| 摘要 |
PROBLEM TO BE SOLVED: To form a sufficiently low-value output voltage from a high-voltage input voltage.SOLUTION: There is provided a power supply circuit including a first series regulator including a first semiconductor element and a first constant voltage source, and a second series regulator including a second semiconductor element and a second constant voltage source, wherein the first series regulator and the second series regulator are cascaded, and an input voltage to the first series regulator is a high voltage equal to or greater than 500 V. |
