Radio frequency circuit and control method thereof, radio frequency heating device, equipment and medium

Abstract

The invention discloses a radio frequency circuit and a control method thereof, a radio frequency heating device, equipment and a medium, and the control method comprises the steps: controlling the radio frequency circuit to work in a first state, and the first state comprises that the working frequency point of a signal generation device is a preset frequency point, and the output power of a power amplifier is preset power; the preset power is smaller than rated output power of the power amplifier; controlling the signal generation device to traverse frequency points in a predetermined frequency band, and detecting the reflection power of the power amplifier in real time to obtain a target frequency point corresponding to the minimum reflection power; and controlling the signal generating device to work at the target frequency point, and adjusting the attenuation value of the automatic level control device, so that the output power of the power amplifier is the rated output power, and the attenuation value corresponding to the rated output power is the target attenuation value. An isolator is not needed, and the power amplifier can output rated power under different working frequencies by adjusting the attenuation value of the automatic level control device.

Description

Technical Field

[0001] This invention relates to the field of radio frequency heating technology, specifically to a radio frequency circuit and its control method, a radio frequency heating device, equipment, and medium. Background Technology

[0002] Radio frequency (RF) technology is often used in food processing and safety, such as using RF energy to directly heat food and using the thermal effect generated by RF energy to kill microorganisms in food.

[0003] In traditional radio frequency (RF) circuits, isolators are typically used to protect power amplifiers from damage caused by excessive reflected power. The main function of an isolator is to prevent reflected signals from returning to the power amplifier, thus avoiding damage. However, isolators are usually large and relatively expensive, and they also incur power losses during operation, reducing system efficiency. Summary of the Invention

[0004] The main objective of this invention is to provide a radio frequency circuit and its control method, radio frequency heating device, equipment and medium that, without the need for isolators, enables the power amplifier to output rated power at different operating frequencies by adjusting the attenuation value of the automatic level control device.

[0005] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0006] According to a first aspect of the present application, a control method for a radio frequency (RF) circuit is provided. The RF circuit includes a signal generating device, an automatic level control device, and a power amplifier. The signal generating device provides an operating frequency to the automatic level control device, and the automatic level control device provides an operating voltage to the power amplifier to enable the power amplifier to provide output power. The control method includes:

[0007] The radio frequency circuit is controlled to operate in a first state, wherein the operating frequency of the signal generator is a preset frequency and the output power of the power amplifier is a preset power, wherein the preset power is less than the rated output power of the power amplifier;

[0008] The signal generating device is controlled to traverse the frequency points within the predetermined frequency band, and the reflected power of the power amplifier is detected in real time to obtain the target frequency point corresponding to the minimum reflected power;

[0009] The signal generating device is controlled to operate at the target frequency, and the attenuation value of the automatic level control device is adjusted so that the output power of the power amplifier is the rated output power, and the attenuation value corresponding to the rated output power is the target attenuation value.

[0010] Optionally, the method further includes: detecting the reflected power of the power amplifier in real time; and adjusting the attenuation value of the automatic level control device when the reflected power of the power amplifier is greater than or equal to a reflected power threshold, so that the reflected power of the power amplifier is less than the reflected power threshold.

[0011] Optionally, the method further includes: detecting the operating temperature of the power amplifier in real time; and adjusting the attenuation value of the automatic level control device when the operating temperature of the power amplifier is greater than or equal to a temperature threshold, so that the operating temperature of the power amplifier is less than the temperature threshold.

[0012] Optionally, the method further includes: detecting the output power of the power amplifier in real time; and adjusting the attenuation value of the automatic level control device when the output power of the power amplifier is greater than or equal to a power threshold, so that the output power of the power amplifier is less than the power threshold, and the power threshold is greater than the rated output power.

[0013] Optionally, the method further includes: cyclically executing the process of determining the target frequency and the target attenuation value at a preset frequency.

