第30卷第9期煤炭技術(shù)Vol.30.No.092011年9期”_Coal TechnologySeptember 2011PWM技術(shù)優(yōu)化的實(shí)現(xiàn)與應(yīng)用李開彥，賀攀，干磊(黃石供電公司，湖北黃石435000摘要:PWM 技術(shù)在電力電子系統(tǒng)中應(yīng)用廣泛,并且具有重要地位。但是pWM技術(shù)在應(yīng)用中也存在許多不足之處。例如在逆變電路中,SPW M技術(shù)的直流電壓利用率較低,含有較大的諧波分量,電磁干擾( EMI)嚴(yán)重,開關(guān)損耗較大。優(yōu)化PWM技術(shù)關(guān)鍵在于通過對常規(guī)PWM技術(shù)的改進(jìn),在確保實(shí)現(xiàn)電力電子系統(tǒng)基本功能的同時,盡可能減小PWM技術(shù)在應(yīng)用中的不足。文章分析了幾種優(yōu)化PWM技術(shù)的原理,并且介紹了其模型。關(guān)鍵詞:PWM控制技術(shù);電力電子;準(zhǔn)正弦;隨機(jī)開關(guān);開關(guān)損耗中圖分類號:TD464文獻(xiàn)標(biāo)識碼:A文章編號:1008- -8725( 2011 )09 -0066 -04Optimization and Application of PWM TechnologyLI Kai-yan, HE Pan, GAN Lei( Huangshi Eleotric Power Supply Company, Huangshi 435000, China)Abstract:The PWM technology is widely applied in the electric power electron system， whichenjoys an important status in the electric power electronic technology. However, the PWMtechnology also has many insufficiencies in the application. For example, in the contravariantelectric circuit, the usage ratio of the SPWM technology DC voltage is low, while the harmoniccontent is rich, causing serious electromagnetic interference as well as large switching loss. Thekey to optimize the PWM technology lies in the improvement of the conventional PWMtechnology, and at the same time guarantee the realization of basic functions of the electricpower electron system and reduce the insufficiency of the PWM technology as far as possible inthe application. In the paper, several techniques of the optimization of PWM are analyzed, itsmodel is introduced.Key words:PWM control technology; electric power electron; accurate sine; stochastic switch;switching loss子裝置系統(tǒng)已廣泛應(yīng)用于生產(chǎn)中,其中PWM控制0引言技術(shù)是電力電子技術(shù)中的重要技術(shù)之一。PWM驅(qū)近年來,隨著電力電子技術(shù)的快速發(fā)展,電力電動信號所造成的電磁干擾(EMI)是無法依靠增加硬當(dāng)進(jìn)人勻速階段( RUN)后,步進(jìn)電機(jī)將保持勻制算法 ,分析了實(shí)現(xiàn)加減速自動控制的關(guān)鍵問題,提速運(yùn)行,同時進(jìn)行減速點(diǎn)位置的判斷。如果達(dá)到減速出了-種對減速點(diǎn)自動判斷的算法;采用SEP4020點(diǎn)位置,則切換到減速階段( DECEL)運(yùn)行。處理器PWM模塊實(shí)現(xiàn)了速度控制的軟件方案設(shè)計當(dāng)進(jìn)人減速階段(DECEL)后,步進(jìn)電機(jī)減速運(yùn)與實(shí)現(xiàn)。行。減速階段減速頻率表中的計數(shù)值,通過不斷改變參考文獻(xiàn):PWM周期寄存器的計數(shù)值來實(shí)現(xiàn)降速控制。減速步山劉偉基于SEP4020的嵌面菱體磨削控制系統(tǒng)的設(shè)計與數(shù)運(yùn)行完畢后,中斷禁止.停止脈沖發(fā)送,從而停止研究0事天:重慶大學(xué)，20102] 浦艷敏,關(guān)于數(shù)控系統(tǒng)加減速控制的研究]科學(xué)技術(shù)與工程,步進(jìn)電機(jī)運(yùn)行。2009(22):6782- 6785. .3] Ngoc Quy Le, Jung Uk Cho, Jae Wook Jon.Appieation of Ve-4結(jié)語locity Profile Generation and Closed-Loop Control in Step Mo-tor Control System [I] SICE -ICASE, Intemnational Joint Confer-經(jīng)過分析步進(jìn)電機(jī)構(gòu)成的開環(huán)控制系統(tǒng)存在的ence, 2006:3593- 3598.問題，提出了實(shí)現(xiàn)加減速控制的必要性;在對直線[4 劉敏數(shù)控機(jī)床伺服系統(tǒng)加減速控制的指數(shù)算法及其分析J.機(jī)型指數(shù)型和S型3種加減速曲線數(shù)學(xué)模型研究后，s嫩計話與封制2012171線5] 張華寧,王孚懋.徐方全S型曲線加減速算法的研究[J]現(xiàn)代制造結(jié)合系統(tǒng)特點(diǎn)，選擇直線型加減速算法,該算法簡技術(shù)與裝備206,071(2):21-22單、易實(shí)現(xiàn),機(jī)床響應(yīng)快,效率高;針對直線加減速控中國煤化工鳳英)收稿日期2011-03-20，修訂日期2011-05-18MYHCNMH G作者簡介:李開彥( 1983- -),男,湖北黃岡人,電氣工程師研究方向:電力系統(tǒng)分析與控制。