| 摘要 |
PROBLEM TO BE SOLVED: To perform stable high-frequency operation. SOLUTION: Resonance means Lr and Cd, where a discharge tube is connected and a capacitor Cf for generating a voltage in synchronization with a current that flows to a resonance means are connected in series to the connection point S of first and second semiconductor switching elements being connected in series complementarily, and a capacitor voltage is applied to a control terminal G of the first and second semiconductor switching elements via a phase shift means Lg for shifting phase according to the frequency change in the resonance means. In this manner, stable high-frequency operation in synchronization with a resonance current is enabled also, when resonance conditions are changed. |
