Compact Parallel Filter for Harmonic Cancellation and Surge Protection
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Solution Overview
Problem
Existing filter circuits fail to efficiently attenuate false electrical currents, unbalanced electrical loads, and harmful harmonics, leading to increased total harmonic distortion (THD) and inadequate protection against voltage surges, while being costly and inefficient.
Innovation Solution
A compact multifunctional filter combining a parallel active filter and passive filter with varistors, utilizing a digital signal processor and insulated gate bipolar transistors to cancel harmonics and provide surge protection, reducing THD and stabilizing power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If separate passive and active filters are used, then harmonic attenuation is achieved, but surge protection is inadequate
Solution Approach 1:
The patent integrates surge protection functionality into the filter system by connecting varistors in parallel with the filter circuit. The varistors detect voltage surges and provide protective clamping action, while the passive and active filter components continue to handle harmonic attenuation, creating a multi-functional system that addresses both harmonic distortion and voltage surge protection
2Object-generated harmful factors
If complex filter designs are implemented, then harmonic attenuation performance is improved, but manufacturing and maintenance costs increase
Solution Approach 1:
The filter system is divided into distinct functional modules: a passive filter section with RLC circuits for harmonic attenuation, an active filter section with power electronic converters for dynamic compensation, and varistor components for surge protection. This modular segmentation allows each component to be optimized independently and facilitates easier manufacturing, assembly, and maintenance compared to integrated complex designs
Data Source
AI summary
An electronic filter with passive and active filters installed in parallel on an electrical network. The passive filter attenuates an unwanted harmonic on the network. The active filter detects remaining unwanted harmonic and generates a sinusoidal signal introduced to the network to cancel remaining harmonic.