Resolver Signal Inversion for Accurate Angle Detection
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Solution Overview
Problem
Resolver to digital converters in harsh environments face errors due to non-linearity in analog to digital conversion of sine and cosine wave signals, affecting the accuracy of electrical angle detection.
Innovation Solution
Incorporating a switching circuit to invert at least one of the sine or cosine wave signals before conversion, ensuring the signals input to the A/D converter are closer in phase and value, thereby reducing the impact of non-linearity errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sine and cosine wave signals are alternately selected by a multiplexer for A/D conversion, then the device complexity is reduced, but measurement precision deteriorates due to non-linearity errors in the A/D converter
Solution Approach 1:
The switching circuit performs preliminary inversion of the sine or cosine wave signal before the signals are selected by the multiplexer and input to the A/D converter. This preliminary action ensures that the signals are in a more favorable state for conversion, reducing the impact of non-linearity errors and improving angle detection accuracy while maintaining the simple sequential conversion structure
Solution Approach 2:
The switching circuit changes the phase parameter of the sine or cosine wave signal by inverting it when necessary. This parameter change makes the signals closer in phase and value, which reduces the non-linearity error impact during A/D conversion and improves measurement precision without increasing device complexity
Data Source
AI summary
In a semiconductor device, a sine wave signal is input to a first input part and a cosine wave signal is input to a second input part. A multiplexer alternately selects one of the sine wave signal and the cosine wave signal. An analog to digital converter converts the output signal of the multiplexer into a digital value. A switching circuit is coupled between at least one of the first and second input parts and the multiplexer. The switching circuit is configured to be able to invert the input sine wave signal or the input cosine wave signal, in order to reduce the angle detection error due to the non-linearity error of the A/D converter.