201029518 六、發明說明： 【發明所屬之技術領域】 本發明是有關於一種驅動電路，特別是指一種單級式 高功因高效率螢光燈管駆動電路。 【先前技術】 冷陰極螢光燈（Cold Cathode Fluorescent Lamp，CCFL) 為一種照明燈管元件’並被廣泛應用及整合於液晶顯示螢 幕的背光模組内。 ❿ 參閱圖1 ’為一種習知的三級式液晶顯示器背光模組的 驅動電路’其第一級是由交流電源輸至功率因數控制電路 11 ’第二級為與該功率因數控制電路n電連接的直流直流 降壓轉換器12，第三級則為多數個分別與該直流_直流降壓 轉換器12之多組輸出電連接的直流_交流的換流器13，再 分別配合複數變壓器14，以產生多數高壓交流電來驅動多 數支冷陰極螢光燈100。 由於上述驅動電路是屬於三級式系統架構，電路元件 攀 及驅動控制電路繁多，造成整體轉換效率降低，此外，由 於液晶顯示螢幕的製造技術的不斷進步，其所能配合製造 的液晶顯示螢幕的.尺寸也日趨增大，而當液晶顯示螢幕越 大時’其走光需求也更大，也就是說，需要更多的冷陰極 螢光燈100來進行背光照明，因此，如是使用上述之三級 式驅動電路’其整體電路體積勢必更為複雜及龐大。 參閱圖2’為一種習知的兩級式液晶顯示器背光模組的 驅動電路，其前級為功因修正電路15，後級為將先前直流_ 3 201029518 直流轉換器與直流·交流換流㈣合成單―的直流·交流轉換 器16,但是經過兩級式的功率轉換，其電路效率仍然不高 因此，如何改善習知冷陰極螢光燈的驅動電路… 是在媒動效率’以及驅動多支冷陰極勞光燈時的電路精簡 程度上，皆有可以再進一步改善的空間。 【發明内容】 因此， 、高效率， 管驅動電路 本發明之目的，即在提供—種具有高功率因數 且電路體積精簡的單級式高功因高效率螢光燈 整流單元 23 — 早兀 於是，本發明之單級式高功因高效率榮光燈管驅動電 路’是與-交流電源電連接，以驅動至少一冷陰極螢光燈 ，該單級式高功因高效率勞缺管驅動電路包含：一電源 -交錯式半橋職換流^，及—雙端輪入均流 電及料元是與較流電源電連接，並將該交流 電源整流成直流電源。 該交錯式半橋諧振換流器具有二個與該電源整流單元 體電容器、二個分別與該等第-電容器電連接 的弟一極體’二個分別輿兮莖笛 雷片哭β 等第一二極體電連接的第- 電感器’及二個分別與該等第一電感器電連 頻的功率開關’以相配合地將該 私 β 流電源修正為正弦波形且具有高功因流=所輸入的直 麼源。 具有-功因數，並輸出-穩定電 201029518 5雙端輸人均流單元是將該交錯式半橋譜振換流器所 產生的穩定電㈣升塵為啟動該冷陰極螢光燈的點燈電麼 、及提供該冷陰極螢光燈於穩態操作時所需之額定電壓 〇 本發明之功效在於，利用該交錯式半橋諧振換流器具 有高功因數及柔性切換的功能，以增進驅動效率，再利用 該雙端輸人均流單元以雙端輸人方式來進行冷陰極榮光燈 的驅動α在同時驅動多數支冷陰極勞光燈時能夠達到電 流平衡之功效，進岐整體驅動料具有減低輸人電流之 漣波、減少開關切換損失、高效率、高功率_、降低燈 管洩漏電流以及電路精緻化等優點。 【實施方式】 有關本發明之前述及其他技術内容、特點與功效，在 以下配合參考圖式之二個較佳實施例的詳細說明中，將可 清楚的呈現。 在本發明被詳細描述之前，要注意的是，在以下的說 明内容中，類似的元件是以相同的編號來表示，此外，以 下之實施例中，是以驅動冷陰極螢光燈來舉例說明，但並 不限於驅動冷陰極螢光燈。 參閲圖3、4,本發明單級式高功因高效率螢光燈管驅 動電路，是與一交流電源VAC電連接，以驅動一支冷陰極 螢光燈200’該單級式局功因高效率螢光燈管驅動電路包含 :一電源整流單元2、一交錯式半橋諧振換流器3，及一雙 端輸入均流單元4。 5 201029518 該電源整流單元2是與該交流電源VAC電連接，並將 該交流電源VAC整流成直流電源，在本實施例中，該交流 電源VAC為一般之市電所供應的110V，60Hz交流電源，而 該電源整流單元2為一由四個二極體相互電連接所組成的 全橋式整流器（Full-Bridge Rectifier)，但也可採用等效之電 路結構，並不應侷限於本實施例所揭露之特定電路結構。 該交錯式半橋諧振換流器3具有二個與該電源整流單 元2電連接的第一電容器C1、C2、二個分別與該等第一電 容器C1、C2電連接的第一二極體D1、D2,二個分別與該 等第一二極體D1、D2電連接的第一電感器L1、L2、二個 分別與該等第一電感器LI、L2電連接並操作在高頻（30 kHz 〜100kHz)的功率開關SI、S2、一個與該等第一電感器L1、 L2串聯的直流鏈電容CDC、一個與該等功率開關SI、S2串 聯的直流阻隔電容Cb，及一個與該直流阻隔電容Cb串聯 的諧振電感器Lr及一個諧振電容器Cr，以相配合地將該電 源整流單元2所輸入的直流電源修正為正弦波形且具有高 功因數，並輸出一穩定電壓源。 該雙端輸入均流單元4具有一個升壓變壓器41，及二 個與該升壓變壓器41及該冷陰極螢光燈200電連接的均流 電容器42,該升壓變壓器41之一次側是接收該交錯式半橋 諧振換流器3所產生的穩定電壓源，而該升壓變壓器41之 二次側則是與該二均流電容器42及該冷陰極螢光燈200形 成串聯，進而將該交錯式半橋諧振換流器3所產生的穩定 電壓源升壓為啟動該冷陰極螢光燈200的點燈電壓，以及 201029518 提供該冷陰極螢光燈200於穩態操作時所需之額定電壓。 配合參閱圖4、5,在此要注意的是，上述之交錯式半 橋諧振換流器3是操作在不連續導通模式（disc〇ntinu〇us mode)，在圖5中，該第一電感器u之電流…是以實線 表不，而該第一電感器L2之電流（U是以虛線表示。另外 ，由昇壓轉換器操作於不連續模式之文獻中可得知，輸入 電流之失真量與功率因素校正之能力皆與輸入峰值電壓與 輸出直流電壓之比值有關，當輸入電壓越接近輸出直流鏈 ❹ 電壓時（當兩者之比率越近於一時），其輸入電流失真因素越 嚴重且功因校正之能力越差，而本實施例使用之交錯式技 術乃利用該等第-電容器C1、C2將輸入電壓源分成二個相 等之電壓源（各為輸入電壓源之一半），並分別搭配該等第一 二極體Dl、D2與該等第一電感器L1、L2形成二個昇壓型 轉換器單元，如此一來，使得輸入電壓源與輸出直流鏈電 壓之比值小於一，以達到輸入電流失真因素小且功因校正 能力良好之目的。 • 該直流阻隔電容Cb之目的在於，當該等功率開關S1、 S2在交互啟閉以進行高頻交錯切換的作動時，可去除及抵 銷所產生之整體交錯波形之中的DC誤差值（DC 〇ffset卜該 直流鏈電容CDC是提供穩壓之功效，該諧振電感器^及諧 振電容器Cr兩者是相配合地形成一帶通濾波器（bandpass filter)，以濾除該交錯式半橋諧振換流器3整體輸出電壓中 的高頻成份，使得交錯式半橋諧振換流器3的輸出電壓波 形為一交流弦波（基本頻率的弦波），而利用兩個功率開關 7 201029518 S1、S2來形成一半橋式換流器態樣的目的在於：藉由此種 半橋式的電路設計，使該等功率開關sl、s2於開關切換時 能夠達到柔性切換（喊switehing)的作用以藉此降低開關 切換損失（switehing 1⑽），亦即，將該等功率開關s i、S2 之操作頻率設定在高於該諧振電感器Lr及諧振電容器。所 配合形成的諧振頻率，並使其諸振槽等同於電感性負載， 可使得該等功率開關S1、S2達到零電壓切換(聊-讀哪 响ching)，以減少該等功率開關S1、s2在導通瞬間的交越 損失進而增it整體電路之效率，纟半橋 < 的設計僅需要 使用到兩個功率開關S1、S2，也可節省電路元件的使用數 量。在本實施例中，是將該等功率開關S1、S2之操作頻率 設定於50kHz，但其可在3〇kHz〜1〇〇kHz的範圍内做調整， 端視實際實施時的設計考量而定。 