Power Conversion Device Noise-Resistant Phase Calculation
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Solution Overview
Problem
Existing power conversion technologies inaccurately calculate phase and frequency due to noise interference in detected current or voltage signals, leading to unreliable motor control.
Innovation Solution
A power conversion device with a linear function conversion unit, gradient and intercept extraction units, filter processing units, and a phase inverse conversion unit to remove noise and accurately calculate phase, comprising a semiconductor switching element for converting DC or AC voltage to arbitrary AC voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phase and frequency are calculated based on detected current or voltage signals, then motor control can be implemented, but noise in the detected signals causes inaccurate phase and frequency calculation
Solution Approach 1:
The patent introduces an intermediary processing system that includes gradient extraction, linear function conversion, and filter processing units. These intermediary components process the detected signals through multiple transformation stages, extracting gradients and applying filtering to eliminate noise before final phase calculation, thereby resolving the contradiction between utilizing detected signals and eliminating their noise content
Solution Approach 2:
The patent replaces direct phase calculation from noisy signals with a computational processing system that uses gradient extraction and filter processing. This substitution transforms the direct measurement approach into a multi-stage computational approach, where mathematical operations (gradient extraction, linear function conversion) replace direct signal interpretation, effectively filtering noise through computational rather than physical means
2Measurement precision
If filter processing is applied to remove noise from detected signals, then phase calculation accuracy improves, but system complexity increases
Solution Approach 1:
The patent segments the phase calculation process into distinct functional modules: gradient extraction unit, linear function conversion unit, filter processing unit, and phase calculation unit. Each module performs a specific function, allowing the complex noise filtering task to be divided into manageable stages. This segmentation improves measurement precision through systematic filtering while organizing system complexity into modular, maintainable components
Solution Approach 2:
The patent introduces intermediary processing units (gradient extraction, linear function conversion) that mediate between the detected signals and the final phase calculation. These intermediary layers add computational steps that improve accuracy but also increase system complexity. The intermediary structure allows for precise control at each processing stage, enabling accurate phase measurement through multiple transformation steps
Data Source
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AI summary
A power conversion device for accurately calculating phase even if noise is mixed in a detected or estimated electric signal is provided. The power conversion device includes a linear function conversion unit for converting a detected or estimated electric signal to a linear function representing a time displacement of the phase of the electric signal, a gradient extraction unit and an intercept extraction unit for extracting a gradient and an intercept from the linear function obtained by conversion by the linear function conversion unit, a gradient filter processing unit and an intercept filter processing unit for performing filter processing on the gradient and the intercept extracted by the gradient extraction unit and the intercept extraction unit, a linear function inverse conversion unit for regaining a linear function using the gradient and the intercept on which the filter processing has been performed by the gradient filter processing unit and the intercept filter processing unit, and a phase inverse conversion unit for inversely converting the linear function inversely converted by the linear function inverse conversion unit to a time displacement of the phase, wherein the output voltage of the power conversion device is controlled using a inversely converted phase obtained by inverse conversion by the phase inverse conversion unit.