Refrigerator power supply control system based on RFID technology

Abstract

The invention discloses a refrigerator power supply control system based on an RFID technology, which comprises a main control circuit and a power supply circuit, and an RFID module is arranged between the main control circuit and the power supply circuit; the main control circuit integrates a core chip, a communication interface, a Wi-Fi module and a power management unit; the power supply circuit integrates a rectification filtering module, a discharging circuit and a voltage detection circuit. The RFID module is integrated with an antenna array, a signal processing unit, a dynamic impedance analysis unit, a load state classifier unit and a three-dimensional positioning algorithm unit; through three innovative dimensions of multi-modal sensing fusion, embedded AI algorithm deployment and hardware-level closed-loop control, the industrial pain points of high energy consumption, multiple misoperation and lack of intelligent sensing capability of the refrigerator are solved, the load state is dynamically responded and recognized through radio frequency signals, and the intelligent sensing capability of the refrigerator is improved by combining self-adaptive power supply regulation and control and low-power-consumption discharge circuit design. The problems of energy waste and insufficient equipment protection of a traditional refrigerator are solved, and energy efficiency optimization and reliability improvement are achieved.

Description

Technical Field

[0001] This invention specifically relates to the field of power management technology for household appliances, and more particularly to a refrigerator power control system based on RFID technology. Background Technology

[0002] RFID, also known as radio frequency identification technology, is a non-contact automatic identification technology based on the principle of radio frequency electromagnetic field coupling. It achieves contactless data reading and writing and target identification through radio signals.

[0003] Traditional refrigerator power control has the following drawbacks: 1. In static power supply mode, high power consumption is maintained even under low load, resulting in energy waste; 2. Voltage fluctuations can easily cause the compressor to start and stop frequently, shortening the equipment's lifespan; 3. In existing technology, the discharge circuit generates unnecessary power consumption during normal power supply.

[0004] To better address the aforementioned issues, RFID technology is applied to refrigerator power control. By monitoring the dynamic response of radio frequency signals in real time, the load status of the equipment can be accurately identified, providing a new approach to power control. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a refrigerator power control system based on RFID technology.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A refrigerator power control system based on RFID technology includes a main control circuit and a power supply circuit, and an RFID module is also provided between the main control circuit and the power supply circuit. The main control circuit integrates the core chip, communication interface, Wi-Fi module and power management unit; The power supply circuit integrates a rectifier and filter module, a discharge circuit, and a voltage detection circuit. The RFID module integrates an antenna array, a signal processing unit, a dynamic impedance analysis unit, a load status classifier unit, and a three-dimensional positioning algorithm unit.

[0007] Furthermore, the core chip is a 32-bit ARM Cortex-M7 processor, and the communication interface uses a CAN bus to communicate with the refrigerator's main control board and transmit load status commands and power supply parameters.

[0008] Based on the aforementioned scheme, the power management unit integrates an LDO low-dropout linear regulator and a DC-DC converter.

[0009] As a further embodiment of the present invention, the rectifier and filter module includes a rectifier bridge and a filter capacitor, and the discharge circuit includes an optocoupler bidirectional thyristor and a discharge resistor.

[0010] Furthermore, the voltage detection circuit includes a voltage divider resistor network and overvoltage / undervoltage protection.

[0011] Based on the aforementioned scheme, the signal processing unit integrates a high-speed ADC, FPGA, and wavelet transform denoising algorithm.

[0012] As a further embodiment of the present invention, the dynamic impedance analysis unit integrates a fast Fourier transform (FFT) algorithm.

[0013] Furthermore, the load state classifier unit employs the support vector machine (SVM) algorithm.

[0014] Based on the aforementioned scheme, the RFID module integrates a PWM control algorithm.

[0015] As a further embodiment of the present invention, the power supply circuit integrates a Hall current sensor, a temperature sensor, and a buzzer.

