Research of Voltage-Balancing Methods of Series-Connected IGBTs
Lv Miao,
Mei Guifang,
Xu Guancheng,
Dong Xiaoshuai
Issue:
Volume 4, Issue 5, October 2016
Pages:
73-79
Received:
18 October 2016
Published:
19 October 2016
Abstract: Voltage-balancing method is the key to the application of series-connected Insulated-Gate Bipolar Transistor(IGBT). In this paper the voltage-balancing process is divided into 4 stages: dynamic turning-on process, dynamic turning-off process, the tail current state and steady state, whose voltage-balancing methods are then proposed respectively: gate compensation capacitor network for dynamic process; resistance capacitance(RC) voltage-balancing circuit designed for tail current state with the capacitance given by a formula; and parallel-connected voltage-balancing resistance for the steady state. Based on the work above, power module of two series-connected IGBTs is designed and tested under high voltage and high current condition. The result shows that under the series total voltage 2kV (1.85kV maximum peak voltage for each IGBT) and 2kA current, the power module balanced the voltage of the whole period of an turning on and off process, and both of the voltage-unbalance-rate of dynamic and steady state are less than 5%.
Abstract: Voltage-balancing method is the key to the application of series-connected Insulated-Gate Bipolar Transistor(IGBT). In this paper the voltage-balancing process is divided into 4 stages: dynamic turning-on process, dynamic turning-off process, the tail current state and steady state, whose voltage-balancing methods are then proposed respectively: ga...
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The Research on the Application of AGV System in Logistics Sorting Operation
Yuan Ruiping,
Dong Tingting,
Li Juntao
Issue:
Volume 4, Issue 5, October 2016
Pages:
80-83
Received:
11 October 2016
Accepted:
18 October 2016
Published:
7 November 2016
Abstract: With the rapid development of express industry, traditional sorting operation mode has been unable to meet customers’ requirements for speed. As modern automatic logistics equipment, Automated Guided Vehicle (AGV) has many advantages. It can not only reduce the number of operators and greatly improve the working productivity, but also has the characters of flexibility and reliability. In this paper, an AGV system used in express sorting operation is built. Then its business process, system architecture and task schedule algorithm are specified. Finally, AGV sorting system is developed using C# and simulation experiments are carried out. The efficiency and error rate of AGV sorting system is compared with traditional sorting methods. Simulation results show that it can be more effective and stable to use the AGV system in logistics sorting operation.
Abstract: With the rapid development of express industry, traditional sorting operation mode has been unable to meet customers’ requirements for speed. As modern automatic logistics equipment, Automated Guided Vehicle (AGV) has many advantages. It can not only reduce the number of operators and greatly improve the working productivity, but also has the chara...
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