1354512 六、發明說明： 【發明所屬之技術領域】 本發明係與冷光片的驅動電路有關，特別是指一穆實 現冷光片多段跳發光之驅動方法及驅動電路。 【先前技術】1354512 VI. Description of the Invention: [Technical Field] The present invention relates to a driving circuit for a cold light sheet, and more particularly to a driving method and a driving circuit for multi-step flashing of a cold light sheet. [Prior Art]
CC
冷光片（Electro Luminescent Panel)基本結構中，主 要組成是將磷光或螢光物質形成之發光材料夾置於雨個導 電電極中，當電極接收到交流偏壓時，發光材料則受到電 場激發以能量轉移方式發光，因在能量轉移過程不會發熱 故一般俗稱為「冷光」。由於冷光片具有耗電量低、不發熱、 聚光性強、不刺眼、使用壽命時間長以及輕薄柔軟等優點， 使得應用範圍廣泛而逐漸取代傳統的廣告看板；至於為了 增加廣告看板料樣性商f宣傳效果，冷光片_動方式 需包含有多段跳的電路控制’使冷光片#變化性的輪出顯 7JT ° 請參閱如第-圖所示為習用冷光片的多段跳驅動電路 卜-整流器10將市用交流電源轉換為直流輸出，提供為 一半橋式換流H 12操作所需電源，半橋式換流器12由一 ，波寬度調變電路14控制其_元件之時序切換，以輸出 交流方波電源至-開關電路16，開關電路16即可以 知序及時間輸❹段跳切換之電源轉動冷光#丨 因以半橋式換流器12輸出之交流電源僅能驅動小 ^之冷光片18 ’而無法驅動大功率之冷光片，繼而造成 1354512 使用上的不方便；再者，縱使換流器12所輸出的方波交流. 電源已經由開關電路16控制為短歇性的方波訊號輸出至 冷光片18’但每一週期之固定時序間隔内仍以持續高準位 偏壓加諸冷光片電極，如此偏壓電場在提供電激發光反應 之同時更造成額外的電流功率致使冷光片快速升溫，將造 成冷光片中發光材料受高溫劣化。 當然，為了避免方波電源造成冷光片產生發熱功率， 可在開關電路16之前先以遽波器將方波訊號轉換為正弦 波訊號，因而僅以最大振幅時之暫態偏壓提供足夠冷光片（-反應所兩電％，但滤波所用的電感元件佔有相當的電路空 間，如此需增加冷光片驅動電路的體積，反而與冷光片輕 薄柔軟的特點不相稱，應用於廣告看板上則使整體美感產 生缺陷。再者，因方波交流訊號為多數奇次諧波所組成， 當中越低次譜波的能量功率越大’必須使用較大電感才得 以遽除，更增加冷光片驅動電路的體積；且為了有效渡除 較高功率的低次諧波，勢必會對基本波的功率造成干擾，C 因而降低冷光片驅動效率。 再者，市售冷光片的多段跳驅動電路變化單調，不易 感受到娛樂效果；若使用冷光片的客戶欲改善冷光片顯示 效果缺乏變化之缺點，則受限於冷光片驅動電路之晶片為 已封裝杈組化之產品，因而無法自行修改晶片内部程式而 需重新設計所需求之驅動程式晶片，繼而導致錯失最好的 廣告商機。 1S1 4 【發明内容】 本發明之主要目的在於提供—種冷光料細動方法 t驅動電路’可有效減少電路空間並提供高 條件。 為達成上述目的，本發明所提供一種冷光片發光驅動 。3 :王橋式換流器、一濾波器、一開關電路及 可程式化{。該全橋式換流器具有多數個輸入端組、 -輸出端組及多數個邏輯電晶體，各該輸人端組電性連接 :邏輯電晶體，用以接收一第一脈波寬度調變訊號以控制 各該邏輯電㈣之導通與鼓運作，該全橋式顯器用以 將該邏輯U難作所需的纽電_換為錢交流訊號 自该輸出端組輸m絲電性連接該全橋式換流器之 輸出端組’肖以將上料波交流城轉換為正紐訊號； 該開關電路具有多數個開關元件，各該開關元件具有一控 制端及-導流端，各該控制端用以接收—第二脈波寬度調 i訊號以控制各該開關元件之導通與截止運作，該些開關 元件之導流端電性連接該濾波器，以將職波器產生之正 弦波訊號提供給上述冷光片發光；該可程式化晶片用以產 生邊第-脈波寬度調變訊號以及多數個該第二脈波寬度 調變訊號’該第-脈波寬度調變訊號以相位互補之不同時 序分別㈣相接之二該邏輯電晶體之導通運作。 本發明所提供-種冷光片發光驅動方法係包含有以下 步驟： a)提供振幅及頻率相異之一三角波形訊號及一正弦波 1354512 形訊號’該三角波形訊號頻率為該正弦波形訊號頻率之整 數倍’比較該三角波形訊號與正弦波形訊號之振幅並產生 一第一脈波寬度調變訊號； b) 以該第一脈波寬度調變訊號於相位互補之不同時序 分別控制一全橋式換流器之二邏輯電晶體依序導通運作， 使該全橋式換流器輪出方波交流訊號； c) 提供一遽波器將上述交流方波訊號轉換為正弦波訊 號；以及， d) 提供多數個第二脈波寬度調變訊號，分別控制上述 正弦波訊號以多種不同時段輸入上述冷光片。 【實施方式】 為了詳細說明本發明之結構、特徵及功效所在，茲舉 以下較佳實施例並配合圖式說明如後，其中： 第一圖為本發明最較佳實施例所提供之電路功能方塊 圖； 第二圖為上述最較佳實施例所提供之電路結構示音 圖； ~ ^第四圖為上述最較佳實施例所提供第一脈波寬度調變 ^唬之產生方法，其中第四圖A為調變使用之正弦波形與 一角波形之時序變化，第四圖B為與第四圖A對應之第一 脈波寬度調變訊號之時序變化。 °月參閱第二及第三圖所示，為本發明第一較佳實施例 6 所提供冷光片之-驅動電路2，具有一整流器2〇、一全橋 式換流器3G、—錢$ 4〇、-開關電路5G以及—可程^ 化晶片60，其中： 該整流器20具有一交流電源22、一抗干擾電路24以 及一全橋式整流魏26 ;該交流《 22為已將市用交冷 電源經變_換處理所輸出者，該抗干擾電路24用以防: 變壓=件對整體電路造成電磁干擾，目此先敎流電源η 進仃向頻紐處理n該全橋式整流電路26將 為直流電源，以提供為該全橋式換流器3G之錢操作。去 然’本實施例所提供該整流器2G主要為將已經變壓之: 源之用，係以提供該驅動電路2有 _說：二;=20之各構成元件在此僅為 個輸=:^:==電_、多數 為以，兩相互串接之第一、第二邏輯電晶體切 二、第四邏輯電晶體326、328 及第 可使古亥敕、、衣51 % 才互並接形成之橋式電路，In the basic structure of the Electro Luminescent Panel, the main component is that the luminescent material formed by the phosphorescent or fluorescent material is sandwiched in the rain conductive electrode. When the electrode receives the AC bias, the luminescent material is excited by the electric field to generate energy. The transfer mode emits light, which is commonly referred to as "cold light" because it does not generate heat during the energy transfer process. Because the cold light sheet has the advantages of low power consumption, no heat generation, strong concentrating, no glare, long service life, and light and soft, it has a wide range of applications and gradually replaces the traditional advertising billboards. As for increasing the advertising placard Business f