1277280 修(更)正替換頁1277280 Repair (more) replacement page
九、發明說明： 一 ~~—~~J 【發明所屬之技術領域】 本發明係有關-種推挽式反流II電路，尤指_種採用推挽式電壓驅動 訊號驅動變壓單元作動而可提升變壓單元輸出功率之反流器電路。 【先前技術】 目前市售桌上及筆記型電腦、PDA、Webpad所用的液晶顯示螢幕⑽）， 都是利用-種驅動裝置輸出高電壓，透過陶究變壓器用以點亮冷陰極燈管 (CCFL)，以下即針對習知技藝之驅動裝置茲分述如下： 第1圖為一般驅動CCFL冷陰極燈管點亮之驅動裝置，包括有· 一電源 φ 單元，一脈寬調變(PWM)控制單元，一驅動單元（M0SFET)，一壓電陶瓷 變壓器與-負載之冷陰極燈管所構成，當啟動輸人電壓時，驅動單元立即 驅動壓電陶錢壓器作動經由逆/正麵效應，驅動冷陰極燈管作動點亮， 脈寬調變（PWM)控制單元透過電流回授制燈管的管電流，以輸出一共振 頻率，經驅動單元及變壓變壓器可控制CCFI^管的平均電流。因此所產生 光投射至背光板顯示畫面。 壓電陶兗變壓器之輸出功率大小係依照輸入電壓大小，相同在負載冷 陰極燈管，輸出功率決定所能點亮長度，由於顯示螢幕（尤其是液晶電視）， 越來越趨向大尺寸規格設計，冷陰極燈管若不採舰燈管交錯方式排列， 谢木用長燈管配置，但是，長燈管所須管電流較高，相對功率也需求 較鬲，為此，本申請人提出申請並獲准為公告第557〇73號「應用於長燈管 之壓電式觀祕之乡組貞載鶴電路」，訴求二並聯連接且電力輸入端極 1*生相反之壓電陶变變壓器在接收驅動單元相同相位之電壓驅動訊號，以推 挽方式輸出她相反之電壓至冷陰極燈管，藉此獲得輸出電流均勻且較大 功率輸出及阻抗匹配較佳之特性。 1專利雖已解決長燈管功率問題，但是除了長度外，燈管數因尺寸 加之增加’但若以該案專利而言，每—燈管都必須配置—組壓電陶 竟變壓器’不僅成本較高，且衍生之卫作温度及電路板體赫是增加業者 設計困擾。 【發明内容】 1277280 I年月曰修(更)正替 本發明之主要目的，在於解決上述之缺失，避免缺失的存在，本發明 人經多次研發，同樣採用推挽式電壓驅動訊號，但透過反流器電路之變壓 單元之一電力輸入端與電源單元間連接且由一控制單元及二組功率開關組 成之電力驅動單元輸出二組相同頻率但相反相位之驅動訊號至該二電力輸 入端’如是構成一推挽式電壓驅動訊號驅動變壓單元作動而可提升變壓單 元輸出功率之反流器電路，藉此將可節省另一變壓單元配置，相對製作成 本降低外，更降低整體電路板體積。 【實施方式】 有關本發明之詳細說明及技術内容，現就配合圖式說明如下： • 請參閱『第2圖所示』，係本發明第一實施例之驅動電路示意圖，如圖 所示：本發明係接收電源單元1〇輸入之電力訊號經共振變壓後驅動負載15 作動，此處之電源單元1〇係指交流電經整流之直流電，該輸入之電力訊號 可為經過功率因數調整器修正之直流訊號（依現有技術多為i 2v〜48 V)’或者為直接整流之脈衝直流訊號（依現有技術為1 5 5 V )，該反流 器電路係配置於電源單元10及負載15之間，其中，該反流器電路具有一 變壓單元14，該變壓單元14具有一連接負載15之電力輸出端143及二電 力輸入端141、142，於該二電力輸出端143與電源單元10間連接一電力驅 動單元’該電力驅動單元係接收該電力訊號並對變壓單元14輸出二組相同 % 頻率但相反相位之驅動訊號13卜132至該二電力輸入端14卜142，如是構 成一推挽式電壓驅動訊號131、132驅動變壓單元14作動之反流器電路。 第一實施例之電力驅動單元係由一控制單元n及二組功率開關12a、 12b組成，上述變壓單元14可為繞線式變壓器或壓電式變壓器，若為壓電 式變壓器，則與功率開關12a、i2b之間配置有電感13a、13b，為便於解說 本發明，以下均以壓電式變壓器說明，其中，該控制單元η為一脈寬調變 器（PWM) ’功率開關12a、12b則為功率電晶體（M0SFET)，當電源單元10 輸入電路訊號，功率開關12a、i2b隨即啟動，且控制單元η接收負載π 回授共振頻率訊號151時，將輸出兩組相同頻率但相反相位之驅動訊號 131、132至功率開關I2a、既，此時，功率開關12a、i2b以該控制單元 π輸出之頻率切割電力訊號至電感13a、13b，電感13a、13b將修正功率 1277280 ;-! i t月戶修(更)正替換貝Nine, invention description: a ~~-~~J [Technical field of the invention] The present invention relates to a push-pull type reverse current II circuit, especially a push-pull voltage drive signal driven by a transformer unit A inverter circuit that can increase the output power of the transformer unit. [Prior Art] Currently, liquid crystal display screens (10) used in commercially available desktops and notebook computers, PDAs, and Webpads use high-voltage output devices to illuminate cold cathode lamps (CCFLs). The following is a description of the driving device for the conventional art: The first picture shows the driving device for driving the CCFL cold cathode lamp to light, including a power supply φ unit, and a pulse width modulation (PWM) control. a unit, a driving unit (M0SFET), a piezoelectric ceramic transformer and a load-carrying cold cathode lamp. When the input voltage is activated, the driving unit immediately drives the piezoelectric potter to operate via an inverse/positive effect. The cold cathode lamp is driven to illuminate, and the pulse width modulation (PWM) control unit transmits the tube current of the lamp through the current to output a resonance frequency, and the average current of the CCFI tube can be controlled by the driving unit and the transformer. . Therefore, the generated light is projected onto the backlight display screen. The output power of the piezoelectric ceramic transformer is in accordance with the input voltage, the same in the cold cathode lamp of the load, the output power determines the length that can be lit, and the display screen (especially the LCD TV) is more and more oriented to the large size specification. If the cold cathode lamps are not arranged in a staggered manner, the Xiemu is configured with a long lamp. However, the long tube requires a higher current and the relative power is also relatively low. Therefore, the