500) {this.resized=true; this.width=500; this.alt='这是一张缩略图，点击可放大。\n按住CTRL，滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/55/594321184731560.bmp');}" onmousewheel="return imgzoom(this);">炸管,求助!
昨天做逆变主电路(如图)实验(管子的驱动是有限双极型的).H桥的超前臂两个IGBT管子在合闸的瞬间点炮了(起初的电压我只给到了100V),同时IGBT1的栅极驱动电阻R1也被烧了.仔细查了后,发现桥接时有个螺丝没拧紧(A点).但分析了一下,好像不是这个原因,因为管子的耐压值是1200V的.搞不懂为什么了?请教高人指点!谢谢
500) {this.resized=true; this.width=500; this.alt='这是一张缩略图，点击可放大。\n按住CTRL，滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/55/594321184731560.bmp');}" onmousewheel="return imgzoom(this);">
500) {this.resized=true; this.width=500; this.alt='这是一张缩略图，点击可放大。\n按住CTRL，滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/55/594321184731560.bmp');}" onmousewheel="return imgzoom(this);">