6ES7241-1AH32-0XB0通讯模块
按变换频率的方法分类
变频器按频率变换的方法分为交-交型变频器和交-直交型变频器。交-交型变频器可将工频交流电直接转换成频率、电压均可以控制的交流,故称直接式变频器。交直-交型变频器则是先把工频交流电通过整流装置转变成直流电,然后再把直流电变换成频率、电压均可以调节的交流电,故又称为间接型变频器。
6ES7241-1AH32-0XB0通讯模块
开关电路的原理是什么?
答:开关电路的原理是由开关管和PWM(Pulse Width Modulation)控制芯片构成振荡电路,产生高频脉冲。将高压整流滤波电路产生的高压直流电变成高频脉冲直流电,送到主变压器降压,变成低频脉冲直流电。
6ES7241-1AH32-0XB0通讯模块
Classic Bureau Graphique 3D Matrox G200 AGP Pour Win Windows 7 XP Vista Linux
Classic Office Gráfica 3D Matrox G200 AGP Para Win Windows 7 XP Vista Linux
CLASSIC OFFICE GRAFIKKARTE 3D MATROX G200 AGP FOR WIN WINDOWS 7 XP VISTA LINUX
Classic Office Graphic Card 3D Matrox G200 AGP For Win Windows 7 XP Vista Linux
Classic Office Scheda 3D Matrox G200 AGP Per Win Windows 7 XP Vista Linux
Compaq 137897 Qvision 2000+ Matrox Mga Is-Athena R2 PCI Graphic Card 004111
Compaq 的 Matrox 3p-v2 qvision 2000+ 2mb PCI VGA 显卡 1995
Doppio Matrox G55MDDAP32DB G550 32MB PCI Con Matrox LFH-60 a Doppio DVI Splitter
Double Matrox G55MDDAP32DB G550 32MB PCI Avec LFH-60 Pour Dual DVI Séparateur
Dual Matrox G55MDDAP32DB G550 32MB PCI Con Matrox LFH-60 a Doble DVI Divisor
DUAL MATROX G55MDDAP32DB G550 32MB PCI WITH MATROX LFH-60 TO DUAL DVI SPLITTER
Duale Matrox G55MDDAP32DB G550 32MB PCI Mit Matrox LFH-60 auf Dual DVI Splitter
G2+/MILP/8D/CPQ MATROX G200 PCI VGA CARD
Genuine 32MB Matrox 7012-03 Rev:A G55+MDHA32DB DVI VGA AGP Graphics Card
Genuino 32MB Matrox 7012-03 Rev: A G55+ MDHA32DB DVI VGA AGP Graphics Tarjeta
Good Silent Dual Head 3D Graphic Card For 2 Displays Matrox G45 +32MB RAM - G20
Good Silent Dual Head 3D Graphic Card For 2 Displays Matrox G45+32MBRAM - G20 MM
Grafikkarte AGP Matrox MGA-G200A-D2 PN.: S26361-D1114-V80
Grafikkarte AGP Matrox MGA-G200A-D2 PN.: S261-D1114-V80