TWI242177B - Power supply for an LCD panel - Google Patents

Power supply for an LCD panel Download PDF

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Publication number
TWI242177B
TWI242177B TW093109968A TW93109968A TWI242177B TW I242177 B TWI242177 B TW I242177B TW 093109968 A TW093109968 A TW 093109968A TW 93109968 A TW93109968 A TW 93109968A TW I242177 B TWI242177 B TW I242177B
Authority
TW
Taiwan
Prior art keywords
voltage
signal
power supply
supply system
patent application
Prior art date
Application number
TW093109968A
Other languages
English (en)
Other versions
TW200426749A (en
Inventor
Yung-Lin Lin
Da Liu
Original Assignee
O2Micro Int Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by O2Micro Int Ltd filed Critical O2Micro Int Ltd
Publication of TW200426749A publication Critical patent/TW200426749A/zh
Application granted granted Critical
Publication of TWI242177B publication Critical patent/TWI242177B/zh

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/282—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/282—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
    • H05B41/2825—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a bridge converter in the final stage
    • H05B41/2827—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a bridge converter in the final stage using specially adapted components in the load circuit, e.g. feed-back transformers, piezoelectric transformers; using specially adapted load circuit configurations
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/282—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
    • H05B41/2825—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a bridge converter in the final stage
    • H05B41/2828—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a bridge converter in the final stage using control circuits for the switching elements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Inverter Devices (AREA)

