Active Filter Signal Isolation for Current Distortion Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing current distortion reduction systems face issues due to variations in reference potentials among active filters, leading to current flow and noise interference, which adversely affect the operation of multiple active filters.
Innovation Solution
A current distortion reduction apparatus that includes a reference potential variation influence reduction unit to electrically insulate or transmit signals related to load current distortion using radio communication or optical conversion, ensuring that active filters acquire signals without reference potential variations, thereby reducing operational interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple active filters share detection results through a signal line, then the system can reduce distortion of load current, but variations in reference potential cause current flow and noise interference between filters
Solution Approach 1:
The patent introduces an intermediary device (isolator or converter) between the detection unit and multiple active filters. This intermediary converts the detection signal into a form that can be shared without reference potential variations affecting the filters. Specifically, it uses an isolator to electrically isolate the signal line from reference potential variations, or a converter to transform the signal into a different domain (e.g., optical signal, differential signal) that is immune to reference potential differences.
Solution Approach 2:
The patent replaces the traditional electrical signal transmission mechanism with alternative mechanisms that are not affected by reference potential variations. This includes using optical signals instead of electrical signals, or using differential signaling instead of single-ended signaling. By substituting the signal transmission mechanism, the system eliminates the harmful effect of reference potential variations while maintaining the ability to share detection results among multiple active filters.
2Ease of operation
If reference potentials of multiple active filters are connected, then signal sharing is enabled, but current flows between filters due to reference potential variations
Solution Approach 1:
The patent introduces an intermediary device (isolator or converter) between the detection unit and multiple active filters. This intermediary converts the detection signal into a form that can be shared without reference potential variations affecting the filters. Specifically, it uses an isolator to electrically isolate the signal line from reference potential variations, or a converter to transform the signal into a different domain (e.g., optical signal, differential signal) that is immune to reference potential differences.
Solution Approach 2:
The patent segments the signal distribution system into isolated zones, where each active filter receives the detection signal through an independent isolation path. Instead of connecting all filters to a common reference potential, the system divides the signal distribution into separate channels with individual isolators or converters for each filter. This segmentation prevents current flow between filters while maintaining signal sharing capability.
3Productivity
If detection results are shared through signal lines, then multiple filters can operate cooperatively, but noise from reference potential variations degrades operation
Solution Approach 1:
The patent introduces an intermediary device (isolator or converter) between the detection unit and multiple active filters. This intermediary converts the detection signal into a form that can be shared without reference potential variations affecting the filters. Specifically, it uses an isolator to electrically isolate the signal line from reference potential variations, or a converter to transform the signal into a different domain (e.g., optical signal, differential signal) that is immune to reference potential differences.
Solution Approach 2:
The patent replaces the traditional electrical signal transmission mechanism with alternative mechanisms that are not affected by reference potential variations. This includes using optical signals instead of electrical signals, or using differential signaling instead of single-ended signaling. By substituting the signal transmission mechanism, the system eliminates the harmful effect of reference potential variations while maintaining the ability to share detection results among multiple active filters.
Data Source
AI summary
A technology that can reduce the influence of variations in the reference potential of each current output device on the operation of multiple current output devices, when using the multiple current output devices to reduce the distortion of the load current, is provided. A plurality of active filters 41 to 43 are configured to reduce distortion of a load current supplied from the AC power supply 10 to the load device 20, based on a detection signal output from the load current sensor 30, the detection signal relating to the distortion of the load current; and the signal transmitting unit 44 configured to cause the plurality of active filters 41 to 43 to acquire a signal relating to the distortion of the load current, to reduce influence due to variation of a standard potential of the plurality of active filters 41 to 43, based on the detection signal output from the load current sensor 30.