is about 3% hits in 2010 and 20% in 2010. The head ΐι LED source can be roughly divided into direct type and side light type. The straight-down type w is suitable for local dimming with video for optimal power saving, high dynamic contrast and good display color gamut. In contrast, more LEDs and more complicated drivers are needed. Module. The side-light type has the advantages of: making a thin LCD display device, and fewer LEDs and a simpler driving mode group, so the cost is lower, and the two-dimensional Qin local dimming cannot be achieved. And its dynamic contrast is also poor. The driving module of the sidelight type LED backlight is roughly divided into the current flow-DC conversion circuit shown in Fig. - to achieve a plurality of (10) · LED light bar current sharing The driving function, or the linear steady current circuit as shown in the second figure, is used to achieve the current sharing function of the plurality of LED strips. As shown in the figure - the conventional LED backlight driving mode is the use of the - power supply circuit 19 isolation transition circuit J2 to the main power supply 2 j main power signal - voltage conversion, and then through the rectification filter circuit 13^4/18 M398134 and filtering to generate drive power signals. And driving the power signal through a plurality of DC-DC conversion circuits 16 for secondary voltage conversion, so as to be suitable for driving a plurality of LED strips 17 to emit light, and finally by pulse width modulation dimming and feedback current detecting circuit 18 to adjust the brightness of the light and generate a feedback current signal. The feedback control is performed by the feedback circuit 14 and the pulse width modulation control circuit 15 to stabilize the driving power signal of the power supply circuit 19. When the DC-DC conversion circuit 16 is driven to drive a plurality of LED light bar drive modules 10, when the number of LED light bars 17 is increased, the same number of DC-DC conversion circuits 16 are also required to be added, resulting in The cost and board make the two areas increase. Further, if the operating frequency of the DC-DC converting circuit 16 is not synchronized with the main power source 11, the interference problem is likely to occur. In addition, the DC-DC conversion circuit 16 also generates additional electromagnetic radiation interference. As shown in the second figure, the conventional LED backlight driving module 20 has a similar architecture to the driving module 10 shown in the first figure, and the difference lies in: the linear steady current and the pulse width modulation dimming circuit 21 The DC-DC conversion circuit 16 and the pulse width modulation dimming and feedback current detecting circuit 18 are replaced. Moreover, when the individual differences of the LED strips 17 are large in the driving module 20, the additional loss of the linear steady current and pulse width modulation dimming circuit 21 becomes higher. If the number of LED crystal chips connected in series by the LED strip 17 is increased, the power consumed by each linear steady current and pulse width modulation dimming circuit 21 is also increased, and a large amount of waste heat is generated, and an additional heat sink is required for the operation. Cooling can maintain normal operation. Therefore, in order to allow the heat sink to have the best heat dissipation efficiency, the number of LEDs connected in series by the LED strip 17 has an upper limit to prevent the linear current and the pulse width modulation dimming circuit 21 from being burned or failed due to overheating. 