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This paper reports on a large-size CPU package for UNIX servers which employs embedded thin film capacitor layers. The substrate of this package has two thin film capacitor layers in the surface of the core layer, which has a capacitance of 25 uF in total. In order to adopt this package substrate, we confirmed the effect of the thin film capacitor layers on the package assembly process. We actually...
LLC resonant converter is most frequently effective DC/DC converter to improve the power density and efficiency of DC charging module in electric vehicle power supply. Soft-switching technique can be applied in the topology to reduce the switch losses. However, DC charging module brings about 27% of failures in Electric vehicles (EV) charge device. The aim of this paper is to evaluate the reliability...
The modular multi-level converter is an upcoming topology for drive application in the megawatt power range. This paper presents a comprehensive reliability survey for this kind of converter which can be used for its optimal designing. In this survey, converter total failure rate, is calculated for different number of output levels to find the optimal condition in which converter can provide the best...
Reliability of power electronics is a critical issue, as most of the electrical energy is processed by power electronics. Various stressors impact the safe operation of the systems, including harsh environments, temperature variations, humidity, vibration and radiation. Physics of failure analysis uses models that describe how failure mechanisms evolve over time and induce failures. Active methods...
This paper proposes a concept of two-terminal active capacitor implemented by power semiconductor switches and passive elements. The active capacitor has the same level of convenience as a passive one with two power terminals only. A control strategy that does not require any external feedback signal is proposed and a self-power scheme for gate drivers and the controller is applied to achieve the...
For Smart Transformers (ST), reliability is one of the major problems when compared to the traditional low-frequency transformers. Modular ST with advanced control algorithms could increase the reliability compared to the non-modular solutions. This could be achieved by distributing differently the power among the cells depending on their aging. This unequal power transfer is a challenge for Cascaded...
DC-link capacitor is one of the reliability-critical components in motor drive applications, which contributes to a considerable cost, size and failure. Its reliability performance depends on both inherent physical strength and external loading. The grid unbalances could alter the electro-thermal stresses of key components in a motor drive. Therefore, this paper investigates the impact of grid voltage...
Differential power processing (DPP) module integrated converters are developed to mitigate the effects of the mismatch losses in series connected photovoltaic (PV) strings. This paper focuses on the configurations used in various DPP converter topologies by categorizing them into two main classifications: 1) Maximum power point tracking configurations and 2) voltage balancing configurations. The implementation...
High-voltage and high-current power converters are essential in numerous applications, including shipboard power systems and industrial motor drives. Most of the existing topologies are based on dc-link converters, and use dc-dc or dc-ac power cells to realize a multilevel power converter. Therefore, they require a large number of capacitors with high capacitances. This paper proposes a new modular...
In this paper, a new class of bidirectional universal power converters is presented. As a universal power converter, the proposed converter can interface any type of source and load without any limitation in their forms (ac or dc) and number of phases. In this converter, which accomplishes power conversion in a single stage, a small inductor placed in series with the input and output switch-bridges...
A reliable modular dc-dc converter that is well-suited to the MVDC grid applications is proposed in this paper. This converter benefits from zero current turn-off and soft turn-on switching; hence, it can use naturally commutated switches such as silicon-controlled rectifiers (SCR). SCRs offer numerous advantages over other types of switches, among them are simple control, long lifetime, low losses,...
This paper introduces a 97% efficiency medium voltage (MV) Solid State Transformer (SST) based on two-level single stage (TLSS) topology and 15 kV SiC MOSFETs. Series resonant converter (SRC) is implemented as the main stage and is identified as a current source (CS) SRC for the first time. Equivalent resonant frequency of the proposed CS-SRC is analyzed in both time domain and frequency domain. Resonant...
As power level grows, the power converter of wind turbines tends to use parallel-connected smaller converters. The main reason for parallel is that modular design of those smaller converters is relatively mature and cost-effective. However, the parallel of GSCs (Grid-Side Converters) is notorious for its difficulty in control. Bulky and costly filtering capacitor bank is common and LCL resonance problem...
Electrolytic Capacitor (E-cap) is one of the lifetime bottlenecks in power electronic converters. In the last two decades, various active power decoupling circuits have been proposed to improve the reliability of the DC link by eliminating the DC-link E-caps. However, additional active devices could change the stresses of the existing converters, whether the system reliability is improving or not...
With reliability and flexibility criteria surging, multi-level converters become of growing interest for high-power medium-voltage renewable energy applications. Specific objectives are met with specialized intelligent controls. The goal of this paper is to present a universal intelligent controller able to manage all degrees of freedom of multi-level power converters and any paradigm. To do so, a...
In this paper, we present an 880 MHz common-drain power amplifier (CDPA) in 130 nm CMOS technology. New PA topologies are required to address the issues of linearity, reliability, and efficiency. The CDPA is one such promising topology. Owing to the inherent feedback nature of a CDPA, the output voltage is a replica of input voltage, thus making the CDPA a highly linear amplifier with good efficiency...
In this paper, we present an 880 MHz common-drain power amplifier (CDPA) in 130 nm CMOS technology. New PA topologies are required to address the issues of linearity, reliability, and efficiency. The CDPA is one such promising topology. Owing to the inherent feedback nature of a CDPA, the output voltage is a replica of input voltage, thus making the CDPA a highly linear amplifier with good efficiency...
Recently it was demonstrated that an asymmetric DRAM capacitor stack can introduce non-volatility and at the same time outperform ferroelectric HfO2 based FeRAM in terms of cycle endurance. With the present work, we provide an in-depth study of the underlying mechanisms and perform a comprehensive retention study that characterizes ferroelectric memories. Piezoelectric force microscopy is applied...
This paper proposes a reliability-oriented component sizing procedure for the cost benchmarking of capacitive DC-links. The sizing of devices for different solutions is based on consistent specifications and design margins (e.g., designed lifetime, maximum junction temperature, and maximum total harmonic distortion). A scalability analysis is also presented to identify the most cost-effective solution...
This paper presents the state-of-the-art of integrated switched capacitor DC-DC converters in memory technology from NMOS to SOI DRAM and from 2D to 3D NAND focusing on capacitor structures with high capacitance density and small parasitic capacitance based on memory technology. The paper then proposes design for manufacturing to increase yield with redundant arrays of converter and design for reliability...
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