Electromagnetic wave processing device

Abstract

The invention provides an electromagnetic wave processing device. The electromagnetic wave processing device comprises a cavity and an electromagnetic wave generation system. The cavity is used for placing a to-be-processed object and is provided with a shielding feature. The electromagnetic wave generating system is at least partially arranged in the cavity or communicated to the cavity so as to process the object to be processed through electromagnetic waves. The electromagnetic wave generation system comprises a frequency source, a power amplifier and a conversion comparison unit. The conversion comparison unit is configured to convert an electromagnetic wave signal outside the shielding feature into a safety bias signal, and is electrically connected with the power amplifier to automatically adjust the power of the electromagnetic wave signal according to the electromagnetic leakage amount of the cavity, so that the electromagnetic wave generation system stops working or the electromagnetic wave energy outside the cavity is reduced to a safety range. The invention is particularly suitable for refrigerators.

Description

Technical Field

[0001] The present invention relates to the field of electrothermal technology, and in particular to an electromagnetic wave processing device. Background Art

[0002] During the freezing process of food, the quality of the food is maintained, but the frozen food needs to be thawed before processing or eating. In order to facilitate users to freeze and thaw food, the prior art generally thaws food by electromagnetic waves, and an electromagnetic wave generating system is arranged in the refrigerator.

[0003] However, the electromagnetic waves generated by the electromagnetic wave generating system can easily affect or interfere with the surrounding food stored at low temperatures and the surrounding electrical devices. Although setting an electromagnetic shielding feature in the cavity can effectively reduce the leakage of electromagnetic waves, the shielding feature will degrade in performance after long-term use, and too many electromagnetic waves will leak around the cavity, causing the above-mentioned effects or interference to be serious. Summary of the invention

[0004] An object of the present invention is to overcome at least one technical defect in the prior art and provide an electromagnetic wave processing device.

[0005] A further object of the present invention is to improve the safety of electromagnetic wave treatment devices.

[0006] Another further object of the present invention is to reduce the production cost of the electromagnetic wave processing device.

[0007] In particular, the present invention provides an electromagnetic wave processing device, comprising:

[0008] A cavity, used to place the object to be processed and provided with shielding features; and

[0009] An electromagnetic wave generating system is at least partially disposed in the cavity or connected to the cavity to process the object to be processed by electromagnetic waves; wherein the electromagnetic wave generating system comprises:

[0010] A frequency source for generating an electromagnetic wave signal;

[0011] A power amplifier, used to amplify the power of the electromagnetic wave signal; and

[0012] The conversion and comparison unit is configured to convert the electromagnetic wave signal outside the shielding feature into a safety bias signal and is electrically connected to the power amplifier to automatically adjust the power of the electromagnetic wave signal according to the electromagnetic leakage amount of the cavity.

[0013] Optionally, the conversion comparison unit includes:

[0014] a receiving conversion module, configured to receive an electromagnetic wave signal outside the shielding feature and convert the received electromagnetic wave signal into a receiving voltage signal; and

[0015] The voltage comparison module is configured to compare the received voltage signal with at least one threshold voltage signal and generate different safety bias signals according to the comparison result.

[0016] Optionally, the receiving conversion module includes:

[0017] A receiving antenna, disposed outside the shielding feature, for receiving electromagnetic wave signals outside the shielding feature;

[0018] A detector tube connected in series between the receiving antenna and the voltage comparison module; and

[0019] A filter capacitor has one end connected in series between the detector tube and the voltage comparison module and the other end grounded, and together with the detector tube converts the electromagnetic wave signal received by the receiving antenna into a receiving voltage signal.

[0020] Optionally, the receiving conversion module further includes:

[0021] An attenuation resistor is connected in series between the detector tube and the voltage comparison module, and one end of the filter capacitor is connected in series between the attenuation resistor and the voltage comparison module.

[0022] Optionally, the at least one threshold voltage signal includes a first threshold voltage signal and a second threshold voltage signal, and the voltage comparison module includes:

[0023] A first comparator, whose inverting input terminal is configured to receive the receiving voltage signal, and whose non-inverting input terminal is configured to receive the first threshold voltage signal; and

[0024] The second comparator, the inverting input terminal is configured to receive the receiving voltage signal, and the non-inverting input terminal is configured to receive the second threshold voltage signal; wherein,

[0025] A voltage value of the second threshold voltage signal is smaller than a voltage value of the first threshold voltage signal.