在本實施例中，該等第一電感器L1、L2是分別具有獨 立之鐵芯（圖中未顯示鐵芯之實體結構，僅以等效電路來代 表）’當然，該等第一電感器L1、L2也可呈共鐵芯狀，也 就是說，每一第一電感器Ll、[2之線圈皆是纏繞於同一鐵 芯上，藉此能夠節省電路元件之數量及體積，以助於本發 明於實際實施時其磁性元件體積的扁平化與精緻化，端視 實際實施時的設計考量而定，在此並不加以設限。 另外，在本實施例中，該等功率開關S1、S2是採用 MOSFET來實施，但也可為BJT、IGBT等電子式開關來代 替，端視實際實施時的設計考量而定，並不應以本實施例 所揭露之說明為限。 201029518201029518 VI. Description of the Invention: [Technical Field] The present invention relates to a driving circuit, and more particularly to a single-stage high-efficiency high-efficiency fluorescent lamp tube swaying circuit. [Prior Art] Cold Cathode Fluorescent Lamp (CCFL) is a kind of lighting tube element' and is widely used and integrated in a backlight module of a liquid crystal display screen.参阅 Refer to FIG. 1 ' is a conventional three-stage liquid crystal display backlight module driving circuit' whose first stage is input from AC power to power factor control circuit 11 'the second stage is electrically connected to the power factor control circuit n The connected DC-DC buck converter 12, the third stage is a plurality of DC-AC converters 13 respectively electrically connected to the plurality of sets of DC-DC buck converters 12, and respectively matched with the complex transformer 14 A plurality of high-voltage alternating currents are generated to drive a plurality of cold cathode fluorescent lamps 100. Since the above driving circuit is a three-stage system architecture, the circuit components climb a large number of driving control circuits, resulting in a decrease in overall conversion efficiency. In addition, due to continuous advancement in the manufacturing technology of the liquid crystal display screen, the liquid crystal display screen can be manufactured in cooperation with the liquid crystal display screen. The size is also increasing, and when the liquid crystal display screen is larger, the demand for the light is larger, that is, more cold cathode fluorescent lamps 100 are required for backlighting, so if the above three levels are used, The drive circuit's overall circuit size is bound to be more complicated and large. Referring to FIG. 2' is a conventional driving circuit of a two-stage liquid crystal display backlight module, the front stage is a power factor correction circuit 15, and the latter stage is a DC _ 3 201029518 DC converter and DC/AC converter (4) Synthetic single-DC AC converter 16, but after two-stage power conversion, its circuit efficiency is still not high. Therefore, how to improve the driving circuit of the conventional cold cathode fluorescent lamp... is the medium efficiency and drive With the streamlinedness of the cold cathode lamp, there is room for further improvement. SUMMARY OF THE INVENTION Therefore, the high efficiency, tube drive circuit is the object of the present invention, that is, to provide a single-stage high-power high-efficiency fluorescent lamp rectifying unit 23 having a high power factor and a simplified circuit volume - as early as possible The single-stage high-efficiency high-efficiency glory lamp driving circuit of the present invention is electrically connected to an AC power source to drive at least one cold cathode fluorescent lamp, and the single-stage high-power high-efficiency labor-deficient tube driving circuit The utility model comprises: a power supply-interlaced half-bridge service commutation ^, and a double-end