5/18 M398134 [New Content] This creation provides an LED backlight drive module that utilizes the primary side windings of a second isolated transformer circuit in series with each other to utilize the multiplicative approach to achieve current sharing. & The present invention provides an LED backlight driving module that uses a certain bottom voltage circuit to provide a substrate voltage having a negative value, and (10) a second driving signal required to generate a second isolation transformer circuit. According to the present embodiment, an LED backlight driving module is provided to drive a plurality of LED strips, the driving module comprising: a main power source to generate a power signal; and a first level isolation transformer The unit is connected to the main power source, receives the power signal, and outputs a first driving signal according to the signal; _ =
第二級隔離變壓單元與該第一級隔離變壓單元的苐—次够 倒繞組並聯，並根據該第—驅動峨，於複數個第二隔離 變壓電路各自之次級側繞組產生對應之一第二驅動訊號； 以及複數個整流濾波電路，分別與對應之該第二隔離變壓 電路次級财組減，以將職之鮮二,_訊號進行整 流及濾波，並驅動各自對應耦接之該複數個LED光條。 根據本創作實施例，提供一種LED背光源驅動模組， 以驅動複數個LED光條，該驅動模組包括：一主電源， 產生一電源號，一第一級隔離變壓單元，與該主電源耦 接以接收δ亥電源訊號，並藉由一第一次級側繞組感應一第 一驅動5fL號，一第二級隔離變壓單元，具有複數個第二隔 離變壓電路，且該第二級隔離變壓單元與該第一級隔離變 6/18 M398134 壓單元的苐一次級側繞組並聯，根據該第一驅動訊號，於 複數個第二隔離變壓電路各自的次級側繞組產生對應之一 第二驅動訊號；複數個整流濾波電路，分別與對應之該第 二隔離變壓電路的次級側繞組耦接，以將對應之該第二驅 動訊號進行整流及濾波，並施加於各自對應耦接之該複數 個LED光條之一側；以及一基底電壓電路，藉由該第一級 隔離變壓單元之一第二次級側繞組之一負電壓端感應一基 底電壓訊號’並耦接於該複數個LED光條之另一側，以與 該第二驅動訊號驅動該複數個LED光條。 根據本創作實施例，提供一種LED背光源驅動模組， 以驅動複數個LED光條’該驅動模組包括：一主電源，. 產生一電源訊號；一第一級隔離變壓單元，與該主電.源耦 接，接收該電源訊號，並據以輸出一第一驅動訊號；一第 二級隔離變壓單元，具有複數個第二隔離變壓電路，複數 個第二隔離變壓電路各自的初級側繞組為相互串聯，並與 6玄第一級隔離變壓單元的一第—次級侧繞組並聯，並根據 5亥第一驅動訊號，於複數個第二隔離變壓電路各自之次級 I心、、且產生對應之一第二驅動訊號；複數個整流渡波電路 ，分別與對應之該第二隔離變壓電路的次級側繞組耦接， 以將對應之該第二驅動訊號進行整流及濾波 ’並施加於各The second-stage isolation transformer unit is connected in parallel with the 够-secondary reverse winding of the first-stage isolation transformer unit, and corresponding to the secondary side windings of each of the plurality of second isolation transformer circuits according to the first-stage driving 峨a second driving signal; and a plurality of rectifying and filtering circuits, respectively corresponding to the second isolation transformer circuit secondary sub-group reduction, to rectify and filter the service, and drive the respective coupling The plurality of LED strips are connected. According to an embodiment of the present invention, an LED backlight driving module is provided to drive a plurality of LED light strips, the driving module comprising: a main power source, generating a power source number, a first level isolation transformer unit, and the main The power source is coupled to receive the δ hai power signal, and the first secondary side winding senses a first driving 5fL number, the second stage isolating the voltage transforming unit, and has a plurality of second isolated transformer circuits, and the The second isolation transformer unit is connected in parallel with the first-stage side winding of the first stage isolation transformer 6/18 M398134 voltage unit, and is generated according to the first driving signal in the secondary side windings of each of the plurality of second isolation transformer circuits Corresponding to one of the second driving