Description

1242177 (1) 玖、發明說明 【發明所屬之技術領域】 本發明係有關一種用於液晶顯示器（L C D )的電源， 更具體的是有關一種給液晶電視機（L C D T V )的多數冷陰 極螢光燈供電的背光電源。 【先前技術】 第1圖所示爲一種液晶顯示器（LCD )螢幕的習用電 源系統10。在該習用系統中，1 10V/2.20V交流電源通過 一個整流器電路或功率因數校正（PFC )電路12轉換爲 一個高直流電壓。然後，該高直流電壓通過一個直流/直 流（DC/DC)轉換器14降壓後，可以爲一些電子裝置提 供例如5 V和]2 V的低電壓，這些電子裝置包括微控制 器、記憶體、TFT驅動器、顯示卡和冷陰極螢光燈 (CCFLs )。換流器（inverter ) 1 6再把低直流電壓轉換 爲一個高交流電壓從而給LCD螢幕1 8的CCFL供電。直 流/直流轉換器1 4和直流/交流換流器1 6的多次電壓轉換 會影響轉換效率並在系統中產生熱量。對於大 LCD螢 幕，比如LCD電視中的螢幕，大部分的電能都消耗在 C C F L上。因此，提高用於C C F L的換流器的效率就很重 要。 第2圖所示爲一種提高換流器系統效率的習用電源系 統2 0，其中，高直流電壓直接送入直流/交流換流器 1 6，。這減少了直流/直流轉換器的中間步驟，從而提高了 -4- (2) 1242177 總效率。
如第3圖、第3 A圖和第4圖所示，一個高直流電壓 轉換爲一個交流信號需要一個低匝數比的變壓器接到 CCFL。第3圖所示爲一種換流器電路30，該換流器電路 30建立在一個半橋式電路（兩個開關）上，並且包括一 個換流器控制器3 2，該換流器控制器3 2驅動開關3 4和 3 6給變壓器3 8提供必需的電壓。換流器控制器3 2和半 橋式電路都是本領域所公知的。第 3 A圖所示爲一種 Class D式換流器電路 30’，第4圖所不爲·—種全橋式 (四個開關）換流器電路3 0 ”，它們都是本領域所公知 的。第4圖所示電路還示出了回授線，但回授線在本論述 中不予討論。因爲變壓器的尺寸是根、據C C F L的應用情況 來選擇的，所以驅動CCFL的二次線圈通常是由負載需求 所固定的。然而，在高電壓輸入的情況下，變壓器的一次 線圈的線圈匝數遠高於爲低電壓輸入（譬如5 V - 2 0 V )所 驅動的線圈匝數，這就增加了變壓器的複雜度和成本。 【發明內容】 本發明的主要目的，係提出了一種用於LCD螢幕的 電源系統，包括： 一個能控制多數開關，從而把一個直流信號轉換爲一 個高電壓交流信號的換流器控制器； 多數接收高電壓交流信號的變壓器，並且上述每個變 壓器都產生一個高電壓正弦信號，其中每個變壓器都有一 (3) 1242177 個一次側和一個二次側，每個一次側相互串聯在該高電壓 交流信號兩端；和 一個包括多數冷陰極螢光燈管的LCD螢幕，每個燈 管都由上述變壓器一個對應二次側供電。 本發明之另一目的，亦提出了一種用於LCD螢幕的 電源系統，包括： 一個能控制多數開關，從而把一個直流信號轉換爲一 個高電壓交流信號的換流器控制器； 多個接收高電壓交流信號的變壓器，並且上述每個變 壓器都產生一個高電壓正弦信號，其中每個變壓器都有一 個一次側和一個二次側，其中每個一次側相互串聯在該高 電壓交流信號兩端；和 一個包括多數冷陰極螢光燈管的LCD螢幕，每個燈 管都由上述變壓器至少兩個對應二次線圈供電。 這裏給出的任何實施例中，電源都可以從一個高直流 電壓信號轉換爲一個用來給諸燈管供電的高交流電壓。 値得本領域的技術人員重視的是，雖然下面的具體實 施方式的詳細說明，是基於本發明之技術特徵所提出的較 佳實施例，但是本發明並不僅僅局限於這些實施例。反 而，本發明涉及範圍廣泛，其範圍僅由相應申請專利範圍 限定。 本發明的其他特徵和優點將在下面的具體實施方式中 得到充分體現，具體實施方式中請參照附圖及其相關資 料、元件標號。 -6- (4) 1242177 【實施方式】 在液晶電視中，通常都採用多數CCFL來給LCD螢 幕提供充足亮度，例如，取決LCD螢幕的尺寸大小，而 有4至32個CCFL。一方面，本發明在電源轉換過程中， 變壓器的一次線圈是相互串聯的。 