Filter Capacitor Bank

Product Specifications

Technical details and manufacturing context for Filter Capacitor Bank

Definition

A Filter Capacitor Bank is a critical component within the Rectifier/Output Stage of power supply systems. It consists of multiple capacitors connected in parallel or series-parallel configurations to achieve the required capacitance and voltage ratings. Its primary function is to store electrical charge and release it during the rectifier's off-cycles, thereby smoothing the pulsating DC output from the rectifier into a more stable, continuous DC voltage. This significantly reduces voltage ripple, suppresses high-frequency noise, and improves the overall quality and stability of the DC power supplied to downstream electronic circuits or loads. The capacitor bank charges during the peaks of the rectified AC waveform and discharges during the troughs, filling in the gaps to maintain a near-constant voltage level. The large combined capacitance provides a low-impedance path for AC ripple components to ground, effectively filtering them out from the DC output. Typical parameters include a total bank capacitance of 100–1000 µF, rated voltage of 400–690 V AC, capacitance tolerance of ±5%, dissipation factor ≤0.002 at 20°C and 50/60 Hz, operating temperature range -25–55°C, maximum overvoltage of 1.1×Un for 8 hours per day, maximum overcurrent of 1.3×In continuous including harmonics, dielectric strength of 2.15 kV AC between terminals and case for 10 seconds, insulation resistance ≥100 MΩ at 500 V DC, enclosure protection IP20–IP54, typical dimensions 600×400×800 mm for a 100 kvar bank, and weight 50–150 kg. These values are reference ranges and must be verified with the manufacturer for specific models. The bank may use aluminum electrolytic, film, or ceramic capacitors. Standards such as IEC 60831-1 and IEC 60529 are referenced for verification. Always confirm model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The capacitor bank charges during the peaks of the rectified AC waveform and discharges during the troughs, filling in the gaps to maintain a near-constant voltage level. The large combined capacitance provides a low-impedance path for AC ripple components to ground, effectively filtering them out from the DC output.

Common Materials

Aluminum Electrolytic Capacitor, Film Capacitor, Ceramic Capacitor

Technical Parameters

Parameter	Typical range	Notes & selection driver
Capacitance	100–1000 µF	Total bank capacitance for ripple filteringIEC 60831-1
Rated Voltage	400–690 V AC	Maximum continuous operating voltageIEC 60831-1
Capacitance Tolerance	±5 %	Deviation from nominal capacitanceIEC 60831-1
Dissipation Factor	≤0.002	At 20°C, 50/60 HzIEC 60831-1
Operating Temperature	-25–55 °C	Ambient temperature rangeIEC 60831-1
Maximum Overvoltage	1.1 ×Un	For 8 hours per dayIEC 60831-1
Maximum Overcurrent	1.3 ×In	Continuous, including harmonicsIEC 60831-1
Dielectric Strength	2.15 kV AC	Between terminals and case, 10 sIEC 60831-1
Insulation Resistance	≥100 MΩ	Between terminals and case at 500 V DCIEC 60831-1
Enclosure Protection	IP20–IP54	Depending on installation environmentIEC 60529
Dimensions (L×W×H)	600×400×800 mm	Typical for 100 kvar bank
Weight	50–150 kg	Depends on capacitance and enclosure

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Capacitor Element Part
Basic energy storage unit; stores and releases electrical charge.

Material: Aluminum, dielectric electrolyte, plastic casing
Busbar / Connecting Terminals Part
Interconnects multiple capacitors in parallel/series and provides connection points to the circuit.

Material: Copper or aluminum
Mounting Frame / Chassis Part
Provides mechanical support, organization, and sometimes heat dissipation for the capacitor array.

Material: Steel or aluminum
Bleeder Resistor (optional) Optional Part
Safely discharges stored charge when power is removed.

Material: Ceramic, metal film

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Rectifier / Output Stage

View system integration details

Rectifier/Charger

View system integration details

Manufacturers of Filter Capacitor Bank

Manufacturer profiles associated with Filter Capacitor Bank.

Sourcing Filter Capacitor Bank from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Frequently Asked Questions

What is the primary function of a filter capacitor bank?

It smooths the pulsating DC output from a rectifier by storing charge during peaks and releasing it during troughs, reducing voltage ripple and suppressing high-frequency noise.

What are typical capacitance and voltage ratings?

Typical total bank capacitance ranges from 100 to 1000 µF, and rated voltage from 400 to 690 V AC, but these must be confirmed for the specific model.

Which standards are referenced for verification?

IEC 60831-1 for capacitor parameters and IEC 60529 for enclosure protection. These are references, not proof of compliance.

What maintenance signals indicate a problem?

Increased ripple voltage, overheating, bulging or leakage from capacitors, or failure of downstream equipment may indicate degraded performance. Regular inspection and testing are recommended.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

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.

Buyer enquiry

Request manufacturing insight for Filter Capacitor Bank

Ask for use case, specification boundaries, supplier type, and RFQ preparation information for this product.

Where it goes: Straight to the CNFX editorial desk, and to the manufacturer if this product is linked to a claimed profile. Nothing is broadcast to a supplier list.
Your details stay here: We do not sell or rent enquiry data, and we do not add you to a mailing list. Used only to answer this request.
No commission, no middleman: CNFX is a directory. We take no cut of any order and never negotiate on a supplier's behalf.
What we don't claim: A listing is not an endorsement. Qualify every supplier and verify every figure yourself before ordering.

pressure:	Atmospheric to 1.5 bar (sealed units), N/A for open configurations
other spec:	Ripple current rating: 10-100A RMS, Voltage ripple reduction: 70-95%, ESR: 5-50mΩ
temperature:	-40°C to +85°C (operating), -55°C to +105°C (storage)

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards