Radio frequency unfreezing circuit and refrigerator

Abstract

The invention discloses a radio frequency unfreezing circuit and a refrigerator. The radio frequency unfreezing circuit is used for the refrigerator and comprises a signal generation module, a radio frequency power amplification module, a detection module, a control module and a radio frequency antenna. The signal generation module is used for outputting a radio frequency signal; the radio frequency power amplification module is connected with the signal generation module and is used for generating a radio frequency amplification signal according to the radio frequency signal; the radio-frequency antenna is connected with the radio-frequency power amplification module and is used for transmitting electromagnetic waves according to the radio-frequency amplification signal; the detection module is connected with the radio frequency power amplification module and is used for detecting the state of the radio frequency power amplification module; and the control module is connected with the detection module and the signal generation module and is used for sending a control signal to the signal generation module so as to adjust the duty ratio of the radio frequency signal in the continuous signal. When the detection device detects that the state of the radio frequency power amplification module is abnormal, the control device sends a control signal to the signal generation module, the duty ratio of the signal is adjusted in real time, and the power and temperature of the radio frequency power amplification module are adjusted to protect the radio frequency circuit.

Description

Technical Field

[0001] This application relates to the field of household appliance technology, and in particular to a radio frequency defrosting circuit and a refrigerator. Background Technology

[0002] In related technologies, a defrosting device can be placed in the refrigerator's storage compartment to defrost the frozen components. However, in actual use in a refrigerator, the power components of the defrosting device may burn out due to overheating, excessive power, etc. Summary of the Invention

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application provides a radio frequency defrosting circuit and a refrigerator.

[0004] The radio frequency (RF) defrosting circuit of this application is used in a refrigerator. The RF defrosting circuit includes a signal generation module, an RF power amplification module, a detection module, a control module, and an RF antenna. The signal generation module is used to output a continuous signal, which includes an RF signal. The RF power amplification module is connected to the signal generation module and is used to generate an amplified RF signal based on the RF signal in the continuous signal. The RF antenna is connected to the RF power amplification module and is used to emit electromagnetic waves based on the amplified RF signal. The detection module is connected to the RF power amplification module and is used to detect the state of the RF power amplification module. The control module is connected to the detection module and the signal generation module and is used to send a control signal to the signal generation module when the state of the RF power amplification module is abnormal, so as to adjust the duty cycle of the RF signal in the continuous signal.

[0005] In some embodiments, the detection module includes a temperature detection unit for detecting the current temperature of the radio frequency power amplifier module, and the control module for sending the control signal to the signal generation module when the current temperature is greater than a preset temperature, so as to reduce the duty cycle of the radio frequency signal in the continuous signal.

[0006] In some embodiments, the control signal includes a plurality of first control sub-signals. The control module has a preset temperature-duty cycle mapping table. The control module can determine a first target control sub-signal based on the temperature-duty cycle mapping table and the current temperature. The first target control sub-signal is one of the plurality of first control sub-signals. The first target control sub-signal is sent to the signal generation module so that the signal generation module adjusts the duty cycle of the radio frequency signal in the continuous signal according to the first target control sub-signal.

[0007] In some embodiments, when the temperature is greater than the preset temperature, the duty cycle of the radio frequency signal in the continuous signal is 10%.

[0008] In some embodiments, the detection module includes a power detection unit, the temperature detection unit is used to detect the output power of the radio frequency power amplifier module, and the control module is used to send a control signal to the signal generation module when the output power is greater than a preset power, so as to reduce the duty cycle of the radio frequency signal in the continuous signal.

[0009] In some embodiments, the control signal includes a plurality of second control sub-signals. The control module has a preset power-duty cycle mapping table. The control module can determine a second target control sub-signal based on the power-duty cycle mapping table and the output power. The second target control sub-signal is one of the plurality of second control sub-signals. The control module sends the second target control sub-signal to the signal generation module so that the signal generation module adjusts the duty cycle of the radio frequency signal in the continuous signal according to the second target control sub-signal.

[0010] In some embodiments, the radio frequency defrosting circuit further includes an automatic gain control unit, and the signal generation module is connected to the radio frequency power amplifier module through the automatic gain control unit to send the continuous signal to the radio frequency power amplifier module; the control module is also connected to the automatic gain control unit, and the control module is also used to send a control signal to the automatic gain control unit to adjust the continuous signal when the state of the radio frequency power amplifier module is abnormal.

