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Selected Category：Aluminum Electrolytic Capacitors > Lifetime and Reliability
Aluminum electrolytic capacitors are components that are subject to wear. Product failure is judged based on service life , which is calculated using judgment criteria for electrical properties.
When measuring the ambient temperature of aluminum electrolytic capacitors, it is necessary to ascertain heat convection, heat radiation, heat conduction as accurately as possible.
Here, we introduce measurement methods using a dummy capacitor.
The lifetime of aluminum electrolytic capacitors is largely dependent on the application conditions. Environmental factors include temperature, humidity, atmospheric pressure and vibrations. Electrical factors include operating voltage, ripple current and chargedischarge.
For designing the device with aluminum electrolytic capacitors, a failure rate and useful life are necessary to be considered for their reliability.
When using an aluminum electrolytic capacitor in something such as a power factor correction (PFC) circuit, there is a mix of overlapping ripple currents consisting of low frequencies near the electrical utility frequency and high frequencies near the switching frequency. We can use the FFT analysis function of the oscilloscope to conveniently calculate the effective value of this ripple current.
This document explains how to use the lifetime estimation for aluminum electrolytic capacitors.
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