Resolver Quadrant Detection With Precision Rectifier Signal Paths
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Solution Overview
Problem
Conventional resolver systems inefficiently utilize the full analog to digital converter (ADC) dynamic range due to the need for bipolar signal swing, leading to loss of angle quadrant information when precision rectification is applied for unipolar signal swing.
Innovation Solution
A system employing precision rectifiers and a quadrant detection circuit to process high and low signals from sine, cosine, and exciter coils, enabling unipolar signal swing and full ADC dynamic range utilization while maintaining quadrant detection, using a processing device to interpret PWM signals for angular position and speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If bipolar signal swing is applied to ADC, then full ADC dynamic range is utilized, but angle quadrant information is lost when precision rectification is applied
Solution Approach 1:
The signal processing is segmented into two independent paths: one path processes the rectified unipolar signal for amplitude measurement, while the other path processes the original bipolar signal for quadrant detection. This segmentation allows each path to be optimized for its specific function without compromising the other.
Solution Approach 2:
The patent introduces an intermediary signal path that takes the original bipolar resolver signals and processes them through a separate channel to generate quadrant information. This intermediary path acts as a mediator that preserves quadrant data while the main path utilizes precision rectification for amplitude measurement.
2Measurement precision
If precision rectification is applied to achieve unipolar signal swing, then full ADC dynamic range is utilized, but angle quadrant information is lost
Solution Approach 1:
The system segments the signal processing into distinct functional paths: one for precision rectification and amplitude measurement, and another for quadrant detection using the original bipolar signals. This allows full ADC dynamic range utilization while preserving quadrant information.
Solution Approach 2:
An intermediary processing path is introduced that receives the original bipolar resolver signals and extracts quadrant information independently. This intermediary mechanism ensures that quadrant data is captured before precision rectification eliminates the sign information.
3Measurement precision
If full bipolar signal swing is applied to ADC, then ADC dynamic range is effectively used, but only half of the signal swing is sufficient to determine amplitude
Solution Approach 1:
The patent segments the signal processing to apply precision rectification specifically for amplitude determination, converting the bipolar signal to unipolar form. This allows the full ADC dynamic range to be utilized for amplitude measurement while a separate path handles quadrant detection.
Solution Approach 2:
The patent changes the signal parameter from bipolar to unipolar through precision rectification, enabling full utilization of the ADC's dynamic range for amplitude measurement. This parameter transformation is applied selectively to the amplitude measurement path while preserving the original signal for quadrant detection.
Data Source
AI summary
A system includes first precision rectifier operatively connected to receive high and low signals of a sine coil of a resolver and to output a first signaled condition and an exciter coil of the resolver. A second precision rectifier is operatively connected to receive high and low signals of a cosine coil of the resolver and to output a second signaled condition. A quadrant detection circuit operatively connected to receive high and low signals of the exciter coil of the resolver, high and low signals from the sine coil, and high and low signals from the cosine coil. The quadrant detection circuit outputs a signal indicative of quadrant position of the resolver.