[0014] According to a second aspect of the present application, a radio frequency circuit is provided, comprising: a signal generating device, an automatic level control device, a power amplifier, and a control unit. The signal generating device is configured to provide an operating frequency to the automatic level control device, the automatic level control device is configured to provide an operating voltage to the power amplifier to enable the power amplifier to provide output power, and the control unit is configured to:

[0015] The radio frequency circuit is controlled to operate in a first state, wherein the operating frequency of the signal generator is a preset frequency and the output power of the power amplifier is a preset power, wherein the preset power is less than the rated output power of the power amplifier;

[0016] The signal generating device is controlled to traverse the frequency points within the predetermined frequency band, and the reflected power of the power amplifier is detected in real time to obtain the target frequency point corresponding to the minimum reflected power;

[0017] The signal generating device is controlled to operate at the target frequency, and the attenuation value of the automatic level control device is adjusted so that the output power of the power amplifier is the rated output power, and the attenuation value corresponding to the rated output power is the target attenuation value.

[0018] Optionally, the control unit is further configured to:

[0019] Real-time detection of the reflected power of the power amplifier;

[0020] When the reflected power of the power amplifier is greater than or equal to the reflected power threshold, the attenuation value of the automatic level control device is adjusted so that the reflected power of the power amplifier is less than the reflected power threshold.

[0021] Optionally, the control unit is further configured to:

[0022] Real-time monitoring of the operating temperature of the power amplifier;

[0023] When the operating temperature of the power amplifier is greater than or equal to a temperature threshold, the attenuation value of the automatic level control device is adjusted so that the operating temperature of the power amplifier is less than the temperature threshold.

[0024] Optionally, the control unit is further configured to:

[0025] Real-time detection of the output power of the power amplifier;

[0026] When the output power of the power amplifier is greater than or equal to the power threshold, the attenuation value of the automatic level control device is adjusted so that the output power of the power amplifier is less than the power threshold, and the power threshold is greater than the rated output power.

[0027] Optionally, the control unit is further configured to:

[0028] The process of determining the target frequency and the target attenuation value is executed cyclically according to a preset frequency.

[0029] Optionally, the control unit includes a control chip, a temperature detection device, and a power detection device. The control chip detects the operating temperature of the power amplifier through the temperature detection device and detects the output power of the power amplifier through the power detection device.

[0030] According to a third aspect of the embodiments of this application, a radio frequency heating device is provided, including the radio frequency circuit described in the second aspect, and further including a heating antenna, wherein the heating antenna is connected to the power output terminal of the power amplifier in the radio frequency circuit.

[0031] According to a fourth aspect of the embodiments of this application, an apparatus is provided, including the radio frequency heating device described in the third aspect.

[0032] According to a fifth aspect of the present application, an electronic device is provided, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method described in the first aspect above.

[0033] According to a sixth aspect of the embodiments of this application, a computer-readable storage medium is provided having computer-readable instructions stored thereon, which can be executed by a processor to implement the method described in the first aspect above.

[0034] In summary, embodiments of this application provide a radio frequency (RF) circuit and its control method, an RF heating device, an apparatus, and a medium. The RF circuit includes a signal generating device, an automatic level control device, and a power amplifier. The signal generating device provides an operating frequency to the automatic level control device, and the automatic level control device provides an operating voltage to the power amplifier to enable the power amplifier to provide output power. The control method includes: controlling the RF circuit to operate in a first state, wherein the first state includes the operating frequency of the signal generating device being a preset frequency and the output power of the power amplifier being a preset power, the preset power being less than the rated output power of the power amplifier; controlling the signal generating device to traverse frequency points within a predetermined frequency band and detect the reflected power of the power amplifier in real time to obtain a target frequency point corresponding to the minimum reflected power; controlling the signal generating device to operate at the target frequency point and adjusting the attenuation value of the automatic level control device so that the output power of the power amplifier is the rated output power, the attenuation value corresponding to the rated output power being the target attenuation value.

[0035] The technical solution disclosed herein controls the radio frequency circuit to operate in a first state. During the process of controlling the signal generating device to traverse frequency points within a predetermined frequency band, the reflected power of the power amplifier is detected in real time, and the target frequency point corresponding to the minimum reflected power is obtained. The signal generating device is then controlled to operate at the target frequency point. By adjusting the attenuation value of the automatic level control device, the output power of the power amplifier is made to the rated output power, thereby finding the target attenuation value corresponding to the rated output power. This allows the radio frequency circuit to be controlled to operate at the target frequency point and the target attenuation value. Since the target frequency point corresponds to the minimum reflected power, when the radio frequency circuit operates at the target frequency point and the target attenuation value, the reflected power of the radio frequency circuit can maintain the minimum reflected power, avoiding damage to the power amplifier due to excessive reflected power. Therefore, the radio frequency circuit of this disclosure will not experience excessive reflected power during operation, eliminating the need for an isolator to protect the power amplifier. This not only avoids damage to the power amplifier but also reduces the product's size and cost. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0037] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0038] Figure 1 A flowchart of a control method for a radio frequency circuit provided in an embodiment of this application;