第5圖所示爲本發明的一個用於LCD螢幕的換流器 電路5 0的示範性實施例。在本示範性實施例中，變壓器 T1和T2的一次側串聯在一起。因此，每個一次側上的線 圈電壓爲跨在整個線圈上的輸入電壓的一半。與第4圖的 變壓器〜次線圈相比，本方法能使線圈匝數減少爲原來的 一半。在第5圖所示的半橋式電路中，把變壓器的一次側 相串聯’這使得每個線圈上的電壓減小爲輸入電壓的四分 之一 °當應用半橋式電路時，每個線圈上的電壓應力爲輸 入電壓的1/(2N)(其中N爲串聯的變壓器的個數）。當 然’第5圖所示電路中也可以改用一個全橋式電路，此時， 當N個變壓器的一次線圈相串聯時，每個一次線圈上的 電壓應力減小爲輸入電壓的1 /N。第5 A圖所示爲一個 Class D換流器電路，因爲變壓器的一次線圈也是相串聯 的，所以它與上述第5圖所示的電路具有相同的優點。 第6圖所示爲本發明換流器電路中的變壓器和LCD 螢幕的電路圖5 2。在該圖中，此槪念延伸至藉由於第5 圖所示的A點和B點之間，串聯連接四個一次側T1、 丁2、丁3、和丁4，來給四個CCfL燈管供電。同樣，利用 (5) 1242177 類似方法延伸至第7圖中的N燈管電路5 2，，其用N個 變壓器給N個C C F L燈管供電。 因爲每個一次線圈相串聯，所以在開關電路（例如， 半橋式、全橋式或Class D式的開關電路）導通、斷開期 間，流經每個變壓器一次側的電流是相同的。第5圖、第 6圖和第7圖中，開關電路連在A點和b點之間。這種結 構解決了習用技術的缺點並進一步達到每個驅動C C F L的 變壓器二次側的電流平衡的功效。 第8圖所示爲本發明的一種示範性LCD電源系統100 的詳細電路圖。該電源包括一個驅動半橋式電路中的兩個 開關5 4和5 6的換流器控制器5 2，如上述第5圖所示。 該換流器控制器52包括用來控制連在電路上CCFL供電 狀況的電壓和電流回授。根據上述的原理和描述，每個 CCFL由如圖所示的一個一次側串聯變壓器所供電（例 如，ΤΙ，T2…T ( η-1 ) ，Τη， Τχ ;其中η代表偶數個 燈管，X代表奇數個燈管）。 電流回授是由圖8電路中的燈管1 ( CCFL 1 )和燈 管2 ( CCFL 1 )導出的回授電路60產生的。該示範性電 流回授電路6 0包括一個光耦合器6 2和一個調節器6 4。 調節器64放大電流回授信號CFB，光耦合器62再把回授 信號傳送給換流器控制器5 2。同樣，電壓回授資訊也是 由電壓回授電路7 0產生的。該示範性實施例中，從電路 中每個燈管所偵測到的電壓回授資訊產生一個電壓回授信 號 VFB。 -8- (6) 1242177 第8圖所示的詳細電路中還包括其他與本發明有關的 電路。例如，一個脈寬調變（P WM )控制器5 8產生直流 電源信號（例如，1 2 V和5 V )給其他與L C D顯示器相關 的元件（例如記億體、微處理器等）供電。同樣，如上所 述’功率因數校正（PFC )電路1 2可以採用任何傳統和/ 或自定義的電路來產生一個高直流電壓。 另一方面，本發明亦提出了一種驅動長CCFL 燈管的電路。LCD電視中採用的CCFL燈管的尺寸通常比 攜帶型裝置中的LCD顯示器的CCFL燈管長。而驅動長 CCFL變得更困難。例如，如第3圖、第3A圖和第4圖 所示之驅動任何長約60釐米以上燈管的習用方法中，需 要在CCFL上加一個高頻高電壓（通常在1 000伏有效値 左右），而CCFL的另一側電位接近於底盤接地（chassis ground)。由於CCFL和底盤接地之間存在泄流路徑，所 以這些驅動方法通常會使CCFL燈管的一側變黑。長燈管 可表示75至80cm或更長，並且長燈管通常意味著有一 個洩漏電容，從而影響燈管電極之間的電子漂移。 爲了解決該問題，本發明提出了 一種不同於習用技術 而進一步改良的驅動技術。如第9圖所示，一根長燈管可 以由兩個相位極性相反的變壓器驅動。第9圖中，CCFL 1 由T ]二次線圈的正極和T 2二次線圈的負極驅動（正負 極是由變壓器產生的正弦電源信號的半個週期表示的）。 實際上，CCFL 1的中心爲近似零電位。例如，每個變壓器 輸出5 00伏有效値時，其電壓應力和機械間距就安全要求 (7) 1242177 範圍而言就會減小很多。 另一方面，上述驅動技術也可以改進爲如第1 0圖所 示。第10圖所示爲一種用兩個控制器202和204與兩個 換流器電路 2 0 6和 2 0 8來驅動一個 C C F L的驅動電路 2 0 0。