Current-Spinning Hall Sensor Circuit for Ripple Cancellation

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Solution Overview

Problem

Conventional magnetic field sensors using Hall Effect elements in current spinning and chopping arrangements suffer from reduced bandwidth and response time due to the generation of undesirable spectral components, which are typically addressed using filters or feedback circuits that further limit performance.

Innovation Solution

A magnetic field sensor design that incorporates an N-phase modulator, a primary circuit path with a combining module, and a ripple reduction feedback network to generate and process N-phase modulated signals, effectively canceling undesirable frequency components while maintaining a wider bandwidth and faster response time.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If filters are used to remove undesirable spectral components, then measurement precision is improved, but bandwidth is reduced

Engineering Contradiction:

Improvespectral component removalVSAvoidbandwidth

Core Design Contradiction:

Measurement precisionVSSpeed

Solution Approach 1:

The patent implements feedback circuits that detect undesirable spectral components (ripple) generated by current spinning and chopping operations, and automatically generate corrective signals to cancel these components. This active feedback mechanism removes spectral impurities without requiring passive filters that would limit bandwidth, thus resolving the contradiction between measurement precision and speed.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent introduces intermediary ripple reduction circuits that act as mediators between the signal generation stage and the output stage. These circuits process the signal to eliminate undesirable spectral components through intermediate processing steps, achieving spectral purification without the bandwidth constraints of traditional filtering approaches.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If feedback circuits are used to remove undesirable spectral components, then measurement precision is improved, but response time is reduced

Engineering Contradiction:

Improvespectral component removalVSAvoidresponse time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent applies preliminary action by implementing ripple reduction feedback circuits that continuously monitor and correct undesirable spectral components in real-time during operation. By proactively eliminating spectral impurities as they are generated, the system maintains measurement precision without the time delays associated with post-processing filters.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The feedback mechanism operates continuously to detect and cancel ripple components, ensuring that measurement precision is maintained without introducing significant time delays. The feedback loop is designed to respond rapidly to spectral variations, minimizing response time while achieving effective spectral component removal.

Inventive Principle:

Principle #23Feedback

3Measurement precision

If current spinning is used to reduce DC offset voltage, then measurement precision is improved, but undesirable spectral components are generated

Engineering Contradiction:

ImproveDC offset reductionVSAvoidundesirable spectral components

Core Design Contradiction:

Measurement precisionVSObject-generated harmful factors

Solution Approach 1:

The patent converts the harmful effect of current spinning by using the generated spectral components as feedback signals. The ripple reduction circuits detect these undesirable spectral components and generate corrective signals that cancel them, effectively transforming the harm into a useful feedback mechanism that improves overall signal quality while maintaining the DC offset reduction benefits of current spinning.

Inventive Principle:

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

Solution Approach 2:

The patent employs feedback to counteract the harmful spectral components generated by current spinning. By monitoring the output for ripple components and automatically generating corrective signals, the system eliminates the harmful effects of current spinning while preserving its beneficial DC offset reduction capability, thus resolving the contradiction between measurement precision and harmful factor generation.

Inventive Principle:

Principle #23Feedback

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The proposed solution enables the magnetic field sensor to reduce undesirable spectral components without the bandwidth limitations of traditional filters, resulting in improved performance with wider bandwidth and faster response times.

Implementation Method 1

Hall Effect elements generate an output voltage proportional to a magnetic field

Methodology Applied

Scientific EffectHall Effect: Hall Effect

Data Source

PatentUS11047933B2Fast response magnetic field sensors and associated methods for removing undesirable spectral components

Publication Date: 2021.06.29 ALLEGRO MICROSYSTEMS LLC

AI summary

Magnetic field sensors and associated techniques use a Hall effect element in a current spinning arrangement in combination with a rippled reduction feedback network configured to reduce undesirable spectral components generated by the current spinning and other circuit elements.