[0026] Optionally, the voltage comparison module further includes:

[0027] The triode, the base is set to be electrically connected to the output end of the second comparator, and the collector is set to be grounded; wherein,

[0028] A first voltage-dividing resistor is connected in series between the emitter and the base of the transistor, and one end of the first voltage-dividing resistor close to the base is electrically connected to the power amplifier through a second voltage-dividing resistor so that the input voltage of the emitter is used to form the safety bias signal when the transistor is in a cut-off state.

[0029] Optionally, the voltage comparison module includes:

[0030] A plurality of comparators, configured to compare the received voltage signal with a plurality of the threshold voltage signals respectively; and

[0031] A plurality of diodes are configured to respectively block current from flowing from the power amplifier to the plurality of comparators.

[0032] Optionally, the voltage comparison module further includes:

[0033] At least one voltage divider circuit, each of which includes an upper voltage divider resistor and a lower voltage divider resistor, wherein one end of the lower voltage divider resistor is connected in series with the upper voltage divider resistor and the other end is grounded; wherein,

[0034] A voltage input terminal is formed at one end of the upper voltage-dividing resistor away from the lower voltage-dividing resistor, and a voltage output terminal is formed between the upper voltage-dividing resistor and the lower voltage-dividing resistor; and

[0035] An input terminal of each comparator for receiving the threshold voltage signal is connected in series with a voltage divider circuit; and / or

[0036] A voltage divider circuit is connected in series between at least one of the comparators and the corresponding diode; and / or

[0037] A voltage divider circuit is connected in series between the multiple diodes and the power amplifier.

[0038] Optionally, the power amplifier comprises:

[0039] A primary amplifying circuit, used to amplify the power of the electromagnetic wave signal; and

[0040] The secondary amplifier circuit is connected to the output end of the primary amplifier circuit and is used to amplify the power of the output signal of the primary amplifier circuit; wherein,

[0041] One of the primary amplifying circuit and the secondary amplifying circuit is configured to receive the safety bias signal to automatically adjust the power of the electromagnetic wave signal according to the voltage value of the safety bias signal.

[0042] Optionally, the secondary amplifier circuit is configured to receive the safety bias signal so as to stop the secondary amplifier circuit from working or reduce the amplification ratio of the output signal of the primary amplifier circuit; and

[0043] The primary amplifying circuit is configured to receive a regulating bias signal, and the regulating bias signal is configured to be adjusted according to at least one of a user instruction, a characteristic parameter of the object to be processed, and a reflected signal returned to the electromagnetic wave generating system.

[0044] The electromagnetic wave processing device of the present invention converts the electromagnetic wave signal outside the shielding feature into a safety bias signal through a conversion and comparison unit and transmits it to the power amplifier, so that the power amplifier can automatically adjust the power of the electromagnetic wave signal according to the electromagnetic leakage amount of the cavity, thereby stopping the electromagnetic wave generating system from working or reducing the electromagnetic wave energy outside the cavity to a safe range. The device is particularly suitable for refrigerators.

[0045] Furthermore, the voltage comparison module of the present invention includes two comparators and a transistor electrically connected to one of the comparators, which can automatically realize multi-level adjustment of the power of the electromagnetic wave signal, facilitate factory configuration of the electromagnetic wave power when the electromagnetic wave leakage is within a safe range, and has a simple structure, reducing the generation cost of the processing device.

[0046] Furthermore, the present invention enables the primary amplifier circuit to receive a control bias signal and the secondary amplifier circuit to receive a safety bias signal, which can not only safely and effectively reduce the power of the electromagnetic wave signal when there is a lot of electromagnetic wave leakage, but also reduce the problem of unstable electromagnetic wave signal jitter output by the power amplifier when the electromagnetic wave leakage is within a safe range, thereby achieving accurate and efficient processing of the object to be processed.