[0016] The beneficial effects of this invention are as follows: This solution uses RFID technology as the core interaction medium, embedded between the main control and power supply circuits, to achieve non-contact identification and dynamic impedance analysis of the load inside the refrigerator. Combined with dynamic impedance analysis (FFT) and wavelet transform denoising, it effectively filters out strong interference signals such as motor starting and compressor operation, achieving high-precision modeling of the load's true power consumption state.

[0017] By innovating through three dimensions—multimodal sensing fusion, embedded AI algorithm deployment, and hardware-level closed-loop control—this technology addresses industry pain points such as high energy consumption, frequent malfunctions, and lack of intelligent sensing capabilities in refrigerators. It identifies load status through dynamic response of radio frequency signals and combines adaptive power supply regulation and low-power discharge circuit design to solve the problems of energy waste and insufficient equipment protection in traditional refrigerators, thereby achieving energy efficiency optimization and reliability improvement. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the power control system proposed in this invention; Figure 2 This is a schematic diagram of the RFID module proposed in this invention. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Examples of the 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 patent, and should not be construed as limiting this patent.

[0021] Reference Figure 1-2 A refrigerator power control system based on RFID technology includes an RFID module, a main control circuit, and a power supply circuit. It should be noted that the main control circuit integrates the core chip, communication interface, Wi-Fi module and power management unit; The core chip uses a 32-bit ARM Cortex-M7 processor with an operating frequency of ≥200MHz, supporting multi-task parallel processing.

[0022] The communication interface uses a CAN bus to communicate with the refrigerator's main control board and transmit load status commands and power supply parameters.

[0023] Wi-Fi module: Supports remote monitoring and firmware upgrades, and is compatible with the MQTT protocol.

[0024] Power Management Unit: Integrates an LDO (Low Dropout Linear Regulator) and a DC-DC converter to provide stable power to the RFID module and main control circuit.

[0025] It should be noted that the power supply circuit integrates a rectifier and filter module, a discharge circuit, and a voltage detection circuit; The rectifier and filter module includes a rectifier bridge and a filter capacitor. The rectifier bridge adopts a full-bridge rectifier design, with an input voltage range of 85-264VAC and an output ripple of ≤50mV.

[0026] The filter capacitor is a low ESR (equivalent series resistance) electrolytic capacitor with a capacitance ≥1000μF to suppress high-frequency noise.

[0027] The discharge circuit includes an optocoupler, a bidirectional thyristor, and a discharge resistor; Optocoupler bidirectional thyristor: Model MOC3041, trigger current ≤15mA, off-state voltage ≥600V.

[0028] Discharge resistor: connected in parallel across the filter capacitor, with a resistance of 10kΩ and a power of 1W. It is disconnected via optocoupler control during normal power supply.

[0029] The voltage detection circuit includes a voltage divider resistor network and overvoltage / undervoltage protection; Voltage divider resistor network: Divides the input voltage to a range of 0-3.3V for ADC sampling.

[0030] Overvoltage / undervoltage protection: Set a threshold (e.g., error within 10% of rated voltage), and the main power supply will be cut off via a relay when triggered.

[0031] It should be noted that the RFID module is located inside the refrigerator; The RFID module has a dynamic load identification function, which can collect the radio frequency signal fluctuations of components such as refrigerator compressor and evaporator in real time, analyze their impedance change characteristics, and determine the current load status (such as high / medium / low load). It should be noted that, under the dynamic load identification function, the RFID module integrates an antenna array, a signal processing unit, a dynamic impedance analysis unit, a load status classifier unit, and a three-dimensional positioning algorithm unit. in: Antenna array: A 4×4 planar helical antenna is used to cover the main areas inside the refrigerator, such as the compressor compartment, evaporator compartment and freezer compartment. It supports 2.4GHz / 5.8GHz dual-band signal acquisition and sets the sampling frequency. According to the refrigerator compressor operating frequency (usually 50-100Hz), the RFID module sampling frequency is set to 500Hz to ensure that the complete impedance change cycle is captured. Signal processing unit: integrates high-speed ADC (sampling rate ≥1GSPS) and FPGA (Field Programmable Gate Array) to realize real-time digitization and preprocessing of radio frequency signals; and performs noise suppression by using wavelet transform denoising algorithm to eliminate electromagnetic interference inside the refrigerator, such as inverter noise and motor sparks.

