Electromagnetic wave processing device

Abstract

This invention provides an electromagnetic wave processing device. The device includes a cavity and an electromagnetic wave generating system. The cavity is used to hold the object to be processed and is equipped with shielding features. The electromagnetic wave generating system is at least partially disposed within or extends into the cavity to process the object to be processed using electromagnetic waves. The electromagnetic wave generating system includes a frequency source, a power amplifier, and a conversion and comparison unit. The conversion and comparison unit is configured to convert the electromagnetic wave signal outside the shielding features into a safe bias signal and is electrically connected to the power amplifier. This automatically adjusts the power of the electromagnetic wave signal based on the electromagnetic leakage of the cavity, thereby stopping the electromagnetic wave generating system or reducing the electromagnetic wave energy outside the cavity to a safe range. This device is particularly suitable for refrigerators.

Description

Technical Field

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

[0002] During the freezing process, the quality of food is preserved; however, frozen food needs to be thawed before processing or consumption. To facilitate freezing and thawing for users, current technology generally uses electromagnetic waves to thaw food, and the electromagnetic wave generating system is placed in the refrigerator.

[0003] However, the electromagnetic waves generated by the electromagnetic wave generating system can easily affect or interfere with the food stored at low temperatures and the electrical components placed around it. Although setting electromagnetic shielding features in the cavity can effectively reduce electromagnetic wave leakage, the shielding features will degrade in performance after long-term use, and too much electromagnetic wave will leak into the vicinity of the cavity, resulting in the above-mentioned serious effects or interference. Summary of the Invention

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

[0005] A further objective of this invention is to improve the safety of electromagnetic wave processing devices.

[0006] Another further objective of this invention is to reduce the manufacturing cost of electromagnetic wave processing devices.

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

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

[0009] An electromagnetic wave generating system, at least partially disposed within or accessible to the cavity, for processing the object to be processed using electromagnetic waves; wherein the electromagnetic wave generating system includes:

[0010] A frequency source is used to generate electromagnetic wave signals.

[0011] A power amplifier for amplifying 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 safe bias signal and electrically connect it to the power amplifier to automatically adjust the power of the electromagnetic wave signal according to the electromagnetic leakage of the cavity.

[0013] Optionally, the conversion comparison unit includes:

[0014] The receiving and conversion module is configured to receive electromagnetic wave signals from the outside of the shielding feature and convert the received electromagnetic wave signals into a received 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 based on the comparison result.

[0016] Optionally, the receiving and conversion module includes:

[0017] A receiving antenna is disposed on the outside of the shielding feature and is used to receive electromagnetic wave signals from the outside of the shielding feature.

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

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

[0020] Optionally, the receiving and 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, with its inverting input configured to receive the received voltage signal and its non-inverting input configured to receive the first threshold voltage signal; and

[0024] The second comparator has its inverting input configured to receive the received voltage signal, and its non-inverting input configured to receive the second threshold voltage signal; wherein...

[0025] The voltage value of the second threshold voltage signal is less than the voltage value of the first threshold voltage signal.

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

[0027] The transistor has its base electrically connected to the output of the second comparator, and its collector grounded.

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

[0029] Optionally, the voltage comparison module includes:

[0030] Multiple comparators are configured to compare the received voltage signal with each of the multiple threshold voltage signals; and

[0031] Multiple diodes are configured to respectively block current from flowing from the power amplifier to the multiple comparators.

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

[0033] At least one voltage divider circuit, each voltage divider circuit including an upper voltage divider resistor and a lower voltage divider resistor, wherein the lower voltage divider resistor is configured such that one end is connected in series with the upper voltage divider resistor and the other end is grounded; wherein...

[0034] The end of the upper voltage divider resistor furthest from the lower voltage divider resistor forms a voltage input terminal, and a voltage output terminal is formed between the upper and lower voltage divider resistors; and

[0035] Each of the comparators has a voltage divider circuit connected in series at its input terminal for receiving the threshold voltage signal; and / or

[0036] At least one of the comparators is connected in series with a corresponding diode via a voltage divider circuit; and / or

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

[0038] Optionally, the power amplifier includes:

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

[0040] The secondary amplifier circuit is connected to the output terminal 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 amplifier circuit and the secondary amplifier circuit is configured to receive the safety bias signal to automatically adjust the power of the electromagnetic wave signal according to the magnitude of 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 operating or reduce the amplification ratio of the output signal of the primary amplifier circuit; and

[0043] The primary amplifier circuit is configured to receive a control bias signal, which is adjusted according to at least one of the user instruction, the characteristic parameters of the object to be processed, and the reflected signal returned by 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 safe bias signal through a conversion and comparison unit and transmits it to the power amplifier. This enables the power amplifier to automatically adjust the power of the electromagnetic wave signal according to the electromagnetic leakage of the cavity, thereby stopping the electromagnetic wave generation system from working or reducing the electromagnetic wave energy outside the cavity to a safe range. It 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, making it convenient to configure the electromagnetic wave power at the factory when the electromagnetic wave leakage is within a safe range. Moreover, the structure is simple and reduces the production cost of the processing device.