[0011] In some embodiments, the radio frequency defrosting circuit further includes a cooling fan, and the control module is connected to the cooling fan. The control module is also used to drive the cooling fan to cool the radio frequency power amplifier module when the current temperature is greater than a preset temperature.

[0012] In some embodiments, the radio frequency defrosting circuit has a rated power of 200 watts.

[0013] This application also provides a refrigerator, which includes a radio frequency defrosting circuit that implements any one of the above embodiments.

[0014] In the radio frequency defrosting circuit of this application, when the detection device detects an abnormal state of the radio frequency power amplifier module, the control device sends a control signal to the signal generation module to adjust the signal duty cycle in real time and regulate the power and temperature of the radio frequency power amplifier module to protect the radio frequency circuit.

[0015] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0017] Figure 1 This is one of the structural schematic diagrams of the radio frequency defrosting circuit according to an embodiment of this application;

[0018] Figure 2 This is the second schematic diagram of the radio frequency defrosting circuit according to an embodiment of this application.

[0019] Main component reference numerals:

[0020] The radio frequency defrosting circuit 100, signal generation module 10, radio frequency power amplification module 20, detection module 30, radio frequency antenna 40, control module 50, and automatic gain control unit 60 are included. Detailed Implementation

[0021] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0022] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0026] Please see Figure 1This application provides an RF defrosting circuit 100 for a refrigerator. The RF defrosting circuit 100 includes a signal generation module 10, an RF power amplification module 20, a detection module 30, a control module 50, and an RF antenna 40. The signal generation module 10 outputs a continuous signal, which includes an RF signal. The RF power amplification module 20 is connected to the signal generation module 10 and generates an RF amplified signal based on the RF signal in the continuous signal. The RF antenna 40 is connected to the RF power amplification module 20 and transmits electromagnetic waves based on the RF amplified signal. The detection module 30 is connected to the RF power amplification module 20 and detects the state of the RF power amplification module 20. The control module 50 is connected to the detection module 30 and the signal generation module 10 and sends a control signal to the signal generation module 10 when the state of the RF power amplification module 20 is abnormal, so as to adjust the duty cycle of the RF signal in the continuous signal.

[0027] In the radio frequency defrosting circuit 100 of this application, when the detection device detects an abnormal state of the radio frequency power amplifier module 20, the control device sends a control signal to the signal generation module 10 to adjust the duty cycle of the radio frequency signal in the continuous signal in real time, and adjust the power and temperature of the radio frequency power amplifier module 20 to protect the radio frequency circuit.

[0028] Specifically, the signal generation module 10 of the radio frequency defrosting circuit 100 is the key component for generating radio frequency signals. The signal generation module 10 can generate continuous signals, which include invalid signals and valid signals, with the valid signals being radio frequency signals. By utilizing the heating mechanism of the radio frequency signals and their effect on the ice crystals inside the food, rapid and uniform defrosting of frozen foods can be achieved.

[0029] Radio frequency (RF) signals are a type of high-frequency electromagnetic wave. When they penetrate food materials, they interact with polar molecules (such as water molecules) within the food. These polar molecules vibrate and rotate rapidly under the influence of the RF electric field, generating heat. Due to the strong penetrating power of RF signals, they can evenly heat the interior of the food, not just the surface. In frozen foods, ice crystals are a major component. The heating effect of RF signals gradually melts the ice crystals while preserving the food's internal moisture and nutrients. Compared to traditional thawing methods, RF thawing melts ice crystals more quickly and reduces juice loss and quality degradation after thawing.

[0030] Depending on the defrosting requirements, the signal generation module 10 may need to be able to adjust the waveform of the continuous signal, such as a sine wave or a square wave, to adapt to different defrosting scenarios. For example, when defrosting large pieces of meat, a square wave signal may be selected and the power and frequency increased to obtain a faster defrosting speed; while when defrosting thin slices of vegetables, a sine wave signal may be selected and the power and frequency reduced to avoid overheating.

[0031] The signal generation device can use a transmitter to output radio frequency signals, such as the STX620M. The STX620M transmitter integrates a phase-locked loop and a microcontroller, with an operating frequency range of approximately 300MHz-500MHz. The STX620M transmitter includes a crystal oscillator (XOSC), a phase detector (PD), a charge pump (CP), a low-pass filter (LPF), a voltage-controlled oscillator (VCO), and a power amplifier (PA).

[0032] In the RF defrosting circuit 100, the XOSC is used to generate the reference clock signal required by the system, ensuring that the entire system can operate synchronously. The phase detector, along with the charge pump, low-pass filter, and voltage-controlled oscillator, forms a phase-locked loop (PLL) for precise frequency and phase control. The power amplifier amplifies the power of the RF signal.