兩個換流器電路通過一個同步信號2 1 0彼此相連， 因此控制器2 02、204控制各自的換流器電路2 06、2 0 8， 從而產生如圖]〇中所示近似1 8 0度相位差的正弦信號。 這確保燈管能在每半個週期接收到來自每個換流器的全部 電壓，而不存在電源信號抵消。當然，本電路還可以包括 電壓和/或電流回授，來控制燈管的供電狀況。 本發明的換流器控制器可以是包括用來調節傳送至燈 管功率的減光電路（例如，脈衝模式、類比式和/或相位 式）的習用換流器控制器。能控制半橋式、全橋式、 Class D式和/或其他換流器電路的換流器控制器都是本領 域所公知，並且都與本發明等同。例如，在此引作參考的 美國專利No.6,2 5 9,6 15和N〇.5 5 6 I 5,0 93都分別披露了用 於全橋式和半橋式換流器電路的換流器控制器。換流器控 制器還可以採用由〇2Micr〇國際有限公司生產的，例如No OZ960、OZ961、OZ965、OZ970、OZ971、OZ9 7 2 或 OZ9RR。 另外，在本發明的揭露與說明下本領域之技術人員可 以了解到，如圖所示的LCD螢幕包括能產生一個表示燈 管負載上電壓和/或電流情況的電壓和/或電流回授信號的 電路。在此所述的換流器控制器還能接收該回授資訊，從 -10- (8) 1242177 而調節供給燈管負載上的電壓和/或電流。在前述 性實施例中，電流回授可以是第5圖和第5 A圖中 燈管中的一個產生的，或者第6圖、第7圖和第8 N個燈管中的兩個燈管產生。第9圖中，電流回授 號是由未與燈管相連的變壓器二次線圈部分產生的 情況下，流至燈管電流的每半個週期都得到監控。 電壓回授控制信號可以由本領域熟知的方法產生。 在示範性實施例中，通過換流器控制器的控制 壓器和電源相連。該換流器控制器把一個高電壓直 t原轉換爲一個高電壓交流信號（方波）。接著，變 高電壓交流信號轉換爲高電壓正弦電源給燈管供 然’本發明也可以用一個低電壓直流電源，此時變 把電壓提高到一個適當的電壓來驅動燈管。本領域 人員將知道許多對本發明的改進，所有的這些改進 是：在本發明的精神之內，都受限於本發明的申請 圍。 【圖式簡單說明】 第1圖所示爲一種用於LCD螢幕的習用電源 塊圖； 第2圖所示爲另一種用於LCD螢幕的習用電 方塊圖； 第3圖所示爲一種用於LCD螢幕的習用換流 圖； 的示範 的兩個 圖中的 控制信 ，在該 同樣， 使得變 流信號 壓器把 電。當 壓器將 的技術 都認爲 專利範 系統方 源系統 器電路 -11 - (9) 1242177 第3A圖所示爲另一種用於LCD螢幕的習用換流器電 路圖； 第4圖所示爲另一種用於LCD螢幕的習用換流器電 路圖； 第5圖所示爲本發明的用於LCD螢幕的換流器電路 的一個示範性實施例； 第5 A圖所示爲本發明的用於LCD螢幕的換流器電路 的另一個示範性實施例； 第6圖所示爲本發明的換流器電路中的變壓器和LCD 螢幕的一電路圖； 第7圖所示爲本發明的換流器電路的中變壓器和LCD 營幕的另一電路圖； 第 8圖所示爲本發明的 LCD電源系統的詳細電路 圖； 第9圖所示爲本發明的換流器電路中的變壓器和L C D 螢幕的另一電路圖；和 第10圖所示爲另一種一個CCFL用兩個控制器和兩 個換流器電路驅動的驅動電路。 【主要元件符號說明】 ]0、2 0、] 〇 〇 電源系統 12 功率因數校正電路 14 轉換器 1 6 ’、] 6 直流/交流換流器 -12- (10) (10)1242177 18 液晶顯示器螢幕 30、30’、30”、50、50’、206、2 0 8 換流器電路 32、52、52’、2 02、2 04 換流器控制器 34、 36、 54、 56 開關 38 變壓器 6 0 該不範性電流回授電路 62 光耦合器
2 0 0驅動電路 2 1 0同步信號
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Claims (1)

