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Reliability is a crucial performance indicator of power electronic systems in terms of availability, mission accomplishment and life cycle cost. A paradigm shift in the research on reliability of power electronics is going on from simple handbook based calculations (e.g. models in MIL-HDBK-217F handbook) to the physics-of-failure approach and design for reliability process. A systematic design procedure...
While resonant converters have been gaining much attention within the recent years, their exact mathematical description is rather complicated. Thus, simplified calculation methods are very attractive, e.g. the First Harmonic Approximation (FHA). Although the steady state solution of these simplified methods is usually quite acceptable and close to the exact solution, the prediction of the ZVS characteristic...
This paper presents a frequency domain input impedance model for three phase diode rectifier. Compared to literature work, this model has two significantly better features: (1) it is valid in a wide frequency range, which is from below fundamental frequency to more than 30 times of fundamental frequency; (2) it considers the effect of the ac line impedance and output dc impedance, by setting them...
Reducing power loss in wireless power receivers is important to avoid thermal design issues. Synchronous rectification is a suitable means for loss reduction. In this paper we propose a synchronous rectifier with a simple control scheme. A detailed analysis leads to a time-domain model which is used to perform a power loss analysis. Experimental verification shows that the predicted efficiency improvement...
Front-end AC/DC single-phase converters in typical two-stage AC/DC converters are typically implemented with linear controllers that allow them to perform input power factor correction (PFC). Such conventional PFC controllers generally have a very low bandwidth voltage loop to filter the 2nd harmonic DC bus ripple, but this loop results in from poor dynamic performance. In this paper, a comparative...
A novel integrated Buck-Flyback non-isolated PFC converter is proposed in this paper. This new converter is an inherent integration of a Buck converter and a Flyback converter, which operates in either Flyback mode or Buck mode according to whether the input voltage is lower or higher than the output voltage. In this way, the dead zones of AC input current in traditional Buck PFC converter are eliminated...
This paper presents a power electronic topology for providing a vibration monitor with in-situ magnetic energy harvesting. The energy harvesting circuit uses low voltage MOSFETs and a nano-crystalline magnetic core to extract energy from an operating electrical load like a motor. This topology can be used to power sensors and wireless circuitry for diagnostics with no need for battery or special power...
An energy recycling electronic load system with multiple input channels for DC power supply burn-in test is proposed. It has high efficiency and good performance. The theoretical analysis and the control strategy are presented in this paper. The proposed system employs Input-Parallel and Output-Series Interleaved ZVS Flyback-Forward (IPOS-IZFF) converters with active-clamp circuits as the front-end...
This paper presents a new version of the Dual In-line Package Intelligent Power Module (DIPIPM™ Ver.5) developed by Mitsubishi Electric for motor control in consumer goods. The DIPIPM™ Ver.5 features a complete IGBT (Insulated Gate Bipolar Transistor) protection strategy. The bootstrap diode and current limiting resistor are now built-in so that the only external component required for the high side...
Regenerative motor-drive systems are utilized in several industrial applications that require frequent power generation back to the grid. In these applications, the standard front-end diode bridge commonly used in non-regenerative drives is replaced by an Active Front End “AFE” power converter. The main advantages of the AFE are that it can regenerate power back to the grid, and provide unity power...
Waveform control method can mitigate such a low-frequency ripple current being drawn from the DC distribution while the DC distribution system delivers AC power to the load through a differential inverter. Assessment on the waveform control method and comparative study between with and without waveform control method are proposed in this paper1. Experimental results are provided to explain the operation...
This paper deals with a type of voltage swell/sag compensator based on single-phase Z-source AC-AC converter. The presented topology employs a pulse width modulation (PWM) Z-source AC-AC converter along with a transformer. During a voltage sag/swell occupation, the proposed system adjusts the adding or missing voltage and maintains the rate voltage at the terminal of the critical load. During normal...
Commercial home appliances using remotely controlled system consume the electric power while in standby mode to prepare for receiving a turn-on remote signal. The proposed power system can significantly reduce the standby power consumption without increasing the cost. Furthermore, since a Electronic Double Layer Capacitor (EDLC) is used as an auxiliary power storage element, the life cycle is longer...
Spectrally efficient wireless communication standards impose stringent linearity specifications, which would require traditional IQ transmitters to operate with back-offed and power inefficient linear RF power amplifiers (PAs). In order to overcome such a significant limitation, alternative architectures have been proposed, as those based on the Envelope Elimination and Restoration (EER) technique...
Fundamental features of the arc stability in DC arc furnace of 720V/100kA/72MW have been investigated. Cassie-Mayr arc model has been employed and applied for the target dc arc furnace. In order to characterize the parameters of Cassie-Mayr arc model and the behavior of unstable arc dynamics, the advanced arc simulations of magneto-hydrodynamics (MHD) has been performed. From the results of MHD simulation,...
A new approach to photovoltaic (PV) arrays is proposed based on a parallel connection scheme. In a series-connected array, differing insolation due to shading or obstructions causes disproportionate reduction in power output. Because operating voltage is governed more by temperature than by insolation, a parallel-connected array is much more robust to the shading effect. Direct paralleling is inappropriate...
An open-loop interleaving synchronization control method for a two-phase interleaved micro-inverter operating at the boundary conduction mode (BCM) is proposed in this paper. It shows that the only method that results in stable interleaving operation is the synchronization of the slave converter to the turn-off instant of the master converter, where each converter operates with peak current mode....
In order to raise the stability and output currents performance of PV micro-inverter, a current dual-loop control was proposed for RPI with LCL filter. A new peak currents control strategy is proposed as current inner-loop control by selecting suitable control envelope curve in the paper. This peak currents control strategy can simplify the design of the three phases LCL filter and improve the close...
This paper proposes a DC-link voltage control method for the permanent magnet synchronous generator (PMSG) wind power system with a full-rated back-to-back converter, to improve the dc-link voltage dynamic response under normal operation and grid faults conditions. The dc-link voltage is controlled by the motor-side converter, while the grid-side converter is responsible for the maximum power point...
A typical DC microgrid is investigated in this paper. Two unidirectional DC/DC converters for photovoltaic (PV), and two bidirectional DC/DC converters for batteries are included in the proposed DC microgrid system embodying multiple renewable energy sources and energy storage devices. In order to manage the system operation, a fully autonomous power management strategy, namely adaptive DC bus voltage...
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