publicity effect, cold light film _ dynamic mode needs to include multi-segment circuit control 'to make cold light film # variability round out 7JT ° See the picture shown in Figure - Figure for the conventional cold light film multi-step drive circuit - The rectifier 10 converts the commercial AC power into a DC output, and supplies the power required for half-bridge commutation H 12 operation. The half-bridge inverter 12 is controlled by a wave width modulation circuit 14 to control the timing switching of the components. In order to output the AC square wave power supply to the -switch circuit 16, the switch circuit 16 can be used to control the sequence and the time-switching power supply is switched to the cold light. The AC power supply outputted by the half-bridge converter 12 can only drive small. ^The cold light sheet 18' can not drive the high-power cold light sheet, which in turn causes the inconvenience in the use of 1354512; in addition, even the square wave output from the inverter 12 is output. The power supply has been switched by the switch circuit 16 The short-wavelength square wave signal is output to the luminescent sheet 18' but is applied to the luminescent sheet electrode at a constant high level bias during a fixed time interval of each period, such that the biasing electric field provides an electrical excitation light response At the same time, the additional current power causes the cold light sheet to heat up rapidly, which will cause the luminescent material in the cold light sheet to be deteriorated by high temperature. Of course, in order to avoid the generation of heating power of the cold light sheet caused by the square wave power supply, the square wave signal can be converted into a sinusoidal signal by the chopper before the switching circuit 16, so that sufficient cold light is provided only for the transient bias at the maximum amplitude. (-Reactive two-electricity, but the inductance component used for filtering occupies a considerable circuit space. Therefore, it is necessary to increase the volume of the cold-storage driving circuit, but it is not commensurate with the light and soft characteristics of the cold-light film, and the overall aesthetic is applied to the advertising billboard. In addition, because the square wave AC signal is composed of most odd harmonics, the higher the energy power of the lower-order spectrum wave, the larger the inductance must be used, and the volume of the cold-film driver circuit is increased. In order to effectively remove the lower harmonics of higher power, it is bound to interfere with the power of the fundamental wave, and C thus reduces the driving efficiency of the cold film. Furthermore, the multi-step drive circuit of the commercially available cold light sheet changes monotonously and is not easy to feel. To the entertainment effect; if the customer using the cold light sheet wants to improve the shortcomings of the lack of change of the cold light sheet display effect, it is limited by the cold light sheet driving circuit The chip is a packaged product, so it is impossible to modify the internal program of the chip and redesign the required driver chip, which leads to the missed best advertising opportunity. 1S1 4 [Summary] The main purpose of the present invention is to Providing a cold-light fine-motion method t-driving circuit' can effectively reduce circuit space and provide high conditions. To achieve the above object, the present invention provides a cold-light sheet illumination driving. 