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The rated pulse load for a certain capacitor is limited by the rated voltage, the pulse repetition frequency, temperature range and pulse rise time. The "pulse rise time" /, represents the steepest voltage gradient of the pulse (rise or fall time) and is expressed in volts per μs (V/μs).
aluminium electrolytic capacitors with non-solid electrolytes normally can be charged up to the rated voltage without any current surge, peak or pulse limitation. This property is a result of the limited ion movability in the liquid electrolyte, which slows down the voltage ramp across the dielectric, and of the capacitor's ESR.
The rated pulse voltage V p is the peak value of the pulse voltage which may be applied continuously to a capacitor at the rated temperature and at a given frequency. The pulse voltage capacity is given as pulse voltage rise time dV/dT in V/μs and also implies the maximum pulse current capacity.
Aluminum electrolytic capacitors, the most common type of electrolytic, suffer a shortening of life expectancy at higher ripple currents. If ripple current exceeds the rated value of the capacitor, it tends to result in explosive failure.
Referring to IEC/EN 60384-1 standard the allowed operating voltage for tantalum capacitors is called "rated voltage U R" or "nominal voltage U N". The rated voltage U R is the maximum DC voltage or peak pulse voltage that may be applied continuously at any temperature within the rated temperature range T R (IEC/EN 60384-1).
The rated voltage is the maximum DC voltage or peak pulse voltage that may be applied continuously at any temperature within the rated temperature range. The voltage proof of electrolytic capacitors, which is directly proportional to the dielectric layer thickness, [ 6 ] decreases with increasing temperature.
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