نتایج جستجو برای: voltage stress
تعداد نتایج: 543481 فیلتر نتایج به سال:
In this paper, a novel high step-up DC-DC converter with coupled-inductor and voltage-doubler circuits is proposed. The converter achieves high step-up voltage gain with appropriate duty ratio and low voltage stress on the power switches. Also, the energy stored in the leakage inductor of the coupled inductor can be recycled to the output. The operating principles and the steady-state analyses ...
This paper presents the operational modes and the design of the active clamp flyback inverter. The auxiliary switch, clamp capacitor (Cclamp) and resonant inductor (Lr) are used in flyback inverter to minimize the spike voltage at the transformer primary side. Therefore, the voltage stress of main switch can be decreased. The active clamp circuit can also help the main switch in order to achiev...
Gate bias-induced stress has been investigated on sexithiophene-based ransistors. It was found that both a negative and a positive threshold voltage shift can be induced. Temperature-dependent measurements show that there are two processes involved in the negative threshold voltage shift, one occurring at T 220 K and the other at T 300 K. These two transition temperatures were interpreted in...
We have investigated RF degradation in GaN high electron mobility transistors (HEMTs) with different gate placement in the source-drain gap. We found that devices with a centered gate show different degradation behavior from those with the gate placed closer to the source. In particular, centered gate devices degraded through a mechanism that has a similar signature as that responsible for high...
The aging of insulating materials can be estimated by an electrical breakdown occurring in electrical components so that the relationship between lifetime, failure probability and reliability of electrical components may be studied using the life models in high voltage cables networks. In last decades with attention to higher features as electrical, thermal, mechanical characteristic, widely cr...
Turning to Renewable Energy Sources (RES) is the most logical politics in securing the modern society from critical changes in earth increasing temperature. However, Distributed Generation (DG) sources could lead to new challenges in electricity network, mainly allocation of DG sources in distribution level of power system will set the existing network under stress of power flow parameters. The...
In this work a new embedded negative voltage level converter is presented. The proposed circuit converts a positive input signal to a negative output signal obtaining an increased protection by the high voltage stress on the used MOS devices. This results in higher system reliability in applications where negative pulses are required. The circuit has been designed in a 0.18μm triple-well standa...
A buck–boost-type unity power factor rectifier is proposed in this paper. The main advantage of the proposed rectifier over the conventional buck–boost type is that it can perform input power factor correction (PFC) over a wider voltage conversion range. With a single switch, a fast well-regulated output voltage is achieved with a zero-current switch at turn-on. Moreover, the switch voltage str...
A new high step-up converter is projected for a photovoltaic system. An asymmetrical interleaved high step-up converter achieves high step up gain through a voltage multiplier module. The voltage multiplier module is organised by a conventional boost converter and coupled inductors. A conventional boost converter is incorporated to achieve a considerably higher voltage conversion ratio. This co...
For medium voltage, high power applications 3-phase neutral point clamped AC-DC multilevel converters are becoming a good choice. In this paper the performance of a 3-phase neutral point clamped Active Front End three level converter for high power application with simplified control scheme is presented. A complete mathematical model of the control scheme is developed and performance is investi...
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