Open-phase protection device of frequency converter and frequency converter

The utility model discloses an open-phase protection device of a frequency converter and the frequency converter, and the device comprises a soft start unit which provides a trigger signal; the trigger signal is used for triggering the signal of the driving module; the open-phase detection unit is used for detecting whether the three-phase alternating-current power supply is open-phase or not to obtain an open-phase fault output signal; according to the open-phase fault output signal and the trigger signal, a driving signal of a driving module is determined; the three-phase alternating-current power supply is a power supply input to the rectifying unit; and the driving module controls the work of the thyristor module according to the driving signal. According to the scheme, three-phase power grid open-phase detection is carried out by adopting a hardware circuit, and the detection accuracy can be improved. 本实用新型公开了一种变频器的缺相保护装置和变频器，该装置包括：软启动单元，提供触发信号；触发信号，是用于触发驱动模块的信号；缺相检测单元，检测三相交流电源是否缺相，得到缺相故障输出信号；以及，根据缺相故障输出