| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 106 === This thesis develops a water purification system for capacitive deionization devices CDI with energy management. The proposed energy recovery and recharge functions not only can transfer the charge stored in the CDI by electrosorption to the supercapacitor through the proposed bidirectional energy management, but also recharge the charge stored in the supercapacitor to the CDI. First, the proposed digital controller smoothly achieves bidirectional energy transfer, by using a buck-boost converter with hysteresis control, according to the requirements of the energy transfer of the CDI. Moreover, combing the progressive duty cycle and dual-frequency control technigue renders the proposed system being able to improve the decreased transfer efficiency affected by the high equivalent resistance of the CDI, and to overcome the increased recovery time resulted from the uneven speed of the ion absorption Furthermore, the bidirectional control is used to recharge the recycled energy to the capacitive deionization device to achieve energy circulation and reduce energy consumption. Finally, a human-machine interface is constructed to observe statistical datas, such as the waveform, efficiency of energy bidirectional transmission, and dynamic changes of the system.
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