Method for improving power of magnetron of microwave oven

Abstract

The invention discloses a microwave oven magnetron high-power control method, and belongs to the field of high-power magnetron control methods. According to the method, the mode of a microwave oven magnetron is changed into pulse excitation, the optimal working parameters are obtained through testing firstly, then the optimal excitation signals are obtained through testing, and the working parameters and the excitation signals corresponding to the maximum output power in the pulse working mode are obtained. The invention provides a specific test mode to obtain the optimal working parameters and the optimal excitation signal of the microwave oven magnetron, so that the microwave oven magnetron can generate high-power microwave output of ten kilowatt magnitude, the high-power output of the low-cost and small-size microwave oven magnetron is realized, and the application scene of the microwave oven magnetron is expanded.

Description

Technical Field

[0001] The invention belongs to the technical field of high-power magnetron control methods and relates to a method for improving the power of a microwave oven magnetron. Background Art

[0002] Microwave oven magnetron is a mature market-oriented microwave source device. It uses the currently more mature thoriated tungsten cathode as the magnetron cathode, and can stably output microwave power of about 1000W and frequency of 2450MHz under the continuous wave working conditions of anode voltage of 4000V and working magnetic field of about 0.18. The cost of high-power magnetron in the same frequency band as microwave oven magnetron is much higher than that of microwave oven magnetron. Therefore, it is very necessary to study a magnetron with low cost, small size and high power. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention provides a method for improving the power of a microwave oven magnetron. The method of the present invention can effectively improve the output power of the microwave oven magnetron by changing the working mode of the existing microwave oven magnetron and expand the application scenarios of the microwave oven magnetron.

[0004] The technical solution adopted by the present invention is as follows:

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

[0006] S1. Determine the filament current I of the microwave oven magnetron when it is operating in continuous wave min , anode voltage V min , magnetic field B min ;

[0007] S2. When the pulse working mode is set 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 ;

[0008] S3. Select the repetition frequency of the initial excitation signal as f min , pulse width is Pw min , pulse excitation is applied to the microwave oven magnetron; at this time, the initial filament current is I min , the initial anode voltage is V min , the initial magnetic field is B min , detect and record the output power of microwave oven magnetron;

[0009] S4. Increase the filament current; at this time, change the anode voltage in a step-by-step manner, and change the magnetic field in a step-by-step manner at each anode voltage, and detect and record the output power and corresponding operating parameters of a group of microwave oven magnetrons;

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

[0011] S6. Maintain the filament current, anode voltage, and magnetic field of the microwave oven magnetron as optimal operating parameters; then adjust the repetition rate 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; and achieve a power increase of the microwave oven magnetron.

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

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

[0014] Furthermore, the filament current ranges from 10A to 20A; the anode voltage peak ranges from 4.0kV to 12.0kV; and the static magnetic field ranges from 0.12T to 0.27T.

[0015] The method of the present invention provides a specific testing method to obtain the optimal operating parameters and optimal excitation signals of a microwave oven magnetron. By changing the working mode of the existing microwave oven magnetron to the optimal operating parameters and optimal excitation signals, the microwave oven magnetron can generate a high-power microwave output of the order of tens of kilowatts, thereby achieving high-power output of a low-cost, small-volume microwave oven magnetron and expanding the application scenarios of the microwave oven magnetron. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a flow chart of the method for increasing the power of a microwave oven magnetron.

[0017] Figure 2 This is a diagram of the experimental results of the present invention for improving the power of the microwave oven magnetron. DETAILED DESCRIPTION

[0018] The following embodiments are combined with the accompanying drawings to further illustrate the technical solution of the present invention. However, it should be understood that these descriptions are only exemplary and do not limit the practical scope of the present invention.

[0019] A method for increasing the power of a microwave oven magnetron according to this embodiment is as follows: Figure 1 As shown, the following steps are included:

[0020] S1. The model of the microwave oven magnetron in this embodiment is 2M219J magnetron. When operating in continuous wave mode, its filament current I min9A, anode voltage V min 4500V, magnetic field B min It is 0.18T, and the corresponding output power is 1000W.

[0021] S2. When the pulse working mode is set to excite the microwave oven magnetron, the repetition frequency range of the excitation signal is 100-500Hz and the pulse width range is 1μs-5μs.

[0022] S3. Place the microwave oven magnetron in the electromagnet system and use the waveguide transmission system to measure; select the repetition frequency f of the initial excitation signal min The pulse width is 10Hz, Pw min The microwave oven magnetron is pulsed with a current of 1 μs. At this time, the initial filament current is I min , the initial anode voltage is V min , the initial magnetic field is B min , detect and record the output power of the microwave oven magnetron.

[0023] S4. Increase the filament current and maintain it; change the anode voltage in a step-by-step manner, and change the magnetic field in a step-by-step manner at each anode voltage, detect and record a set of output powers and corresponding operating parameters (filament current, anode voltage, magnetic field) of the microwave oven magnetron.

[0024] S5. Increase the filament current in a stepwise manner, repeat step S4, detect and record the output power and corresponding working parameters of multiple groups of microwave oven magnetrons; 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, and the corresponding optimal filament current is 19A, the anode voltage is 11kV, and the magnetic field is 0.247T.

[0025] S6. Maintain the filament current, anode voltage, and magnetic field of the microwave oven magnetron at the optimal operating parameters; then adjust the repetition rate 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. In this embodiment, the maximum output power is 40kW, and the corresponding optimal repetition rate is 100Hz and the pulse width is 2μs.

[0026] Through the above method, it is finally obtained that the microwave oven magnetron has a maximum output power of 40kW when the pulse excitation signal is a repetition rate of 100Hz, a pulse width of 2μs, a filament current of 19A AC, an anode voltage of 11kV peak value, and a working magnetic field of 0.247T static magnetic field. Compared with the continuous wave working mode, its output power is increased by 40 times, indicating that the method of the present invention can effectively increase 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: The steps include: S1. Determine the filament current I of the microwave oven magnetron when it is working in continuous wave min , anode voltage V min , magnetic field B min ; S2. When the pulse working mode is set 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 , pulse excitation of microwave oven magnetron; At this time, the initial filament current is I min , the initial anode voltage is V min , the initial magnetic field is B min , detect and record the output power of microwave oven magnetron; S4. Increase the filament current; at this time, change the anode voltage in a step-by-step manner, and change the magnetic field in a step-by-step manner at each anode voltage, and detect and record the output power and corresponding operating parameters of a group of microwave oven magnetrons; S5. Increase the filament current in a stepwise manner, repeat step S4, detect and record the output power and corresponding operating parameters of multiple groups of microwave oven magnetrons; at this time, the operating parameters corresponding to the maximum output power obtained are taken as the optimal operating parameters; S6. Maintain the filament current, anode voltage, and magnetic field of the microwave oven magnetron as optimal operating parameters; then adjust the repetition rate 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; and achieve a power increase of the microwave oven magnetron.

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

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

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