Digital Power Control Bandwidth Verification via Phase Lead Compensation
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Solution Overview
Problem
Current methods for measuring the bandwidth and phase of digital power control systems are prone to measurement errors due to noise, are complex, and cannot accurately utilize digital systems for frequency-response characterization, leading to a lack of systematic design and verification in compensator design for closed-loop control systems.
Innovation Solution
A method involving A/D conversion, phase lead compensator design based on sampling frequencies and time delay parameters, and mixed wave calculation units to facilitate direct measurement of the Bode diagram through a digital system, enabling accurate phase compensation and system data acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a signal generator is used for measurement, then no expensive instrument is required, but measurement error significantly increases due to excessive noise and the measurement becomes more complicated
Solution Approach 1:
The patent introduces a frequency response analyzer as an intermediary device between the signal generator and the system under test. This analyzer processes the signals and provides accurate frequency response measurements, eliminating the measurement errors that would otherwise occur when using only a signal generator without expensive additional equipment
2Measurement precision
If the number of measured frequency points increases, then measurement accuracy improves, but the time spent increases increasingly
Solution Approach 1:
The patent employs periodic sweeping through frequency points using the frequency response analyzer, systematically varying the frequency in a controlled periodic manner. This allows comprehensive measurement of multiple frequency points while optimizing the measurement process to reduce total time compared to non-systematic approaches
3Speed
If Fast Fourier Transform is used in frequency response analyzer, then operation speed is fast, but sampling is limited and generally available only in high frequency analysis
Solution Approach 1:
The patent implements a dynamic measurement approach where the frequency response analyzer can adapt its sampling strategy based on the specific measurement requirements. The system dynamically adjusts between FFT-based fast measurement for high frequencies and other methods for lower frequencies, making the system versatile across different frequency ranges while maintaining speed where applicable
4Measurement precision
If Discrete Fourier Transform is used in frequency response analyzer, then detection result is not easily interfered, but it takes much more time to test
Solution Approach 1:
The patent applies discrete Fourier transform selectively for critical frequency points where high accuracy is essential, while using faster methods for less critical measurements. This partial application of the more time-consuming but accurate DFT method optimizes the balance between detection accuracy and test time by not applying it excessively to all measurements
5Ease of manufacture
If analog readback signals are used, then measurement can be performed, but digital power control system with microprocessor or digital circuit cannot be used or used to accurately test frequency-response characteristics
Solution Approach 1:
The patent replaces analog readback signal mechanisms with digital signal processing. The frequency response analyzer interfaces directly with the digital power control system's microprocessor or digital circuit, substituting analog signal paths with digital communication and processing. This enables accurate frequency-response characterization of digital systems while maintaining measurement capability
Data Source
AI summary
A method for verifying the bandwidth and phase of a digital power control system according to the present invention includes steps of: A. Disturbance Order Reading in which an A/D conversion unit receives an analog signal order and mix it with existing command components in a digital system unit; B. Phase Delay Compensation in which a phase lead compensator is designed that is based on the different sampling frequencies and time delay parameters of the digital system unit, and the phase lead compensator is added to the digital system unit; and C. System Measuring in which a mixed wave calculation unit and a supply unit are added to the digital system unit to make the analog command signal pass through the digital system unit and the mixed wave calculation unit to the supply unit and to further drive a power circuit.