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公开(公告)号：EP4270768A1
公开(公告)日：2023-11-01
申请号：EP21934647.5
申请日：2021-12-08
发明人： ZHANG, Zhengrui , WANG, Sang , ZHAO, Xudong
IPC分类号： H02P6/15
摘要： The present invention relates to a circuit structure for implementing lead/lag commutation of an electric motor. The circuit structure comprises: a Hall angle mapping module for receiving three Hall signals generated by a Hall module of an external electric motor and respectively configuring the Hall signals and converting same into Hall synchronization angle values; a Hall angle update module for selecting a corresponding angle update mode according to the internal logic of the circuit structure; a three-phase angle generation module for performing time-sharing computation on angles generated by the Hall angle update module, so as to generate current three-phase angle signals; an angle conversion module for performing corresponding angle conversion on the three-phase angle signals generated by the three-phase angle generation module; and a PWM generation module for generating three-phase six-way complementary PWM waveforms. By means of the circuit structure of the present invention, only some additional logic circuit modules are added, such that a phase lead/lag operation can be easily implemented, and smooth switching can be realized between a square wave control mode and a sine wave control mode.
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2.发明公开
公开(公告)号：EP4395155A1
公开(公告)日：2024-07-03
申请号：EP22885244.8
申请日：2022-07-29
发明人： WANG, Sang , ZHAO, Xudong , ZHANG, Zhengrui
IPC分类号： H02P6/08
摘要： Provided in the present invention are a method for adaptively changing the duty ratio of PWM, and a circuit and an electric motor driving system. The method comprises: performing sampling and low-pass filtering on a direct-current bus voltage; determining whether the direct-current bus voltage is undervoltage, and if so, entering an undervoltage protection state, otherwise, executing the next step; calculating a new duty ratio and a new amplitude value corresponding to the new duty ratio; and determining whether the new duty ratio is greater than 100%, and if so, performing field-weakening control, otherwise, adjusting the duty ratio of a PWM signal on the basis of the new amplitude value. By means of the method for adaptively changing the duty ratio of PWM, the circuit and the electric motor driving system in the present invention, the duty ratio of a PWM signal is adaptively adjusted on the basis of an existing sine-wave generator and PWM generator while the current loop, speed loop or torque loop of the main body of the electric motor driving system is not changed, such that the influence of the fluctuation in a direct-current bus voltage on the electric motor performance can be overcome without needing to improve the CPU performance; and the operation is simple, and the cost is greatly reduced.
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3.发明公开
公开(公告)号：EP4181386A1
公开(公告)日：2023-05-17
申请号：EP21912986.3
申请日：2021-07-02
发明人： WANG, Sang , ZHAO, Xudong , ZHANG, Zhengrui
摘要： A method for implementing brushless direct current motor Hall position sensor fault processing, comprising: detecting a Hall signal by using an edge detection means, and recording the number of edge jumps; determining whether the absolute value of the difference between a position change of a rotor represented by a Hall and an angle value calculated inside of an MCU is within a preset error range, if so, then updating the angle value inside of the MCU as an angle represented by a rotor position as detected by the Hall, otherwise, incrementing the angle value inside of the MCU according to an angle increment calculated from the rotational speed of a motor; and obtaining an acceptable range according to a last raw angle increment value. A method for implementing brushless direct current motor Hall position sensor fault processing is employed, and an internal degree recording angle is designed. Compared with a means of using a timer alone, in which the size of the count is different when the speed is fast and slow and the position of a motor rotor cannot be intuitively understood, the motor is commutated according to a degree angle value, and the current position of the motor may thus be clearly understood.
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