| 摘要 |
PURPOSE:To stabilize voltage supplied to a high-voltage transformer, a magnetron and the like by detecting the difference between the electric potentials of the ends of the magnetron, and changing the operational frequency of the high- voltage transformer or the like when the detected value is unusual. CONSTITUTION:The partial pressure of a voltage dividing circuit 23 rises when the voltage of a power source is increased. As the result, the period between the pulses of a time-constant circuit 13 of a nonstable multivibrator (MV) 9 is shortened, the frequency of the pulse generation is increased, and the current flowing through a magnetron 1 tends to be decreased. Accordingly, the increase of the current fed to the magnetron 1 is suppressed. In contrast, when the voltage of the power source is decreased, the generation frequency of the MV 9 is decreased, and the decrease of the current fed to the magnetron is suppressed. |