wheel-in-average current and a material element are electrically connected with the flow-through power source, and the AC power source is rectified into a DC power source. The interleaved half-bridge resonant converter has two capacitors of the power rectifying unit body and two brothers respectively electrically connected to the first capacitors. A diode-electrically connected first-inductor' and two power switches respectively electrically coupled to the first inductors are adapted to correct the private beta current supply to a sinusoidal waveform and have a high power factor flow = the source of the input. With -power factor, and output-stabilized power 201029518 5 double-ended input current sharing unit is the stabilizing electric (four) dust generated by the interleaved half-bridge spectral converter to activate the cold cathode fluorescent lamp And providing the rated voltage required for the steady-state operation of the cold cathode fluorescent lamp. The effect of the invention is to utilize the interleaved half-bridge resonant converter with high power factor and flexible switching function to enhance driving. Efficiency, the double-ended input current sharing unit is used to perform the driving of the cold cathode glory lamp in a double-ended input mode. When the majority of the cold cathode luminaires are driven at the same time, the current balance can be achieved, and the overall driving material has Reduce the ripple of the input current, reduce switching losses, high efficiency, high power _, reduce lamp leakage current and circuit refinement. The above and other technical contents, features and effects of the present invention will be apparent from the following detailed description of the preferred embodiments of the invention. Before the present invention is described in detail, it is to be noted that in the following description, similar elements are denoted by the same reference numerals, and in the following embodiments, the cold cathode fluorescent lamp is driven to illustrate. , but not limited to driving cold cathode fluorescent lamps. Referring to Figures 3 and 4, the single-stage high-efficiency high-efficiency fluorescent lamp driving circuit of the present invention is electrically connected to an AC power source VAC to drive a cold cathode fluorescent lamp 200'. The high efficiency fluorescent lamp driving circuit comprises: a power rectifying unit 2, an interleaved half-bridge resonant converter 3, and a double-ended input equalizing unit 4. 5 201029518 The power rectifying unit 2 is electrically connected to the AC power supply VAC, and rectifies the AC power supply VAC into a DC power supply. In this embodiment, the AC power supply VAC is a 110V, 60Hz AC power supply supplied by a general utility power supply. The power rectifying unit 2 is a full-bridge rectifier composed of four diodes electrically connected to each other, but an equivalent circuit structure may also be used, and is not limited to the embodiment. Reveal the specific circuit structure. The interleaved half-bridge resonant converter 3 has two first capacitors C1 and C2 electrically connected to the power rectifying unit 2, and two first diodes D1 electrically connected to the first capacitors C1 and C2, respectively. And D2, two first inductors L1, L2 respectively