| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to discharge full the charged power from a capacitor and carry out discharge control safely without using a large power consumptive element, by providing a switching control means for controlling and switching a second driving control signal from a power supply control circuit, and a circuit for generating a constant current control signal. SOLUTION: When a power-supply voltage (a) applied to a traveling wave tube 7 is stopped and a capacitor (C) is discharged in a process for stopping a high voltage (e) to the traveling wave tube 7 by a power supply control circuit 8, a second driving control signal is fed to a constant current circuit (12) side through a control signal switching circuit 11. Then, the constant current control circuit 12 generates constant current control signals α and β to a chopper-type switching circuit 3 on the basis of a second driving control signal. Each second switching element in an inverter circuit 4 is controlled in an active region. As a result, the charged power in the capacitor (C) can be discharged without unnecessary charge, so charging control is carried out safely and steadily even in a small-size circuit. |
