6ES7241-1AH32-0XB0通訊模塊
按變換頻率的方法分類
變頻器按頻率變換的方法分為交-交型變頻器和交-直交型變頻器。交-交型變頻器可將工頻交流電直接轉換成頻率、電壓均可以控制的交流,故稱直接式變頻器。交直-交型變頻器則是先把工頻交流電通過整流裝置轉變成直流電,然後再把直流電變換成頻率、電壓均可以調節的交流電,故又稱為間接型變頻器。
6ES7241-1AH32-0XB0通訊模塊
開關電路的原理是什麼?
答:開關電路的原理是由開關管和PWM(Pulse Width Modulation)控制芯片構成振蕩電路,產生高頻脈衝。將高壓整流濾波電路產生的高壓直流電變成高頻脈衝直流電,送到主變壓器降壓,變成低頻脈衝直流電。
6ES7241-1AH32-0XB0通訊模塊
Classic Bureau Graphique 3D Matrox G200 AGP Pour Win Windows 7 XP Vista Linux
Classic Office Gr fica 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
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DUAL MATROX G55MDDAP32DB G550 32MB PCI WITH MATROX LFH-60 TO DUAL DVI SPLITTER
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Grafikkarte AGP Matrox MGA-G200A-D2 PN.: S261-D1114-V80