[0039] Figure 2 This is a schematic diagram of a radio frequency circuit provided in an embodiment of this application;

[0040] Figure 3 Another radio frequency circuit schematic diagram provided for an embodiment of this application;

[0041] Figure 4 This paper shows a structural diagram of an electronic device provided in an embodiment of this application;

[0042] Figure 5 A diagram of a computer-readable storage medium provided in an embodiment of this application is shown.

[0043] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0045] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0046] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0049] Figure 1 This application illustrates a control method for a radio frequency circuit, wherein the radio frequency circuit includes a signal generating device, an automatic level control device, and a power amplifier. The signal generating device provides an operating frequency to the automatic level control device, and the automatic level control device provides an operating voltage to the power amplifier so that the power amplifier provides output power.

[0050] Based on the above-described radio frequency circuit, the control method includes the following steps:

[0051] Step 101: Control the radio frequency circuit to operate in a first state, wherein the first state includes the operating frequency of the signal generator being a preset frequency and the output power of the power amplifier being a preset power, wherein the preset power is less than the rated output power of the power amplifier;

[0052] Step 102: Control the signal generating device to traverse the frequency points within the predetermined frequency band and detect the reflected power of the power amplifier in real time to obtain the target frequency point corresponding to the minimum reflected power;

[0053] Step 103: Control the signal generating device to operate at the target frequency, and adjust the attenuation value of the automatic level control device so that the output power of the power amplifier is the rated output power, and the attenuation value corresponding to the rated output power is the target attenuation value.

[0054] First, the RF circuit operates in its initial state, where the operating frequency of the signal generator and the output power of the power amplifier are set to preset values. This preset ensures the circuit is in a known and controllable state upon startup, thus improving system stability. Next, the signal generator traverses frequencies within the predetermined band and monitors the reflected power of the power amplifier in real time. This process helps find the optimal target frequency—the frequency corresponding to the minimum reflected power—thereby optimizing signal transmission efficiency and quality. During operation, the attenuation value of the automatic level control device is adjusted to ensure the power amplifier operates at its rated output power at the target frequency. This ensures the power amplifier operates in optimal condition, further improving signal transmission efficiency and quality.

[0055] By adopting the technical solution of this disclosure, the target frequency and target attenuation value can be determined, thereby controlling the RF circuit to operate at the target frequency and target attenuation value. Since the target frequency corresponds to the minimum reflected power, when the RF circuit operates at the target frequency and target attenuation value, the reflected power of the RF circuit can be kept at the minimum reflected power, avoiding damage to the power amplifier due to excessive reflected power. Therefore, the RF circuit of this disclosure will not experience excessive reflected power during operation, and there is no need to add an isolator to protect the power amplifier. This not only avoids damage to the power amplifier, but also reduces the size and cost of the product.

[0056] In one possible implementation, the method further includes: real-time detection of the reflected power of the power amplifier; and, if the reflected power of the power amplifier is greater than or equal to a reflected power threshold, adjusting the attenuation value of the automatic level control device so that the reflected power of the power amplifier is less than the reflected power threshold. This prevents the reflected power of the radio frequency circuit from exceeding the reflected power threshold during operation, thus protecting the power amplifier from damage due to the reflected power exceeding the threshold.

[0057] The method also includes real-time detection of the reflected power of the power amplifier and adjustment of the attenuation value when the reflected power is greater than or equal to a preset threshold. This helps ensure that the reflected power of the system is always under control, reducing signal loss and system interference.

[0058] In one possible implementation, the method further includes: real-time detection of the operating temperature of the power amplifier; and, if the operating temperature of the power amplifier is greater than or equal to a temperature threshold, adjusting the attenuation value of the automatic level control device so that the operating temperature of the power amplifier is less than the temperature threshold.

[0059] By controlling the operating temperature of the power amplifier, damage caused by overheating can be prevented, as overheating can lead to signal distortion. Temperature control reduces this distortion, improving signal quality and overall system performance.