electrically connected to the first diodes D1, D2 are respectively electrically connected to the first inductors L1, L2 and operate at a high frequency (30) kHz ~100kHz) power switches SI, S2, a DC link capacitor CDC in series with the first inductors L1, L2, a DC blocking capacitor Cb in series with the power switches SI, S2, and a DC The resonant inductor Lr and the resonant capacitor Cr connected in series with the blocking capacitor Cb cooperatively correct the DC power input by the power rectifying unit 2 into a sinusoidal waveform and have a high work factor, and output a stable voltage source. The double-ended input current sharing unit 4 has a step-up transformer 41 and two current sharing capacitors 42 electrically connected to the step-up transformer 41 and the cold cathode fluorescent lamp 200. The primary side of the step-up transformer 41 is received. a stabilizing voltage source generated by the interleaved half-bridge resonant converter 3, and a secondary side of the step-up transformer 41 is connected in series with the two current sharing capacitor 42 and the cold cathode fluorescent lamp 200, thereby The stabilizing voltage source generated by the interleaved half-bridge resonant converter 3 is boosted to activate the lighting voltage of the cold cathode fluorescent lamp 200, and 201029518 provides the rating required for the cold cathode fluorescent lamp 200 to operate in steady state. Voltage. Referring to FIG. 4 and FIG. 5, it should be noted that the above-mentioned interleaved half-bridge resonant converter 3 is operated in a discontinuous conduction mode (disc〇ntinu〇us mode). In FIG. 5, the first inductor is used. The current of the device u is the solid line, and the current of the first inductor L2 (U is indicated by a broken line. In addition, it can be known from the literature that the boost converter operates in the discontinuous mode, the input current The ability to correct distortion and power factor is related to the ratio of input peak voltage to output DC voltage. When the input voltage is closer to the output DC link ( voltage (when the ratio of the two is closer to one), the more the input current distortion factor The more serious and the ability to correct the power factor, the interleaving technique used in this embodiment uses the first capacitors C1 and C2 to divide the input voltage source into two equal voltage sources (one for each of the input voltage sources). And forming the two boost converter units with the first diodes D1 and D2 and the first inductors L1 and L2, respectively, so that the ratio of the input voltage source to the output DC link voltage is less than one. To reach The input current distortion factor is small and the power factor correction capability is good. • The purpose of the DC blocking capacitor Cb is to remove and offset the power switches S1 and S2 when they are alternately opened and closed for high frequency interleaving switching. The DC error value in the overall interleaved waveform generated by the pin (DC 〇 ffset) The DC link capacitor CDC is a function of providing a voltage regulation, and the resonant inductor and the resonant capacitor Cr are matched to form a band pass filter. (bandpass filter) to filter out high frequency components in the overall output voltage of the interleaved