Use special motor to drive the rolling center shaft to rotate, to achieve the shutter switch, when the motor is set to the upper and lower limits automatically stop.
用专用电机带动卷帘中心轴转动，达到卷帘开关，当转动到电机设定的上下限位时自动停止。
Two switch measures ports (upper and lower limits), used in limited alarm or the ration controlling.
路开关量输出接口，用于限量报警或定量控制。
The technology of soft-switch has been one of the most active directions in the power electronics field. It overcomes the limits of hard-switch working.
软开关技术是电力电子学领域最活跃的研究方向之一，克服了硬开关工作方式中存在的缺陷。
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