A novel high-voltage isolation power supply for multiple devices driving

A new kind of power supply with multiple isolated outputs used for driving of thyristors in short circuit fault current limiter is developed. The chief parts of the power supply include a DC current source, a bridge-type inverter and a series of output transformers. Turns number of the primary winding of all the output transformers is one. The isolation voltage between every two outputs can be made very high if ultra-high voltage cable is adopted to make the primary winding of all the output transformers. The number and locations of outputs of the power supply can be changed very easily to meet the requirements of the thyristors in the limiter. With the increase of voltage level and number of power semiconductors in the electronic equipment, the proposed power supply will be more advantageous. Compared with a power supply made in the other way with the same capacity, same number of outputs and same isolation voltage, the power supply proposed in this paper has the advantage of smaller in size, lighter in weight, higher efficiency and reliability, lower cost and so on