Active Noise Filter Failure Detection for Power Converters
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Solution Overview
Problem
Existing noise filters with active elements in power converter devices are prone to failure, leading to increased conduction noise that can malfunction surrounding machines, as they lack effective failure detection and prevention mechanisms.
Innovation Solution
A hybrid noise filter system that includes an active filter circuit connected to a power converter device, equipped with a controller to monitor power source variations and diagnose circuit abnormalities, allowing for the suspension of power converter operations when a failure is detected, thereby preventing noise propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If an active filter is used in the noise filter configuration, then the noise filter size can be reduced, but the reliability decreases due to easier failure of active elements
Solution Approach 1:
The controller performs preliminary monitoring of the active element's operation state and predicts potential failures before they occur. By detecting abnormal trends in advance and taking preventive actions, the system avoids actual failures and maintains reliability while keeping the active filter configuration for size reduction.
Solution Approach 2:
The controller continuously monitors the operation state of the active element and uses feedback information to adjust system operation. When abnormalities are detected, the controller switches to a safe operating mode, ensuring reliability while maintaining the compact active filter design.
2Object-generated harmful factors
If the active filter fails, then the conduction noise increases and can cause malfunction of surrounding machines, but there is no mechanism to detect and prevent this
Solution Approach 1:
The controller continuously monitors the operation state of the active element and uses feedback information to detect abnormalities. When the active element fails or shows signs of failure, the controller detects the change in operation state and switches to a safe operating mode, preventing conduction noise from increasing and causing malfunction of surrounding machines.
Solution Approach 2:
The system applies preliminary anti-action by detecting abnormal operation states before complete failure occurs and switching to a safe operating mode that prevents harmful conduction noise. This proactive approach counteracts the potential harmful effects before they can manifest.
3Productivity
If the power converter device continues to operate with a failed active filter, then productivity is maintained, but conduction noise propagates to surrounding machines causing malfunction
Solution Approach 1:
The system dynamically adjusts its operation mode based on the health status of the active element. When abnormalities are detected, the controller switches from normal operation to a safe operating mode, dynamically adapting to maintain productivity while preventing harmful conduction noise propagation.
Solution Approach 2:
The controller uses feedback from continuous monitoring of the active element's operation state to determine when to switch between normal and safe operating modes. This feedback mechanism ensures that productivity is maintained when possible, but conduction noise is prevented from propagating when failures occur.
Data Source
AI summary
Provided is an active filter circuit connected to a power-receiving terminal of a power line for an alternating-current power supplied to a power converter device from an alternating-current power grid or a direct-current power source interconnected with the alternating-current power grid, or for a direct-current power supplied from the direct-current power source for reducing a harmonic component of a conduction noise propagating to the power line and outputting the reduced harmonic; and a controller for monitoring a variation in the state of an input power entering a power source module for generating drive power for an active element constituting the active filter circuit, or a variation in the state of the drive power supplied from the power source module, and diagnosing an abnormality of a circuit operation for a circuit including the active element of the active filter circuit therein.