[0060] In one possible implementation, the method further includes: detecting the output power of the power amplifier in real time; and adjusting the attenuation value of the automatic level control device when the output power of the power amplifier is greater than or equal to a power threshold, such that the output power of the power amplifier is less than the power threshold, and the power threshold is greater than the rated output power.

[0061] During the operation of the power amplifier, its output power is monitored in real time to ensure it does not exceed the set power threshold, thus preventing hardware damage or overheating caused by prolonged high-load operation. These measures ensure that the power amplifier operates stably and efficiently under various operating conditions.

[0062] In one possible implementation, the method further includes: cyclically executing the process of determining the target frequency and the target attenuation value at a preset frequency.

[0063] By periodically re-evaluating and adjusting, the RF circuitry is ensured to always operate at the optimal frequency and attenuation value. By continuously optimizing the target frequency and attenuation value, the efficiency of the power amplifier can be improved.

[0064] Through dynamic adjustment and real-time monitoring, this control method improves the adaptability of the RF circuit to different operating conditions. Regardless of environmental changes or varying operational requirements, the system can quickly respond and adjust to its optimal state.

[0065] Based on the same technological concept, such as Figure 2 As shown in the illustration, this application also provides a radio frequency circuit, including: a signal generating device, an automatic level control device, a power amplifier, and a control unit. The signal generating device is used to provide an operating frequency to the automatic level control device, the automatic level control device is used to provide an operating voltage to the power amplifier so that the power amplifier provides output power, and the control unit is configured to:

[0066] The radio frequency circuit is controlled to operate in a first state, wherein the operating frequency of the signal generator is a preset frequency and the output power of the power amplifier is a preset power, wherein the preset power is less than the rated output power of the power amplifier;

[0067] The signal generating device is controlled to traverse the frequency points within the predetermined frequency band, and the reflected power of the power amplifier is detected in real time to obtain the target frequency point corresponding to the minimum reflected power;

[0068] The signal generating device is controlled to operate at the target frequency, and the attenuation value of the automatic level control device is adjusted so that the output power of the power amplifier is the rated output power, and the attenuation value corresponding to the rated output power is the target attenuation value.

[0069] The signal generator can traverse different frequency points according to the control unit's instructions, improving the circuit's adaptability to different frequencies. The automatic level control device adjusts the attenuation value according to the control unit's instructions, ensuring that the power amplifier's output power reaches the rated value, thus improving power utilization. Under the management of the control unit, the power amplifier operates in an optimal state, improving the efficiency and performance of the entire RF circuit.

[0070] By detecting reflected power in real time and finding the target frequency point corresponding to the minimum reflected power, the circuit can operate with higher efficiency and reduce energy loss. By adjusting the attenuation value, the circuit can achieve the rated output power of the power amplifier, avoiding overload or underload problems.

[0071] In one possible implementation, the control unit is further configured to:

[0072] The reflected power of the power amplifier is detected in real time; if the reflected power of the power amplifier is greater than or equal to the reflected power threshold, the attenuation value of the automatic level control device is adjusted so that the reflected power of the power amplifier is less than the reflected power threshold.

[0073] By monitoring and adjusting the reflected power in real time, it is ensured to remain below a safe threshold, reducing signal distortion and system interference. The attenuation value is automatically adjusted in response to the real-time status of the power amplifier, ensuring optimal performance under various conditions.

[0074] In one possible implementation, the control unit is further configured to:

[0075] The operating temperature of the power amplifier is monitored in real time; if the operating temperature of the power amplifier is greater than or equal to a temperature threshold, the attenuation value of the automatic level control device is adjusted so that the operating temperature of the power amplifier is less than the temperature threshold.

[0076] The system monitors the power amplifier's temperature in real time and takes measures to reduce the temperature when it exceeds a threshold, preventing overheating damage and ensuring long-term stable operation. It automatically adjusts the attenuation value to respond to the power amplifier's real-time status, ensuring optimal performance under various conditions.

[0077] In one possible implementation, the control unit is further configured to:

[0078] The output power of the power amplifier is detected in real time; when the output power of the power amplifier is greater than or equal to a power threshold, the attenuation value of the automatic level control device is adjusted so that the output power of the power amplifier is less than the power threshold, and the power threshold is greater than the rated output power.

[0079] It controls the power amplifier's output power to not exceed a set threshold, protecting the hardware from damage even under high load conditions. It automatically adjusts the attenuation value in response to the power amplifier's real-time status, ensuring optimal performance under various conditions.

