Power Supply Identification Using Harmonic Thresholds
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Solution Overview
Problem
Conventional methods for identifying the source of power supply in electronic devices, such as using harmonic extraction and magnitude calculation, are complex and time-consuming, leading to potential incorrect operation or failure due to resource allocation during control cycles.
Innovation Solution
An input power supply management apparatus that measures input voltage, generates an approximate fundamental wave using a fundamental wave table, calculates index values and variances based on differences between the input voltage and the approximate wave, and identifies the power source within a single control cycle using a controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional harmonic extraction and magnitude calculation methods are used to identify power supply source, then measurement precision is improved, but loss of time increases and device complexity increases
Solution Approach 1:
The patent extracts only the essential characteristic needed for power supply identification - the presence of specific harmonic frequencies (5th, 7th, 11th, 13th harmonics) - rather than performing complete harmonic analysis. By extracting only these key frequency components and comparing their magnitudes against predetermined thresholds, the system achieves accurate identification without the computational burden of full spectral analysis.
Solution Approach 2:
The identification process is segmented into discrete frequency component detections (5th harmonic, 7th harmonic, 11th harmonic, 13th harmonic) rather than continuous analysis. Each harmonic component is detected and evaluated independently against threshold values, allowing the system to process multiple frequency components in parallel and reach a conclusion within a single control cycle.
2Measurement precision
If conventional harmonic extraction and magnitude calculation methods are used to identify power supply source, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent employs simple threshold comparison operations instead of complex continuous calculations. The system uses predetermined threshold values for each harmonic component and performs discrete comparisons, which are computationally inexpensive operations that can be executed quickly by microcontrollers with limited processing power.
Solution Approach 2:
The patent transforms the identification problem from continuous parameter analysis to discrete parameter comparison. By converting the continuous harmonic magnitude values into discrete binary decisions (above or below threshold), the system simplifies the computational requirements while maintaining identification accuracy.
3Measurement precision
If complex calculations are performed during control cycle to identify power supply source, then measurement precision is improved, but productivity decreases
Solution Approach 1:
The patent performs power supply identification at specific periodic intervals synchronized with the control cycle, rather than continuously. The identification is triggered periodically and completes within the control cycle timeframe, ensuring that basic device functions are not disrupted while maintaining accurate power source awareness.
Solution Approach 2:
The patent pre-calculates and stores threshold values for each harmonic component during system design or initialization. These predetermined thresholds are prepared in advance, eliminating the need for complex real-time calculations during operation. The system only needs to compare measured harmonic magnitudes against these pre-established criteria.
Data Source
AI summary
A method for managing an input power supply of an electronic device includes measuring an input voltage that is input from an input power supply; generating an approximate fundamental wave with respect to the input voltage using a maximum value of the input voltage and values of a fundamental wave; calculating at least one of an index value or an index variance with respect to the input power supply using differences between the input voltage and the approximate fundamental wave; and identifying a type of the input power supply based on the at least one of the index value and the index variance. When the input power supply is identified as an uninterruptable power supply, the electronic device may be controlled to operate in a minimum power consumption mode.