[0047] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0049] Figure 1 is a schematic structural diagram of an electromagnetic wave processing device according to an embodiment of the present invention;

[0050] Figure 2 is a schematic structural diagram of a power amplifier according to an embodiment of the present invention;

[0051] Figure 3 yes Figure 2 A schematic circuit diagram of a primary amplifier circuit, a secondary amplifier circuit and a corresponding matching circuit;

[0052] Figure 4 yes Figure 2 A schematic circuit diagram of a final stage matching circuit, a filtering circuit, and a coupling circuit;

[0053] Figure 5 is a schematic circuit diagram of a conversion comparison unit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0054] Figure 1 is a schematic structural diagram of an electromagnetic wave processing device according to an embodiment of the present invention. Figure 1 , the electromagnetic wave processing device 100 may include a cavity 110 and an electromagnetic wave generating system.

[0055] The cavity 110 can be used to accommodate and process the object 170 and is provided with shielding features to reduce electromagnetic wave leakage.

[0056] The electromagnetic wave generating system may be at least partially disposed in the cavity 110 or accessible to the cavity 110, so as to process the object to be processed 170 by electromagnetic waves. Exemplarily, the processing of the object to be processed 170 in the present invention is heating.

[0057] The electromagnetic wave generating system may include a frequency source 120, a power amplifier 130, a radiation antenna 140, a power supply module 150, and a controller 160. The frequency source 120 may be configured to generate an electromagnetic wave signal.

[0058] The power amplifier 130 may be configured to be connected to the frequency source 120 to amplify the power of the electromagnetic wave signal.

[0059] The radiation antenna 140 may be disposed in the cavity 110 and electrically connected to the power amplifier 130 to radiate the amplified electromagnetic waves into the cavity 110 .

[0060] The power supply module 150 may be configured to be electrically connected to the frequency source 120 and the power amplifier 130 to provide electrical energy to the frequency source 120 and the power amplifier 130 .

[0061] Figure 2 FIG. 1 is a schematic structural diagram of a power amplifier 130 according to an embodiment of the present invention. Figure 2 The power amplifier 130 for amplifying electromagnetic wave signals of the present invention may include a primary amplifying circuit 210 , a secondary amplifying circuit 220 , a filtering circuit 230 , a primary matching circuit 240 , a secondary matching circuit 250 , and a final matching circuit 260 .

[0062] Specifically, the primary amplifying circuit 210 may be used to amplify the power of the electromagnetic wave signal. The secondary amplifying circuit 220 may be connected to the output end of the primary amplifying circuit 210 to amplify the power of the output signal of the primary amplifying circuit 210 .

[0063] The filter circuit 230 may be connected to the secondary amplifier circuit 220 to filter out high-order harmonics to reduce interference to other electrical devices.

[0064] The primary matching circuit 240 may be connected to the input end of the primary amplifying circuit 210 and configured to achieve impedance matching between the primary amplifying circuit 210 and the electromagnetic wave signal.

[0065] The secondary matching circuit 250 may be connected in series between the primary amplifying circuit 210 and the secondary amplifying circuit 220 , and is configured to achieve impedance matching of output signals of the secondary amplifying circuit 220 and the primary amplifying circuit 210 .

[0066] The final matching circuit 260 may be connected in series between the secondary amplifying circuit 220 and the filtering circuit 230 , and configured to achieve impedance matching between the filtering circuit 230 , the transmission line connected to the output end of the power amplifier 130 , and the output signal of the secondary amplifying circuit 220 .

[0067] The power amplifier 130 of the present invention includes a multi-stage amplification circuit, a filter circuit 230 and a multi-stage matching circuit. It not only has a large power adjustment range, but can flexibly adjust the frequency for different types and states of the objects to be processed 170, thereby improving the heating effect, but also can reduce signal interference to other electrical components, respectively improve the output power of each amplification circuit and filter circuit 230, and reduce reflections returned to the upper circuit, thereby improving the output power of the output end of the power amplifier 130 and the service life of the amplification circuit (especially the transistor).

[0068] Figure 3 yes Figure 2 Schematic circuit diagram of the primary amplifier circuit 210, the secondary amplifier circuit 220 and the corresponding matching circuit (in Figure 3 and Figure 4 In “RF in " stands for "electromagnetic wave input signal"; "RF out ” means “electromagnetic wave output signal”). Figure 3 The primary amplifier circuit 210 and the secondary amplifier circuit 220 include a transistor, a bias part, and a power supply part, respectively.

