A method for increasing the power of a magnetron in a microwave oven

Abstract

The application discloses a microwave oven magnetron high-power control method and belongs to the field of high-power magnetron control methods. The method changes the mode of the microwave oven magnetron to pulse excitation, first tests optimal working parameters, and then tests optimal excitation signals, that is, obtains the working parameters and the excitation signals corresponding to the maximum output power under the pulse working mode. The application provides a specific test mode to obtain the optimal working parameters and the optimal excitation signals of the microwave oven magnetron, so that the microwave oven magnetron can generate high-power microwave output of the order of ten kilowatts, realizes the high-power output of the microwave oven magnetron with low cost and small size, and expands the application scenarios of the microwave oven magnetron.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high-power magnetron control method, and relates to a method for improving the power of a microwave oven magnetron. BACKGROUND

[0002] The microwave oven magnetron is a mature market microwave source device, which adopts a thoriated tungsten cathode as a magnetron cathode, and can stably output microwave power of about 1000W at a frequency of 2450MHz under continuous wave working conditions of an anode voltage of 4000V and a working magnetic field of about 0.18. SUMMARY

[0003] In view of the defects in the prior art, the application provides a method for improving the power of a microwave oven magnetron.

[0004] The technical scheme adopted by the application is as follows:

[0005] A method for improving the power of a microwave oven magnetron, characterized in that the method comprises the following steps:

[0006] S1. determining the filament current I of the microwave oven magnetron when the microwave oven magnetron works in continuous wave mode, min , the anode voltage V min , and the magnetic field B min ;

[0007] S2. when the microwave oven magnetron is excited in a pulse working mode, the frequency range of the excitation signal is f min -f max , and the pulse width range is Pw min -Pw max ;

[0008] S3. selecting the frequency f of the initial excitation signal as min , and the pulse width Pw as min , and exciting the microwave oven magnetron in a pulse mode; at this time, the initial filament current is I min , the initial anode voltage is V min , the initial magnetic field is B min , and the output power of the microwave oven magnetron is detected and recorded;

[0009] S4. increasing the filament current; at this time, the anode voltage is changed in a step-by-step manner, and the magnetic field is changed in a step-by-step manner at each anode voltage, and a group of output powers of the microwave oven magnetron and corresponding working parameters are detected and recorded;

[0010] S5. Increase the filament current in a step-by-step manner, repeat step S4, detect and record the output power of the microwave oven magnetron and the corresponding working parameters; at this time, the working parameters corresponding to the maximum output power obtained are taken as the optimal working parameters;

[0011] S6. Keep the filament current, anode voltage and magnetic field of the microwave oven magnetron as the optimal working parameters; then adjust the repetition frequency and pulse width of the excitation signal in a step-by-step manner to obtain the optimal excitation signal corresponding to the maximum output power; realize the power promotion of the microwave oven magnetron power.

[0012] Further, the repetition frequency range of the excitation signal is 100-500Hz, and the pulse width range is 1us-5us.

[0013] Further, the filament current is an alternating current; the anode voltage is a pulse high voltage; and the magnetic field is a static magnetic field.

[0014] Further, the filament current range is 10-20A, the anode voltage peak value range is 4.0kV-12.0kV, and the static magnetic field range is 0.12-0.27T.

[0015] The method of the present application provides a specific test method to obtain the optimal working parameters and the optimal excitation signal of the microwave oven magnetron, and by changing the working mode of the existing microwave oven magnetron to the optimal working parameters and the optimal excitation signal, the microwave oven magnetron can generate high-power microwave output of ten kilowatt level, realizing the high-power output of the low-cost and small-size microwave oven magnetron, and expanding the application scenarios of the microwave oven magnetron. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The flow chart of the method for promoting the power of the microwave oven magnetron.

[0017] Figure 2 The experimental result graph of the method for promoting the power of the microwave oven magnetron. DETAILED DESCRIPTION

[0018] The technical solutions of the present application will be further described in detail below with reference to the drawings. However, it should be understood that these descriptions are only exemplary and do not limit the practical range of the present application.

[0019] A method for promoting the power of the microwave oven magnetron of the present embodiment, as shown in Figure 1 , includes the following steps:

[0020] S1. The model of the microwave oven magnetron in the present embodiment is 2M219J type magnetron, and when it works in continuous wave, the filament current I minV is 9A, anode voltage V min B is 4500V, magnetic field B min 0.18T, and the corresponding output power is 1000W.

