2291 items
The Lifetime Model Behind Drive Failures When a variable frequency drive (VFD) returns from the field with a bulged or leaking DC-link capacitor, the failure is…
Why legacy European capacitor series leave the market European capacitor manufacturing has consolidated heavily over the past two decades. Well-known series from Siemens, Philips, RIFA, BHC,…
A mid-sized industrial drive returned from the field with a visibly bulged snap-in capacitor after roughly eighteen months of service. The drive sat inside a sealed…
Capacitors in switching regulators do not merely hold charge; they absorb repeated pulsed currents that generate heat inside the dielectric and the electrode structure. When a…
For design engineers and sourcing specialists comparing MLCC offers, the capacitance value printed on a datasheet is a starting point, not the usable figure. In Class…
Motor drives and grid-tied inverters built around IGBT modules place two different kinds of stress on film capacitors. One is a high-rate voltage transient at each…
Every inverter engineer faces the same two numbers: a capacitor datasheet listing 2000 h endurance at 105 °C, and a product warranty promising five years of…
When a distributor receives a request for an aluminum electrolytic capacitor that the original factory no longer produces, the quoting engineer must decide quickly whether a…
A 400 V rated bulk capacitor in a 230 V single-phase power supply returns from the field twice in one season: bulged vent, capacitance down 30%, and ESR…
Application boundary: When thermal design decides bank reliability Capacitor banks in DC links, power factor correction, and UPS output stages share one characteristic: they operate under…
When a procurement engineer at a PV inverter manufacturer compares two quotes for a 450 VDC DC-link bank, the lower-priced option is not necessarily the lower-cost…
An aluminum electrolytic capacitor that fails in service rarely announces the true cause at first inspection. A bulged can, a damp residue at the seal, or…
Replacing a wet aluminum electrolytic capacitor with a solid polymer type is often treated as a direct upgrade: lower ESR, higher ripple current, longer life. The…
Power factor correction (PFC) capacitor banks in industrial networks are built from individual metallized polypropylene film capacitor units. When one unit fails, replacing the entire bank…
A three-phase inverter drive returns from the field with a visibly cracked snubber capacitor across one IGBT module. The DC-link electrolytics test within tolerance, the gate…
Aluminum electrolytic capacitors wear out. Their lifetime is not a fixed datasheet number; it is a function of applied voltage, ripple current, and temperature at the…
Voltage derating is sometimes treated as a free, conservative habit. In practice it has a price: a 400 V rated electrolytic capacitor costs more than a…
A re-marked capacitor is not a benign substitution. The marking may match a 450 V, 100 µF, 105 °C part, but the internal foils, electrolyte, and pressure vent usually…
In an aluminum electrolytic capacitor, wear-out is governed by electrolyte evaporation through the vent and seals. The evaporation rate follows an Arrhenius-type relationship, so the internal…
When an output capacitor series is discontinued or its lead time stretches beyond the production schedule, the replacement decision for a switching power supply is never…
A quality engineer pulls five samples from a received reel of 10 µF, 0805, X7R MLCCs and measures them with the incoming-inspection LCR meter. All five…
A film capacitor that passes capacitance, ESR, and insulation checks can still fail early in service if the circuit imposes a voltage edge the electrode structure…
In an inverter, the DC-link capacitor bank sits between the rectifier or input converter and the switching stage. It holds the bus voltage stable and absorbs…
When a capacitor bank in a power converter fails, the standard reaction is to match capacitance, rated voltage, and case size from the original bill of…
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