| This dissertation details the design of a DC speed control with high ratio power and power density, which will be applied to a type of electric power underwater vehicle. Considering high power, high power density, small volume and weight, tough electromagnetic environments, the most optimal scheme is chosen to gain good system performance after comparing with the others on various aspects. Based on the 80C196MD Micro-Controller and PSD813F1, which can be programmed on the target board, the time partition PWM circuit and controlling subsystem construction are adopted.This dissertation analyzes the working principles of the system and the ways to achieve good adjusting performance. Especially, some key technical issues of the application based on the IGBT apparatus, which include drive circuit, snubber circuit, protection and controlling the quantity of heat, and so on, are carefully discussed. To reduce the volume of the equipment and enhancing the EMC effectively, some elements such as electrical barrier between the power circuit and electronic circuit, algorithm of the controller, the parameters of circuits, the software and hardware of the control subsystem, etc. are carefully considered and accomplished.Based on the research mentioned above, the 240KVA time partition PWM DC speed-adjusting device is designed and a pattern was made. Then, a lot of experiments are performed to verify the performance. The results reveal that the pattern totally achieves the expected outcome. |
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