[0069] The bias part can be connected to the gate of the transistor to generate a DC bias signal BIAS0 to the transistor, so that the transistor amplifies the electromagnetic wave signal.

[0070] The power supply part may be connected to the drain of the transistor for supplying power to the transistor.

[0071] In some embodiments, the transistor U301 of the primary amplifier circuit 210 can be selected from ST-PD84002, ST-PD85004, or NXP-AFT05MS003N.

[0072] The biasing portion of the primary amplifier circuit 210 may include a plurality of first decoupling capacitors, a first choke inductor L304 , and an isolation resistor R306 .

[0073] The first decoupling capacitors of the primary amplifier circuit 210 may have one end connected to the DC bias signal BIAS0 and the other end grounded, so as to reduce the high frequency in the DC bias signal BIAS0.

[0074] In the illustrated embodiment, the first decoupling capacitors of the primary amplifier circuit 210 may include capacitor C320, capacitor C322, and capacitor C324. Capacitors C320, C322, and C324 may be of different orders of magnitude, with a capacitance value of 10pF to 100nF, to improve filtering effect.

[0075] The first choke inductor L304 can be connected to the DC bias signal BIAS0 to prevent high frequency from being transmitted to the transistor U301.

[0076] The isolation resistor R306 may be connected in series between the first choke inductor L304 and the gate of the transistor U301 to reduce the impedance effect of the DC bias signal BIAS0 on the power amplifier 130 and absorb the electromagnetic wave signal transmitted to the isolation resistor R306 .

[0077] The power supply part of the primary amplifier circuit 210 may include a plurality of second decoupling capacitors and a second choke inductor L301 .

[0078] The plurality of second decoupling capacitors of the primary amplifier circuit 210 may have one end connected to the power supply voltage signal PA and the other end grounded, so as to reduce high frequencies in the power supply voltage signal PA.

[0079] In the illustrated embodiment, the plurality of second decoupling capacitors of the primary amplifier circuit 210 may include capacitor C318, capacitor C319, and capacitor C321. Capacitors C318, C319, and C321 may be of different orders of magnitude, with a capacitance value of 10pF to 100nF, to improve filtering effect.

[0080] The second choke inductor L301 can be connected to the power supply voltage signal PA at one end and to the drain of the transistor U301 at the other end to prevent high frequency from entering the transistor U301. The second choke inductor L301 can be a wire wound inductor with a copper wire diameter greater than 1 mm to ensure filtering effect.

[0081] In some embodiments, the transistor V302 of the secondary amplifier circuit 220 may be an N-channel enhancement type transistor.

[0082] The biasing portion of the secondary amplifier circuit 220 may include a plurality of first decoupling capacitors, a first choke inductor L306 , and an isolation resistor R310 .

[0083] The plurality of first decoupling capacitors of the secondary amplifier circuit 220 may have one end connected to the DC bias signal BIAS1 and the other end grounded, so as to reduce the high frequency in the DC bias signal BIAS1.

[0084] In the illustrated embodiment, the plurality of first decoupling capacitors of the secondary amplifier circuit 220 may include capacitor C330, capacitor C331, capacitor C332, and capacitor C333. Capacitors C330, C331, C332, and C333 may be of different orders of magnitude, with a capacitance value of 10pF to 100nF, to improve filtering effect.

[0085] The first choke inductor L306 can be connected to the DC bias signal BIAS1 to prevent high frequency from being transmitted to the transistor V302.

[0086] The isolation resistor R310 may be connected in series between the first choke inductor L306 and the gate of the transistor V302 to reduce the impedance effect of the DC bias signal BIAS1 on the power amplifier 130 and absorb the electromagnetic wave signal transmitted to the isolation resistor R310 .

[0087] The power supply part of the secondary amplifier circuit 220 may include a plurality of second decoupling capacitors and a second choke inductor L307 .

[0088] The plurality of second decoupling capacitors of the secondary amplifier circuit 220 may have one end connected to the power supply voltage signal PA and the other end grounded, so as to reduce high frequencies in the power supply voltage signal PA.