signals; the plurality of rectifying and filtering circuits are respectively coupled to the secondary side windings of the corresponding second isolated transformer circuit to rectify and filter the corresponding second driving signals, and apply to One side of the plurality of LED strips respectively coupled to each other; and a base voltage circuit for sensing a base voltage signal by a negative voltage terminal of one of the second secondary side windings of the first stage isolation transformer unit And coupled to the other side of the plurality of LED strips to drive the plurality of LED strips with the second driving signal. According to the present embodiment, an LED backlight driving module is provided to drive a plurality of LED light strips. The driving module includes: a main power source, generating a power signal; a first level isolation transformer unit, and the The main power source is coupled to receive the power signal and output a first driving signal; a second-stage isolation transformer unit having a plurality of second isolation transformer circuits and a plurality of second isolation transformer circuits The primary side windings are connected in series with each other, and are connected in parallel with a first-secondary winding of the 6th first-stage isolation transformer unit, and according to the 5th first driving signal, respectively, in the second plurality of isolation transformer circuits Level I, and corresponding to a second driving signal; a plurality of rectifying wave circuits respectively coupled to the secondary side windings of the corresponding second isolated transformer circuit to perform corresponding second driving signals Rectification and filtering' and applied to each
自對應耦接之該複數個光條之一側；以及一基底電壓 電路，藉由該第一級隔離變壓單元之一第二次級側繞組之 一負電壓端感應一基底電壓訊號，並耦接於該複數個LED 光條之另一側，以與該第二驅動訊號驅動該複數個LED光 條。 本創作提供一種LED背光源驅動模組，其主要優點： 7/18 M398134 1、 比習知電路架構有更高的電源轉換效率。 2、 可降低電路的設計成本。 3、 由於採用變壓電路做電流彳衡，所以不會有額外的 率造成£MI輻射干擾的問題。 、 4、 不需使用額外的散熱片。 5、 電路的複雜度與LED光條內之LED晶粒數無關。 6、 LED光條的均流能力極佳。 以上之概述與接下來的詳細說明及附圖，皆是為气 進一步說明本創作為達成預定目的所採取之方式、手^吨 功效。而有關本創作的其他目的及優點，將在 ^及 及圖式中加以闡述。 ㈣明 【實施方式】 如第二圖所示，為本創作第一實施例之LED背、ί «力模組30，具有主電源u、第―級隔轉壓單元=、白 ^隔離^單元、複數個整流《波電路33、複數個 i、34、脈寬機調光暨回授電越測魏35、—個 路36及一個脈寬調變控制電路15。其中，第 二 早兀為第-隔離魏電路31、第二級隔離單元 :第二隔離變壓電路32。電源電路38可包括主電二 ^一隔離變壓電路31、回授電路36及複 變 =且主電源U可為產生或接收一高壓直以 。，此技藝者’電源電路38可湘如反驰式或是= 任何習知的魏電料構設相達成。 一 /、 一38之主電源11產生-電源訊號，透過-1 …’堅電路31進行一次的電壓轉換，以產生第一 _ 8/18 M398134And a substrate voltage circuit, wherein a base voltage signal is induced by a negative voltage terminal of one of the second secondary side windings of the first stage isolation transformer unit, and And coupled to the other side of the plurality of LED strips to drive the plurality of LED strips with the second driving signal. This creation provides an LED backlight drive module with the main advantages: 7/18 M398134 1. Higher power conversion efficiency than the conventional circuit architecture. 2. It can reduce the design cost of the circuit. 3. Since the transformer circuit is used for current balance, there is no additional rate of interference caused by £MI radiation. 4, no need to use additional heat sink. 5. The complexity of the circuit is independent of the number of LED dies in the LED strip. 