| 摘要 |
PROBLEM TO BE SOLVED: To output a DC voltage even if an amplitude of an AC voltage is reduced, while reducing the size and cost of the device.SOLUTION: A power supply device for outputting a voltage formed by superimposing an AC voltage on a DC voltage includes: a transformer 203 for generating an AC voltage; a drive circuit 204 which is connected to a primary side of the transformer 203, to drive the primary side of the transformer 203 so that a secondary side may output a voltage of a predetermined value; a half-wave voltage doubler rectifier circuit 250 which is connected to one end of the secondary side of the transformer 203, and rectifies and smooths the AC voltage to output a positive-potential DC voltage; a detection resistor 231 which is connected to the other end of the secondary side of the transformer 203, to generate a DC voltage to be superimposed on the AC voltage; and a drive circuit 206 which is connected to the half-wave voltage doubler rectifier circuit 250 and the detection resistor 231, and controls a current value corresponding to the DC voltage output from the half-wave voltage doubler rectifier circuit 250, to control the DC voltage generated by the detection resistor 231. |
