脈衝屏蔽法是一種比較新穎的感應加熱電源調功方法
，也是近年來我國工業係統應用過程中比較常見的方法之一。weilenenggougenghaodedachengfuzaitiaojiemude，gongchengshimentongchanghuicaiyongquanqiaohuobanqiaochufamaichongdefangshi

，kuaisuyouxiaodewanchengfuzaipipeitiaoshigongzuo。benwenjianghuizhongdianzhenduipingbinibianqidequanqiaochufamaichongfakaiguanmoshiheshejisilujinxingjianyaojieshao。

圖1 屏蔽逆變器的全橋觸發脈衝法的開關模式

 

上圖圖1主zhu要yao介jie紹shao了le電dian壓ya型xing諧xie振zhen逆ni變bian器qi工gong作zuo在zai屏ping蔽bi逆ni交jiao器qi的de全quan橋qiao觸chu發fa脈mai衝chong法fa下xia的de工gong作zuo狀zhuang態tai
，我wo們men可ke以yi看kan到dao這zhe種zhong電dian路lu係xi統tong的de設she計ji比bi較jiao簡jian單dan。在zai正zheng常chang開kai通tong的de狀zhuang態tai下xia，S1、S3和S2、S4按照正常順序輪流導通如圖1中（a）、（b）所示，輸出的電壓波形為方波

，電流為正弦波。

 

在zai了le解jie了le全quan橋qiao觸chu發fa脈mai衝chong法fa的de開kai關guan運yun行xing模mo式shi後hou，我wo們men再zai來lai看kan一yi下xia這zhe種zhong設she計ji是shi如ru何he過guo濾lv脈mai衝chong屏ping蔽bi信xin號hao的de。在zai正zheng常chang工gong作zuo狀zhuang態tai下xia
，當dang脈mai衝chong屏ping蔽bi信xin號hao到dao來lai時shi
，逆ni變bian器qi進jin入ru到dao屏ping蔽bi逆ni變bian器qi的de全quan橋qiao觸chu發fa脈mai衝chong法fa的de工gong作zuo狀zhuang態tai下xia工gong作zuo，逆ni變bian器qi的de所suo有you脈mai衝chong被bei屏ping蔽bi掉diao，其qi工gong作zuo模mo式shi如ru圖tu1中（c）、（d）。

圖2 直流側電流波形圖

圖3 逆變器輸出波形圖

 

yishangwomenfenxilequanqiaochufamaichongfadeyunxingqingkuanghegongzuozhuangtai，namezaishiyonglezhezhongjishujinxingganyingjiaredianyuandefuzaitiaojiehou
，dianliuboxingtudeqingkuangyoushizenmeyangne？youyuzhezhongwanquanpingbimaichongfangfacaoluzhongxiezhendianliushikaotongguofanbinglianerjiguanliutongxiangzhiliucefankuinengliang，zaijinxingfuzaitiaojieguochengzhong，qizhiliucedianliurutu2所示。諧振逆變器輸出端的電壓為直流電壓
，逆變器的輸出電壓、電流波形如圖3所示。從圖3中zhong我wo們men可ke以yi看kan到dao，逆ni變bian器qi的de脈mai衝chong已yi經jing完wan全quan被bei屏ping蔽bi掉diao，沒mei有you大da的de峰feng值zhi毛mao刺ci出chu現xian，由you此ci可ke見jian這zhe種zhong方fang法fa能neng夠gou快kuai速su有you效xiao的de完wan成cheng加jia熱re電dian源yuan的de負fu載zai調tiao節jie。