摘要
测量IGBT逆变器的输出电流需要电流传感器。按输出功率的不同,目前已有一些熟知的测量方案。在逆变器的印刷电路板(PCB)上放置取样电阻,因系统成本低,电流测量精确而被广泛采用,但运行中取样电阻的功耗限制了这种方法的使用,因而对于较大的功率必须采用其他方法。现在有一种技术,即把电流取样电阻放置到IGBT模块的基板上,使其尽可能地靠近散热器,这种技术可以用于最高达35kW等级的电流测量,但实际上在更大功率的测量时仍采用目前应用的电流传感器法。
Current sensors are required to measure an electric current in an output phase of an IGBT inverter. Depending on the IGBT inverter output power,several solutions are well known today. Shunt resistors, placed on the printed circuit board (PCB) in an inverter design,are popular due to the low system cost and exact current measurement. Due to the losses in the current shunt resistors during operation this solution is limed. Therefore other solutions have to be used for higher power. With a technology that allows placement of current shunt resistors on the base plate in an IGBT module these shunt resistors are as close an possible to the heat sink. In the range up to 35kW shunt resistors may be used for current measurement. A different and in fact exciting solution is to use the advantage of current shunt measurement in a higher power range were current transducers are utilised today.
出处
《电力电子》
2004年第3期33-36,共4页
Power Electronics
