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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.
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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.
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지주오,이즈민,왕수유,위안런,거타오,위안샹,추이창위안,거홍안,평정,슈롱치,홍성태,최민호,조승열,최동일,홍광선,임한종,이순형,Ji, Zhuo,Li, Zhimin,Wang, Shuyu,Yuan, Ren,Ge, Tao,Yuan, Shang,Cui, Changyuan,Ge, Hongan,Feng, Zheng,Xu, Longqi,Hong, Sung-Tae,Choi, 한국건강관리협회 2005 한국건강관리협회지 Vol.3 No.1
The present pilot project was executed to recommend a strategy of clonorchiasis control in China. The pilot area of this project was Zhaoyuan, Hailin, and Ningan, Heiloagjiang province. A baseline survey subjecting 4,865 residents in Heilongjiang confirmed Zhaoyuan asa high endemic area and Hailin and Ningan as moderate endemic areas. Six different control strategies were implemented in Zhaoyuan, two were in Hailin, and one was in Ningan. Including the baseline survey and project programs from 2000 to 2004, total 63,274subject-times were examined of their feces for Clonorchiseggs, 26,680 were treated, 10,082 were screened by ELISA, and 6,130 subjects were examined of their liver by sonography. The egg Positive rates in 6 villages of Zhaoyuan were as high as 44.8% 70,0%. Following the protocolof each strategy, the subjected residents were examined of their feces and treated with 25 mg/kg praziquantel, 3 times. Except the control group, all of the villages showed 72.8% to 92.0% reduction of their original egg Positive rates at Zhaoyuan. Mass treatments of all subjected residents in 2001 and 2003 reduced the egg rate from 68.8% to18.7% and 4 annual mass treatments reduced the rate from 44.8% in 2001 to 8.7% in 2004.Selective annual treatments of egg positive subjects reduced the egg rates from 50.8% in2001 to 13.8% in 2004 or from 70.0% in 2001 to 11.6% in 2004, and two treatments in a year reduced the rate from 57.6% in 2001 to 4.6% in 2004. According to repeated treatments, EPG counts decreased remarkably. In moderate endemic areas, the original egg rates were 22.6% and 28.3% in 2001 but were 1.7% and 1.1% after 2 or 3 selective treatments. The present findings of the chemotherapeutic control of clonorchiasis prove that repeated medication is important. The reduction is directly correlated with dose of praziquantel but not with mass or selective treatments. Chemotherapeutic control of reservoirhosts has little effect on reinfection of clonorchiasis because the field along the Songhua-jiang is too wide to be impacted. ELISA confirmed many serologically positive cases to Clonorchisantigen but only a few cases were positive to other antigens (Paragonimus, cysticercus, sparganum). The abdominal soaography visualized intrahepatic bile duct dilatation and periductal echo in 2,002 of 6,070 examined subjects. In addition to these examinations and treatment, health education supplemented tㅗe control activities. The present findings prove clonorchiasis is very widely prevalent and heavily endemic along the rivers in Heiloagjiang. The results suggest that group chemotherapy with praziquantel is effective to reduce endemicity of clonorchiasis. Mass treatment without individual fecal examination is recommended in heavy endemic areas where the egg rate is over 40% while one selective treatment is effective enough in moderate endemic areas.
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