22A-A1P5H204
通常,大功率电机、变频器等,末端都是由大功率管、IGBT等元件组成的H桥或3相桥。
每个桥的上半桥和下半桥是是不能同时导通的,但高速的PWM驱动信号在达到功率元件的控制极时,往往会由于各种各样的原因产生延迟的效果,造成某个半桥元件在应该关断时没有关断,造成功率元件烧毁。
死区就是在上半桥关断后,延迟一段时间再打开下半桥或在下半桥关断后,延迟一段时间再打开上半桥,从而避免功率元件烧毁。这段延迟时间就是死区。(就是上、下半桥的元件都是关断的)死区时间控制在通常的低端单片机所配备的PWM中是没有的。
死区时间是PWM输出时,为了使H桥或半H桥的上下管不会因为开关速度问题发生同时导通而设置的一个保护时段,所以在这个时间,上下管都不会有输出,当然会使波形输出中断,死区时间一般只占百分之几的周期。
但是PWM波本身占空比小时,空出的部分要比死区还大,所以死区会影响输出的纹波,但应该不是起到决定性作用的。
22A-A1P5H204
22A-A1P5H204
Honeywell Issc Ssec Rack 620-3691 6203691 USED
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NIB HONEYWELL 620-3691 RACK
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***NIB*** Honeywell I/O Control Module # 620-0058
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