[0089] In the illustrated embodiment, the plurality of second decoupling capacitors of the secondary amplifier circuit 220 may include capacitor C325, capacitor C326, and capacitor C327. Capacitors C325, C326, and C327 may be of different orders of magnitude, with a capacitance value of 10pF to 100nF, to improve filtering effect.

[0090] The second choke inductor L307 can be connected to the power supply voltage signal PA at one end and to the drain of the transistor V302 at the other end to prevent high frequency from entering the transistor V302. The second choke inductor L307 can be a wire wound inductor with a copper wire diameter greater than 1 mm to ensure filtering effect.

[0091] The secondary amplifier circuit 220 may further include a third decoupling capacitor C335 , one end of which is connected between the first choke inductor L306 and the isolation resistor R310 , and the other end of which is grounded to reduce signal strength and ensure a good filtering effect.

[0092] In some further embodiments, the gain ratio of the primary amplifier circuit 210 may be greater than or equal to 1 and less than or equal to 3 to reduce production costs.

[0093] In some further embodiments, the output power ratio of the primary amplifier circuit 210 to the secondary amplifier circuit 220 may be 1 / 20 to 1 / 100 to reduce production costs.

[0094] In some embodiments, the primary matching circuit 240 may include a first matching capacitor C306 , a second matching capacitor C311 , and a first matching inductor L300 .

[0095] The first matching capacitor C306 can be connected to the input terminal of the power amplifier 130. The second matching capacitor C311 can be connected to the first matching capacitor C306 at one end and grounded at the other end. The first matching inductor L300 can be connected to the first matching capacitor C306 at one end and connected to the primary amplifier circuit 210 at the other end.

[0096] In some embodiments, the secondary matching circuit 250 may include a third matching capacitor C313 and a fourth matching capacitor C314 , a fifth matching capacitor C307 , and a second matching inductor L302 .

[0097] The third matching capacitor C313 and the fourth matching capacitor C314 may be connected to the primary amplifier circuit 210 at one end and grounded at the other end to improve the matching effect and reliability. The fifth matching capacitor C307 may be connected to the primary amplifier circuit 210 at one end and connected to the secondary amplifier circuit 220 at the other end. The second matching inductor L302 may be connected to the fifth matching capacitor C307 at one end and grounded at the other end.

[0098] In some other embodiments, the secondary matching circuit 250 may only include the third matching capacitor C313 , the fifth matching capacitor C307 , and the second matching inductor L302 .

[0099] The third matching capacitor C313 may be connected to the primary amplifier circuit 210 at one end and grounded at the other end. The fifth matching capacitor C307 may be connected to the primary amplifier circuit 210 at one end and connected to the secondary amplifier circuit 220 at the other end. The second matching inductor L302 may be connected to the fifth matching capacitor C307 at one end and grounded at the other end.

[0100] Figure 4 yes Figure 2 Schematic circuit diagram of the final stage matching circuit 260, the filter circuit 230, and the coupling circuit 270. Figure 4 , the filter circuit 230 may include a filter inductor L316, filter capacitors C27 and C28, and a sixth matching capacitor C388.

[0101] The filter inductor L316 can be connected in series between the final matching circuit 260 and the output terminal of the power amplifier 130. The filter capacitor C27 and the filter capacitor C28 can be connected to both ends of the filter inductor L316 at one end and grounded at the other end. The sixth matching capacitor C388 can be connected in parallel to the filter inductor L316.

[0102] In some embodiments, the final matching circuit 260 may include a third matching inductor L308 and a fourth matching inductor L309. The third matching inductor L308 and the fourth matching inductor L309 may be connected in series between the secondary amplifier circuit 220 and the filter circuit 230 to ensure matching effect and reduce production costs.

[0103] In some embodiments, the power amplifier 130 may further include a DC blocking capacitor C308 and a DC blocking capacitor C338. The DC blocking capacitor C308 and the DC blocking capacitor C338 are respectively connected in series between the secondary matching circuit 250 and the secondary amplifying circuit 220, and between the final matching circuit 260 and the filter circuit 230 to filter out the DC signal in the circuit. The fourth matching inductor L309 and the DC blocking capacitor C338 simultaneously form a series resonant circuit, which can further filter out high-order harmonics to reduce interference with other electrical devices.

[0104] In some embodiments, the power amplifier 130 may further include a coupling circuit 270 . The coupling circuit 270 may be configured to detect the output power of the filter circuit 230 and / or the reflected power returning to the filter circuit 230 .