half-bridge resonant converter 3, so that the output voltage waveform of the interleaved half-bridge resonant converter 3 is an AC sine wave (basic frequency The purpose of forming a half bridge converter using two power switches 7 201029518 S1, S2 is to make the power switches sl, s2 on the switch by this half bridge circuit design The switch can achieve the effect of flexible switching (swipehing) to thereby reduce the switching loss (switehing 1 (10)), that is, the operating frequency of the power switches si, S2 is set higher than the harmonic The resonant inductor Lr and the resonant capacitor are matched with the resonant frequency formed, and the oscillation slots are equal to the inductive load, so that the power switches S1 and S2 can achieve zero voltage switching (talking-reading ching) The crossover loss of the power switches S1 and s2 at the turn-on instant is reduced to increase the efficiency of the overall circuit. The design of the half-bridge is only required to use two power switches S1 and S2, and the number of circuit components can be saved. In this embodiment, the operating frequencies of the power switches S1 and S2 are set to 50 kHz, but they can be adjusted within a range of 3 kHz to 1 kHz, depending on design considerations in actual implementation. set. In this embodiment, the first inductors L1 and L2 respectively have independent iron cores (the physical structure of the iron core is not shown in the figure, and is represented only by an equivalent circuit). Of course, the first inductors L1 and L2 can also be in the form of a common iron core. That is to say, the coils of each of the first inductors L1 and [2 are wound on the same core, thereby saving the number and volume of circuit components, thereby contributing to In the actual implementation of the present invention, the flatness and refinement of the magnetic component volume are determined by the design considerations in actual implementation, and are not limited herein. In addition, in the present embodiment, the power switches S1 and S2 are implemented by using a MOSFET, but may be replaced by an electronic switch such as a BJT or an IGBT, depending on design considerations in actual implementation, and should not be The description disclosed in this embodiment is limited. 201029518
動電路：本發明單級式高功因高效率榮光燈管媒 之第二較佳實施例’大致與前述之第一較佳實施例 :同，相同之處不再贅言，丨中不相同之處在於，該雙端 ·〗入均流單元4具有八個均流電容器42，以藉此同時控制 四支冷陰極螢光燈2〇〇,且由圖7中可清楚看出，每一冷陰 極營光^ 200之電流皆非常相近，確具有電流平衡之優: 丄也就是說，每—冷陰極螢光燈之亮度輸出能夠更為 —致’進而使本實施例相當適合被應用於需要同時驅動多 支冷陰極榮光燈扇的領域中（例如液晶顯示器的背光模組 ，實用性甚佳。 、 當然，該等冷陰極螢光燈2〇〇之數量可因實際使用時 的需要而定，僅需如上述般增加或減少相對應之均流電容 器42即可完成’在此並不加以設限。 由於該冷陰極螢光燈200在設置於一載體上時（例如一 责光模組之鋁背板，圖未示），其與金屬鋁背板之間，或是 其與接至前級電路的導線之間接皆會產生寄生電容，並導 致洩漏電流的產生，且每一冷陰極螢光燈2〇〇自身之阻抗 亦不同，或是受到環境溫度影響等等因素，皆會造成各冷 陰極螢光燈200之操作電流的不平均，因此，本實施例之 另一優點在於’利用雙端驅動之方式，以及該等均流電容 器42的正增量阻抗的特性，可有效的減少該等均流電容器 42所提高之元件耐壓及降低寄生電容所產生的洩漏電流， 並有效的降低溫度計效應，以達到該冷陰極螢光燈2〇〇之 間電流平衡的目的。 201029518 藉由上述設計’本發明單級式高功因高效率冷陰極管 驅動電路’具有下列優點： ^ 電路架構精簡，有效降低整體電路成本： 本發明將習知的功率因數修正電路、直流/直流轉 換器’及直流/交流換流器所組成之三級電路整合成單 一級的交錯式半橋諧振換流器3電路架構，進而大幅 降低電路元件的使用數量，使整體驅動電路之製造成 本能夠大幅降低’其整體電路體積也可更為精簡。 2. 高功因、低輸入電流總諧波失真因數： 參閱圖8、9，為本發明經過實際測試之交流輸入 電壓及電流波形示意圖，而藉由實際測試結果得知， 本發明之功因高達〇·99 ’而輸入電流總諸波失真因素 僅在10°/。左右，足可證明本發明確實具有高功因及低 輸入電流總諧波失真的效果。 