[0080] In one possible implementation, the control unit is further configured to: cyclically execute the process of determining the target frequency and the target attenuation value at a preset frequency.

[0081] The control unit automatically and cyclically executes the process of determining the target frequency and target attenuation value according to the preset frequency, ensuring that the radio frequency circuit always operates with optimal parameters.

[0082] In one possible implementation, the control unit includes a control chip, a temperature detection device, and a power detection device. The control chip detects the operating temperature of the power amplifier through the temperature detection device and detects the output power of the power amplifier through the power detection device.

[0083] The control unit integrates a control chip, a temperature detection device, and a power detection device, enabling comprehensive monitoring and control of the power amplifier. The temperature detection device allows the control unit to monitor the power amplifier's operating temperature in real time, promptly detecting overheating issues. The power detection device allows the control unit to monitor the power amplifier's output power in real time, ensuring it remains within safe limits.

[0084] The control method of the radio frequency circuit provided in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0085] Figure 3 The present application provides a schematic diagram of a radio frequency circuit structure, which specifically includes the following devices:

[0086] Antenna System (Voltage Controlled Oscillator, VCO): Used to transmit radio frequency signals for polarized heating. It converts radio frequency energy into heat energy for defrosting and heating food. The VCO generates an adjustable frequency radio frequency signal, the frequency of which can be adjusted by a control voltage. The MCU adjusts the VCO frequency according to system requirements to find the optimal operating frequency. The main components of the signal are a crystal oscillator and a phase-locked loop (PLL). A crystal oscillator is an oscillator that uses the piezoelectric effect of a quartz crystal to generate a stable frequency. It is typically used to provide a stable clock signal for electronic devices. The output frequency of the crystal oscillator is fixed, for example, 26MHz. The desired frequency band is achieved by frequency multiplication (increasing the frequency of the input signal to an integer multiple) or frequency division (reducing the frequency of the input signal to an integer fraction). A phase-locked loop is an electronic circuit that locks onto the phase of an input signal and generates an output signal with the same or proportional frequency as the input signal. PLLs can be used for frequency synthesis, frequency modulation / demodulation, clock recovery, and many other applications.

[0087] In addition, the signal source can perform frequency hopping, allowing it to change arbitrarily within a frequency band. Frequency hopping is a communication technique that allows a signal to switch rapidly between multiple preset frequencies. This technique can improve the signal's anti-interference capability and security because it is difficult for an eavesdropper to predict which frequency the signal will be on. Frequency hopping is commonly used in military communications and some wireless communication standards, such as Bluetooth.

[0088] Automatic Level Control (ALC): Used to adjust output power in real time to address overheating, overpower, or excessive reflected power. When overheating or overpower occurs, the attenuation value is adjusted in real time to protect the system. The ALC system monitors the output signal level and automatically adjusts the gain or attenuation to maintain the signal within a certain range. If the output signal is too strong, the ALC system increases the attenuation value, reducing the signal output; if the signal is too weak, it decreases the attenuation value, increasing the signal output.

[0089] Power Amplifier (PA): Amplifies the signal generated by the signal generator to the rated power required by the system (e.g., 200W). The PA receives the signal from the VCO and amplifies it to the required power level (e.g., 200W). The output power of the PA is controlled by the MCU through the ALC system.

[0090] Signal generator RF output (RFout): Generates a continuous radio frequency (RF) signal. RFout is the system's output section, transmitting the RF signal, amplified by the PA and adjusted by the ALC, to the load (such as defrosted food). The RF energy is converted into heat energy at the load, achieving the purpose of defrosting or heating.

[0091] Microcontroller (MCU): Responsible for monitoring and controlling the entire system, including temperature detection and power detection.

[0092] AC-DC converter: Converts alternating current (AC) to direct current (DC) to provide a stable power supply for circuits.

[0093] AC input: The power input section of the system, which provides AC power.

[0094] Temperature detection device: monitors the operating temperature of the PA.

[0095] Power detection device: monitors the output power of the PA.

[0096] The MCU monitors the system status and controls the PA's output power via the ALC system. The VCO generates an adjustable frequency signal, and the MCU adjusts the frequency based on feedback to optimize system performance. The PA amplifies the VCO signal to the required power and outputs it through RFout. The system dynamically adjusts under the control of the MCU to adapt to different operating conditions and requirements.

