Multiphase Regulator Phase Current Testing with Ramp Patterns

Solution Overview

Problem

Conventional multiphase regulators lack sophisticated fault protection mechanisms to detect subtle failures, particularly when operating under changing conditions, leading to potential thermal issues and inefficiencies at high load currents.

Innovation Solution

A multiphase regulator with a controller that performs self-testing by monitoring phase currents and using specific operation modes to detect faulty components, such as missing or defective inductors and capacitors, even if the total current delivered is within specified limits, enabling the regulator to prevent significant failures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If simple fault protection based on voltage, current, power and temperature monitoring is implemented, then the system can detect obvious failures, but it fails to detect subtle conditions where the regulator operates properly under some conditions but not others

Engineering Contradiction:

Improvefault detection capabilityVSAvoidmonitoring system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system performs preliminary testing during startup by ramping up the output voltage and monitoring the resulting inductor current patterns. This preliminary action allows detection of component failures before the regulator enters normal operation, where subtle faults might be masked by proper regulation under certain load conditions.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system changes operating parameters by ramping the output voltage from zero to a test level and observing the dynamic current response. This parameter change reveals faults that are not detectable under steady-state operating conditions, such as missing inductors or capacitors that might still allow regulation under light loads.

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If the regulator operates under no load or light load conditions, then it can properly regulate output voltage, but it fails to detect component failures that manifest at higher load currents

Engineering Contradiction:

Improveregulation performanceVSAvoidfault detection under varying loads

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The system performs preliminary testing during startup by ramping up the output voltage and monitoring the resulting inductor current patterns. This preliminary action allows detection of component failures before the regulator enters normal operation, where subtle faults might be masked by proper regulation under certain load conditions.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements periodic self-testing during startup sequences, where the output voltage is ramped up and down multiple times to observe current patterns. This periodic testing ensures that component failures are detected regardless of the subsequent load conditions the regulator will encounter.

Inventive Principle:

Principle #19Periodic action

3Loss of information

If conventional voltage and current monitoring is used, then the system can monitor operating parameters, but it cannot detect missing output phase components or connections that allow regulation under some conditions

Engineering Contradiction:

Improvemonitoring informationVSAvoidsubtle fault detection

Core Design Contradiction:

Loss of informationVSDifficulty of detecting and measuring

Solution Approach 1:

The system performs preliminary testing during startup by ramping up the output voltage and monitoring the resulting inductor current patterns. This preliminary action allows detection of component failures before the regulator enters normal operation, where subtle faults might be masked by proper regulation under certain load conditions.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system uses feedback from current sense amplifiers to monitor the actual current flowing through each phase during voltage ramping. This feedback mechanism provides detailed information about current distribution patterns, enabling detection of missing components or connections that would not be apparent from simple voltage and current magnitude monitoring alone.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS11196342B2Multiphase regulator with phase current testing using ramp current patterns

Publication Date: 2021.12.07 INFINEON TECH AUSTRIA AG

AI summary

According to an embodiment, a multiphase regulator includes a plurality of output phases each of which is operable to deliver a phase current through a separate inductor to a load connected to the output phases via the inductors and an output capacitor. A controller is operable to regulate a voltage delivered to the load by adjusting the phase currents delivered to the load by the output phases, monitor the phase currents delivered to the load by the output phases, test the output phases in a predetermined sequence, and determine if the phase currents respond in a predetermined way.