3· 整體驅動電路效率高： 本發明由於電路結構精簡，並具有高功因、低輸 入電流總諸波失真之特性，使其電路效率相較於習知 採用二級與三級架構的驅動電路要高，且本發明之交 錯式半橋諧振換流器3具有柔性切換，可降低該等功 率開關S1、S2的開關切換損失，且配合參閱圖i i i 可知’該等功率開關SI、S2具有零電壓切換（zer〇_ voltage switching)的特性，以降低該等功率開關s i、 S2在導通瞬間的交越損失，進而更進一步提昇駆動電 路之整體效率。 10 201029518 4.適合應用於需要同時驅動多支冷陰極螢光燈2〇〇的領 域中，實用性甚佳： 藉由本發明之電路設計，當在需要同時驅動多支 冷陰極螢光燈200時，僅需要對應增加該雙端輸入均 流單元4之均流電容器42的數量，即可同時驅動多支 冷陰極螢光燈200,並不需要增加大量的電子元件來配 合驅動多數支冷陰極螢光燈2〇〇，且每一冷陰極螢光燈 2〇〇之電流非常近似，確實具有均流之功效使該等冷 籲 陰極螢光燈200於作動時皆能夠具有類似的亮度輸出 ，實用性相當佳。 综上所述’本發明將習知的功率因數修正電路、直流/ 直流轉換器，及直流/交流換流器所組成之三級電路整合成 單一級的交錯式半橋諧振換流器3電路架構，再配合該雙 端輸入均流單元4是將該交錯式半橋諧振換流器3所產生 的穩定電壓源升壓為啟動該冷陰極螢光燈2〇〇的點燈電壓 ，以及提供該冷陰極螢光燈200於穩態操作時所需之額定 ® 電壓，以達到「電路架構精簡」、「高功因」、「高效率」、「 適合多燈管配置」，及「均流」之優點，故確實能逹成本發 明之目的。 惟以上所述者，僅為本發明之較佳實施例而已，當不 施以此限定本發明實施之範圍’即大凡依本發明申請專利 範圍及發明說明内容所作之簡單的等效變化與修飾，皆仍 屬本發明專利涵蓋之範圍内。 【圖式簡單說明】 11 201029518 圖1是一系統方塊圖’說明習知用於驅動多數支冷陰 極螢光燈之三級式驅動電路的架構示意； 圖2是一系統方塊圖，說明習知用於驅動多數支冷陰 極螢光燈之二級式驅動電路的架構示意； 圖3是一系統方塊圖，說明本發明單級式高功因高效 率螢光燈管驅動電路之第一較佳實施例與一冷陰極螢光燈 的配置情形（省略電源整流單元）； 圖4是一電路圖’說明該第一較佳實施例之細部電路 結構及其與一冷陰極螢光燈的配置情形； 圖5是一波形圖，說明於該第一較佳實施例之二第一 電感器上的電流狀態； 圖6是一電路圖，說明本發明單級式高功因高效率榮 光燈管驅動電路之第二較佳實施例與四支冷陰極榮光燈的 配置情形； 圖7是一波形圖’說明該第二較佳實施例之各冷陰極 螢光燈的電流狀況； 圖8是一波形圖，說明該第一較佳實施例之輸入電壓 之波形； 圖9是一波形圖，說明該該第一較佳實施例之輸入電 流之波形； 圖10是一波形圖，說明該第一較佳實施例之一交錯式 半橋諧振換流器之功率開關的汲-源極電壓（Vds)波形；及 圖11是一波形圖，說明圖8之功率開關的汲-源極電流 (Ids)波形。 201029518 【主要元件符號說明】 2… .......電源整流單元 Cb ···· •…直流阻隔電容 3 ··. ……交錯式半橋諧振 Cdc… •…直流鏈電容 換流器 Lr…… •…諧振電感器 4. ··· .......雙端輸入均流單 Cr…… •…諧振電容器 元 Vac··" …·交流電源 41 ··· .......升壓變壓器 200… •…冷陰極螢光燈 42··· ……均流電容器 Ili …·電流 C1、 C2 ·第一電容器 IL2 ..... …·電流 D1、 D2 ·第一二極體 Ids..... …電流 · L1、 L2··第一電感器 Vds …電壓 SI、S2··功率開關 13Dynamic circuit: The second preferred embodiment of the single-stage high-efficiency high-efficiency glory lamp medium of the present invention is substantially the same as the first preferred embodiment described above: the same is not the same, and the difference is not the same. In this case, the double-ended in-flow unit 4 has eight current sharing capacitors 42 to thereby simultaneously control four cold cathode fluorescent lamps 2, and it can be clearly seen from FIG. The current of the cathode camp light ^ 200 is very similar, and it has the advantage of current balance: 丄 That is to say, the brightness output of each cold cathode fluorescent lamp can be more 'to make 'this embodiment is quite suitable for being applied to the need At the same time, it drives many cold cathode glory fan blades (such as the backlight module of liquid crystal display, which is very practical). Of course, the number of these cold cathode fluorescent lamps can be determined according to the needs of actual use. It is only necessary to increase or decrease the corresponding current sharing capacitor 42 as described above, which is not limited thereto. Since the cold cathode fluorescent lamp 200 is disposed on a carrier (for example, a light-receiving module) Aluminum back plate, not shown), with metal aluminum back Between them, or the connection to the wires connected to the pre-stage circuit, parasitic capacitance is generated, and leakage current is generated, and each cold cathode fluorescent lamp 2 has its own impedance or is affected by the environment. The influence of temperature and the like may cause unevenness in the operating current of each of the cold cathode fluorescent lamps 200. Therefore, another advantage of this embodiment is that 'the method of using double-end driving, and the positive of the equalizing capacitors 42 The characteristics of the incremental impedance can effectively reduce the component withstand voltage increased by the equalizing capacitor 42 and reduce the leakage current generated by the parasitic capacitance, and effectively reduce the thermometer effect to achieve the cold cathode fluorescent lamp. The purpose of current balancing is as follows. 