6, LED light strips have excellent current sharing capability. The above summary and the following detailed description and drawings are intended to further illustrate the manner in which the creation is intended to achieve the intended purpose. Other purposes and advantages of this creation will be explained in ^ and in the schema. (4) Ming [Embodiment] As shown in the second figure, the LED back, ί «force module 30 of the first embodiment of the present invention has a main power supply u, a first-level division rotary unit =, and a white isolation unit And a plurality of rectification "wave circuit 33, a plurality of i, 34, pulse width machine dimming and feedback power more than Wei 35, - a road 36 and a pulse width modulation control circuit 15. The second isolation device is a first isolation transformer circuit 31 and a second isolation device: a second isolation transformer circuit 32. The power circuit 38 can include a main power ii isolation transformer circuit 31, a feedback circuit 36, and a complex = and the main power source U can generate or receive a high voltage. The craftsman's power circuit 38 can be achieved as a reverse or a conventional one. A /, a 38 main power supply 11 generates a power signal, and a voltage conversion is performed through the -1 ... 'hard circuit 31 to generate the first _ 8/18 M398134
訊號。透過複數個第二隔離變壓電路32對第一驅動訊號進 行二次的電壓轉換，再透過相對應之整流濾波電路33的整 流及濾波’產生複數個第二驅動訊號及回授電壓訊號。藉 由複數個第二驅動訊號驅動相對應之LED光條34發光，並 藉由複數個脈寬調變調光暨回授電流偵測電路35以調整發 光亮度及產生一回授電流訊號。最後，回授電路36偵測回 授電流訊號及回授電壓訊號，及脈寬調變控制電路15進行 回授控制，以穩定電源電路38之第一驅動訊號的輸出電壓Signal. The second driving voltage conversion circuit 32 performs a second voltage conversion on the first driving signal, and then through the rectification and filtering of the corresponding rectifying and filtering circuit 33 to generate a plurality of second driving signals and feedback voltage signals. The corresponding LED strips 34 are driven to emit light by a plurality of second driving signals, and a plurality of pulse width modulation dimming and feedback current detecting circuits 35 are used to adjust the brightness of the light and generate a feedback current signal. Finally, the feedback circuit 36 detects the feedback current signal and the feedback voltage signal, and the pulse width modulation control circuit 15 performs feedback control to stabilize the output voltage of the first driving signal of the power circuit 38.
其中’ LED光條34可包含複數個LED晶粒的串聯或 串ϋ聯’且各自連接於一相對應之第二隔離變壓器32、整 流濾波電路33以及脈寬調變調光暨回授電流偵測電路35 、。並且，複數個第二隔離變壓電路32是以相互串聯的方式 連接，且與第一隔離變壓電路31的次級側繞組並聯。藉此 於=數個第二隔離變壓電路32即可感應相同電流值之複 文個第二驅動訊號，以達到均勻電流的目的。 主電源11之主電源訊號’可藉由第一隔離變壓電路31 進行—次的電壓調整，以產生較低f壓值之第—驅動訊號 ^於第-級隔離變壓單元及第二級隔離變壓單元可呈備 ^的電轉換效率，因此其電源轉換的功率損耗較低。 驅動職透過複數個第二隔離變壓電路32進行, 4 ’即可產生具有適當電壓與均㈣流之第二電麼 :於m動訊號已經過第—級隔離變壓單元的電壓 變編if此階段’、第二級隔離魏單71可使用較低耐壓的 甘二顧降低成本’並且其錢轉換的幅度較小， 其電源轉換的功率損耗也可降低。如上所述， 因此 驅動模組30 9/18 M398134 可具有極佳的電源轉換效率，可避免使用額外的散熱片， 以降低成本。 另外，將複數個第二隔離電壓轉換電路32彼此φ聯， 即可使第二驅動訊號達到均流的效果以驅動複數個LED光 條34具有均勻的發光亮度。並且，可應用此驅動模組30 ，驅動更多的LED光條34或是具有更多LED晶粒的LED 光條34，避免使用複雜的電路設計以降低成本。 如第四圖所示，為第三圖之驅動模組30的實際應闬之 電路圖。其中，第一隔離變壓電路31及複數個第二隔離變 壓電路32各自具有一繞組，複數個第二隔離變壓電路32 各自之初級側繞組相互串聯，並且複數個第二隔離變壓電 路32與第一隔離變壓電路31之次級側繞組並聯。籍此、 第一隔離變壓電路31之次級側繞組所感應之電流，即可依 序流經複數個第二隔離變壓電路32之初級側繞組，以於複 數個第二隔離變壓電路32之次級側繞組感應相同電流值之 第二驅動訊號，達到均流的目的，以驅動複數個LED光條 34具有均勻的發光亮度。 另外，脈寬調變調光暨回授電流偵測電路35可藉由一 電流感測電路RS1偵測回授電流訊號，並回授至回授電路 36。同時，可於複數個整流濾波電路33，分別取出對應之 LED光條34的回授電壓訊號，並回授至回授電路36，並藉 脈寬調變電路15,以調整及穩定電源電路38產生之第一驅 動訊號。 實際應用上，亦可任意地調整LED光條34之數量及其 對應之第二隔離變壓器32、整流濾波電路33，以擴充或減 少所需的LED光條34數量。 10/18 M398134 如第五圖所示，為根據本創作第二實施例LED背光源 之具有基底電壓（Base Voltage)的驅動模組5〇。