[0046] Furthermore, this invention enables the primary amplifier circuit to receive a control bias signal and the secondary amplifier circuit to receive a safety bias signal. This not only safely and effectively reduces the power of the electromagnetic wave signal when there is a large amount of electromagnetic wave leakage, but also reduces the problem of unstable electromagnetic wave signal output by the power amplifier when the electromagnetic wave leakage is within a safe range, thereby achieving precise and efficient processing of the object to be processed.

[0047] The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0048] The following sections will describe some specific embodiments of the invention in detail by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or portions. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

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

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

[0051] Figure 3 yes Figure 2 Schematic circuit diagrams of primary amplifier circuit, secondary amplifier circuit and corresponding matching circuit;

[0052] Figure 4 yes Figure 2 Schematic circuit diagram of the final stage matching circuit, filtering circuit, and coupling circuit;

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

[0054] Figure 1 This is a schematic structural diagram of an electromagnetic wave processing apparatus according to an embodiment of the present invention. See also... 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 contain and process the object 170, and is provided with shielding features to reduce electromagnetic wave leakage.

[0056] An electromagnetic wave generating system may be at least partially disposed within or accessible to the cavity 110 to process the object 170 by means of electromagnetic waves. Exemplarily, the processing of the object 170 according to the present invention is heating.

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

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

[0059] The radiating antenna 140 can 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 can be configured to be electrically connected to the frequency source 120 and the power amplifier 130 to provide power to the frequency source 120 and the power amplifier 130.

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

[0062] Specifically, the primary amplifier circuit 210 can be used to amplify the power of electromagnetic wave signals. The secondary amplifier circuit 220 can be connected to the output terminal of the primary amplifier circuit 210 to amplify the power of the output signal of the primary amplifier circuit 210.

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

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

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

[0066] The final stage matching circuit 260 can be connected in series between the secondary amplifier circuit 220 and the filter circuit 230, and is configured to achieve impedance matching between the filter circuit 230, the transmission line connected to the output of the power amplifier 130, and the output signal of the secondary amplifier 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 and can flexibly adjust the frequency for different types and states of the object to be processed 170, thereby improving the heating effect, but also reduces signal interference to other electrical components, improves the output power of each amplification circuit and filter circuit 230, and reduces reflections back to the upper stage circuit, thereby improving the output power of the power amplifier 130 and the service life of the amplification circuit (especially the transistor).

[0068] Figure 3 yes Figure 2 A 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 China, "RF" in "" indicates "electromagnetic wave input signal"; "RF" out "" indicates "electromagnetic wave output signal". See also Figure 3 The primary amplifier circuit 210 and the secondary amplifier circuit 220 each include a transistor, a bias section, and a power supply section.

[0069] The bias section can be connected to the gate of the transistor to generate a DC bias signal BIAS0 to the transistor, which then amplifies the electromagnetic wave signal.

[0070] The power supply section can be connected to the drain of the transistor to supply power to the transistor.

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

[0072] The bias section 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] Multiple first decoupling capacitors in the primary amplifier circuit 210 can be connected at one end to the DC bias signal BIAS0 and at the other end to ground, in order to reduce the high frequency in the DC bias signal BIAS0.

[0074] In the illustrated embodiment, the primary amplifier circuit 210 may include capacitors C320, C322, and C324 as first decoupling capacitors. Capacitors C320, C322, and C324 may have different orders of magnitude, with capacitance values ​​ranging from 10pF to 100nF, to improve filtering performance.

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

[0076] The isolation resistor R306 can 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 section of the primary amplifier circuit 210 may include multiple second decoupling capacitors and a second choke inductor L301.

[0078] Multiple second decoupling capacitors in the primary amplifier circuit 210 can be connected at one end to the power supply voltage signal PA and at the other end to ground, in order to reduce the high frequency in the power supply voltage signal PA.

[0079] In the illustrated embodiment, the primary amplifier circuit 210 may include multiple second decoupling capacitors, including capacitors C318, C319, and C321. Capacitors C318, C319, and C321 may have different orders of magnitude, with capacitance values ​​ranging from 10pF to 100nF, to improve the filtering effect.

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

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

[0082] The bias 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] Multiple first decoupling capacitors in the secondary amplifier circuit 220 can be connected at one end to the DC bias signal BIAS1 and at the other end to ground, in order to reduce the high frequency in the DC bias signal BIAS1.

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

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

[0086] The isolation resistor R310 can 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 section of the secondary amplifier circuit 220 may include multiple second decoupling capacitors and a second choke inductor L307.