  1. 拾、申請專利範圍 附件二A:第93109968號修正後無劃線之 中文申請專利範圍替換本民國94年7月15曰呈 1. 一種高電壓液晶顯示器電源系統，包括： 一換流器控制器，能控制多數開關，從而把一高電壓 直流信號轉換爲一高電壓交流信號； · 多數接收所述高電壓交流信號的變壓器，且每個所述 變壓器都產生一個高電壓正弦信號，其中所述每個變壓器 都有一個一次側和一個二次側，所述每個一次側相互串聯 在該高電壓交流信號的兩端；和 一液晶顯示器螢幕，包括多數冷陰極螢光燈管，每個 所述燈管都由所述變壓器一個對應二次側供電。 2 ·根據申請專利範圍第1項所述的電源系統，其中 所述多數開關按全橋式電路結構排列，且所述換流器控制 · 器能控制所述全橋式電路。 3 .根據申請專利範圍第1項所述的電源系統，其中 所述多數開關按半橋式電路結構排列，且所述換流器控制 器能控制所述半橋式電路。 4 ·根據申請專利範圍第1項所述的電源系統，其中 所述多數開關按Class-D式電路結構排列，且所述換流器 控制器能控制所述Class-D式電路。 5 ·根據申請專利範圍第1項所述的電源系統，更包 1242177 , ' , ..·. 94 括產生一個表示供給到至少一所述燈管的電流的電流回授 信號電路’且所述換流器控制器接收所述電流回授信號， 從而調節傳送至所述至少一燈管的電流。 6 ·根據申請專利範圍第1項所述的電源系統，更包 括產生一個表示供給到至少一所述燈管的電壓的電壓回授 信號電路’且所述換流器控制器接收所述電壓回授信號， 從而調節傳送至所述至少一燈管的電壓。 7. —種高電壓液晶顯示器電源系統，包括： φ 一換流器控制器，能控制多數開關，從而把一個高電 壓直流信號轉換爲一個高電壓交流信號； 多數接收所述高電壓交流信號的變壓器，且每個所述 變壓器都產生一個高電壓正弦信號，所述每個變壓器都有 一個一次側和一個二次側，所述每個一次側均相互串聯於 該高電壓交流信號兩端； 一包括多數冷陰極螢光燈管的液晶顯示器螢幕，每個 所述燈管都由所述變壓器的至少兩個對應二次側供電。 儀p 8 ·根據申請專利範圍第7項所述的電源系統，其中 所述燈管連接在一個第一二次側正極和一個第二二次側負 極之間。 9 ·根據申請專利範圍第7項所述的電源系統，其中 所述多數開關按全橋式電路結構排列，且所述換流器控制 器能控制所述全橋式電路。 10·根據申請專利範圍第7項所述的電源系統，其中 所述多數開關按半橋式電路結構排列，且所述換流器控制
    i、卜 J:: n: L 9.4, .- 15— 器能控制所述半橋式電路。 1 1 ·根據申請專利範圍第7項所述的電源系統，其中 所述多數開關按Class-D式電路結構排列，且所述換流器 控制器能控制所述C1 a s s - D式電路。 1 2 ·根據申請專利範圍第7項所述的電源系統，更包 括產生一個表示供給到至少一所述燈管的電流的電流回授 信號電路，且所述換流器控制器接收所述電流回授信號， 從而調節傳送至所述至少一個燈管的電流。 春 1 3 ·根據申請專利範圍第7項所述的電源系統，其中 所述電源系統還包括產生一個表示供給到至少一所述燈管 的電壓的電壓回授信號電路，並且所述換流器控制器接收 所述電壓回授信號，從而調節傳送至所述至少一個燈管的 電壓。 1 4. 一種用於液晶顯示器的電源系統，包括： 一換流器控制器，能控制多數開關，從而把一直流信 號轉換爲一高電壓交流信號； # 多數接收所述高電壓交流信號的變壓器，且每個所述 變壓器都產生一高電壓正弦信號，其中每個所述變壓器都 有一個一次側和一個二次側，所述每個一次側相互串聯在 局電壓交流信號的兩端； 一包括多數冷陰極螢光燈管的液晶顯示器螢幕，所述 多數燈管由所述變壓器的多數二次側供電。 15. 一種用於液晶顯示器面板的電源系統，包括： 一換流器控制器，能控制多數開關，從而把一直流信 1242177 94. 7. ] η .. 號轉換爲一高電壓交流信號； 多數接收所述高電壓交流信號的變壓器，且每所述個 變壓器都產生一個高電壓正弦信號，其中每個所述變壓器 都有一個一次側和一個二次側，所述每個一次側相互串聯 在該高電壓交流信號的兩端； 一包括多數冷陰極螢光燈管的液晶顯示器螢幕，每個 所述燈管都由所述變壓器至少兩個對應的二次側供電。 1 6 .根據申請專利範圍第1 5項所述的電源系統，其 中所述燈管連接在一個第一二次側正極和一個第二二次側 負極之間。
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US7425949B2 (en) 2008-09-16

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