其中，與 第一貫施例之驅動模組30的差異點在於：第一級隔離變壓 單元之第一隔離變壓電路51具有第一次級側繞組以及第二 次級側繞組，且一基底電壓電路52藉由第一變壓電路51 之第二次級側繞組，以產生一基底電壓訊號，並將該基底 電壓汛號编合至複數個LED光條34，以使複數個LED光條 34產生足夠的電壓差。其中，基底電壓訊號為一具有負值 電壓準位之電壓訊號，因此可降低第二隔離變壓電路32的 正值之乐二驅動訊號施加於LED光條34之雪廢差，以降低 呆二隔離變壓電路32的承載功率，藉以降低該第二隔離變: 壓電路32之成本。 自於LED光條34是由複數個LED晶粒相互串聯，且LED 啕基準的導通電壓（一般白光LED在規格電流下之導通.電壓 約為3. 3V) ’加上其導通電壓的分布約為±1〇%，所以本創作 加入了一疊加的基底電壓概念，只要LED光條34的總電壓 扣除基底電壓後的壓差控制在1. 5至2. 5倍的LED導通電 壓誤差值，即可達到均流的目的，且由於疊加的基底電壓 為負值電壓準位，則第二級隔離變壓單元輸出之第二驅動 訊號的電壓的正值準位得以降低，使得第二級隔離變壓單 元的承載功率大為下降，因此可大幅縮小第二級隔離變壓 單元的尺寸大小，以降低成本及PCB電路板的使用面積。 藉此’即可構成一具有良好電源轉換效率及低成本之led 背光驅動模組。 如第六圖所示’為第五圖之驅動模組5〇的實際應用電 路圖。其中，第一隔離變壓電路51具有第一次級側繞組以 11/18 及第二次級側繞組的變壓電路。複數個第二隔離變壓電路 32之初級側繞組以串聯方式連接，且複數個第二隔離變壓 電路3 2與第-變壓電路5】之第—次級側境組並聯。 並且，基底電壓電路52利用第一隔離變壓電路5丨之 第二次級側繞組之負壓端感應一基底電壓訊號。並將此基 底電壓訊號耦合至複數個LED光條34,使施加於複數個 LED光條34之電壓大部分由該基底電壓訊號提供。即是， 當第二隔離變壓電路32之第二驅動訊號施加於哪光條 34的-側’且基底電壓電路52之基底電壓訊號施加於led 光條34的另一側，則可藉著第二驅動訊號及基底電壓訊號 產生-適合驅動LK)光條34之電壓差，以降低第二驅動 訊號之正值電壓準位。 …碏甴基底電Μ1；路5 2，第二隔離變壓電路3 2的承載功 千可以大幅度下降，並減少其轉換損失，因此可以降低第 二變壓電路32的成本及使驅動模組5〇具有極佳的電源轉 換效率。 —… 热知本技蟄者，亦可將複數個第二變壓電路32的串聯 以及基底電壓電路52分別實施於不_，以達到不 同的目的及效果。 如第七圖與第八圖所示，為本創作第三實施例之具有 兩個第一隔離變壓電路51的驅 略示意圖。依據本創作之第二實施例，可二= ，變壓單元之隔離龍電路51之數量，以配合對應數 夏的LED光條34。本實施例藉由兩個第—隔離變壓電路 51的初級側繞組相互串聯，且第一隔離變壓電㈣所對應 之複數個第二隔離變壓電路32各自的初級側繞_相互串 12/18 聯。透過兩個第一隔離變壓電路51之初級側繞組的串聯， 則不同第一隔離變壓電路51之第一次級側繞組感應具有相 同電流值之複數個第一驅動訊號，再藉著第二隔離變壓電 路32的初級側繞組的串聯，亦可使得第二隔離變壓電路32 的次級側繞組感應具有相同或相同電流值的複數個第二驅 動汛號，以達到均流的目的，並驅動複數個LED光條34 產生均勻的亮度。 於本實施例，兩個基底電壓電路52分別藉由兩個第一 隔離變壓電路51之第二次級側繞_負壓端感應基底電壓 H以降低第二驅動訊號的正值電壓準位。冑此，即可 構成-具有良好電源轉換效率及低成本之咖f光驅動 置。 ..、 如第九圖所不’為本創作第四實施例，利兩 電源架構之驅動模組9G，用以驅動LED光條34的且^ 施方式铺用如第二實施例之複數個第 目的。二二2的初級側繞組相互串聯’以達到均流的 光Γ氏電堡電路92提供一基底電壓訊號，於led i足夠的f壓差°亦利用基底電>1電路92產生 二二乂降低第二驅動訊號的正峨準位。因 汽苑例可利用任何一種習知的電 ，故可廣泛其應用性。 电原本構以構成 及圖Ϊ而:上2 ’僅為本創作的具體實施例之詳細說明 以下述之申請專=本創作，本創作之所有範_ 作之領域何熟悉該項技藝者在本創 案所界定之專利範圍。&盍在以下本 13/18 M398134 【圖式簡單說明】 第一圖所示為利用直流一直流轉換之LE 的驅動模組示意圖。 模組示之利料性穩流電路之哪背光源的驅動 驅動S =為根據本創作第-實施例之哪背光源的 驅』根據本創作第-實施一背光源的 驅動為根據本創作第二實施例之㈣背光源的 施例之LED背光源的 第六圖所示為根據本創作第二 驅動模組的電路圖。 Η作第三實施例之LED背光源的 第七圖所示為根據本倉 驅動模组示意圖。 根據本創作第三實施例之_ 背光源的 【主要元件符號說明】 90 :驅動模組 10、20、30、50、7〇、 11 :主電源 12 :隔離變壓電路 13'33、93:整流攄波電路 H/18The 'LED strip 34 may comprise a series or series of LED dies connected to each other and connected to a corresponding second isolation transformer 32, rectifying and filtering circuit 33, and pulse width modulation dimming and feedback current detection. Circuit 35, . Further, the plurality of second isolation transformer circuits 32 are connected in series with each other and in parallel with the secondary side winding of the first isolation transformer circuit 31. Therefore, the second isolation transformer circuit 32 can sense the second driving signals of the same current value to achieve a uniform current. The main power signal of the main power source 11 can be subjected to voltage adjustment by the first isolation transformer circuit 31 to generate a lower-voltage value of the first-drive signal to the first-stage isolation transformer unit and the second stage. The isolation transformer unit can provide the electrical conversion efficiency of the power supply, so the power loss of the power conversion is low. Driven by a plurality of second isolated transformer circuits 32, 4' can generate a second voltage with an appropriate voltage and a uniform (four) current: the voltage signal has been passed through the first stage isolation transformer unit. At this stage, the second-stage isolation Weidan 71 can reduce the cost by using a lower withstand voltage, and the amount of money