Power Conversion Device Overcurrent Detection Delay Reduction
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Solution Overview
Problem
Current abnormality detection in power conversion devices is delayed due to noise filtering, which hampers timely detection of current abnormalities.
Innovation Solution
A control device for power conversion devices that includes a current detection unit outputting a state detection value larger than the error signal and an abnormality detection unit that detects abnormalities without filtering, allowing for immediate detection of current abnormalities by comparing detection values from multiple current sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If filter processing is applied to the error signal to suppress noise-induced malfunction, then reliability is improved, but detection speed deteriorates causing delay in current abnormality detection
Solution Approach 1:
The patent segments the detection system into two independent pathways: a filtered error signal pathway for reliable abnormality determination and a state detection value pathway for immediate response. The state detection value is generated separately without filtering, allowing instantaneous detection while the filtered error signal provides reliable confirmation for abnormality declaration.
Solution Approach 2:
The patent introduces a state detection value as an intermediary parameter that bridges the gap between raw current detection and filtered error signals. This intermediate value provides immediate feedback about current state without the delay introduced by filtering operations, enabling rapid response while maintaining reliable abnormality detection through the separate filtered pathway.
2Measurement precision
If filter processing is applied to suppress noise, then false detection is reduced, but response time to actual abnormalities increases
Solution Approach 1:
The detection system is divided into two parallel channels: one channel processes the error signal through filtering to achieve precise abnormality detection, while the other channel generates the state detection value instantly without filtering to provide immediate detection speed. Both channels operate independently and complement each other.
Solution Approach 2:
The patent applies partial filtering - the error signal undergoes filter processing for precision, while the state detection value bypasses filtering entirely for speed. This partial application of filtering to only the necessary component achieves the desired precision without sacrificing overall detection speed.
Data Source
AI summary
A control device for a power conversion device that is capable of detecting current abnormality of the power conversion device with no delay is provided. The control device for the power conversion device includes a current detection unit for outputting an error signal when a detection value of a current sensor for detecting current flowing through the power conversion device is larger than a preset overcurrent determination value, and outputting a state detection value larger than a value corresponding to the error signal based on the error signal, and an abnormality detection unit for accepting an input of the state detection value of the current detection unit via the wiring, and an abnormality detection unit for outputting an error signal when the state detection value of the current detection unit is larger than a preset overcurrent abnormality determination value, and detecting abnormality based on the error signal.