| 摘要 |
PURPOSE:To enable a rated output to be automatically retained by providing an output voltage detection tap in a input transformer secondary winding of a magnetron oscillator, detecting oscillation starting of the oscillator by variations of the output voltage, and immediately controlling a power source input current. CONSTITUTION:An output voltage detection tap is provided in an input transformer secondary side 13 of a magnetron oscillator 15 driven with an inverter 8. And a detected current of an input current detection part 16 of the power source is compared with a current base 18 with a comparator 19. Then the output is made to an on/off pulse 22 with a comparator 20 and saw-tooth-wave generator 21, and the input current is retained at a given value with a turned on electricity time of the inverter 8 controlled. The output of the output tap of the winding 13, in the condition, is compared to the base voltage with a comparator 27, and a value of the base 18 is made to change with a transistor 29 controlled by the output. This enables the rated output of magnetron to be produced concurrent with its oscillation starting with the input current controlled.
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