| 摘要 |
<p>PROBLEM TO BE SOLVED: To achieve both high-speed start-up and stabilization of output voltage.SOLUTION: A controller 300 employs switching control during a period until an output voltage Vhp of a step-up transformer 1 reaches a threshold Th, and employs supply voltage control while maintaining the state of a switching control signal when the output voltage Vhp has reached the threshold Th during a period after the output voltage Vhp has become the threshold Th or more. The switching control refers to a control method of adjusting the frequency or duty ratio of the switching control signal that drives a switch circuit 4 to adjust the output voltage Vhp. The supply voltage control refers to a control method of adjusting a supply voltage V1 applied to the primary side of the step-up transformer 1 to adjust the output voltage Vhp.</p> |