[0033] The radio frequency power amplifier module 20 is connected to the signal generation module 10 and is responsible for amplifying the radio frequency signal output by the signal generation module 10 to generate a radio frequency amplified signal with sufficient power. These amplified radio frequency signals will drive the radio frequency antenna 40 to emit electromagnetic waves to heat and defrost frozen food.

[0034] The RF power amplifier module 20 can be composed of a multi-stage power amplifier combination, with each PA stage undertaking a specific amplification task, collectively achieving efficient and stable power amplification. Through multi-stage amplification, the gain of the RF signal can be significantly improved, giving the signal stronger penetration and anti-interference capabilities during transmission. Furthermore, by optimizing the design and operating point of each PA stage and employing linearization techniques (such as predistortion and feedback), the linearity of the entire RF power amplifier module 20 can be improved, reducing signal distortion.

[0035] The detection module 30 is connected to the RF power amplifier module 20 and is responsible for monitoring the operating status of the RF power amplifier module 20 in real time, including key parameters such as temperature, current, and voltage. Once an abnormal state (such as overheating or overcurrent) is detected, the detection module 30 will send an alarm signal to the control module 50. The detection module 30 is equipped with high-precision sensors to accurately measure various parameters of the RF power amplifier module 20.

[0036] The control module 50 connects the detection module 30 and the signal generation module 10, and is responsible for making decisions and controlling based on the alarm signals sent by the detection module 30. When the state of the RF power amplifier module 20 is abnormal (such as overheating, overpowering, etc.), the control module 50 will send a control signal to the signal generation module 10 to adjust the duty cycle of the RF signal in the continuous signal, thereby reducing the load and temperature of the RF power amplifier module 20.

[0037] The radio frequency antenna 40 is connected to the radio frequency power amplifier module 20, which is responsible for converting the radio frequency amplified signal into electromagnetic waves and radiating them onto the frozen food. The radio frequency antenna 40 uses the penetration and heating effect of electromagnetic waves to gradually melt the ice crystals inside the frozen food, thereby achieving the purpose of thawing.

[0038] In summary, the various modules in the radio frequency defrosting circuit 100 cooperate and work together to achieve rapid and efficient defrosting of frozen foods.

[0039] In some embodiments, the detection module 30 includes a temperature detection unit for detecting the current temperature of the radio frequency power amplifier module 20, and the control module 50 for sending a control signal to the signal generation module 10 when the current temperature is greater than a preset temperature, so as to reduce the duty cycle of the radio frequency signal in the continuous signal.

[0040] For example, if the preset temperature is 70 degrees Celsius, the duty cycle of the radio frequency signal in the continuous signal is 50% at 60 degrees Celsius. When the temperature detection unit detects that the temperature has risen to 75 degrees Celsius, the duty cycle of the radio frequency signal in the continuous signal is reduced to 10% to reduce heat generation.

[0041] Specifically, the temperature detection unit is responsible for monitoring the current temperature of the RF power amplifier module 20 in real time. The temperature detection unit can be implemented using a temperature sensor embedded near the RF power amplifier module 20, such as a thermistor, thermocouple, or semiconductor temperature sensor.

[0042] The RF power amplifier module 20 generates a significant amount of heat during operation, especially at high power output. If this heat cannot be effectively dissipated, the temperature of the RF power amplifier module 20 will rise rapidly, potentially exceeding its maximum permissible operating temperature, leading to performance degradation, reduced efficiency, or even permanent damage.

[0043] The control module 50 receives temperature data from the temperature detection unit and compares it with a preset temperature threshold. If the current temperature exceeds the preset temperature threshold, the control module 50 sends a control signal to the signal generation module 10 to reduce the duty cycle of the radio frequency signal in the continuous signal. The duty cycle refers to the proportion of time that a continuous signal is at a high level (i.e., an effective signal) within one cycle. Reducing the duty cycle means reducing the operating time of the signal generation module 10 in a high-power state, thereby indirectly reducing the average power of the corresponding radio frequency power amplifier module 20 within the cycle, reducing heat generation, and helping to lower the temperature of the radio frequency power amplifier module 20.

[0044] The temperature detection unit and control module 50 together constitute an important protection link in the radio frequency defrosting circuit 100. By monitoring and adjusting the duty cycle of the radio frequency signal in the continuous signal in real time, the radio frequency power amplifier module 20 is effectively prevented from being damaged due to overheating, thus ensuring the normal operation of the entire radio frequency defrosting circuit 100.

