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US 2020/0403552 A1Published application
Motor drive system and control method therefor
AssigneeDelta Electronics, Inc.
InventorsYi-Jan Chang, Yi-Kai Chou, Po-Sung Chiang, Chien-Hao Chen
Life of this patent
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Abstract
A motor drive system and a control method are provided. The motor drive system is electrically connected to a motor. The motor drive system includes two safe torque off (STO) modules to achieve a two-channel STO redundancy infrastructure, so as to improve the safety of the motor drive system. In addition, the motor drive system includes a diagnosis module to diagnose malfunction of the STO modules. It ensures the STO modules to meet the related safety requirements.
Claims15
A motor drive system for driving a motor, comprising:
- a control unit;
- a first safe torque off (STO) module comprising a first coupling module and electrically connected to the control unit for receiving a first control signal from the control unit, the first STO module converting the first control signal to a first driving signal;
- a second STO module comprising a second coupling module and electrically connected to the control unit for receiving a second control signal from the control unit, the second STO module converting the second control signal to a second driving signal;
- a first gate driving circuit electrically connected to the first STO module for receiving the first driving signal, the first gate driving circuit driving a high-voltage side switch, the high-voltage side switch electrically connected to the motor;
- a second gate driving circuit electrically connected to the second STO module for receiving the second driving signal, the second gate driving circuit driving a low-voltage side switch, the low-voltage side switch electrically connected to the motor;
- and
- a diagnosis module comprising a microcontroller and electrically connected to the first STO module and the second STO module for capturing the first driving signal and the second driving signal respectively, the diagnosis module comparing the first driving signal and the second driving signal to output a compared result;
- wherein the microcontroller determines whether at least one of the first STO module and the second STO module is malfunctioned according to the compared result.
5 more elements
A control method for a motor drive system, comprising:
- outputting, by a control unit, a first control signal and a second control signal to a first safe torque off (STO) module and a second STO module respectively;
- outputting, by the first STO module, a first driving signal according to the first control signal;
- outputting, by the second STO module, a second driving signal according to the second control signal;
- comparing, by a diagnosis module, the first driving signal and the second driving signal to output a compared result to a microcontroller;
- determining, by the microcontroller, that the first STO module and the second STO module are operated normally according to the compared result in which the first driving signal and the second driving signal are identical when the first control signal and the second control signal are at the same voltage level;
- and
- determining, by the microcontroller, malfunction of at least one of the first STO module and the second STO module according to the compared result in which the first driving signal and the second driving signal are distinct when the first control signal and the second control signal are at the same voltage level.
4 more elements
Dependencies are inferred from the claim text.