To supply high-quality power to electric cars, it is required to technically study power conversion at substations, power supply to feeding circuits, current collection using contact lines and pantographs, measurement and maintenance. The power supply technology development division consists of three groups called the power supply systems group, the current collection maintenance group and the contact line structure group.
Recently, the advancement of microelectronics and power electronics led to the remarkable development of control, measurement and power converter in the field of electric railway.
This paper describes several results of the development.