3: Wangqiao converter, a filter, a switching circuit and programmable (the full-bridge converter has a plurality of input groups, - an output group and a plurality of logic transistors, each of the input groups is electrically connected: a logic transistor for Receiving a first pulse width modulation signal to control the conduction and drum operation of each of the logic powers (4), wherein the full bridge type display is used to convert the logic U into a required power signal to be exchanged for the money communication signal from the output The end group of the m wire is electrically connected to the output end group of the full bridge converter to convert the upper wave AC city into a positive signal; the switch circuit has a plurality of switching elements, each of the switching elements a control terminal and a current-conducting terminal, each of the control terminals is configured to receive a second pulse width modulation signal to control the on and off operations of the switching elements, and the guiding ends of the switching elements are electrically connected to the filtering And supplying the sine wave signal generated by the wave device to the cold light sheet; the programmable wafer is configured to generate an edge-pulse width modulation signal and a plurality of the second pulse width modulation signals The first pulse width modulation signal operates in parallel with the different timings of the phase complementation (4). The cold light sheet illumination driving method provided by the present invention comprises the following steps: a) providing amplitude and A frequency difference is a triangular waveform signal and a sine wave 1354512 shaped signal 'the triangular waveform signal frequency is an integer multiple of the sinusoidal waveform signal frequency' comparing the amplitude of the triangular waveform signal with the sinusoidal waveform signal and generating a first pulse width Modulating the signal; b) controlling the second logic transistor of the full bridge converter to be sequentially guided by the first pulse width modulation signal at different timings of phase complementation , causing the full bridge converter to rotate a square wave AC signal; c) providing a chopper to convert the AC square wave signal into a sine wave signal; and, d) providing a plurality of second pulse width modulation signals The sinusoidal signals are respectively controlled to be input to the luminescent sheet in a plurality of different time periods. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to explain the structure, features, and advantages of the present invention in detail, the following description of the preferred embodiments The second figure is a circuit diagram of the circuit structure provided by the above-described most preferred embodiment; ~ ^ FIG. 4 is a method for generating a first pulse width modulation according to the above preferred embodiment, wherein The fourth graph A is the timing change of the sinusoidal waveform and the one-corner waveform used for modulation, and the fourth graph B is the timing variation of the first pulse width modulation signal corresponding to the fourth graph A. Referring to the second and third figures, the cold-light film-driving circuit 2 provided by the first preferred embodiment 6 of the present invention has a rectifier 2〇, a full-bridge converter 3G, and a money $ 4〇, - switch