INDUSTRY COMPONENT

Filter Capacitor

Filter capacitor for smoothing rectified AC to DC in LED drivers

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Component Specifications

Definition
A filter capacitor is an electronic component used in power supply circuits to reduce ripple voltage by storing and releasing electrical charge, ensuring stable DC output in high-efficiency LED driver modules. It smooths the pulsating DC from rectifiers, minimizing electromagnetic interference (EMI) and protecting sensitive LED components from voltage fluctuations.
Working Principle
Operates by charging during voltage peaks and discharging during troughs, acting as a low-pass filter that attenuates high-frequency AC components while allowing DC to pass through. In LED drivers, it maintains consistent voltage levels across the load, preventing flicker and ensuring optimal LED performance and longevity.
Materials
Typically constructed with aluminum electrolytic or ceramic dielectric materials; aluminum electrolytic capacitors offer high capacitance values (e.g., 100-1000µF) for bulk filtering, while ceramic capacitors provide low ESR for high-frequency noise suppression. Electrolyte: non-solid or solid polymer; electrodes: aluminum foil; casing: aluminum can with insulating sleeve.
Technical Parameters
  • ESR Low ESR (<0.1Ω)
  • Lifetime 2000 to 10000 hours at rated temperature
  • Tolerance ±20%
  • Capacitance 100µF to 1000µF
  • Voltage Rating 16V to 450V DC
  • Temperature Range -40°C to +105°C
Standards
ISO 9001, IEC 60384, AEC-Q200

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Filter Capacitor.

filter capacitor LED driver capacitor electrolytic capacitor power supply capacitor EMI filter DC smoothing capacitor Filter Capacitor in Electrical Equipment Manufacturing

Parent Products

This component is used in the following industrial products

High-Efficiency LED Driver Module

Electronic power supply component converting AC to DC for LED lighting systems.

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Power Supply Unit

A device that converts and regulates electrical power from an external source to provide stable, appropriate voltage and current to other components within an industrial system.

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Power Supply Unit

A device that converts and regulates electrical power from an external source to provide stable, appropriate voltage and current to other components within an industrial system.

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Engineering Analysis

Risks & Mitigation
  • Overheating from high ripple current
  • Electrolyte leakage causing circuit damage
  • Reduced lifespan in high-temperature environments
FMEA Triads
Trigger: High operating temperature exceeding rated limits
Failure: Capacitance degradation or open circuit
Mitigation: Use capacitors with higher temperature ratings (e.g., 105°C), improve thermal management with heatsinks or ventilation
Trigger: Voltage spikes from power surges
Failure: Dielectric breakdown leading to short circuit
Mitigation: Implement overvoltage protection circuits, select capacitors with higher voltage ratings (e.g., 1.5x operating voltage)

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Capacitance tolerance within ±20% as per IEC 60384 standards
Test Method
Testing includes capacitance measurement (LCR meter), ESR analysis, leakage current test, and temperature cycling per AEC-Q200 for automotive-grade applications

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

Why are filter capacitors important in LED driver modules?

They smooth rectified AC to stable DC, preventing LED flicker, reducing heat generation, and extending LED lifespan by minimizing voltage fluctuations.

What are common failure modes of filter capacitors in LED drivers?

Electrolyte drying, increased ESR, capacitance loss, or short circuits due to overvoltage, high temperature, or poor quality, leading to driver malfunction or LED damage.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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