Magnetoresistive Current Detector for Voltage Converters

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Solution Overview

Problem

Current current detection methods in power electronics face challenges in achieving accurate and fast zero current detection, especially at high switching frequencies, which is crucial for efficient voltage converter operations.

Innovation Solution

A detector utilizing a magnetoresistive structure that varies resistance based on magnetic fields caused by currents, enabling fast and accurate current detection, including zero current detection, through a combination of a magnetoresistive structure and a detection unit.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional current detection methods are used, then the device complexity is reduced, but the measurement precision and temporal resolution are insufficient for high switching frequencies

Engineering Contradiction:

Improvetemporal resolution of current detectionVSAvoidcomplexity of detection system

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces conventional electrical current sensing methods with magnetic field-based detection using magnetoresistive structures. The current to be sensed generates a magnetic field that modulates the resistance of the magnetoresistive structure, enabling non-contact, high-precision measurement with temporal resolution suitable for megahertz switching frequencies.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent utilizes the resistance parameter of the magnetoresistive structure that changes in response to magnetic field strength. By detecting resistance variations caused by the magnetic field generated by the sensed current, the system achieves high temporal resolution current detection without direct electrical contact.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If faster current detection is implemented to meet high switching frequencies, then the productivity is improved, but the measurement precision may be compromised

Engineering Contradiction:

Improveswitching frequency capabilityVSAvoidaccuracy of zero current detection

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The magnetoresistive detection method provides both high speed response capability for megahertz switching frequencies and high measurement precision for accurate zero-current detection. The magnetic field-based measurement inherently captures fast transient changes without the bandwidth limitations of conventional electrical sensing methods.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If magnetoresistive structure is used for fast current detection, then the measurement precision and speed are improved, but the ease of manufacture decreases

Engineering Contradiction:

Improveaccuracy of current detectionVSAvoidfabrication complexity of magnetoresistive structure

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The patent employs magnetoresistive structures that can be fabricated using established semiconductor manufacturing processes. By leveraging existing CMOS-compatible magnetoresistive technology, the system achieves high measurement precision while maintaining reasonable manufacturability through standard industrial fabrication methods.

Inventive Principle:

Principle #35Parameter changes

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

This solution provides high temporal resolution and efficient detection of current strengths, enabling precise zero current detection and potential separation, thereby enhancing the efficiency of voltage converters.

Implementation Method 1

The magnetoresistive structure is configured to vary a resistance depending on a magnetic field caused by the current of the signal to be sensed

Methodology Applied

Scientific EffectMagnetoresistive effect: Magnetoresistance

Implementation Method 2

the variation of the resistance is based on a giant magnetoresistive effect or a tunnel magnetoresistive effect

Methodology Applied

Scientific EffectGiant magnetoresistive effect: Magnetoresistance

Implementation Method 3

the variation of the resistance is based on a giant magnetoresistive effect or a tunnel magnetoresistive effect

Methodology Applied

Scientific EffectTunnel magnetoresistive effect: Magnetoresistance

Data Source

PatentUS10823766B2Detector and a voltage converter

Publication Date: 2020.11.03 INFINEON TECH AUSTRIA AG

AI summary

A detector for detecting an occurrence of a current strength of interest (e.g. zero current) of a current of a signal to be sensed includes a magnetoresistive structure and a detection unit. The magnetoresistive structure varies a resistance depending on a magnetic field caused by the current of the signal to be sensed. Further, the detection unit generates and provides a current detection signal indicating an occurrence of the current strength of interest based on a detected magnitude of the varying resistance of the magnetoresistive structure.