Ringing Voltage Detection Circuit Using Peak-Hold Subtraction
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Solution Overview
Problem
Existing in-vehicle motor power transducers experience large drive voltage fluctuations, leading to surge voltages and ringing voltages that can cause equipment damage and electromagnetic interference (EMI) noise, making it difficult to detect and control these voltages separately.
Innovation Solution
An electronic circuit comprising a first peak-hold circuit to output a surge voltage free of ringing components, a second peak-hold circuit to output a surge voltage with ringing components, and a subtractor to subtract the outputs of the first and second peak-hold circuits, allowing for the detection and isolation of the ringing voltage for feedback control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a circuit is used to detect surge voltage, then surge voltage detection is enabled, but ringing voltage cannot be detected separately because it is superimposed on the surge voltage
Solution Approach 1:
The patent divides the detection of composite voltage into two separate detection paths: one path detects the surge voltage component while the other detects the ringing voltage component. By segmenting the detection function, the patent enables separate measurement of surge voltage and ringing voltage that were previously superimposed and indistinguishable.
Solution Approach 2:
The patent introduces an intermediary processing mechanism that separates the superimposed voltage signals. Through mathematical processing of voltages from different detection circuits, the patent extracts and isolates the ringing voltage component from the composite surge voltage signal.
2Reliability
If surge voltage and ringing voltage are detected separately, then feedback control for reducing ringing voltage becomes possible, but the circuit complexity increases
Solution Approach 1:
The patent designs detection circuits that serve multiple functions: detecting both surge voltage and ringing voltage components, providing feedback control signals, and enabling evaluation of voltage characteristics. This multi-functionality reduces the need for separate dedicated circuits for each function.
Solution Approach 2:
The patent implements feedback control mechanisms where the separately detected ringing voltage is used to generate control signals that can reduce or suppress ringing effects. This feedback loop improves system reliability by actively mitigating voltage anomalies rather than merely detecting them.
Data Source
AI summary
An electronic circuit includes a first peak-hold circuit to output a peak surge voltage free of a ringing component included in a voltage at a voltage input node, a second peak-hold circuit to output a peak surge voltage on which the ringing component included in the voltage at the voltage input node is superimposed, and a subtractor to subtract an output voltage of the first peak-hold circuit from an output voltage of the second peak-hold circuit to output a voltage of the ringing component.