circuit 5G and - process wafer 60, wherein: the rectifier 20 has an AC power source 22, an anti-interference circuit 24 and a full bridge rectifier Wei 26; the exchange "22 has been used The anti-interference circuit 24 is used to prevent:: Transforming voltage = component causes electromagnetic interference to the whole circuit, and the first turbulent power supply η enters the hopping frequency processing n the full bridge type The rectifier circuit 26 will be a DC power source to provide the money for operation of the full bridge converter 3G. The rectifier 2G provided in this embodiment is mainly for the purpose of converting the source: for providing the driving circuit 2, the constituent elements of the driving circuit 2 are only one input == ^:==Electric_, majority is, the first and second logical transistors are connected in series, the second logic transistor 326, 328 and the first can make the ancient Hai, and the clothing 51% Connected to form a bridge circuit,
使……0所輸出之直流 流訊號由該#_έΒ K这弭得換為方波父 竭心組36輸出；各該輪入端組3 电性連接各該邏輯雷s ,VM 化物半㈤體财實_供由金屬氧 化物+導體製奴該_電晶體32 34用以魏脈波寬度觸 料輸入鳊组 閘極使之導诵盥进L 輪入各该邏輯電晶體32 二1 截止運作。上述脈波寬度調變—Π 步控制該第-、第四邏輯 域係以同 科冤曰曰體322、328之運作，以及g f 1354512 訊號相位互補之時序同步控制該第二、第三邏輯電晶體 324、326之運作，·並且，為使該第一與第四邏輯電晶體 322、328或該第二與第三邏輯電晶體324、326接收同步 之脈波寬度調變訊號，係對應由一觸發元件同步導通接 收，·以本實施例所提供之該觸發元件為具有提供單向電路 傳輸功能之_合元件’其巾，該些輸人端組34之一第一 及一第四輸入端組342、348分別接設一第一及一第四光耦 合元件382 ' ’該第-及第四光輕合元件382、聊再The DC stream signal outputted by 0 is changed from the #_έΒ K to the output of the square wave parent group 36; each of the wheel end groups 3 is electrically connected to each of the logic s, the VM compound half (five) body Financial _ for metal oxide + conductor slaves _ transistor 32 34 for Wei pulse width touch input 鳊 group gate to lead into L round each logical transistor 32 2 1 cut-off operation . The pulse width modulation-step control of the first and fourth logical domains simultaneously controls the second and third logic powers by the operation of the same body 322, 328 and the complementary phase of the gf 1354512 signal phase. The operation of the crystals 324, 326, and, in order for the first and fourth logic transistors 322, 328 or the second and third logic transistors 324, 326 to receive synchronized pulse width modulation signals, A triggering component is synchronously turned on, and the triggering component provided in this embodiment is a component having a unidirectional circuit transmission function, and a first and a fourth input of the input terminal group 34. The first and fourth optical coupling elements 382 ′′ are respectively connected to the end groups 342 and 348, and the first and fourth optical coupling components 382
C 共同電性連接該可程式化晶片6G之—第—接腳62，該些 輸入端組34之-第二及-第三輸入端組344、346分別接 設-第二及-第三光耗合元件384、谢，該第二及第三光 麵合元件384、386再共同電性連接該可程式化晶片6〇之 -第二接腳64。因此該可程式化晶片⑼提供—第一脈波 寬度調變訊號’於-第-相位條件之時序範圍内自該第一 接腳62控制觸發該第一與第四光Λ合元件382、388，與 ，第-相位條件互補之-第二相位條件之時序範圍内自該 第二接腳64控綱發該第二與第三光耗合元件 384、386， 則可由該第-紐寬度調變喊於相位·之不同時序分 別對應導通該第-、第四邏輯電晶體322、328及第二、第 三邏輯電晶體324、326 ;再者，由於該些光轉合元件撕、 3以386观為具有提供單向電路傳輸功能之觸發元件， 可防止該王橋式換机益3G之電流迴路回饋影響該可程式 化曰曰片60之運作’當然’該些輸入端組所接設之觸發 兀件在此僅為舉例說明，並非做為限制要件。 8 該遽'波器40電性連接該全橋式換流器3Q之輸出端組 36係乂夕數個;慮波儿件42、44將上述方波交流訊號轉換 為正弦波訊號；該些濾波元件42、44為對應該全橋式換流 器30所輪出交流訊狀鮮及電流振幅而具有特定之電 感、電容。 為了得_全橋式錢要較流織，該可程 式化曰曰片6G湘如第四圖a所^之正弦式脈波寬度調變 技術產生該第—脈波寬度調變訊號；實驗上，由-正弦波 开V 虎Vcon(t)與-二角波形訊號Vtri(t)做比較，正弦波振 幅為^且頻率為fe’三角波振幅為Vt且頻率為ft;定義 振幅調制指數mv為Vc/Vt，該第一脈波寬度調變訊號所調 制產生之振幅可控制該全橋式換流器3〇之邏輯電晶體 322、324、326、328導通運作時之通道大小，進而控制上 述父流訊號之輸出電流大小；頻率調制指數她， 決疋該全橋式換流H 3G之邏輯電晶體32之開關切換頻 率，fc决之該全橋式換流器3〇所輸出交流訊號之基頻頻 率。