Use of ESR for deterioration diagnosis of electrolytic capacitor

Method for DC-link capacitance identification in voltage-source converters

“…In the case of aluminium electrolytic capacitors, also increased equivalent series resistance (ESR) has been used as an end-of-life indicator [2]. However, the capacitance-monitoring method is more universal, since it is applicable in the case or metallized polypropylene film capacitors and multi-layer ceramic capacitors as well [3]- [6].…”

“…However, among the semiconductor devices the capacitors are the most fragile components in the converters [1]. A typical reason for the capacitor failure is the long-term wear out, which can be seen as a change of electrical parameters of the capacitor [2], [3]. Monitoring electrical parameters of the capacitor provides information of the capacitor condition.…”

Design & Analysis of Grid Feeding PV System with Using Improved H6 Topology

“…Therefore, timely replacement of electrolytic capacitor isdesired. Various techniques are discussed in the literature for online health monitoring of electrolytic capacitors used in dc-dc converters [10]- [13] and inverters [14]- [22]. In [14], the ratio of average power loss in electrolytic capacitor to the square of root mean square (RMS) of current flowing through capacitors evaluated to determine ESR.…”

Identification of DC-Link Capacitance for Single-Phase AC/DC PWM Converters

“…However, this method is too complex and requires a few hours of measurement due to chemical processing. Since the ESR of an electrolytic capacitor is increased with aging, its deterioration can be determined by measuring the change in ESR [6]- [10]. For a buck-boost and forward DC/DC converters, an analytic relationship between the capacitor current and voltage was used to estimate the ESR value, and this approach has been successfully applied to these kinds of converters [6].…”

“…Since the ESR of an electrolytic capacitor is increased with aging, its deterioration can be determined by measuring the change in ESR [6]- [10]. For a buck-boost and forward DC/DC converters, an analytic relationship between the capacitor current and voltage was used to estimate the ESR value, and this approach has been successfully applied to these kinds of converters [6]. Also, another method was proposed, which determines if the ESR has increased more than five times its initial value in the electrolytic capacitors used for LC filters of switching mode power converters [7].…”