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LC Filter Structure and Function
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- Basic Concept
- LC filter combines inductor and capacitor to improve electronic signal quality
- Rectifiers convert AC to DC using diodes, but devices need flat DC signal
- Filters improve output quality after rectification
- Filter Stages
- Inductor acts as choke, allowing DC to pass while attenuating AC
- Capacitor blocks DC current while allowing AC to pass to ground
- Capacitive reactance peaks at low frequencies
- LC Filter Operation
- LC filter consists of inductor in series and capacitor in parallel
- Higher quality filters can have multiple stages
- Pi filter uses one more capacitor than standard LC filter
- Applications
- Used in low-pass, high-pass, band-pass, and band-stop filters
- Improves output quality of rectifiers
- Multiple stages increase filter quality but add cost