applicant applies. It has been approved as Announcement No. 557〇73, “Piezo-type Group of Capsules for Long Lamps,” and calls for a piezoelectric transformer transformer with two parallel connections and the opposite end of the power input terminal. The voltage driving signal of the same phase of the driving unit is received, and the opposite voltage is outputted to the cold cathode lamp tube in a push-pull manner, thereby obtaining a characteristic that the output current is uniform and the power output and impedance matching are better. Although the patent has solved the problem of long lamp power, in addition to the length, the number of lamps has increased due to the size. However, in the case of the patent, each lamp must be configured - the group of piezoelectric ceramic transformers not only cost Higher, and the derivative temperature and circuit board body are increasing the design troubles of the industry. SUMMARY OF THE INVENTION The main purpose of the present invention is to solve the above-mentioned shortcomings and avoid the existence of a defect. The inventors have repeatedly developed a push-pull voltage-driven signal, but An electric drive unit connected to the power input unit through one of the power conversion units of the inverter unit and connected by the control unit and the two sets of power switches outputs two sets of driving signals of the same frequency but opposite phases to the two power inputs If the terminal ' constitutes a push-pull voltage driving signal to drive the transformer unit to operate, the inverter circuit can increase the output power of the transformer unit, thereby saving another transformer unit configuration, and reducing the production cost, and lowering Overall board size. [Embodiment] The detailed description and technical contents of the present invention will now be described as follows: • Please refer to FIG. 2, which is a schematic diagram of a driving circuit according to a first embodiment of the present invention, as shown in the figure: The invention is characterized in that the power signal input by the receiving power unit 1 is driven by the resonance voltage to drive the load 15 to operate. Here, the power unit 1 refers to the alternating current rectified direct current, and the input power signal can be corrected by the power factor adjuster. The DC signal (usually i 2v~48 V according to the prior art) or the direct rectified pulsed DC signal (1 5 5 V according to the prior art) is configured in the power supply unit 10 and the load 15 The inverter device has a transformer unit 14 having a power output terminal 143 and two power input terminals 141 and 142 connected to the load 15, and the power output unit 143 and the power unit 10 are connected to an electric drive unit. The electric drive unit receives the electric power signal and outputs two sets of the same % frequency but opposite phase drive signals 13 to 132. The input terminal 14 142 is a inverter circuit configured to drive the voltage swing unit 14 to drive the voltage swing unit 14 . The electric drive unit of the first embodiment is composed of a control unit n and two sets of power switches 12a, 12b. The transformer unit 14 can be a wound transformer or a piezoelectric transformer. If it is a piezoelectric transformer, Inductors 13a, 13b are disposed between the power switches 12a, i2b. For ease of explanation of the present invention, the following description is based on a piezoelectric transformer, wherein the control unit η is a pulse width modulator (PWM) 'power switch 12a, 12b is a power transistor (M0SFET). When the power unit 10 inputs a circuit signal, the power switches 12a and i2b are activated, and the control unit η receives the load π feedback resonant frequency signal 151, and outputs two sets of the same frequency but opposite phases. The driving signals 131, 132 to the power switch I2a, at this time, the power switches 12a, i2b cut the power signal to the inductors 13a, 13b at the frequency of the output of the control unit π, and the inductances 13a, 13b will correct the power 1277280; -! it The monthly repair (more) is replacing the shell
