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Current Loop Bandwidth Extension for AC Servo System Based on GaN-HEMT and FPGA
Zekai Lyu,Ming Yang,Jiang Lon g,Shuyu Shang,Dianguo Xu 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In order to increase the productivity of the manufacturing process, a servo system with high bandwidth current loop should be realized. Switching frequency and digital delay are the main factors affecting the bandwidth of current controller. This paper focuses on the design of Gallium Nitride (GaN) semiconductors based AC servo drive system, one of its aims is to increase switching frequency. The field-programmable gate array (FPGA) is used, multiple stator current sampling and multiple PWM duty cycle update (MSMU) in a carrier period is proposed to reduce digital delay. Experiments on 100 kHz switching frequency show that the current control loop bandwidth can be extended to 6 kHz.
Design and Research of GaN-Based Motor Drive System with LC Output Filter
Zekai Lyu,Ming Yang,Donglin Xu,Shuyu Shang,Dianguo Xu 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper presents a gallium nitride (GaN) – based servo motor drive system. Compared to actual inverters based on insulated gate bipolar transistors (IGBTs), the proposed design extends the pulse width modulation (PWM) frequency to 100 kHz. This allows motor filters with small component sizes. Based on this, an LC filter is added to the motor drive system, and an undamped resonance suppression algorithm is proposed to suppress the resonance introduced by the filter. By adding a proper time delay, system can be stable without any additional sensors or power losses. As a result, ideal sinusoidal line-line voltage at the motor terminals, high motor efficiency and low switching noise are achieved.