Multi-Phase Fault Detection Circuit Using Phase-Difference Signals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing multi-phase power supplies lack the capability to detect failures in individual drive phases, leading to improper operation when any single phase fails.
Innovation Solution
A fault detection circuit comprising phase difference detection circuits, smoothing circuits, and an error detection circuit to compare phase difference detection voltages, switching abnormality detection signals when voltages exceed a preset tolerance range, enabling high fault detection capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multi-phase power supply is used to increase power supply capability, then power consumption capacity is improved, but fault detection capability deteriorates
Solution Approach 1:
The fault detection circuit segments the multi-phase power supply monitoring into individual phase difference detection circuits. Each circuit independently monitors the phase difference between adjacent phases, allowing targeted fault detection without compromising the overall power supply capability. This segmentation enables the system to maintain high power output while achieving reliable fault detection for each phase.
2Reliability
If phase difference detection is implemented for each phase, then fault detection capability is improved, but circuit complexity increases
Solution Approach 1:
Adjacent phase difference detection circuits are merged into a single integrated circuit. This merging reduces the total number of separate circuits needed while maintaining the ability to detect phase differences across all phases. The combined circuit processes multiple phase comparisons through a unified structure, thereby reducing overall circuit complexity while preserving comprehensive fault detection capability.
3Measurement precision
If multiple phase difference detection circuits are used, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The phase difference detection circuit is designed with multi-functionality to perform multiple phase comparisons within a single circuit structure. The circuit can detect phase differences between adjacent phases sequentially or simultaneously through its versatile design, eliminating the need for separate dedicated circuits for each phase pair. This universal approach maintains high measurement precision while reducing the number of required circuits.
Data Source
AI summary
A fault detection circuit according to the present disclosure includes a plurality of phase difference detection circuits configured to generate phase difference measurement signals having a pulse width corresponding to a magnitude of a phase difference between two of drive signals of different phases among a plurality of drive signals, a plurality of smoothing circuits configured to smooth the phase difference measurement signals, which have been associated with the smoothing circuits, respectively, in advance, and output phase difference detection voltages each having a voltage value corresponding to the magnitude of the phase difference; and an error detection circuit configured to compare the plurality of phase difference detection voltages and switch abnormality detection signals from a disabled state to an enabled state when there is the phase difference detection voltage having a voltage value exceeding a preset tolerance range.