凊配合第四圖B參照，當該第一脈波寬度調變訊號之 相位條件為正弦波之振幅大於三角波振幅時 ，則同時觸發 該第一與第四光輕合元件382、388或該第二與第三光輕合 疋件384、386其中之_組合，使對應該全橋式換流器3〇 之第一與第四邏輯電晶體322、328或第二與第三邏輯電晶 體324、326導通；當該第—脈波寬度調變訊號之相位條件 為二角波之振幅大於或等於正弦波振幅時，則同時觸發另 一組·合之第二與第三光耦合元件384、386或第一與第四光 1354512 耦合元件382、388，並使對應之第二與第三邏輯電晶體 324、326或第一與第四邏輯電晶體322、328導通。 由於上述正弦式脈波寬度調變技術所使用三角波的頻 率越大’即可使該些邏輯電晶體322、324、326、328為越 高頻的切換運作，亦使該全橋式換流器3 〇所輸出方波交流 訊號之基頻夾帶諧波幾乎皆為高次諧波，低次諧波部分甚 小而可以忽略；對於後級之該濾波器4〇而言，由電感公式 XL = 2；rfL可知，當濾波頻段越高，濾波所需要的電感值 就可越小。如此一來，低電感對基本波影響降低，也能集（· 中滤掉不要的咼次諧波；同時，低電感元件所需佔用之電 路空間體積可大幅縮小’達到符合冷光片輕薄的特點。 該開關電路50具有多數個開關元件，由該可程式化晶 片60控制分別於不同時段切換導通，將上述濾波器4〇產 生之正弦波訊號以不同時段及不同時序間隔切換輸出至上 述冷光片不同局部之電極。以本實施例所提供由矽控電晶 體製成之該開關元件52為例，各該開關元件具有一控制端( 522及一導流端524;該控制端522用以接收脈波寬度調變 、 訊號以控制該開關元件52之導通或戴止運作，該導流端 524電性連接該濾波器40,因此各該開關元件52之控制端 由脈波寬度調變訊號中獲得足夠之導通限電流時，則 將該濾波器40產生之正弦波訊號導通並驅動上述冷光片 發光。各該控制端522接設一光耦合元件54，可防止該開 -關元件52之電流迴路回饋影響該可程式化晶片6〇之運 作；因此由該可程式化晶片60提供有多數個第二脈波寬度 10 1354512 調變訊號’即可於不啊相發輕 a 控制各該開關元件52 σ凡，進而 述：：多段跳及亮度變化: 多段_亮電二=== 需先計算冷光片之 開發平，可程式化二 第= -脈波見賴變崎，时職 f. e ，，及該二 之開關切換頻率影響，即可實現冷 二 :化因而使裝置鞠動電路2之冷光収具其彈性化= 功能’更具市場競爭性。再者’該驅動電路2使用 °知式化晶片60作為整體電路核心控制器，以可 的第H脈錢度機峨㈣電路 的 與截止時間的長短，即可達到控制電路使輸出電^^通 =部份硬體電路功能’因而具有簡化電路及穩定輪^的 ‘上所陳，本發明於前述實施例中所揭露的構 件，僅為舉例說明，並非用來限制本案之範圍，其他等元 凡件的替代或變化’亦應為本案之申請專魏圍所涵蓋放 【圖式簡單說明】 第一圖為習用冷光片驅動電路之電路功能方塊圖； 第二圖為本發明最較佳實施例戶斤提供之電⑬功能方塊 圖； 第三圖為上述最較佳實施例所提供之電路結構示意 圖； …第四圖為上述最較佳實關所提供第—脈波寬度調變 K號之產生方法，其中第四圖A為調變使用之正弦波形與 三角波形之時序變化，第四圖B為與第四圖A對應之第一 脈波寬度調變訊號之時序變化。 【主要元件符號說明】 2驅動電路 20整流器 24抗干擾電路 30全橋式換流器 322第一邏輯電晶體 326第三邏輯電晶體 34輸入端組 344第二輸入端組 348第四輪入端組 382第一光耦合元件 386第三光_合元件 40濾波器 22交流電源 26全橋式整流電路 32邏輯電晶體 324第二邏輯電晶體 328第四邏輯電晶體 342第一輸入端組 346第三輸入端組 36輸出端組 384第二光搞合元件 388第四光耦合元件 42、44濾波元件C is electrically connected to the first pin 62 of the programmable chip 6G, and the second and third input groups 344 and 346 of the input group 34 are respectively connected to the second and third light The second and third opming elements 384 and 386 are electrically connected to the second pin 64 of the programmable chip 6 . Therefore, the programmable chip (9) provides a first pulse width modulation signal to control the first and fourth photocoupling elements 382, 388 from the first pin 62 within a timing range of the -phase phase condition. And the second and third light-consuming components 384, 386 are controlled from the second pin 64 in the timing range of the second phase condition complementary to the first phase condition, and the first-new width can be adjusted The different timings of the phases are respectively turned on to respectively turn on the first and fourth logic transistors 322 and 328 and the second and third logic transistors 324 and 326; further, since the light-converting elements are torn, 3 The 386 is a trigger component that provides a one-way circuit transmission function, which prevents the current loop feedback of the king bridge type switch 3G from affecting the operation of the programmable chip 60. Of course, the input groups are connected. The triggering elements are for illustrative purposes only and are not intended to be limiting. 