Flow Meter IC Conditioning for High-Amplitude Oscillation Blocking

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Solution Overview

Problem

Integrated circuits processing oscillating analog signals from inductive-capacitive sensors face faults due to high-amplitude oscillations, which existing solutions like voltage limitation or electrostatic discharge diodes either constrain design flexibility or are costly.

Innovation Solution

An integrated circuit with an input/output cell and control circuit that eliminates the first oscillation with an amplitude greater than a threshold, preventing it from being transmitted to the processing unit, using a switch controlled by both a main and auxiliary circuit to ensure compatibility with the processing unit's voltage tolerance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If voltage limitation is used to compensate for overvoltage from first oscillations, then the processing unit is protected from faults, but design flexibility is limited and alternative functionalities with different power ranges cannot be implemented

Engineering Contradiction:

Improveprocessing unit protectionVSAvoiddesign flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The control circuit detects the first oscillation before it reaches the processing unit and activates the switch to disconnect the input signal in advance. This preliminary action prevents the high-amplitude signal from causing faults while allowing the system to later enable alternative functionalities without voltage limitation constraints.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The switch is dynamically controlled by the control circuit to connect or disconnect the input signal based on real-time detection of oscillation amplitude. This dynamic control allows the system to adapt between protection mode and flexible functionality mode, resolving the contradiction between reliability and adaptability.

Inventive Principle:

Principle #15Dynamics

2Reliability

If electrostatic discharge diodes are used for protection against overvoltage, then the processing unit is protected from faults, but the solution becomes costly

Engineering Contradiction:

Improveprocessing unit protectionVSAvoidcost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The control circuit acts as an intermediary between the input signal and the processing unit. It detects high-amplitude oscillations and controls the switch to block harmful signals, providing protection through intelligent control rather than passive protective components like ESD diodes, thereby reducing cost while maintaining reliability.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces the mechanical/passive protection approach (ESD diodes) with an electronic control system consisting of a control circuit and switch. This substitution provides equivalent or superior protection functionality at lower cost by using active electronic control instead of passive protective components.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Loss of information

If the first oscillation with strong amplitude is transmitted to the processing unit, then signal integrity is maintained, but faults occur in the electronic components

Engineering Contradiction:

Improvesignal integrityVSAvoidcomponent fault risk

Core Design Contradiction:

Loss of informationVSReliability

Solution Approach 1:

The control circuit extracts and identifies the harmful first oscillation from the input signal based on its characteristic amplitude, and selectively removes it by controlling the switch to disconnect during this period. This extraction approach preserves the integrity of subsequent useful oscillations while eliminating only the harmful component.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The control circuit uses the high amplitude characteristic of the first oscillation (which is harmful) as a detection signal to trigger protection action. By converting this harmful characteristic into a detectable feature, the system can identify and block the harmful oscillation, turning its problematic property into a useful detection mechanism.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS11680835B2Conditioning integrated circuit for an inductive-capacitive flow meter

Publication Date: 2023.06.20 STMICROELECTRONICS (ROUSSET) SAS

AI summary

An oscillating analog signal includes a succession of dampened oscillations. That oscillating analog signal is conditioned to generate an output signal including only oscillations of the oscillating analog signal which have an amplitude smaller than a first threshold. The output signal is then processed by a processing unit, where the first threshold is compatible with a maximum level of voltage tolerable by the processing unit.