[0105] The coupling circuit 270 may include a detection resistor R337 and a detection resistor R343, which are respectively used to detect the output power and / or the reflected power. The detection resistor R337 and the detection resistor R343 may be respectively connected to the detection signal RF16 and the detection signal RF15, and the other ends thereof are grounded.

[0106] Figure 5 FIG. 1 is a schematic circuit diagram of a conversion comparison unit 180 according to an embodiment of the present invention. Figure 5 , in particular, the electromagnetic wave generating system may further include a conversion and comparison unit 180 .

[0107] The conversion comparison unit 180 can be configured to convert the electromagnetic wave signal outside the shielding feature into a safety bias signal, and be electrically connected to the power amplifier 130 to automatically adjust the power of the electromagnetic wave signal according to the electromagnetic leakage amount of the cavity 110, thereby stopping the electromagnetic wave generating system from working or reducing the electromagnetic wave energy outside the cavity 110 to a safe range.

[0108] One of the DC bias signal BIAS0 of the primary amplifier circuit 210 and the DC bias signal BIAS1 of the secondary amplifier circuit 220 may adopt a safety bias signal to automatically adjust the power of the electromagnetic wave signal according to the voltage value of the safety bias signal.

[0109] In some embodiments, the DC bias signal BIAS1 of the secondary amplifier circuit 220 may be a safety bias signal to stop the secondary amplifier circuit 220 from working or reduce the amplification ratio of the output signal of the primary amplifier circuit 210 .

[0110] The DC bias signal BIAS0 of the primary amplifying circuit 210 may adopt a regulated bias signal. The controller 160 may be configured to adjust the regulated bias signal according to at least one of a user instruction, characteristic parameters of the object to be processed 170 (such as temperature, weight, moisture content, etc.), and a reflected signal returned to the electromagnetic wave generating system, so as to reduce the problem of unstable electromagnetic wave signal jitter output by the power amplifier 130 when the electromagnetic wave leakage is within a safe range.

[0111] In some embodiments, the conversion comparison unit 180 may include a receiving conversion module and a voltage comparison module.

[0112] The receiving and converting module may be configured to receive an electromagnetic wave signal outside the shielding feature and convert the received electromagnetic wave signal into a receiving voltage signal; and

[0113] The voltage comparison module may be configured to compare the received voltage signal with at least one threshold voltage signal, and generate different safety bias signals according to the comparison result.

[0114] In some further embodiments, the receiving conversion module may include a receiving antenna T400, a detector tube D411, and a filter capacitor C401.

[0115] The receiving antenna T400 may be disposed outside the shielding feature to receive electromagnetic wave signals outside the shielding feature.

[0116] The detector tube D411 can be connected in series between the receiving antenna T400 and the voltage comparison module.

[0117] One end of the filter capacitor C401 can be connected in series between the detector tube D411 and the voltage comparison module, and the other end is grounded, so as to convert the electromagnetic wave signal received by the receiving antenna T400 into a DC receiving voltage signal together with the detector tube D411.

[0118] In some further embodiments, the receiving conversion module may be further provided with an attenuation resistor R401 according to the distance between the receiving antenna T400 and the cavity 110 to increase the service life of the voltage comparison module.

[0119] The attenuation resistor R401 may be connected in series between the detector tube D411 and the voltage comparison module. One end of the filter capacitor C401 may be connected in series between the attenuation resistor R401 and the voltage comparison module and the other end may be grounded.

[0120] In some further embodiments, the voltage comparison module may include a plurality of comparators and a plurality of diodes.

[0121] A plurality of comparators may be configured to compare the received voltage signal with a plurality of threshold voltage signals respectively.

[0122] A plurality of diodes may be respectively connected in series between the plurality of comparators and the power amplifier 130 to prevent current from flowing from the power amplifier 130 to the plurality of comparators.

[0123] In some further embodiments, the voltage comparison module may be configured to compare the received voltage signal with two threshold voltage signals. The two threshold voltage signals may be a first threshold voltage signal and a second threshold voltage signal, respectively.