8 The 遽 'wave device 40 is electrically connected to the output end group 36 of the full bridge converter 3Q; the wave device 42 and 44 convert the square wave AC signal into a sine wave signal; The filter elements 42 and 44 have a specific inductance and capacitance corresponding to the alternating current and current amplitude of the full bridge converter 30. In order to obtain _ full bridge type money to be more weaving, the sinusoidal pulse width modulation technique of the programmable cymbal 6G Xiang as shown in the fourth figure a produces the first-pulse width modulation signal; experimentally By - sine wave open V Tiger Vcon(t) and - two-angle waveform signal Vtri(t), the sine wave amplitude is ^ and the frequency is fe' triangle wave amplitude is Vt and the frequency is ft; defining the amplitude modulation index mv is Vc/Vt, the amplitude generated by the modulation of the first pulse width modulation signal can control the channel size of the logic transistors 322, 324, 326, and 328 of the full bridge converter 3 导, thereby controlling the above The output current of the parent stream signal; the frequency modulation index, she decides the switching frequency of the logic transistor 32 of the full bridge type commutating H 3G, and the fc determines the output of the AC signal of the full bridge converter 3 Base frequency. Referring to FIG. 4B, when the phase condition of the first pulse width modulation signal is that the amplitude of the sine wave is greater than the amplitude of the triangular wave, the first and fourth optical coupling elements 382, 388 or the same are triggered simultaneously. The combination of the second and third optical coupling members 384, 386, such that the first and fourth logic transistors 322, 328 or the second and third logic transistors 324 corresponding to the full bridge converter 3 And 326 is turned on; when the phase condition of the first pulse width modulation signal is that the amplitude of the two-dimensional wave is greater than or equal to the amplitude of the sine wave, the other group of the second and third optical coupling elements 384 are simultaneously triggered. 386 or first and fourth light 1354512 couple elements 382, 388 and cause corresponding second and third logic transistors 324, 326 or first and fourth logic transistors 322, 328 to conduct. Since the frequency of the triangular wave used in the sinusoidal pulse width modulation technique is larger, the logic transistors 322, 324, 326, and 328 can be switched to operate at a higher frequency, and the full bridge converter is also made. 3 The fundamental frequency entrained harmonics of the output square wave AC signal are almost all higher harmonics, and the lower harmonic parts are very small and can be ignored. For the latter stage of the filter 4〇, the inductance formula XL = 2; rfL knows that the higher the filter frequency band, the smaller the inductance value required for filtering. In this way, the low inductance has a reduced influence on the fundamental wave, and it can also collect (··············································································· The switch circuit 50 has a plurality of switching elements, and the programmable chip 60 controls the switching of the conduction in different time periods, and the sinusoidal signals generated by the filter 4〇 are switched and output to the cold light sheet at different time intervals and different time intervals. For example, the switching element 52 made of the 矽 control transistor is provided as an example, each of the switching elements has a control end (522 and a current guiding end 524; the control end 522 is configured to receive The pulse width modulation and the signal are controlled to control the conduction or the wearing operation of the switching element 52. The guiding end 524 is electrically connected to the filter 40, so that