Why can't we use a DC DC converter as a DC transformer in HVDC transmission?
At present, the DC/DC converters that can be supplied can be used in the high-voltage DC bus system. The output power of the thick film hybrid integrated process product is not more than 120W, and the output power of the PCB surface mount technology product is not more than 1000W. However, in high-voltage input applications, it is limited by the withstand voltage capability of the Si power device inside the DC/DC converter. Considering the device selection and internal insulation design requirements, the maximum input voltage of the DC/DC converter does not exceed 400V, including Thick film hybrid integration process and PCB surface mount process DC/DC converter.