conversion is smaller, and the power loss of the power conversion can also be reduced. As mentioned above, the drive module 30 9/18 M398134 has excellent power conversion efficiency and avoids the use of additional heat sinks to reduce costs. In addition, the plurality of second isolated voltage converting circuits 32 are φ connected to each other to achieve a current sharing effect of the second driving signals to drive the plurality of LED strips 34 to have uniform luminance. Moreover, the driving module 30 can be applied to drive more LED strips 34 or LED strips 34 with more LED dies, thereby avoiding the use of complicated circuit design to reduce cost. As shown in the fourth figure, it is a circuit diagram of the actual application of the drive module 30 of the third figure. The first isolation transformer circuit 31 and the plurality of second isolation transformer circuits 32 each have a winding, and the primary isolation windings of the plurality of second isolation transformer circuits 32 are connected in series with each other, and the plurality of second isolation transformer circuits are connected in series. 32 is connected in parallel with the secondary side winding of the first isolation transformer circuit 31. Therefore, the current induced by the secondary side winding of the first isolation transformer circuit 31 can sequentially flow through the primary side windings of the plurality of second isolation transformer circuits 32 to form a plurality of second isolation transformer circuits. The secondary side winding of 32 induces a second driving signal of the same current value for the purpose of current sharing to drive the plurality of LED strips 34 to have a uniform luminance. In addition, the pulse width modulation dimming and feedback current detecting circuit 35 can detect the feedback current signal through a current sensing circuit RS1 and feed it back to the feedback circuit 36. At the same time, the feedback voltage signal of the corresponding LED strip 34 can be respectively taken out by the plurality of rectifying and filtering circuits 33, and fed back to the feedback circuit 36, and the pulse width modulation circuit 15 is used to adjust and stabilize the power circuit. 38 generates the first driving signal. In practical applications, the number of LED strips 34 and their corresponding second isolation transformer 32 and rectification filter circuit 33 can also be arbitrarily adjusted to expand or reduce the number of LED strips 34 required. 10/18 M398134 As shown in FIG. 5, it is a drive module 5B having a base voltage of the LED backlight according to the second embodiment of the present invention. The difference from the driving module 30 of the first embodiment is that the first isolation transformer circuit 51 of the first stage isolation transformer unit has a first secondary side winding and a second secondary side winding, and one The substrate voltage circuit 52 generates a base voltage signal by using the second secondary winding of the first transformer circuit 51, and couples the base voltage nickname to the plurality of LED strips 34 to enable the plurality of LED lights. Strip 34 produces a sufficient voltage difference. Wherein, the base voltage signal is a voltage signal having a negative voltage level, so that the positive value of the second isolation transformer circuit 32 can be reduced to apply the snow to the LED light strip 34 to reduce the dead space difference. The load power of the transformer circuit 32 is isolated to reduce the cost of the second isolation transformer: the voltage circuit 32. Since the LED strips 34 are connected in series by a plurality of LED dies, and the on-voltage of the LED 啕 reference (normally, the white LED is turned on at a standard current. The voltage is about 3. 