Frequency Converter Switching Accuracy via Feedback Calibration
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Solution Overview
Problem
Existing frequency converters face challenges in achieving high tracking accuracy without increasing switching frequency, leading to increased system switching loss due to total harmonic distortion caused by the switching strategy.
Innovation Solution
A frequency converter and switching method that utilizes a comparator, error computation unit, and calibration unit to receive a reference voltage signal and triangle wave signal, calculate an error signal, and calibrate the signals to enhance switching accuracy without increasing switching frequency, thereby reducing total harmonic distortion and switching losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the switching frequency of the frequency converter is increased to improve tracking accuracy, then the tracking accuracy is improved, but the system switching loss is increased
Solution Approach 1:
The patent implements a feedback mechanism where the switching signal is fed back to calculate an error signal by computing the reference voltage signal and the switching signal. The triangle wave signal or reference signal is then calibrated according to the error signal, creating a closed-loop system that continuously adjusts to maintain high tracking accuracy without requiring increased switching frequency.
Solution Approach 2:
The patent calibrates the triangle wave signal or reference voltage signal according to the calculated error signal, effectively adjusting the parameters of these signals to minimize tracking error. This dynamic parameter adjustment allows the system to maintain high tracking accuracy at lower switching frequencies, thereby reducing switching losses.
2Manufacturing precision
If the switching frequency is increased to reduce total harmonic distortion, then the tracking accuracy is improved, but the switching loss increases
Solution Approach 1:
The switching signal is fed back to the error computation unit to calculate an error signal, which is then used by the calibration unit to adjust the triangle wave signal or reference voltage signal. This feedback loop enables the system to achieve high switching signal accuracy and reduce total harmonic distortion without increasing the switching frequency, thereby avoiding increased switching losses.
Solution Approach 2:
The calibration unit pre-adjusts the triangle wave signal or reference voltage signal based on the error signal before the next switching cycle begins. This preliminary calibration action ensures that the switching signal maintains high accuracy throughout operation, reducing total harmonic distortion without requiring higher switching frequencies that would increase switching losses.
Data Source
AI summary
A frequency converter includes a comparator, an error computation unit and a calibration unit. The comparator receives a reference voltage signal and a triangle wave signal, and outputs a switching signal. The switching signal is fed back to the error computation unit to calculate an error signal by computing the reference signal and the switching signal. The calibration unit calibrates the triangle wave signal or the reference voltage signal according to the error signal.