pa «〇 ] 95ί 10, I H2a、12b之導通方波波形為弦波波形，從圖中可以明顯看出，由於驅 動訊號13卜132相反，因此，當輸入變壓單元14正極電力輸入端141之 驅動訊號131為正半週電力訊號時，變壓單元14負極電力輸入端之驅動信 竣132則為負半週電力訊號，反之亦然，因此，基於其一驅動訊號131為 一相弦波訊號，另一驅動訊號132則為反相弦波訊號，如此即可對變壓單 元14產生推挽式電壓驅動，令變壓單元在雙重輸入電壓驅動下由電力 輸出端143產生最大功率輸出驅動負載π。 明參閱『第3圖所示』’係本發明第二實施例之驅動電路示意圖，如圖 所示：基於各種控制單元11設計不同，若該控制單元U係輸出二組相同 鲁頻率且相同相位之驅動訊號，則於任-功率開關12b與控制單元η之間設 有-波形反相器ill，當控制單元η輸出為相同正相驅動訊號時，藉此波 形反相器111將其-正相驅動訊號轉換為反相驅動訊號，使輸入變壓單元 之驅動訊號13卜132相反相位，如此即可達成相同第一實施例之功效。 綜上所述僅為本發明的較佳實施例而已，並非用來限定本發明之實施 範圍。即凡依本發明申請專利範圍之内容所為的等效變化盘料，皆應為 本發明之技術範疇。 1277280 修(更)正替換頁 【圖式簡單說明】 第1圖，係習用變壓反流器驅動電路示意圖 第2圖，係本發明第一實施例之驅動電路示意圖 第3圖，係本發明第二實施例之驅動電路示意圖 【主要元件符號說明】 10........ .....電源單元 11........ .....控制單元 111........ ......反相器 12a、12b..... .....功率開關 13a、13b..... .....電感 131 、 132 ..... .....驅動訊號 14........ .....變壓單元 14 卜 142..... .....電力輸入端 143........ ......電力輸出端 15........ .....負載 151Pa «〇] 95ί 10, I H2a, 12b turn-on square wave waveform is a sine wave waveform. It can be clearly seen from the figure that since the driving signal 13 132 is opposite, when the input transforming unit 14 positive power input terminal 141 When the driving signal 131 is a positive half-cycle power signal, the driving signal 132 of the negative power input end of the transformer unit 14 is a negative half-cycle power signal, and vice versa. Therefore, based on a driving signal 131 thereof, a phase sine wave is used. The signal, the other driving signal 132 is an inverted sine wave signal, so that the voltage swing unit 14 can generate a push-pull voltage drive, so that the transformer unit is driven by the dual input voltage to generate the maximum power output driven by the power output terminal 143. Load π. Referring to the "Fig. 3", a schematic diagram of a driving circuit according to a second embodiment of the present invention is shown as follows: based on the design of various control units 11, if the control unit U outputs two sets of the same Lu frequency and the same phase The driving signal is provided between the power-power switch 12b and the control unit η, and the waveform inverter ill is used. When the control unit η outputs the same positive-phase driving signal, the waveform inverter 111 uses the waveform inverter 111 to The phase driving signal is converted into an inversion driving signal, so that the driving signal 13 132 of the input transformer unit is opposite in phase, so that the same effect of the first embodiment can be achieved. The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention. That is, the equivalent change disk which is the content of the patent application scope of the present invention should be the technical scope of the present invention. 1277280 repair (more) positive replacement page [schematic description of the drawings] FIG. 1 is a schematic diagram of a conventional variable voltage inverter driving circuit. FIG. 2 is a schematic diagram of a driving circuit according to a first embodiment of the present invention. Schematic diagram of the driving circuit of the second embodiment [Description of main component symbols] 10........ ..... Power supply unit 11.............. Control unit 111... ..... ...... Inverter 12a, 12b..... Power switch 13a, 13b....... Inductance 131, 132 .... ... drive signal 14........ ..... transformer unit 14 142....... power input 143........ ... power output terminal 15........ ..... load 151
回授共振頻率訊號Feedback resonant frequency signal