Microwave generator and microwave generation method

Abstract

To provide a microwave generation device in which a shit between an oscillation state and an oscillation stopped state of an oscillation circuit section is smoothly performed.SOLUTION: A microwave generation device 10 comprises an oscillation circuit section 20, an oscillation stopped state detection section 40, and a control section 30. The oscillation circuit section 20 outputs a high frequency which is used for generating microwaves. The oscillation stopped state detection section 40 detects whether or not the oscillation circuit section 20 is in an oscillation stopped state. The control section 30 inputs a bias voltage to the oscillation circuit section 20. The control section 30 confirms a detection result due to the oscillation stopped state detection section 40. In a case where it is detected that the oscillation circuit section 20 is not in the oscillation stopped state, the control section 30 decreases the bias voltage. In a case where it is detected that the oscillation circuit section 20 is in the oscillation stopped state, the control section 30 stops decreasing the bias voltage.SELECTED DRAWING: Figure 1

Claims

1. An oscillator circuit section that outputs high frequencies belonging to the microwave band, The oscillation circuit section includes an oscillation stop state detection unit that detects whether or not the oscillation has stopped, The system comprises a control unit that inputs a bias voltage to the oscillation circuit section, The oscillation circuit section enters an oscillation state or an oscillation stop state depending on the magnitude of the input bias voltage. The control unit alternately switches between an oscillation period in which the oscillation state of the oscillation circuit continues and a stop period which begins after the end of the oscillation period and in which the oscillation stop state of the oscillation circuit continues, and adjusts the average output of the high frequency by changing the ratio of the oscillation period and the stop period. The control unit, At the start of the oscillation period, the oscillation process is performed to increase the bias voltage to the oscillation voltage necessary for the oscillation circuit to oscillate. A microwave generator that, during the aforementioned stop period, checks the detection result by the oscillation stop state detection unit, and if it is detected that the oscillation circuit is not in an oscillation stop state, reduces the bias voltage, and if it is detected that the oscillation circuit is in an oscillation stop state, stops reducing the bias voltage.

2. The microwave generator according to claim 1, wherein the oscillation stop state detection unit is a power detection circuit that detects the power output of the oscillation circuit unit, or a current detection circuit that detects the current input to the oscillation circuit unit.

3. The microwave generator according to claim 1, wherein the control unit stores the value of the bias voltage at the time it is detected that the oscillation circuit is in an oscillation-stopped state as an initial value, and when the oscillation circuit performs the next oscillation-stop, the bias voltage is set to the initial value.

4. The microwave generator according to claim 3, wherein if the oscillation circuit is not detected to be in an oscillation-stopped state when the bias voltage is set to the initial value, the control unit reduces the bias voltage from the initial value.

5. A bias voltage is input to the oscillator circuit that outputs high frequencies belonging to the microwave band. The oscillation circuit section enters an oscillation state or an oscillation stop state depending on the magnitude of the input bias voltage. The average high-frequency output is adjusted by alternately switching between an oscillation period in which the oscillation state of the oscillation circuit continues and a stop period that begins after the end of the oscillation period and in which the oscillation stop state of the oscillation circuit continues, and by changing the ratio of the oscillation period and the stop period. At the start of the oscillation period, the oscillation process is performed to increase the bias voltage to the oscillation voltage necessary for the oscillation circuit to oscillate. During the aforementioned stop period, it is detected whether or not the oscillation circuit is in an oscillation-stopped state. A microwave generation method wherein, if it is detected that the oscillation circuit is not in an oscillation-stopped state, the bias voltage input to the oscillation circuit is reduced, and if it is detected that the oscillation circuit is in an oscillation-stopped state, the reduction of the bias voltage is stopped.

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