| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 106 === This thesis is about a power supply system applied in deep sea exploration ship, including a 350V/300V DC/DC converter, a 350V/24V DC/DC converter and a driver system of 4-polar conductivity meter. The DC/DC converter is structured by Full-Bridge LLC circuit with two paralleled module to increase the output power up to 2 kW. The digital controller captures the voltage, current feedback and calculates the variations. In order to stabilize the output voltage, the frequency modulation technique is used to reach the required level, and duty control is employed to balance the output current of two power module. Also, the thesis uses the resonant inductor, resonant capacitor and parasitic components in transformer to form a resonant tank. It can achieve the zero-voltage switching to decrease the power loss of switching under desired load conditions. Finally, the testing result shows that the efficiency of the whole system is above 80 %, and the maximum is up to 95.7 %.
Moreover, a 24V/1.2V DC/DC converter is implemented to drive the four-polar conductivity meter. We can sense the current of the current electrode, and the voltage of the voltage electrode and convert these signals to digital codes by ADC. After that, these converted information will be delivered throughout SCI (serial communication interface) and be sent to the ship for reading and storing the conductivity of seawater.
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