[0097] The control method for the aforementioned radio frequency circuit specifically includes the following stages:

[0098] Phase 1: Initial Phase

[0099] When the system starts up, the VCO generates a signal, and the MCU controls it to operate at low power (e.g., 30W) to reduce thermal shock. The VCO adjusts the frequency, and the MCU adjusts the frequency based on feedback to optimize system performance and find the frequency point with the minimum reflected power.

[0100] The system iterates through different frequencies within the specified frequency band to find the frequency with the smallest S11 parameter value. A smaller S11 value indicates a lower ratio of reflected power to input power, resulting in better system matching. If the S11 value at the initial frequency is less than -8dB (a set threshold indicating sufficiently good system matching), a suitable starting frequency is considered found. Once the optimal S11 value is found, the system locks onto this frequency and then gradually increases the output power by adjusting the ALC (Automatic Level Control) attenuation value.

[0101] Phase Two: Frequency Locking and Power Boost

[0102] Once the optimal frequency is found, the system locks onto that frequency. The output power is then gradually increased to the rated power (e.g., 200W) via the ALC system, in increments of +5dB, +1dB, and +0.5dB.

[0103] Phase 3: Real-time monitoring of reflected power, temperature, and output power by the MCU:

[0104] The MCU monitors the reflected power in real time; if it is too high, the output power is reduced via the ALC system. The PA's operating temperature is also monitored in real time; if it exceeds a threshold, the output power is reduced via the ALC system. Finally, the output power is monitored in real time; if it exceeds a threshold, the output power is reduced via the ALC system.

[0105] Phase 4: Parameter Monitoring

[0106] S11 parameter monitoring: When the S11 value deteriorates, the system re-hops to find a new optimal frequency. Optimizing the S11 parameter ensures energy transfer efficiency and reduces reflections.

[0107]

[0108] P r It is the reflected power, P i It is the input power.

[0109] The S11 parameter represents the ratio of reflected power to input power and is used to evaluate the matching degree of an antenna system. A smaller S11 value indicates lower reflected power and higher system efficiency. The S11 parameter is a very important indicator in radio frequency systems, typically used to describe the reflection characteristics of antennas or transmission line systems. The value of the S11 parameter is calculated by measuring the ratio of reflected power to input power, and is usually expressed in decibels (dB).

[0110] A deteriorating S11 value typically indicates increased reflected power: a larger S11 value (a smaller numerical value because decibels are negative) means an increased proportion of power reflected back to the source relative to the input power. This usually means reduced system efficiency, as more power is not being effectively utilized and is being reflected back. Poor impedance matching: In RF systems, ideal impedance matching means that all input power is delivered to the load, with no power reflected. A deteriorating S11 value may indicate poor impedance matching between system components, which could be due to component aging, temperature variations, mechanical vibration, or other environmental factors. System stability issues: A deteriorating S11 value can lead to system stability problems such as self-oscillation or signal distortion, which can affect system performance and reliability. Equipment damage risk: The prolonged presence of high reflected power can damage components in RF systems, especially power amplifiers, as they need to handle the additional power reflected back.

[0111] In radio frequency defrosting control systems, monitoring and timely adjustment of the S11 value is crucial for ensuring efficient and stable system operation. If the S11 value deteriorates below a certain threshold (e.g., below -8dB), the system may need to take measures such as reselecting the operating frequency or adjusting the ALC attenuation value to restore the system's matching and efficiency.

[0112] Phase 5: Readjustment and Optimization

[0113] After stable operation, the VCO frequency source is readjusted to find a new optimal frequency. Based on the new optimal frequency, the ALC attenuation value is readjusted to achieve rated power output.

[0114] The power increase increments are +5dB, +1dB, and +0.5dB in sequence, until the rated power of 200W is reached. This gradual increase helps the system stably adapt to higher power outputs while avoiding instability or damage caused by sudden power increases.

[0115] If the adjustment accuracy of the ALC attenuator is insufficient to accurately reach 200W, the system will fine-tune by adjusting the leakage voltage to ensure that the output power accurately reaches 200W.

[0116] During system operation, if the S11 value deteriorates (i.e., reflected power increases, and the S11 value drops below -8dB), the system will consider the current frequency unsuitable and require a new frequency selection. The system will re-hop frequencies, traversing the frequency band again to find a new optimal S11 value. After finding the new optimal value, the system will repeat the second step, readjusting the ALC attenuation value and gradually increasing the output power to 200W.

