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Derating Snubber Capacitors for IGBT Inverters: Ripple-Current Stress and Expected Life
Metallized polypropylene snubber capacitors absorb the energy stored in the stray inductance of an IGBT half-bridge at e...
akknNews Replacing Obsolete DC-Link Capacitors in VFD Repairs: A Parameter-by-Parameter Guide
Why Original Parts Disappear from the Supply Chain Variable frequency drives (VFDs) from the mid-2000s often use DC-link...
akknNews A Motor Drive Fails at Start-Up: Tracing Obsolete European Capacitor Failures
A maintenance engineer reports a twenty-year-old servo drive that trips on undervoltage every time the line starts. The ...
akknNews Verifying Capacitor Authenticity at Incoming Inspection: Key Parameters, Test Gates, and Cost Tradeoffs
Counterfeit and re-marked capacitors usually enter the supply chain through grey-market brokers, excess-stock resellers,...
akknNews Verifying Capacitor Authenticity at Incoming Inspection: Key Parameters, Test Gates, and Cost Tradeoffs
Counterfeit and re-marked capacitors usually enter the supply chain through grey-market brokers, excess-stock resellers,...
akknNews Counterfeit Capacitor Claims: Building a Cost-Based Incoming Inspection Checklist
The Real Cost Drivers in Capacitor Sourcing When a capacitor lot fails in the field, the replacement component cost is r...
akknNews Pinpointing Capacitor Weak Points: Estimating Ripple-Current Stress in Switching Supplies
Consider a synchronous buck converter operating from a 12 V bus, delivering 3.3 V at 5 A with a switching frequency of 2...
akknNews DC Bias Effects on MLCC Reliability: Estimating Effective Capacitance and Service Life
Class 2 multilayer ceramic capacitors (MLCCs) — X5R, X7R, X7T — provide high volumetric capacitance at a low unit cost, ...
akknNews Sourcing Film Capacitor Replacements: Matching Self-Healing Behavior and dV/dt Limits
When the Original Part Drops Out of the Supply Chain Film capacitors used in snubber, resonant, and clamping circuits ar...
akknNews When the Inverter Trips on Overvoltage: Tracing DC-Link Capacitor ESR Drift and Ripple Stress
Field Symptom: Random Overvoltage Faults at Full Load A 45 kW inverter in a conveyor drive began tripping on DC-bus over...
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