RF Detection Device for Microwave Oven Load Analysis
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Solution Overview
Problem
Existing microwave oven detection methods, such as temperature, spectral, and infrared detection, are costly, complex, and limited in application scenarios, and often require contact with the load, which can damage the load or equipment and are susceptible to interference.
Innovation Solution
A radio frequency detecting device that generates and transmits multiple forward frequency signals of different frequencies, receives reflected signals, and uses microcontrollers to determine load parameters like type, volume, and temperature without contact, utilizing a power separation device and PI networks to improve safety and hygiene.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature detection, spectral detection, infrared detection, or imaging detection is used, then detection function is provided, but the cost is high, system complexity increases, and application scenarios are limited
Solution Approach 1:
The patent replaces complex mechanical/optical detection systems (spectral detectors, infrared sensors, imaging devices) with a radio frequency detection system that uses electromagnetic wave reflection principles. This substitution maintains detection functionality while dramatically reducing system complexity and cost by using simple RF signal generation and reception components instead of expensive specialized sensors.
Solution Approach 2:
The RF detection system is designed to detect multiple types of objects (food, liquid, metal, glass, plastic) using the same basic hardware platform. By sweeping through multiple frequencies and analyzing reflection characteristics, a single system can identify different material types and states, replacing the need for multiple specialized detection devices.
2Measurement precision
If contact detection is used, then detection accuracy is improved, but the load may be damaged or equipment may be affected
Solution Approach 1:
The patent introduces radio frequency electromagnetic waves as an intermediary between the detection system and the load. Instead of direct contact, the RF signals interact with the load through reflection, allowing detection of load properties (type, volume, temperature) without physical contact. This intermediary approach maintains detection accuracy while eliminating damage risks to both load and equipment.
3Device complexity
If single frequency detection is used, then device complexity is reduced, but detection adaptability to different scenarios is limited
Solution Approach 1:
The detection system dynamically adjusts the frequency of RF signals by sweeping through a range of frequencies rather than using a fixed single frequency. This dynamic frequency adjustment allows the system to adapt to different load types and detection scenarios automatically, improving versatility while keeping the hardware relatively simple through software-controlled frequency variation.
Solution Approach 2:
The system changes the frequency parameter of the detection signals to adapt to different detection needs. By varying the RF frequency and analyzing how different loads reflect signals at different frequencies, the system can identify various material types and states without requiring complex hardware changes, achieving high adaptability through parameter variation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables adaptable and accurate detection of load parameters across various scenarios, reducing the risk of damage to the load or equipment and improving detection speed and accuracy by using graphical comparisons and pre-stored maps.
Implementation Method 1
a signal transmitting device configured to sequentially generate and transmit multiple forward frequency detecting signals of different frequencies
Implementation Method 2
a signal receiver configured to receive multiple reverse frequency detecting signals reflected by the load
Data Source
AI summary
The present disclosure provides a radio frequency detecting device, a detecting method, and a microwave oven, and the radio frequency detecting device comprises: a signal transmitting device configured to generate and transmit multiple forward frequency detecting signals of different frequencies; a signal receiver configured to receive multiple reverse frequency detecting signals reflected by the load; a first detection device configured to detect each first parameter corresponding to each of the forward frequency detecting signals; a second detection device configured to detect each second parameter of each of the reverse frequency detecting signals; and a microcontroller configured to determine a state parameter of the load based on the multiple frequencies and the first parameter and the second parameter corresponding to each of the frequencies.