| 摘要 |
PROBLEM TO BE SOLVED: To constitute a circuit with a few component parts, by which destroy of a microwave tube by being impressed with excessive voltage at the time of OFF of power source voltage is prevented, in an electric power device for the microwave tubes. SOLUTION: Voltage between a helix power supply terminal and a cathode power supply terminal is divided in to the voltage that is a little lower than the voltage of a collector power supply terminal, and a unidirectional conducting means is provided between this divided point and the collector power supply terminal. If the voltage of the collector power supply terminal approaches the voltage of the cathode power supply terminal to become lower than the voltage of the divided point, this unidirectional conducting means conducts to clamp the voltage of the collector power supply terminal to the voltage almost equal to the voltage of the divided point. Since the voltage impressed on the both ends of the unidirectional conducting means is low, it is not necessary to connect many parts in series for securing breakdown of voltage, and it is possible to miniaturize the circuit. COPYRIGHT: (C)2004,JPO
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