[0045] In some implementations, the control signal includes multiple first control sub-signals. The control module 50 has a preset temperature-duty cycle mapping table. The control module 50 can determine the first target control sub-signal according to the temperature-duty cycle mapping table and the current temperature. The first target control sub-signal is one of the multiple first control sub-signals. The first target control sub-signal is sent to the signal generation module 10 so that the signal generation module 10 adjusts the duty cycle of the radio frequency signal in the continuous signal according to the first target control sub-signal.

[0046] Specifically, the control module 50 adjusts the duty cycle of the radio frequency signal in the continuous signal in a more refined manner to adapt to different levels of temperature rise. This control method is achieved by pre-setting a "temperature-duty cycle mapping table", which defines the mapping relationship between different temperature ranges and corresponding duty cycle adjustment strategies.

[0047] The temperature-duty cycle mapping table is a data structure stored in the memory of the control module 50. It lists multiple temperature thresholds and the corresponding duty cycle adjustment strategy (i.e., the first control sub-signal) for each threshold. These strategies may include the specific value of reducing the duty cycle, the rate of duty cycle adjustment, etc.

[0048] Control methods include:

[0049] Temperature detection: The temperature detection unit continuously monitors the current temperature of the RF power amplifier module 20 and sends the temperature data to the control module 50.

[0050] Temperature comparison: The control module 50 compares the received temperature data with the temperature thresholds in the temperature-duty cycle mapping table to determine which range the current temperature falls into.

[0051] Once the duty cycle is determined, the control module 50 searches for the corresponding first target control sub-signal in the mapping table based on the comparison results. This sub-signal specifies the duty cycle adjustment strategy to be adopted at the current temperature.

[0052] Signal transmission: Control module 50 sends the first target control sub-signal to signal generation module 10.

[0053] Duty cycle adjustment: The signal generation module 10 adjusts the duty cycle of the radio frequency signal in the continuous signal according to the received first target control sub-signal, so as to reduce the heat generation of the radio frequency power amplifier module 20.

[0054] By using a preset mapping table, the RF defrosting circuit 100 can flexibly adjust the duty cycle according to different temperature conditions, thereby better controlling the temperature of the RF power amplifier module 20.

[0055] In some implementations, when the temperature is higher than a preset temperature, the duty cycle of the radio frequency signal in the continuous signal is 10%.

[0056] Specifically, for example, if the temperature detection unit of the detection module 30 detects that the current temperature of the RF power amplifier module 20 is 75 degrees Celsius, which is higher than the preset temperature of 70 degrees Celsius, it means that the RF power amplifier module 20 is at risk of being damaged due to overheating. In response, the control module 50 looks up the corresponding first target control sub-signal in the mapping table. This sub-signal specifies the duty cycle adjustment strategy to be used in the temperature range of 70 to 75 degrees Celsius, i.e., adjusting the duty cycle from 50% to 10%, and sends it to the signal generation module 10. The signal generation module 10 then adjusts the duty cycle of the RF signal in the continuous signal to 10%, meaning that the RF signal is only at a high level for 10% of the time in each cycle of the RF signal. Correspondingly, the power of the RF power amplifier module 20 will also decrease, reducing heat generation and thus lowering the temperature below the preset temperature, preventing damage from overheating.

[0057] In some embodiments, the detection module 30 includes a power detection unit for detecting the output power of the RF power amplifier module 20, and the control module 50 for sending a control signal to the signal generation module 10 when the output power is greater than a preset power, so as to reduce the duty cycle of the RF signal in the continuous signal.

[0058] Specifically, the main function of the power detection unit is to detect the output power of the RF power amplifier module 20 in real time. The power detection unit can measure the signal strength at the output of the RF power amplifier module 20 by using various power detection devices, such as power meters, couplers, and detectors.

[0059] The output power of the RF power amplifier module 20 is one of the key indicators for evaluating its operating status and performance. Excessive output power may cause the RF power amplifier module 20 to overheat, be damaged, or affect the overall performance of the system. Therefore, real-time monitoring of the output power is crucial for protecting the RF power amplifier module 20 and ensuring stable system operation.

[0060] When the power detection unit of the detection module 30 detects that the RF power amplifier module 20 is too high, the control module 50 will send a control signal to the signal generation module 10 to reduce the output power of the RF power amplifier module 20 by reducing the duty cycle of the RF signal in the continuous signal.

