Failure prediction of electrolytic capacitors during operation of a switchmode power supply

Lahyani, Amine; Venet, Pascal; Grellet, G.; Viverge, P.-J.

doi:10.1109/63.728347

Cited by 320 publications

(140 citation statements)

References 3 publications

Supporting

Mentioning

134

Contrasting

Unclassified

Order By: Relevance

“…For CE point of view, it has a major impact in low frequency. This trend is confirmed by previous study [4]. As observed in [6], the ESR increases slowly at the beginning of lifetime, but this trend speeds up at the end of lifetime.…”

Section: A Experimental Resultssupporting

confidence: 80%

“…Several recent studies presented the long-term behavior of SMPS. As a result of the degradation of the electrolytic capacitors which are used to filter the output voltage of SMPS, an increase of ripple in the output voltage of SMPS was illustrated in [4] [5]. Another consequence is the increase of EME, as shown in [6], which is associated with the degradation of filtering passive devices.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study of the thermal aging effect on the conducted emission of a synchronous buck converter

Boyer

Sentis

Ghfiri

et al. 2017

2017 International Symposium on Electromagnetic Compatibility - EMC EUROPE

View full text Add to dashboard Cite

Abstract-This paper studies the impact of the accelerated thermal aging on the conducted emission produced by a synchronous buck converter. The most degraded devices mounted on the DC-DC converter are identified and modeled in order to simulate the evolution of conducted emission and anticipate risks of non-compliance to emission requirements.Keywords-DC-DC converter; electromagnetic emission; accelerated aging; degradation modeling I. INTRODUCTIONBecause of their high power efficiency, switch-mode power supplies (SMPS) are widely used in electronic applications [1]. However, one main drawback of SMPS is the noise produced by the switching activity, responsible for conducted and radiated electromagnetic emission (EME). Therefore, the management of the parasitic emission of SMPS is a frequent topic in the literature on electromagnetic compatibility (EMC). Numerous papers dealt with the origin and the modeling of EME, and also the development of design guidelines to improve these issues [2] [3]. Several recent studies presented the long-term behavior of SMPS. As a result of the degradation of the electrolytic capacitors which are used to filter the output voltage of SMPS, an increase of ripple in the output voltage of SMPS was illustrated in [4] [5]. Another consequence is the increase of EME, as shown in [6], which is associated with the degradation of filtering passive devices.This work is an extension of [6], where the different devices that form a synchronous buck converter (capacitor, inductor, ferrite bead, diode, power MOSFET) are stressed thermally. Their impact on the evolution of EME is studied by simulation. Besides, the study presented in [6] focuses only on the conducted emission (CE) at the output of the DC-DC converter. This work includes the measurement and the simulation of the CE at the input of the DC-DC converter. the paper is organized as follows: the first section describes the studied DC-DC converter, the tested devices and the accelerated aging method. The second section presents the experimental results of characterization of stressed devices and their modeling. In the last section, the model of stressed devices are used to simulate the effect of thermal aging on the CE produced by the DC-DC converter. The influence of aging of different filtering passive devices is compared. II. PRESENTATION OF THE CASE STUDY A. Description of the DC-DC converterThe studied synchronous buck converter is mounted on a 55x58 mm four-layer board. This type of circuit is one of the major contributor of conducted and radiated emission in electronic systems. A simplified schematic of the converter is presented in Fig. 1. It is based on the LT3800 controller from Linear Technology, configured in step-down operation to convert the 12 V voltage provided by a battery into a 5 V regulated voltage for a maximum current of 10 A. This circuit drives the gates of two power NMOSFET (Q1, Q2) mounted in D 2 PAK package. A Schottky diode (D) is mounted in parallel to Q2. The switching frequency is set to 200 KHz. An external...

show abstract

Section: A Experimental Resultssupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Study of the thermal aging effect on the conducted emission of a synchronous buck converter

Boyer

Sentis

Ghfiri

et al. 2017

2017 International Symposium on Electromagnetic Compatibility - EMC EUROPE

View full text Add to dashboard Cite

show abstract

“…This involves very high capacitance to contain voltage ripple, thus limiting the choice to electrolytic capacitors, that degrade reliability [1]. A large capacitor is needed because most of the energy stored in the DC-link capacitor does not contribute to power decoupling.…”

Section: Introductionmentioning

confidence: 99%

A low capacitance single-phase AC-DC converter with inherent power ripple decoupling

Gottardo

Lillo

Empringham

et al. 2016

IECON 2016 - 42nd Annual Conference of the IEEE Industrial Electronics Society

View full text Add to dashboard Cite

Abstract-This paper proposes a new single-phase AC-DC conversion topology with inherent power ripple decoupling, based on the combination of a PWM H-bridge inverter, an AC side LC filter and a ZVS line commutated H-bridge. A capacitor on the AC side is used as power decoupling element. By appropriate selection of the capacitor voltage, the power ripple at twice the AC frequency can be cancelled from the DC side instantaneous power, achieving negligible DC voltage ripple using a smaller total capacitance compared to traditional solutions.Recently, several solutions using the concept of Ripple-Port have been proposed that reduce the overall capacitance. However, they usually need at least a dedicated PWM half-bridge leg, adding switching loss, and a separate LC tank. Instead, the proposed topology integrates the ripple compensation in the AC/DC conversion stage, exploiting the AC filter and minimising additional loss thanks to the ZVS of the additional H-bridge.The concept of the steady state operation of the proposed converter is described analytically and validated in simulation using MATLAB Simulink and PLECS.This work is being developed at University of Nottingham within the framework of project SENSIBLE.

show abstract

“…However, LED drivers have a shorter lifetime than LED chips because the electrolytic capacitors do not last 20,000 hours [5,6]. Since most LED drivers require large capacitance, electrolytic capacitors are often used, especially for the PFC (Power Factor Correction) circuit's output.…”

Section: Introductionmentioning

confidence: 99%

Third Harmonic Injection Circuit to Eliminate Electrolytic Capacitors in Light-Emitting Diode Drivers

Yoo¹,

Jung²,

Jeon³

et al. 2012

Journal of Electrical Engineering and Technology

View full text Add to dashboard Cite

-A new third harmonic injection circuit for light-emitting diode (LED) drivers is proposed to eliminate electrolytic capacitors and thereby extend the lifetime of LED drivers. When a third harmonic current is injected to the input current of the LED driver, the required capacitance of the driver can be reduced. The proposed circuit can control an injection ratio and has simple circuitry. The synchronous third harmonic is generated by a phase locked loop (PLL), a 1/3 counter, and op-amps and applied to a power factor correction circuit. Thus, the storage capacitor can install film capacitors instead of the electrolytic capacitor. The value of storage capacitance can be reduced to 78% compared to an input power factor of 100%. The proposed circuit is applied to the 80W prototype LED driver to experimentally verify the performances.

show abstract

Failure prediction of electrolytic capacitors during operation of a switchmode power supply

Cited by 320 publications

References 3 publications

Study of the thermal aging effect on the conducted emission of a synchronous buck converter

Study of the thermal aging effect on the conducted emission of a synchronous buck converter

A low capacitance single-phase AC-DC converter with inherent power ripple decoupling

Third Harmonic Injection Circuit to Eliminate Electrolytic Capacitors in Light-Emitting Diode Drivers

Contact Info

Product

Resources

About