Magnetron Current Path Shielding to Prevent AFCI False Trips
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Solution Overview
Problem
Microwave ovens often incorrectly recognize noise currents as arc faults, leading to unnecessary power interruptions due to the frequency components of currents flowing from the magnetron to the high-voltage capacitor and transformer, which can result in unstable operation.
Innovation Solution
A magnetic body is arranged to surround the current path connecting the magnetron to the high-voltage capacitor, diode, and transformer, reducing noise generation and misrecognition by the arc fault circuit interrupter (AFCI).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the AFCI monitors the current path to detect arc faults, then safety is improved, but false detection of noise currents as arc faults causes unnecessary power interruptions
Solution Approach 1:
A magnetic body is introduced as an intermediary component surrounding the current path between the magnetron and high-voltage components. This magnetic body acts as a mediator that suppresses noise currents generated by the magnetron operation, preventing these noise currents from being detected by the AFCI as arc faults, thereby reducing false interruptions while maintaining safety monitoring
Solution Approach 2:
The invention converts the harmful noise currents generated by the magnetron into a controlled magnetic field within the magnetic body. By containing and suppressing these noise currents through the magnetic body, the harmful electromagnetic interference is transformed into a localized magnetic effect that does not interfere with AFCI operation, eliminating false arc fault detections
2Power
If the magnetron generates high-power microwaves, then cooking performance is improved, but noise currents are generated that cause AFCI misrecognition
Solution Approach 1:
The magnetic body serves as an intermediary that intercepts and suppresses noise currents generated by the high-power magnetron operation. By placing this magnetic body along the current path, the noise currents are contained and suppressed before they can propagate to the AFCI, allowing the magnetron to operate at high power without generating harmful electromagnetic interference
Solution Approach 2:
The magnetic body changes the electromagnetic parameters of the current path by introducing magnetic permeability that suppresses high-frequency noise currents. This parameter change allows the system to maintain high-power microwave generation while filtering out the harmful noise frequency components that would otherwise cause AFCI misrecognition
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
The magnetic body effectively suppresses noise currents and reduces misrecognition by the AFCI, ensuring stable operation of the microwave oven by preventing unnecessary power interruptions.
Implementation Method 1
a magnetic body arranged adjacent to a current path connecting the magnetron to the high-voltage capacitor, the high-voltage diode, and the high-voltage transformer... the magnetic body surrounds the current path
Data Source
AI summary
A microwave oven is provided. The microwave oven includes a main body including a cooking chamber having an opening that is opened forward, and door coupled to the main body and capable of opening/closing the cooking chamber, a magnetron that generates microwaves and is connected to a second side of the cooking chamber, the second side being opposite to a first side to which the door is coupled, a high-voltage capacitor connected to the magnetron, a high-voltage diode connected to the magnetron, a high-voltage transformer connected to the magnetron, and a magnetic body arranged adjacent to a current path connecting the magnetron to the high-voltage capacitor, the high-voltage diode, and the high-voltage transformer, wherein, along the current path, a current flows from the magnetron to the high-voltage capacitor, the high-voltage diode, and the high-voltage transformer, and wherein the magnetic body surrounds the current path.