[0124] The voltage comparison module may include a first comparator A1 and a second comparator A2. A diode D421 and a diode D422 may be connected in series between the first comparator A1 and the second comparator A2 and the power amplifier 130, respectively.

[0125] The inverting input terminals of the first comparator A1 and the second comparator A2 can be configured to receive a received voltage signal, and the non-inverting input terminals can be configured to receive a first threshold voltage signal and a second threshold voltage signal, respectively.

[0126] The voltage value of the second threshold voltage signal may be smaller than the voltage value of the first threshold voltage signal, so as to divide the electromagnetic leakage into three intervals.

[0127] When the voltage value of the received voltage signal is greater than the voltage value of the second threshold voltage signal and greater than the voltage value of the first threshold voltage signal (the electromagnetic leakage is high), the outputs of the first comparator A1 and the second comparator A2 are both low level, thereby causing the power amplifier 130 to have no signal output.

[0128] When the voltage value of the received voltage signal is greater than the voltage value of the second threshold voltage signal and less than the voltage value of the first threshold voltage signal (the electromagnetic leakage is medium), the output of the first comparator A1 is high level and the output of the second comparator A2 is low level, thereby causing the power amplifier 130 to output a low-power electromagnetic wave signal.

[0129] When the voltage value of the received voltage signal is less than the voltage value of the first threshold voltage signal and less than the voltage value of the second threshold voltage signal (electromagnetic leakage), the outputs of the first comparator A1 and the second comparator A2 are both high level, thereby causing the power amplifier 130 to output a high-power electromagnetic wave signal for normal heating.

[0130] In some further embodiments, the voltage comparison module may further include a transistor P401.

[0131] The base of the transistor P401 can be configured to be electrically connected to the output terminal of the second comparator A2, and the collector can be configured to be grounded.

[0132] A first voltage-dividing resistor R441 is connected in series between the emitter and the base of the transistor P401. One end of the first voltage-dividing resistor R441 close to the base is electrically connected to the power amplifier 130 through a second voltage-dividing resistor R442, so that when the transistor P401 is in the cut-off state, the input voltage of the emitter is used to form a safety bias signal, so as to facilitate factory configuration of the electromagnetic wave generating system.

[0133] In some further embodiments, the voltage comparison module may further include at least one voltage divider circuit to improve the safety of the electrical device and enable the power amplifier 130 to output an electromagnetic wave signal of appropriate power.

[0134] Each voltage divider circuit may include an upper voltage divider resistor and a lower voltage divider resistor. The lower voltage divider resistor is configured to have one end connected in series with the upper voltage divider resistor and the other end grounded, a voltage input terminal is formed at one end of the upper voltage divider resistor away from the lower voltage divider resistor, and a voltage output terminal is formed between the upper voltage divider resistor and the lower voltage divider resistor.

[0135] Specifically, an input terminal of the first comparator A1 for receiving the threshold voltage signal may be connected in series with a voltage divider circuit (an upper voltage divider resistor R411 and a lower voltage divider resistor R412).

[0136] An input terminal of the second comparator A2 for receiving a threshold voltage signal may be connected in series with a voltage divider circuit (an upper voltage divider resistor R421 and a lower voltage divider resistor R422).

[0137] A voltage divider circuit (an upper voltage divider resistor R431 and a lower voltage divider resistor R432 ) may be connected in series between the first comparator A1 and the diode D421 .

[0138] A voltage divider circuit (upper voltage divider resistor R451 and lower voltage divider resistor R452 ) may be connected in series between the diode D421 and the diode D422 and the power amplifier 130 .

[0139] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all these other variations or modifications.

Claims

1. An electromagnetic wave processing device, comprising: A cavity, used for placing the object to be processed and provided with a shielding feature; and An electromagnetic wave generating system is at least partially disposed in the cavity or connected to the cavity to process the object to be processed by electromagnetic waves; wherein the electromagnetic wave generating system comprises: A frequency source for generating an electromagnetic wave signal; A power amplifier, used to amplify the power of the electromagnetic wave signal; and The conversion and comparison unit is configured to convert the electromagnetic wave signal outside the shielding feature into a safety bias signal and is electrically connected to the power amplifier to automatically adjust the power of the electromagnetic wave signal according to the electromagnetic leakage amount of the cavity.