[0117] In summary, this application provides a radio frequency (RF) circuit and its control method, an RF heating device, an apparatus, and a medium. The RF circuit includes a signal generating device, an automatic level control device, and a power amplifier. The signal generating device provides an operating frequency to the automatic level control device, and the automatic level control device provides an operating voltage to the power amplifier to enable the power amplifier to provide output power. The control method includes: controlling the RF circuit to operate in a first state, wherein the first state includes the operating frequency of the signal generating device being a preset frequency and the output power of the power amplifier being a preset power, the preset power being less than the rated output power of the power amplifier; controlling the signal generating device to traverse frequency points within a predetermined frequency band and detecting the reflected power of the power amplifier in real time to obtain a target frequency point corresponding to the minimum reflected power; controlling the signal generating device to operate at the target frequency point and adjusting the attenuation value of the automatic level control device so that the output power of the power amplifier is the rated output power, the attenuation value corresponding to the rated output power being the target attenuation value. Without the need for an isolator, by adjusting the attenuation value of the automatic level control device, the power amplifier can output rated power at different operating frequencies.

[0118] Based on the same technical concept, this application embodiment also provides a radio frequency heating device, including the above-mentioned radio frequency circuit, and further including a heating antenna, wherein the heating antenna is connected to the power output terminal of the power amplifier in the radio frequency circuit.

[0119] Based on the same technical concept, this application also provides a device, including the aforementioned radio frequency heating device. The device can be a refrigerator, microwave oven, or other device with a defrosting function.

[0120] This application also provides an electronic device corresponding to the method provided in the foregoing embodiments. Please refer to... Figure 4 The diagram illustrates an electronic device provided by some embodiments of this application. The electronic device 20 may include: a processor 200, a memory 201, a bus 202, and a communication interface 203, wherein the processor 200, the communication interface 203, and the memory 201 are connected via the bus 202; the memory 201 stores a computer program that can run on the processor 200, and when the processor 200 runs the computer program, it executes the method provided by any of the foregoing embodiments of this application.

[0121] The memory 201 may include high-speed random access memory (RAM) or non-volatile memory, such as at least one disk storage device. Communication between this system network element and at least one other network element is achieved through at least one physical port (which can be wired or wireless), such as the Internet, wide area network, local area network, or metropolitan area network.

[0122] Bus 202 can be an ISA bus, PCI bus, or EISA bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. The memory 201 is used to store programs. After receiving an execution instruction, the processor 200 executes the program. The method disclosed in any of the foregoing embodiments of this application can be applied to the processor 200, or implemented by the processor 200.

[0123] The processor 200 may be an integrated circuit chip with signal processing capabilities. In implementation, each step of the above method can be completed by the integrated logic circuitry in the hardware of the processor 200 or by instructions in software form. The processor 200 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules may reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in memory 201. The processor 200 reads the information in memory 201 and, in conjunction with its hardware, completes the steps of the above method.

[0124] The electronic devices and methods provided in the embodiments of this application are based on the same inventive concept and have the same beneficial effects as the methods they employ, operate, or implement.

[0125] This application also provides a computer-readable storage medium corresponding to the method provided in the foregoing embodiments. Please refer to... Figure 5 The computer-readable storage medium shown is an optical disc 30, on which a computer program (i.e., a program product) is stored, which, when run by a processor, executes the methods provided in any of the foregoing embodiments.

[0126] It should be noted that examples of the computer-readable storage medium may also include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other optical and magnetic storage media, which will not be elaborated here.

[0127] The computer-readable storage medium provided in the above embodiments of this application and the method provided in the embodiments of this application are based on the same inventive concept and have the same beneficial effects as the methods adopted, run or implemented by the applications stored therein.

[0128] It should be noted that the above embodiments are illustrative of this application and not restrictive, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. This application can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

[0129] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0130] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A control method of a radio frequency circuit, characterized by, The radio frequency circuit includes a signal generating device, an automatic level control device and a power amplifier, the signal generating device is used to provide a working frequency to the automatic level control device, the automatic level control device is used to provide a working voltage to the power amplifier, so that the power amplifier provides output power, and the control method comprises: controlling the radio frequency circuit to work in a first state, the first state comprising that the working frequency point of the signal generating device is a preset frequency point, and the output power of the power amplifier is a preset power, and the preset power is less than the rated output power of the power amplifier; controlling the signal generating device to traverse the frequency points in a predetermined frequency range, and detecting the reflected power of the power amplifier in real time to obtain a target frequency point corresponding to the minimum reflected power; controlling the signal generating device to work at the target frequency point, and adjusting the attenuation value of the automatic level control device, so that the output power of the power amplifier is the rated output power, and the attenuation value corresponding to the rated output power is a target attenuation value.