[0088] Multiple second decoupling capacitors in the secondary amplifier circuit 220 can be connected at one end to the power supply voltage signal PA and at the other end to ground, in order to reduce the high frequency in the power supply voltage signal PA.

[0089] In the illustrated embodiment, the secondary amplifier circuit 220 may include multiple second decoupling capacitors, including capacitors C325, C326, and C327. Capacitors C325, C326, and C327 may have different orders of magnitude, with capacitance values ​​ranging from 10pF to 100nF, to improve the filtering effect.

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

[0091] The secondary amplifier circuit 220 may also include a third decoupling capacitor C335. One end of the third decoupling capacitor C335 is connected between the first choke inductor L306 and the isolation resistor R310, and the other end is grounded to reduce signal strength and ensure 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 at one end to the first matching capacitor C306 and the other end to ground. The first matching inductor L300 can be connected at one end to the first matching capacitor C306 and the other end to the primary amplifier circuit 210.

[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 can be connected at one end to the primary amplifier circuit 210 and the other end to ground to improve the matching effect and reliability. The fifth matching capacitor C307 can be connected at one end to the primary amplifier circuit 210 and the other end to the secondary amplifier circuit 220. The second matching inductor L302 can be connected at one end to the fifth matching capacitor C307 and the other end to ground.

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

[0099] The third matching capacitor C313 can be connected to the primary amplifier circuit 210 at one end and grounded at the other end. The fifth matching capacitor C307 can be connected to the primary amplifier circuit 210 at one end and to the secondary amplifier circuit 220 at the other end. The second matching inductor L302 can 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 intermediate-stage matching circuit 260, filter circuit 230, and coupling circuit 270. See also Figure 4 The filter circuit 230 may include a filter inductor L316, a filter capacitor C27 and a filter capacitor C28, and a sixth matching capacitor C388.

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

[0102] In some embodiments, the final stage 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 capacitors C308 and C338 are connected in series between the secondary matching circuit 250 and the secondary amplifier circuit 220, and between the final matching circuit 260 and the filter circuit 230, respectively, to filter out DC signals in the circuit. The fourth matching inductor L309 and the DC blocking capacitor C338 also constitute a series resonant circuit, which can further filter out higher harmonics to reduce interference to other electrical components.

[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 of the return filter circuit 230.

[0105] The coupling circuit 270 may include sensing resistors R337 and R343, used to detect output power and / or reflected power, respectively. Sensing resistors R337 and R343 may be connected to detection signal RF16 and detection signal RF15, respectively, and their other ends are grounded.

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

[0107] The conversion and comparison unit 180 can be configured to convert the electromagnetic wave signal outside the shielding feature into a safe bias signal and electrically connect it to the power amplifier 130 to automatically adjust the power of the electromagnetic wave signal according to the electromagnetic leakage of the cavity 110, thereby causing the electromagnetic wave generation system to stop 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 can be a safe bias signal, so as to automatically adjust the power of the electromagnetic wave signal according to the magnitude of the voltage value of the safe bias signal.

[0109] In some embodiments, the DC bias signal BIAS1 of the secondary amplifier circuit 220 may be a safe bias signal, so as 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 amplifier circuit 210 can be a modulated bias signal. The controller 160 can be configured to adjust the modulated bias signal according to at least one of the user instructions, characteristic parameters of the object to be processed 170 (e.g., temperature, weight, moisture content, etc.), and the reflected signal from the electromagnetic wave generation system, in order to mitigate the problem of unstable electromagnetic wave signal output by the power amplifier 130 while keeping electromagnetic wave leakage 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 conversion module can be configured to receive electromagnetic wave signals from outside the shielding feature and convert the received electromagnetic wave signals into received voltage signals; and

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

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

[0115] The receiving antenna T400 can be set on the outside of the shielding feature to receive electromagnetic wave signals from the outside of the shielding feature.

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

[0117] The filter capacitor C401 can be connected in series between the detector tube D411 and the voltage comparison module at one end, and the other end can be grounded, so that together with the detector tube D411, the electromagnetic wave signal received by the receiving antenna T400 can be converted into a DC receiving voltage signal.

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

[0119] The attenuation resistor R401 can be connected in series between the detector tube D411 and the voltage comparison module. The filter capacitor C401 can be connected in series at one end between the attenuation resistor R401 and the voltage comparison module, and the other end can be grounded.

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

[0121] Multiple comparators can be configured to compare the received voltage signal with multiple threshold voltage signals respectively.

[0122] Multiple diodes can be configured to be connected in series between multiple comparators and power amplifier 130 to prevent current from flowing from power amplifier 130 to multiple 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. Diodes D421 and D422 may be connected in series between the first comparator A1, the second comparator A2, and the power amplifier 130, respectively.

