描述
L1和C1可消除信号中的尖峰波并抑制干扰。经L1、C1滤波后的信号接入到整流桥,再将从整流桥中输出的高压直流信号经过C2进行滤波后,即可得到电压Vi。在图2中,T1为高频变压器,它能够快速存储和释放能量,经高频整流滤波后即可获得直流连续输出。高频变压器T1的1脚和3脚为输入初始绕组,4、5两脚为反馈绕组,次级绕组分别为6,9脚和7,10脚(其中1,4,6,7为各绕组的同名端)。并且6,9绕组是主绕组,用它经进一步变换产生的+5V直流稳压电源可作为主电压源,即数字电压源(Vo1);7,10绕组为辅绕组,用它经电容C8~C11滤波和78L05稳压产生的+5V直流稳压电源为辅电压源,即模拟电压源(Vo2)。鉴于在TOP221Y内的功率MOSFET关断瞬间,高频变压器的漏感会产生尖峰电压,另外,在1,3初始绕组上还会产生感应电压(即反向电动势),而且二者又会叠加在Vi上,使电压严重增大,因而要求功率MOSFET能够承受高压。同时,还必须在漏极增加钳位电路,以吸收尖峰电压,保护TOP221Y内的功率MOSFET不受损害。本设计利用R1,C3,ZD1,D1组成钳位电路。当MOSFET导通时,T1的初始绕组的电压极性为(3端)为正,1端为负,此时D1截止,钳位电路不起作用;而在MOSFET截止的瞬间,初始绕组变为1端为正,3端为负,此时D2导通,尖峰电压就被R1和C3吸收掉。
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主营:世界知名品牌的PLC、DCS系统备件模块
①Allen-Bradley(美国AB)系列产品》
②Schneider(施耐德电气)系列产品》
③General electric(通用电气)系列产品》
④Westinghouse(美国西屋)系列产品》
⑤SIEMENS(西门子系列产品)》
⑥销售ABB Robots.FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、PanasonicRobots、MOTOMAN Robots。
⑦estinghouse(西屋):OVATION系统、WDPF系统、MAX1000系统备件。
⑧Invensys Foxboro(福克斯波罗):I/A Series系统,FBM(现场输入/输出模块)
顺序控制、梯形逻辑控制、事故追忆处理、数模转换、输入/输出信号处理、数
据通信及处理等。Invensys Triconex:冗余容错控制系统、基于三重模件冗余(TMR)
结构的zui现代化的容错控制器。
⑨Siemens(西门子):Siemens MOORE,Siemens Simatic C1,Siemens数控系统等。
⑩Bosch Rexroth(博世力士乐):Indramat,I/O模块,PLC控制器,驱动模块等。
◆Motorola(摩托罗拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
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V-Tex Vacuum Rollcam Slit Valve 200803-25-0013-02 new
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Varian Turbo-V 1800 Controller 9699461S002 E23000028
Leybold Varian Turbopump Controller NT 1000 112087001
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Thermo Electron DEI Water to Water Cooler Chiller
Microbar Trackmate Chemical Cabinet
Nikon Optistation 3 X Y Stage With Encoders
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ASML A5401A/B Preamp PCB Assembly 859030003