High-voltage power supply device

A high-voltage power supply device comprising:

• a voltage generation unit having a first voltage generation unit configured to output a DC high-voltage of positive polarity and a second voltage generation unit configured to output a DC high-voltage of negative polarity;
• a switching unit using a semiconductor switching element, the switching unit including a first switching unit configured to output the DC high-voltage of positive polarity to a voltage output terminal when the first switching unit is in a conduction state and a second switching unit configured to output the DC high-voltage of negative polarity to the voltage output terminal when the second switching unit is in a conduction state;
• a driver configured to drive a control terminal of the semiconductor switching element in the switching unit;
• and
• a controller configured to control conduction/non-conduction of the first switching unit and the second switching unit via the driver,
• wherein the driver includes:
• a high-frequency transformer provided with a primary winding and a secondary winding, a distribution of a stray capacitance per number of unit turns of the primary winding between the primary winding and the secondary winding in an extension direction of the primary winding being symmetrical to a midpoint of the primary winding;
• a rectifier configured to rectify an AC current induced in the secondary winding of the high-frequency transformer;
• and
• a balanced output type high-frequency excitation unit configured to excite the primary winding of the high-frequency transformer differentially.