Microwave Inverter Power Control via Lookup Table
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Solution Overview
Problem
Conventional methods for adjusting power levels in microwave ovens with inverter systems face challenges due to nonlinear relationships between power levels, leading to deviations in output power and potential damage to the magnetron, as they rely on coefficient weighted corrections that are difficult to determine accurately.
Innovation Solution
A system and method that utilize a storage module to store an index table of periodic counting values and identification numbers, allowing a control module to look up corresponding periodic counting values for power requests and output frequency signals to adjust the inverter power, thereby avoiding coefficient weighted corrections and maintaining the magnetron within a normal power range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If coefficient weighted correction is applied to adjust power levels, then full power (P100) can be adjusted to normal range, but other power levels (P90, P80, P70, P60, P50) will exceed normal fluctuation range
Solution Approach 1:
The patent divides the power adjustment process into two independent segments: P100 adjustment using coefficient weighted correction, and other power levels (P90-P50) adjustment using lookup table with periodic counting values. This segmentation allows each segment to be optimized independently, resolving the contradiction between full power accuracy and other power levels stability.
Solution Approach 2:
The patent introduces a lookup table as an intermediary mechanism that stores pre-calibrated periodic counting values for different power levels. This intermediary allows the system to bypass the nonlinear coefficient weighted correction for P90-P50, directly providing stable power levels without exceeding normal fluctuation ranges.
2Weight of moving object
If inverter is used instead of transformer power source, then lightweight and high power factor are achieved, but electronic parameter errors cause output power to greatly deviate from actual value
Solution Approach 1:
The patent implements a feedback mechanism where the actual output power of the inverter is measured and compared with the target power value. Based on the deviation, the system adjusts the periodic counting values in the lookup table and modifies the power control signals to compensate for electronic parameter errors, ensuring output power accuracy despite using lightweight inverter components.
3Adaptability or versatility
If conventional coefficient weighted correction is used to adjust power levels, then power difference can be adjusted, but nonlinear relationships make it difficult to determine weighted correction coefficient
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing the optimal periodic counting values for each power level (P100, P90, P80, P70, P60, P50) in the lookup table during the manufacturing calibration process. This eliminates the need for complex real-time coefficient calculations during operation, simplifying the control system while maintaining full power level adaptability.
Data Source
AI summary
A system and a method for adjusting a power of an inverter of a microwave oven, and a microwave oven are provided. The system (100) includes: a storage module (101), configured to store an index table comprising periodic counting values and identification numbers; a control module (102), configured to look up an identification number corresponding to a power request signal in the index table according to the power request signal, to look up a periodic counting value corresponding to the identification number in the index table, and to output a frequency signal according to the periodic counting value; and a communication module (104), configured to output a power control signal to the inverter (106) of the microwave oven according to the frequency signal. The inverter (106) outputs a power to a magnetron (108) of the microwave oven according to the power control signal.