Magnetron Anode Current Pulse Width Detection for Load State
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Solution Overview
Problem
Existing domestic appliances with microwave functions face the risk of magnetron damage when there is a low or no liquid-containing medium present, as most microwave radiation is reflected back, potentially overheating the magnetron, and relying on load sensors is costly and prone to faults.
Innovation Solution
A domestic appliance that detects and evaluates the pulse width of the anode current of the magnetron to determine the load state, using the switched-mode power supply and control unit to assess and prevent damage by adjusting the magnetron's operation without additional sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If load sensors are used to detect low or non-existent loads, then the detection of reflected microwave radiation and magnetron temperature increase can be achieved, but the cost increases and the sensors become susceptible to faults
Solution Approach 1:
The magnetron's own anode current signal is used to detect load conditions. The control unit evaluates the anode current waveform characteristics (amplitude, pulse width) that naturally change when microwave radiation is reflected back, eliminating the need for separate load sensors. The system serves itself by using its operational parameters for both control and detection purposes.
Solution Approach 2:
The anode current signal acts as an intermediary that carries information about the load condition. By monitoring changes in the anode current waveform, the system indirectly detects the presence of reflected microwave radiation and potential magnetron overheating without requiring direct measurement sensors.
2Object-affected harmful factors
If additional load sensors are installed to detect reflected microwave radiation, then magnetron damage can be prevented, but the device complexity and cost increase
Solution Approach 1:
The control unit monitors the anode current waveform characteristics that naturally change when microwave radiation is reflected back. By evaluating parameters such as current amplitude and pulse width, the system detects load conditions and prevents magnetron damage using existing operational signals rather than additional sensors.
Solution Approach 2:
The system continuously monitors the anode current signal and uses this feedback to detect reflected microwave radiation. When the control unit identifies abnormal current patterns indicating high reflection, it adjusts magnetron operation or shuts it down to prevent damage, creating a closed-loop protection mechanism without additional hardware.
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
This approach allows for cost-effective and reliable detection of low or empty load states, preventing magnetron damage by adjusting power or operation mode, thus extending the appliance's lifespan without the need for separate load sensors.
Implementation Method 1
a magnetron configured to generate microwave radiation
Implementation Method 2
liquid contained in the foodstuff is set in motion by the microwave radiation so that the energy from the microwave radiation is converted into heat
Data Source
AI summary
A domestic appliance for heating a foodstuff includes: an interior space for receiving the foodstuff; a magnetron for generating microwave radiation; a switched-mode power supply for operating the magnetron; and a control unit for controlling the switched-mode power supply. The domestic appliance detects and evaluates a pulse width of an anode current of the magnetron.