3V) 'plus the distribution of the on-voltage thereof. The value of the LED turn-on voltage error is 1.5 to 2.5 times, as long as the total voltage of the LED strip 34 is subtracted from the substrate voltage. The purpose of current sharing can be achieved, and since the superposed substrate voltage is a negative voltage level, the positive value of the voltage of the second driving signal output by the second-stage isolation transformer unit is reduced, so that the second-stage isolation is performed. The load-carrying power of the transformer unit is greatly reduced, so the size of the second-stage isolation transformer unit can be greatly reduced to reduce the cost and the area of the PCB board. In this way, a LED backlight driving module with good power conversion efficiency and low cost can be constructed. As shown in the sixth figure, it is the actual application circuit diagram of the drive module 5A of the fifth figure. Wherein, the first isolation transformer circuit 51 has a transformer circuit of the first secondary side winding with 11/18 and the second secondary side winding. The primary side windings of the plurality of second isolation transformer circuits 32 are connected in series, and the plurality of second isolation transformer circuits 3 2 are connected in parallel with the first-secondary boundary group of the first transformer circuit 5]. Moreover, the substrate voltage circuit 52 senses a base voltage signal by using the negative terminal of the second secondary winding of the first isolation transformer circuit 5丨. The base voltage signal is coupled to a plurality of LED strips 34 such that a majority of the voltage applied to the plurality of LED strips 34 is provided by the base voltage signal. That is, when the second driving signal of the second isolation transformer circuit 32 is applied to the side of the light strip 34 and the base voltage signal of the substrate voltage circuit 52 is applied to the other side of the led light strip 34, The second driving signal and the substrate voltage signal generate a voltage difference suitable for driving the LK strip 34 to reduce the positive voltage level of the second driving signal. ...the base circuit 1; the path 5 2, the second isolation transformer circuit 3 2 can greatly reduce the load carrying capacity and reduce its conversion loss, thereby reducing the cost of the second transformer circuit 32 and enabling the drive module 5〇 has excellent power conversion efficiency. -... Those skilled in the art can also implement the series connection of the plurality of second transformer circuits 32 and the base voltage circuit 52, respectively, to achieve different purposes and effects. As shown in the seventh and eighth figures, a schematic diagram of a drive having two first isolation transformer circuits 51 according to the third embodiment of the present invention is shown. According to the second embodiment of the present invention, the number of the isolation dragon circuits 51 of the transformer unit can be doubled to