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

[0126] The voltage value of the second threshold voltage signal can be less 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, thus 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 (moderate electromagnetic leakage), the output of the first comparator A1 is high and the output of the second comparator A2 is low, 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 disclosure), 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 also include a transistor P401.

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

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

[0133] In some further embodiments, the voltage comparison module may also include at least one voltage divider circuit to improve the safety of electrical components 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 such that one end is connected in series with the upper voltage divider resistor and the other end is grounded. The end of the upper voltage divider resistor furthest from the lower voltage divider resistor forms a voltage input terminal, and a voltage output terminal is formed between the upper and lower voltage divider resistors.

[0135] Specifically, the input terminal of the first comparator A1, which is used to receive the threshold voltage signal, can be connected in series with a voltage divider circuit (upper voltage divider resistor R411 and lower voltage divider resistor R412).

[0136] The input terminal of the second comparator A2, which is used to receive the threshold voltage signal, can be connected in series with a voltage divider circuit (upper voltage divider resistor R421 and lower voltage divider resistor R422).

[0137] A voltage divider circuit (upper voltage divider resistor R431 and lower voltage divider resistor R432) can 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) can be connected in series between diodes D421 and D422 and power amplifier 130.

[0139] Therefore, those skilled in the art should recognize that although numerous exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Thus, the scope of the present invention should be understood and construed as covering all such other variations or modifications.

Claims

1. An electromagnetic wave processing device, comprising: The cavity is used to place the object to be processed and is equipped with shielding features; and An electromagnetic wave generating system, at least partially disposed within or accessible to the cavity, for processing the object to be processed using electromagnetic waves; wherein the electromagnetic wave generating system includes: A frequency source is used to generate electromagnetic wave signals. A power amplifier for amplifying 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 safe bias signal and electrically connect it to the power amplifier to automatically adjust the power of the electromagnetic wave signal according to the electromagnetic leakage of the cavity.

2. The electromagnetic wave processing device according to claim 1, wherein, The conversion comparison unit includes: The receiving and conversion module is configured to receive electromagnetic wave signals from the outside of the shielding feature and convert the received electromagnetic wave signals into a received 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 based on the comparison result.

3. The electromagnetic wave processing device according to claim 2, wherein, The receiving and conversion module includes: A receiving antenna is disposed on the outside of the shielding feature and is used to receive electromagnetic wave signals from the outside of the shielding feature. A detector tube is connected in series between the receiving antenna and the voltage comparison module; and A filter capacitor, with one end connected in series between the detector tube and the voltage comparison module, and the other end set to ground, together with the detector tube, converts the electromagnetic wave signal received by the receiving antenna into a received voltage signal.

4. The electromagnetic wave processing device according to claim 3, wherein, The receiving and conversion module further 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, with its inverting input configured to receive the received voltage signal and its non-inverting input configured to receive the first threshold voltage signal; and The second comparator has its inverting input configured to receive the received voltage signal, and its non-inverting input configured to receive the second threshold voltage signal; wherein... The voltage value of the second threshold voltage signal is less than the voltage value of the first threshold voltage signal.

6. The electromagnetic wave processing apparatus according to claim 5, wherein, The voltage comparison module further includes: The transistor has its base electrically connected to the output of the second comparator, and its collector grounded. A first voltage divider resistor is connected in series between the emitter and the base of the transistor. The end of the first voltage divider resistor closest to the base is electrically connected to the power amplifier through a second voltage divider resistor, so that the input voltage of the emitter is used to form the safety bias signal when the transistor is in the off state.

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

8. The electromagnetic wave processing apparatus according to claim 7, wherein, The voltage comparison module further includes: At least one voltage divider circuit, each voltage divider circuit including an upper voltage divider resistor and a lower voltage divider resistor, wherein the lower voltage divider resistor is configured such that one end is connected in series with the upper voltage divider resistor and the other end is grounded; wherein... The end of the upper voltage divider resistor furthest from the lower voltage divider resistor forms a voltage input terminal, and a voltage output terminal is formed between the upper and lower voltage divider resistors; and Each of the comparators has a voltage divider circuit connected in series at its input terminal for receiving the threshold voltage signal; and / or At least one of the comparators is connected in series with a corresponding diode via a voltage divider circuit; and / or A voltage divider circuit is connected in series between the plurality of diodes and the power amplifier.

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

10. The electromagnetic wave processing apparatus according to claim 9, wherein, The secondary amplifier circuit is configured to receive the safety bias signal, thereby stopping the secondary amplifier circuit from operating or reducing the amplification ratio of the output signal of the primary amplifier circuit; and The primary amplifier circuit is configured to receive a control bias signal, which is adjusted according to at least one of the user instruction, the characteristic parameters of the object to be processed, and the reflected signal returned by the electromagnetic wave generating system.

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