201029518 By the above design, the single-stage high-efficiency high-efficiency cold cathode tube driving circuit of the present invention has the following advantages: ^ The circuit structure is simplified, and the overall circuit cost is effectively reduced: The present invention will be conventionally known. A three-stage circuit consisting of a power factor correction circuit, a DC/DC converter, and a DC/AC converter is integrated into a single-stage interleaved half-bridge resonant converter. 3 circuit architecture, which greatly reduces the number of circuit components used, so that the manufacturing cost of the overall driver circuit can be greatly reduced. 'The overall circuit volume can also be more streamlined. 2. High power factor, low input current total harmonic distortion factor: See 8 and 9 are schematic diagrams showing the AC input voltage and current waveforms of the present invention, and the actual test results show that the power factor of the present invention is as high as 〇·99 ' and the input current total wave distortion factor is only 10 ° /. Left and right, it can prove that the invention has high power factor and low input current total harmonic distortion effect. 3. High efficiency of the overall driving circuit: The invention has a simple circuit structure, high power factor and low input current The characteristics of the total wave distortion make the circuit efficiency higher than that of the conventional two-stage and three-stage drive circuits, and the interleaved half-bridge resonant converter 3 of the present invention has flexible switching, which can reduce such The switch switching losses of the power switches S1 and S2, and referring to FIG. iii, can be seen that the power switches SI and S2 have zero voltage switching (zer〇_voltage switching). To reduce such power switch s i, S2 is turned on at the moment of the loss cross, and thus further enhance the overall efficiency of the circuit of the movable Qu. 10 201029518 4. It is suitable for use in the field where it is necessary to drive multiple cold cathode fluorescent lamps at the same time. It is very practical: With the circuit design of the present invention, when it is necessary to drive a plurality of cold cathode fluorescent lamps 200 at the same time It is only necessary to increase the number of the equalizing capacitors 42 of the double-ended input current sharing unit 4, so that a plurality of cold cathode fluorescent lamps 200 can be driven at the same time, and it is not necessary to add a large number of electronic components to cooperate with driving most of the cold cathode fluorescent lamps. The light is 2 〇〇, and the current of each cold cathode fluorescent lamp is very similar. It has the effect of current sharing, so that the cold cathode fluorescent lamps 200 can have similar brightness output when they are activated. Very good sex. In summary, the present invention integrates a conventional three-stage