match the number of LED strips 34 corresponding to the summer. In this embodiment, the primary side windings of the two first isolation transformer circuits 51 are connected in series with each other, and the primary side windings of the plurality of second isolation transformer circuits 32 corresponding to the first isolation transformer (4) are mutually arranged. /18. Through the series connection of the primary side windings of the two first isolation transformer circuits 51, the first secondary side windings of the different first isolation transformer circuits 51 sense a plurality of first driving signals having the same current value, and then The series connection of the primary side windings of the two isolation transformer circuits 32 may also cause the secondary side windings of the second isolation transformer circuit 32 to induce a plurality of second driving apostrophes having the same or the same current value for the purpose of current sharing. And driving a plurality of LED strips 34 to produce uniform brightness. In this embodiment, the two substrate voltage circuits 52 respectively sense the substrate voltage H by the second secondary side of the two first isolation transformer circuits 51 to reduce the positive voltage level of the second driving signal. . In this way, it can be constructed - a power supply with good power conversion efficiency and low cost. . . . , as shown in FIG. 9 is a fourth embodiment of the present invention, the driving module 9G of the two power supply architecture is used to drive the LED light strips 34 and is applied in a plurality of manners as in the second embodiment. The first purpose. The primary side windings of the second and second two are connected in series to each other to provide a base voltage signal for the current sharing of the optical voltaic circuit 92, and a sufficient f differential voltage at the led i is also generated by the substrate electric > 1 circuit 92. Lower the positive drive level of the second drive signal. Since the automobile court can use any conventional electric power, it can be widely applied. The original structure is composed of the following: The above 2 ' is only a detailed description of the specific embodiment of the creation. The following application is dedicated to this creation, and all the fields of this creation are familiar to the artist. The scope of patents defined by the case. & 盍 in the following 13/18 M398134 [Simple description of the diagram] The first figure shows a schematic diagram of the drive module using LE for direct current conversion. Which of the backlights of the module shows the driving drive of the backlight source S = which drive of the backlight according to the first embodiment of the present invention is based on the creation of the backlight of the first implementation of the present invention The sixth diagram of the LED backlight of the embodiment of the fourth embodiment of the backlight is shown in the circuit diagram of the second driving module according to the present invention. The seventh diagram of the LED backlight of the third embodiment is shown as a schematic diagram of the drive module according to the present. According to the third embodiment of the present invention, [main component symbol description] 90: drive module 10, 20, 30, 50, 7〇, 11: main power supply 12: isolation transformer circuit 13'33, 93: Rectifier chopper circuit H/18