[0032] Dynamic Impedance Analysis Unit: Extracts the amplitude-frequency characteristics of radio frequency signals through Fast Fourier Transform (FFT) to identify the impedance change patterns of components such as compressors and evaporators; The amplitude spectrum of the radio frequency signal is extracted by FFT to identify the spectral characteristics of the compressor in the states of startup, operation, and shutdown; the phase angle change of the impedance is calculated to determine the impact of the degree of evaporator frosting on the load.

[0033] Load status classifier unit: It adopts the support vector machine (SVM) algorithm to classify the load status into three levels: high, medium and low, based on impedance characteristics, with a classification accuracy of ≥95%; Twelve-dimensional features, including impedance amplitude, phase angle, and rise time, are extracted and reduced to three dimensions using Principal Component Analysis (PCA). An SVM algorithm is employed, using historical data (e.g., 1000 samples) to train the classifier and optimize kernel function parameters (e.g., γ=0.1, C=10 for the RBF kernel). The classifier is dynamically optimized by receiving model updates from the cloud via a Wi-Fi module.

[0034] Three-dimensional positioning algorithm unit: Based on hybrid positioning technology of time difference of arrival (TDOA) and angle of arrival (AOA), combined with Kalman filtering algorithm, the positioning accuracy of signal source is improved to within 5cm. The antenna array is used to collect radio frequency signals, analyze their impedance change characteristics, determine the current load status, and use a three-dimensional positioning algorithm to generate a three-dimensional spatial model to locate the signal source. The 3D positioning algorithm unit works in conjunction with the load state classifier (SVM) to accurately identify the placement location and type of different items.

[0035] It should be noted that the RFID module has an adaptive power supply regulation function; The RFID module integrates a PWM control algorithm, which includes: PID control: Based on load status feedback, the PWM duty cycle is adjusted through a proportional-integral-derivative (PID) algorithm to achieve a smooth transition of the output voltage.

[0036] Dead time setting: To avoid shoot-through between upper and lower bridge arms, the dead time is set to 1μs.

[0037] Dynamic voltage regulation: At low loads, copper and iron losses are reduced by lowering the output voltage, thereby improving the energy efficiency ratio (EER).

[0038] Frequency adaptive: The output frequency is dynamically adjusted according to the compressor speed requirements to avoid overload or underload operation.

[0039] The PWM control algorithm is directly integrated into the RFID module, rather than being uniformly scheduled by the main controller in the traditional way. This allows the power output to be adaptively adjusted at the millisecond level according to the real-time identified load characteristics, significantly improving the energy efficiency ratio. This architecture upgrades RFID from a simple "identification" tool to a "smart power regulation hub".

[0040] It should be noted that the RFID module has a protection mechanism. Under the protection mechanism, the RFID module works in conjunction with the main control circuit and the power supply circuit. It includes overvoltage / undervoltage protection, overcurrent protection, temperature protection, and fault diagnosis and recovery; Configure overvoltage / undervoltage protection scheme: Hardware protection: The input voltage is monitored in real time by a voltage detection circuit. When the voltage exceeds the threshold (e.g., 264VAC) or falls below the threshold (e.g., 85VAC), a relay is triggered to cut off the main power supply.

[0041] Software protection: The main control circuit checks the voltage every 10ms, and if it exceeds the limit three times in a row, the protection process will be activated.

[0042] Configure an overcurrent protection scheme: Current sampling: A Hall current sensor (such as ACS712) is used with a sampling frequency of 1kHz.

[0043] Threshold setting: Based on the compressor's rated current (e.g., 4A), set the overcurrent threshold to 6A and the trigger time to ≤50ms.

[0044] Temperature sensors for temperature protection: NTC thermistors are placed in key locations such as compressors and power modules. Thermistors with an accuracy error within 1℃ can be selected.