2. The electromagnetic wave processing device according to claim 1, wherein: The conversion comparison unit comprises: a receiving conversion module, configured to receive an electromagnetic wave signal outside the shielding feature and convert the received electromagnetic wave signal into a receiving voltage signal; and The voltage comparison module is configured to compare the received voltage signal with at least one threshold voltage signal and generate different safety bias signals according to the comparison result.

3. The electromagnetic wave processing device according to claim 2, wherein: The receiving conversion module comprises: A receiving antenna, disposed outside the shielding feature, for receiving electromagnetic wave signals outside the shielding feature; A detector tube connected in series between the receiving antenna and the voltage comparison module; and A filter capacitor has one end connected in series between the detector tube and the voltage comparison module and the other end grounded, and together with the detector tube converts the electromagnetic wave signal received by the receiving antenna into a receiving voltage signal.

4. The electromagnetic wave processing device according to claim 3, wherein: The receiving conversion module also includes: An attenuation resistor is connected in series between the detector tube and the voltage comparison module, and one end of the filter capacitor is connected in series between the attenuation resistor and the voltage comparison module.

5. The electromagnetic wave processing device according to claim 2, wherein: The at least one threshold voltage signal includes a first threshold voltage signal and a second threshold voltage signal, and the voltage comparison module includes: A first comparator, whose inverting input terminal is configured to receive the receiving voltage signal, and whose non-inverting input terminal is configured to receive the first threshold voltage signal; and The second comparator, the inverting input terminal is configured to receive the receiving voltage signal, and the non-inverting input terminal is configured to receive the second threshold voltage signal; wherein, A voltage value of the second threshold voltage signal is smaller than a voltage value of the first threshold voltage signal.

6. The electromagnetic wave processing device according to claim 5, wherein: The voltage comparison module also includes: The triode, the base is set to be electrically connected to the output end of the second comparator, and the collector is set to be grounded; wherein, A first voltage-dividing resistor is connected in series between the emitter and the base of the transistor, and one end of the first voltage-dividing resistor close to the base is electrically connected to the power amplifier through a second voltage-dividing resistor so that the input voltage of the emitter is used to form the safety bias signal when the transistor is in a cut-off state.

7. The electromagnetic wave processing device according to claim 2, wherein: The voltage comparison module comprises: A plurality of comparators, configured to compare the received voltage signal with a plurality of the threshold voltage signals respectively; and A plurality of diodes are configured to respectively block current from flowing from the power amplifier to the plurality of comparators.

8. The electromagnetic wave processing device according to claim 7, wherein: The voltage comparison module also includes: At least one voltage divider circuit, each of which includes an upper voltage divider resistor and a lower voltage divider resistor, wherein one end of the lower voltage divider resistor is connected in series with the upper voltage divider resistor and the other end is grounded; wherein, A voltage input terminal is formed at one end of the upper voltage-dividing resistor away from the lower voltage-dividing resistor, and a voltage output terminal is formed between the upper voltage-dividing resistor and the lower voltage-dividing resistor; and An input terminal of each comparator for receiving the threshold voltage signal is connected in series with a voltage divider circuit; and / or A voltage divider circuit is connected in series between at least one of the comparators and the corresponding diode; and / or A voltage divider circuit is connected in series between the multiple diodes and the power amplifier.

9. The electromagnetic wave processing device according to claim 1, wherein: The power amplifier comprises: A primary amplifying circuit, used to amplify the power of the electromagnetic wave signal; and The secondary amplifier circuit is connected to the output end of the primary amplifier circuit and is used to amplify the power of the output signal of the primary amplifier circuit; wherein, One of the primary amplifying circuit and the secondary amplifying circuit is configured to receive the safety bias signal to automatically adjust the power of the electromagnetic wave signal according to the voltage value of the safety bias signal.

10. The electromagnetic wave processing device according to claim 9, wherein: The secondary amplifier circuit is configured to receive the safety bias signal so as to stop the secondary amplifier circuit from working or reduce the amplification ratio of the output signal of the primary amplifier circuit; and The primary amplifying circuit is configured to receive a regulating bias signal, and the regulating bias signal is configured to be adjusted according to at least one of a user instruction, a characteristic parameter of the object to be processed, and a reflected signal returned to the electromagnetic wave generating system.

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