[0061] In some embodiments, the control signal includes multiple second control sub-signals. The control module 50 has a preset power-duty cycle mapping table. The control module 50 can determine the second target control sub-signal according to the power-duty cycle mapping table and the output power. The second target control sub-signal is one of the multiple second control sub-signals. The control module 50 sends the second target control sub-signal to the signal generation module 10 so that the signal generation module 10 adjusts the duty cycle of the radio frequency signal in the continuous signal according to the second target control sub-signal.

[0062] Specifically, the control module 50 adjusts the duty cycle of the radio frequency signal in the continuous signal in a more refined manner to accommodate different levels of excessive power. This control method is achieved by pre-setting a "power-duty cycle mapping table", which defines the mapping relationship between different power ranges and corresponding duty cycle adjustment strategies.

[0063] The power-duty cycle mapping table is a data structure stored in the memory of the control module 50. It lists multiple power thresholds and the corresponding duty cycle adjustment strategy (i.e., the second control sub-signal) for each threshold. These strategies may include the specific value of reducing the duty cycle, the rate of duty cycle adjustment, etc.

[0064] Control methods include:

[0065] Power detection: The power detection unit continuously monitors the output power of the RF power amplifier module 20 and sends the power data to the control module 50.

[0066] Power comparison: The control module 50 compares the received power data with the output power threshold in the power-duty cycle mapping table to determine which range the current output power falls into.

[0067] Duty cycle determination: Based on the comparison results, control module 50 looks up the corresponding second target control sub-signal from the mapping table. This sub-signal specifies the duty cycle adjustment strategy to be adopted under the current output power.

[0068] Signal transmission: The control module 50 sends the second target control sub-signal to the signal generation module 10.

[0069] Duty cycle adjustment: The signal generation module 10 adjusts the duty cycle of the radio frequency signal in the continuous signal according to the received second target control sub-signal, so as to reduce the output power of the radio frequency power amplifier module 20.

[0070] By introducing a power-duty cycle mapping table, the RF defrosting circuit 100 can adjust the duty cycle of the RF signal in a more flexible and precise way, thereby effectively controlling the output power of the RF power amplifier module 20, ensuring the stable operation of the system and the safe use of the RF power amplifier module 20.

[0071] Please see Figure 2 In some embodiments, the radio frequency defrosting circuit 100 further includes an automatic gain control unit 60. The signal generation module 10 is connected to the radio frequency power amplifier module 20 through the automatic gain control unit 60 to send a continuous signal to the radio frequency power amplifier module 20. The control module 50 is also connected to the automatic gain control unit 60. The control module 50 is also used to send a control signal to the automatic gain control unit 60 to adjust the continuous signal when the state of the radio frequency power amplifier module 20 is abnormal.

[0072] Specifically, the introduction of the Automatic Gain Control (AGC) unit 60 provides the system with additional flexibility and stability. The main function of the AGC unit is to automatically adjust the gain of the continuous signal output from the signal generation module 10 to the RF power amplifier module 20, so as to ensure that the RF power amplifier module 20 can operate at an appropriate power level under various conditions.

[0073] The AGC unit receives a continuous signal from the signal generation module 10 and automatically adjusts the signal gain based on the current state of the RF power amplifier module 20 (such as output power, temperature, etc.) and preset standards. If the output power of the RF power amplifier module 20 is too high, the AGC will reduce the signal gain; conversely, if the output power is too low, it will increase the gain.

[0074] The AGC unit is located between the signal generation module 10 and the RF power amplifier module 20. The AGC unit receives the raw signal from the signal generation module 10, adjusts its gain, and then sends it to the RF power amplifier module 20.

[0075] In addition to automatically adjusting the gain, the AGC unit also receives control signals from the control module 50. In the event of an abnormal state of the RF power amplifier module 20 (such as overheating, overload, etc.), the control module 50 will send a control signal to the AGC, instructing it to further adjust the signal gain or take other protective measures.

[0076] In some embodiments, the radio frequency defrosting circuit 100 further includes a cooling fan, and the control module 50 is connected to the cooling fan. The control module 50 is also used to drive the cooling fan to cool the radio frequency power amplifier module 20 when the current temperature is higher than a preset temperature.

[0077] The addition of a cooling fan is a key component to ensure that the RF power amplifier module 20 maintains an appropriate temperature during prolonged high-power operation. When the RF power amplifier module 20 generates a large amount of heat and the environment is insufficient for natural heat dissipation, the activation of the cooling fan will effectively help reduce the temperature of the RF power amplifier module 20, preventing overheating and potential performance degradation or damage.

