Zhejiang Holip Electronic Technology Co., Ltd.

Xiaoran Xu

Liang Xiao

A circuit with a Safe-Torque-Off (STO) functionality and a frequency converter including the same are provided. According to embodiments, the circuit may include a first STO channel configured to control on/off of power supply to a high-side driver of a frequency converter based on a first STO signal, a second STO channel configured to control on/off of power supply to a low-side driver of the frequency converter based on a second STO signal, and a third STO channel configured to control supply of a drive control signal from a controller of the frequency converter to the high-side driver and the low-side driver based on a result of a logical operation of the first STO signal and the second STO signal, wherein the logical operation is configured to make the result active in response to at least one of the first and second STO signals being active.

Safe-Torque-Off (STO) circuit and frequency converter including the same

An optocoupler based control circuit and a method thereof are disclosed. The control circuit comprises a first control branch, which includes a first control signal input terminal configured to receive a first OFF function control signal; a first optocoupler, wherein a primary side of the first optocoupler is coupled to the first control signal input terminal, and an output of a secondary side of the first optocoupler is configured to control a first power supplied to a motor driving circuit; a first primary side on/off control circuit connected to the primary side of the first optocoupler, and configured to periodically turn on and off the coupling of the primary side to the first control signal input terminal; and a first secondary side filter circuit connected to the secondary side of the first optocoupler, and configured to filter the output of the secondary side, and configured as a low pass filter having a cutoff frequency lower than an on/off frequency of the primary side. The control circuit further comprises a diagnostic circuit configured to diagnose an operating state of the control circuit based on the output of the secondary side of the first optocoupler and the first power. The control circuit may be a Safe Torque Off (STO) circuit.

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Beijing, China

Xiaoran Xu