the control end of each of the switching elements 52 is modulated by the pulse width modulation signal. When a sufficient on-current is obtained, the sine wave signal generated by the filter 40 is turned on and the light-emitting sheet is driven to emit light. Each of the control terminals 522 is connected to an optical coupling element 54. The current loop feedback of the on-off component 52 affects the operation of the programmable wafer 6; therefore, the programmable wafer 60 is provided with a plurality of second pulse widths 10 1354512 modulation signals'. The light-emitting a controls each of the switching elements 52 σ , and then describes: multi-segment jump and brightness change: multi-segment _ bright electric two === need to calculate the development of cold light film first, can be programmed two second = - pulse see Lai Naiqi, the time f. e, and the switching frequency of the two switches, can achieve the cold two: so that the device chills the cold light of the circuit 2 to elasticize = function 'more market competitive. Furthermore, the driving circuit 2 uses the known silicon wafer 60 as the overall circuit core controller, and the length of the circuit can be reached by the length of the circuit of the H-th pulse machine (4), and the output circuit can be controlled. The components of the present invention are disclosed in the foregoing embodiments. The components disclosed in the foregoing embodiments are merely illustrative and are not intended to limit the scope of the present invention. The replacement or change of Yuanfan's should also The application for this case is covered by Weiwei. [The following is a simplified diagram of the circuit diagram. The first figure is the circuit function block diagram of the conventional cold light film driver circuit. The second figure is the power 13 function block diagram provided by the most preferred embodiment of the present invention. The third figure is a schematic diagram of the circuit structure provided by the above-described most preferred embodiment; the fourth figure is a method for generating the first pulse width modulation K number provided by the above-mentioned best practice, wherein the fourth picture A is The timing variation of the sinusoidal waveform and the triangular waveform used in the modulation is changed, and the fourth graph B is the timing variation of the first pulse width modulation signal corresponding to the fourth graph A. [Description of main component symbols] 2 drive circuit 20 rectifier 24 resistance Interference circuit 30 full-bridge converter 322 first logic transistor 326 third logic transistor 34 input terminal group 344 second input terminal group 348 fourth wheel-in end group 382 first optical coupling element 386 third light-combined Element 40 filter 22 AC power supply 26 full bridge rectifier circuit 32 logic transistor 324 second logic transistor 328 fourth logic transistor 342 first input group 346 third input group 36 output group 384 second light Component 388 Fourth optical coupling element 42, 44 filter element
C IS] 12 1354512 50開關電路 52開關元件 522控制端 524導流端 60可程式化晶片 64第二接腳 Vcon⑴正弦波形訊號 Vtri⑴三角波形訊號 62第一接腳 Vc正弦波振幅 V t二角波振幅 13C IS] 12 1354512 50 switch circuit 52 switching element 522 control terminal 524 current-conducting terminal 60 can be programmed wafer 64 second pin Vcon (1) sinusoidal waveform signal Vtri (1) triangular waveform signal 62 first pin Vc sine wave amplitude V t two-angle wave Amplitude 13