[0045] Graded protection: Level 1 protection (80℃): Reduces PWM duty cycle and forces air cooling.

[0046] Level 2 protection (90℃): Cuts off the main power supply and triggers an alarm via buzzer.

[0047] Fault Diagnosis and Recovery Fault codes: Define 10 fault types (such as overvoltage, undervoltage, overcurrent, and overtemperature), and push alarm information via LED indicator and Wi-Fi.

[0048] Self-recovery mechanism: For transient faults (such as voltage fluctuations), power supply is automatically restored after the fault disappears; for permanent faults, manual reset is required.

[0049] The system integrates a Hall current sensor and a temperature sensor in the power supply circuit, combined with a buzzer alarm and an optocoupler bidirectional thyristor discharge circuit, to construct a complete closed loop of "sensing, analysis, decision-making, execution, and feedback", realizing active power-off protection and energy consumption optimization for abnormal loads (such as doors not being closed tightly or foreign objects blocking the way).

[0050] Working principle of this embodiment: In use: S1: The RFID module monitors radio frequency signals, generates a tag data information table, and sorts the tags by signal strength (RSSI).

[0051] S2: The main control circuit combines the three-dimensional spatial model and sorting data to calculate the optimal power supply parameters.

[0052] S3: The power supply circuit performs regulation, and the voltage detection circuit provides real-time feedback to the main control circuit to form a closed-loop control.

[0053] The RFDD module collects real-time radio frequency signal fluctuations from components such as the refrigerator compressor and evaporator, analyzes their impedance change characteristics, determines the current load status, and dynamically adjusts the output voltage and frequency based on the load status. For example, it reduces the power supply intensity under low load to reduce unnecessary energy consumption. When abnormal fluctuations are detected, it automatically switches to backup power or triggers the equipment protection mode.

[0054] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A refrigerator power control system based on RFID technology, comprising a main control circuit and a power supply circuit, characterized in that, An RFID module is also provided between the main control circuit and the power supply circuit; The main control circuit integrates the core chip, communication interface, Wi-Fi module and power management unit; The power supply circuit integrates a rectifier and filter module, a discharge circuit, and a voltage detection circuit. The RFID module integrates an antenna array, a signal processing unit, a dynamic impedance analysis unit, a load status classifier unit, and a three-dimensional positioning algorithm unit.

2. The refrigerator power control system based on RFID technology as described in claim 1, characterized in that: The core chip uses a 32-bit ARM Cortex-M7 processor, and the communication interface adopts a CAN bus to communicate with the refrigerator's main control board and transmit load status commands and power supply parameters.

3. A refrigerator power control system based on RFID technology as described in claim 1, characterized in that: The power management unit integrates an LDO (low dropout linear regulator) and a DC-DC converter.

4. A refrigerator power control system based on RFID technology as described in claim 1, characterized in that: The rectifier and filter module includes a rectifier bridge and a filter capacitor, and the discharge circuit includes an optocoupler bidirectional thyristor and a discharge resistor.

5. A refrigerator power control system based on RFID technology as described in claim 1, characterized in that: The voltage detection circuit includes a voltage divider resistor network and overvoltage / undervoltage protection.

6. A refrigerator power control system based on RFID technology as described in claim 1, characterized in that: The signal processing unit integrates a high-speed ADC, FPGA, and wavelet transform denoising algorithm.

7. A refrigerator power control system based on RFID technology as described in claim 1, characterized in that: The dynamic impedance analysis unit integrates the Fast Fourier Transform (FFT) algorithm.

8. A refrigerator power control system based on RFID technology as described in claim 1, characterized in that: The load state classifier unit employs the Support Vector Machine (SVM) algorithm.

9. A refrigerator power control system based on RFID technology as described in claim 1, characterized in that: The RFID module integrates a PWM control algorithm.

10. A refrigerator power control system based on RFID technology as described in claim 1, characterized in that: The power supply circuit integrates a Hall current sensor, a temperature sensor, and a buzzer.

Images