[0078] By working in conjunction with the control module 50, it ensures that the RF power amplifier module 20 can maintain a suitable temperature during long-term high-power operation, thereby protecting it from overheating damage and extending its service life.

[0079] In some implementations, the rated power is 200 watts.

[0080] Specifically, a radio frequency defrosting circuit 100 with a rated power of 200 watts means that the circuit can continuously and stably output 200 watts of power under normal operating conditions. At this power value, it can effectively heat and defrost food without damaging the radio frequency defrosting circuit 100 due to excessive power.

[0081] This application also provides a refrigerator, which includes a radio frequency defrosting circuit 100 that implements any of the above embodiments.

[0082] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with the described embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0083] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A radio frequency defrosting circuit for use in a refrigerator, characterized in that, The radio frequency defrosting circuit includes a signal generation module, a radio frequency power amplification module, a detection module, a control module, and a radio frequency antenna; The signal generation module is used to output a continuous signal, which includes a radio frequency signal; The radio frequency power amplification module is connected to the signal generation module and is used to generate a radio frequency amplification signal based on the radio frequency signal in the continuous signal. The radio frequency antenna is connected to the radio frequency power amplifier module and is used to transmit electromagnetic waves according to the radio frequency amplified signal. The detection module is connected to the radio frequency power amplifier module and is used to detect the status of the radio frequency power amplifier module; The control module connects the detection module and the signal generation module, and is used to send a control signal to the signal generation module when the state of the radio frequency power amplifier module is abnormal, so as to adjust the duty cycle of the radio frequency signal in the continuous signal.

2. The radio frequency defrosting circuit according to claim 1, characterized in that, The detection module includes a temperature detection unit, which is used to detect the current temperature of the radio frequency power amplifier module. The control module is used to send the control signal to the signal generation module when the current temperature is greater than a preset temperature, so as to reduce the duty cycle of the radio frequency signal in the continuous signal.

3. The radio frequency defrosting circuit according to claim 2, characterized in that, The control signal includes multiple first control sub-signals. The control module has a preset temperature-duty cycle mapping table. The control module can determine a first target control sub-signal based on the temperature-duty cycle mapping table and the current temperature. The first target control sub-signal is one of the multiple first control sub-signals. The first target control sub-signal is sent to the signal generation module so that the signal generation module adjusts the duty cycle of the radio frequency signal in the continuous signal according to the first target control sub-signal.

4. The radio frequency defrosting circuit according to claim 2, characterized in that, When the temperature is higher than the preset temperature, the duty cycle of the radio frequency signal in the continuous signal is 10%.

5. The radio frequency defrosting circuit according to claim 2, characterized in that, The detection module includes a power detection unit, the temperature detection unit is used to detect the output power of the radio frequency power amplifier module, and the control module is used to send a control signal to the signal generation module when the output power is greater than a preset power, so as to reduce the duty cycle of the radio frequency signal in the continuous signal.

6. The radio frequency defrosting circuit according to claim 5, characterized in that, The control signal includes multiple second control sub-signals. The control module has a preset power-duty cycle mapping table. The control module can determine the second target control sub-signal according to the power-duty cycle mapping table and the output power. The second target control sub-signal is one of the multiple second control sub-signals. The control module sends the second target control sub-signal to the signal generation module so that the signal generation module adjusts the duty cycle of the radio frequency signal in the continuous signal according to the second target control sub-signal.

7. The radio frequency defrosting circuit according to claim 6, characterized in that, The radio frequency defrosting circuit also includes an automatic gain control unit, and the signal generation module is connected to the radio frequency power amplifier module through the automatic gain control unit to send the continuous signal to the radio frequency power amplifier module; The control module is also connected to the automatic gain control unit, and the control module is also used to send a control signal to the automatic gain control unit to adjust the continuous signal when the state of the RF power amplifier module is abnormal.

8. The radio frequency defrosting circuit according to claim 2, characterized in that, The radio frequency defrosting circuit also includes a cooling fan, and the control module is connected to the cooling fan. The control module is also used to drive the cooling fan to cool the radio frequency power amplifier module when the current temperature is greater than the preset temperature.

9. The radio frequency defrosting circuit according to claim 1, characterized in that, The rated power is 200 watts.

10. A refrigerator, characterized in that, Includes the radio frequency defrosting circuit as described in any one of claims 1-9.

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