2. The method of claim 1, wherein, The method further comprises: detecting the reflected power of the power amplifier in real time; in the case that the reflected power of the power amplifier is greater than or equal to a reflected power threshold value, adjusting the attenuation value of the automatic level control device, so that the reflected power of the power amplifier is less than the reflected power threshold value.

3. The method of claim 1, wherein, The method further comprises: detecting the working temperature of the power amplifier in real time; in the case that the working temperature of the power amplifier is greater than or equal to a temperature threshold value, adjusting the attenuation value of the automatic level control device, so that the working temperature of the power amplifier is less than the temperature threshold value.

4. The method of claim 1, wherein, The method further comprises: detecting the output power of the power amplifier in real time; in the case that the output power of the power amplifier is greater than or equal to a power threshold value, adjusting the attenuation value of the automatic level control device, so that the output power of the power amplifier is less than the power threshold value, and the power threshold value is greater than the rated output power.

5. The method of any one of claims 1-4, wherein, The method further comprises: cyclically executing the process of determining the target frequency point and the target attenuation value according to a preset frequency.

6. A radio frequency circuit, characterized by comprises: a signal generating device, an automatic level control device, a power amplifier and a control unit, the signal generating device is used to provide a working frequency to the automatic level control device, the automatic level control device is used to provide a working voltage to the power amplifier, so that the power amplifier provides output power, and the control unit is configured to: control the radio frequency circuit to work in a first state, the first state comprising that the working frequency point of the signal generating device is a preset frequency point, and the output power of the power amplifier is a preset power, and the preset power is less than the rated output power of the power amplifier; controlling the signal generating device to traverse the frequency points in a predetermined frequency range, and detecting the reflected power of the power amplifier in real time to obtain a target frequency point corresponding to the minimum reflected power; controlling the signal generating device to work at the target frequency point, and adjusting the attenuation value of the automatic level control device, so that the output power of the power amplifier is the rated output power, and the attenuation value corresponding to the rated output power is a target attenuation value.

7. The radio frequency circuit of claim 6, wherein, The control unit is further configured to: detect the reflected power of the power amplifier in real time; adjust the attenuation value of the automatic level control device so that the reflected power of the power amplifier is less than the reflected power threshold value, if the reflected power of the power amplifier is greater than or equal to the reflected power threshold value.

8. The radio frequency circuit of claim 6, wherein, The control unit is further configured to: detect the operating temperature of the power amplifier in real time; adjust the attenuation value of the automatic level control device so that the operating temperature of the power amplifier is less than the temperature threshold value, if the operating temperature of the power amplifier is greater than or equal to the temperature threshold value.

9. The radio frequency circuit of claim 6, wherein, The control unit is further configured to: detect the output power of the power amplifier in real time; adjust the attenuation value of the automatic level control device so that the output power of the power amplifier is less than the power threshold value, if the output power of the power amplifier is greater than or equal to the power threshold value, the power threshold value being greater than the rated output power.

10. The radio frequency circuit of any one of claims 6-9, wherein, The control unit is further configured to: perform the process of determining the target frequency point and the target attenuation value in a cycle according to a preset frequency.

11. The radio frequency circuit of claim 6, wherein, The control unit comprises a control chip, a temperature detection device and a power detection device, the control chip detects the operating temperature of the power amplifier through the temperature detection device and detects the output power of the power amplifier through the power detection device.

12. A radio frequency heating apparatus characterized by comprising: The radio frequency circuit according to any one of claims 6-11, further comprising a heating antenna, the heating antenna being connected to a power output end of a power amplifier in the radio frequency circuit.

13. An apparatus, comprising: The radio frequency heating device according to claim 12.

14. An electronic device comprising: A memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the computer program to implement the method according to any one of claims 1-5.

15. A computer readable storage medium characterized by: A computer readable medium having stored thereon computer readable instructions executable by a processor to implement the method according to any one of claims 1-5.

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