circuit consisting of a power factor correction circuit, a DC/DC converter, and a DC/AC converter into a single-stage interleaved half-bridge resonant converter 3 circuit. The architecture, in conjunction with the double-ended input current sharing unit 4, boosts the stable voltage source generated by the interleaved half-bridge resonant converter 3 to the lighting voltage for starting the cold cathode fluorescent lamp 2〇〇, and provides The rated voltage of the cold cathode fluorescent lamp 200 required for steady-state operation to achieve "circuit structure reduction", "high power factor", "high efficiency", "suitable for multiple lamp configurations", and "current sharing" The advantages of the invention are indeed for the purpose of the invention. However, the above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, that is, the simple equivalent changes and modifications made in accordance with the scope of the invention and the description of the invention. All remain within the scope of the invention patent. BRIEF DESCRIPTION OF THE DRAWINGS 11 201029518 FIG. 1 is a system block diagram illustrating the architecture of a conventional three-stage driving circuit for driving a plurality of cold cathode fluorescent lamps; FIG. 2 is a system block diagram illustrating conventional FIG. 3 is a system block diagram showing the first preferred embodiment of the single-stage high-power high-efficiency fluorescent lamp driving circuit of the present invention. FIG. Embodiments and a configuration of a cold cathode fluorescent lamp (the power rectifying unit is omitted); FIG. 4 is a circuit diagram illustrating the detailed circuit configuration of the first preferred embodiment and its arrangement with a cold cathode fluorescent lamp; 5 is a waveform diagram illustrating the current state on the first inductor of the first preferred embodiment; FIG. 6 is a circuit diagram illustrating the single-stage high power high efficiency glory lamp driving circuit of the present invention. FIG. 7 is a waveform diagram illustrating the current state of each of the cold cathode fluorescent lamps of the second preferred embodiment; FIG. 8 is a waveform diagram of the second preferred embodiment and four cold cathode glory lamps; FIG. Explain the first preferred FIG. 9 is a waveform diagram illustrating the waveform of the input current of the first preferred embodiment; FIG. 10 is a waveform diagram illustrating an interleaved half of the first preferred embodiment. The 汲-source voltage (Vds) waveform of the power switch of the bridge resonant converter; and FIG. 11 is a waveform diagram illustrating the 汲-source current (Ids) waveform of the power switch of FIG. 201029518 [Explanation of main component symbols] 2... .......Power rectification unit Cb ···· •...DC blocking capacitor 3 ··. Interleaved half-bridge resonance Cdc... •...DC chain capacitor converter Lr... •...Resonant inductor 4. ··· ....... Double-ended input current sharing single Cr... •...Resonant capacitor element Vac··" ...·AC power supply 41 ··· ... ....Boost transformer 200... •...Cold cathode fluorescent lamp 42···...current sharing capacitor Ili ...·current C1, C2 ·first capacitor IL2 ..... ... current D1, D2 · One diode Ids.....current · L1, L2··first inductor Vds ...voltage SI, S2··power switch 13