[0021] S2. When the microwave oven magnetron is excited in the pulse operation mode, the frequency range of the excitation signal is 100-500Hz, and the pulse width range is 1-5μs.

[0022] S3. The microwave oven magnetron is placed in an electromagnet system, and a waveguide transmission system is used for measurement; the initial excitation signal frequency f min is 10Hz, and the pulse width Pw min is 1μs; the microwave oven magnetron is pulsed excited; at this time, the initial filament current is I min , the initial anode voltage is V min , the initial magnetic field is B min , and the output power of the microwave oven magnetron is detected and recorded.

[0023] S4. The filament current is increased and kept; the anode voltage is changed in a step-by-step manner, and the magnetic field is changed in a step-by-step manner at each anode voltage, and a group of output powers of the microwave oven magnetron and corresponding working parameters (filament current, anode voltage, magnetic field) are detected and recorded.

[0024] S5. The filament current is increased in a step-by-step manner, step S4 is repeated, and a plurality of groups of output powers of the microwave oven magnetron and corresponding working parameters are detected and recorded; at this time, the working parameters corresponding to the maximum output power obtained are taken as the optimal working parameters. In this embodiment, the maximum output power at this time is 30kW, the optimal filament current is 19A, the anode voltage is 11kV, and the magnetic field is 0.247T.

[0025] S6. The filament current, anode voltage, and magnetic field of the microwave oven magnetron are kept as the optimal working parameters; then the frequency and pulse width of the excitation signal are adjusted in a step-by-step manner to obtain the optimal excitation signal corresponding to the maximum output power, and in this embodiment, the maximum output power is 40kW, the optimal frequency is 100Hz, and the pulse width is 2μs.

[0026] Through the above method, finally, the microwave oven magnetron has a maximum output power of 40kW when the pulse excitation signal is 100Hz in frequency and 2μs in pulse width, the filament current is 19A of alternating current, the anode voltage is 11kV in peak value, and the working magnetic field is 0.247T in static magnetic field. Compared with the continuous wave operation mode, the output power is increased by 40 times, which shows that the method can effectively improve the output power of the microwave oven magnetron and expand its application scenarios.

Claims

1. A method for increasing the power of a microwave oven magnetron, characterized in that, Includes the following steps: S1. Determine the filament current I of the microwave oven magnetron when operating in continuous wave mode. min Anode voltage V min Magnetic field B min ; S2. When setting the pulse operation mode to excite the microwave oven magnetron, the repetition frequency range of the excitation signal is f. min -f max Pulse width range Pw min -Pw max ; S3. Select the repetition frequency of the initial excitation signal as f. min Pulse width is Pw min The microwave oven magnetron is pulse-excited; At this time, the initial filament current is I. min The initial anode voltage is V min The initial magnetic field is B min The output power of the microwave oven magnetron was detected and recorded. S4. Increase the filament current; at this time, change the anode voltage in a step manner, and change the magnetic field in a step manner under each anode voltage, detect and record the output power and corresponding operating parameters of a set of microwave oven magnetrons; S5. Increase the filament current in a stepwise manner, repeat step S4, and detect and record the output power and corresponding operating parameters of multiple sets of microwave oven magnetrons; at this time, the operating parameter corresponding to the maximum output power is taken as the optimal operating parameter. S6. Maintain the filament current, anode voltage, and magnetic field of the microwave oven magnetron at their optimal operating parameters; then adjust the repetition rate and pulse width of the excitation signal in a stepwise manner to obtain the optimal excitation signal corresponding to the maximum output power; thereby achieving a power increase in the microwave oven magnetron.

2. The method for increasing the power of a microwave oven magnetron as described in claim 1, characterized in that, The excitation signal has a repetition frequency range of 100-500Hz and a pulse width range of 1μs-5μs.

3. The method for increasing the power of a microwave oven magnetron as described in claim 2, characterized in that, The filament current is an alternating current; the anode voltage is a pulsed high voltage; and the magnetic field is a static magnetic field.

4. The method for increasing the power of a microwave oven magnetron as described in claim 3, characterized in that, The filament current ranges from 10 to 20 A; the peak anode voltage ranges from 4.0 kV to 12.0 kV; and the static magnetic field ranges from 0.12 to 0.27 T.

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