Topic
Negative impedance converter
About: Negative impedance converter is a research topic. Over the lifetime, 5801 publications have been published within this topic receiving 87636 citations.
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TL;DR: The condition for the stabilization of the negative capacitance to achieve the voltage amplification across the active layer of the NCFET is presented and the proposed analytical modeling shows good agreement with experimental data.
Abstract: In this paper, we report a detailed study of the negative capacitance field effect transistor (NCFET). We present the condition for the stabilization of the negative capacitance to achieve the voltage amplification across the active layer. The theory is based on Landau's theory of ferroelectrics combined with the surface potential model in all regimes of operation. We demonstrate the validity of the presented theory on experimental NCFETs using a gate stack made of P(VDF-TrFE) and SiO2. The proposed analytical modeling shows good agreement with experimental data.
25 citations
Patent•
14 Apr 2010
TL;DR: A power factor correcting converter includes a DC-DC converter to convert a DC voltage, which is formed by rectifying an AC voltage of an AC power source through a rectifier, into the DC voltage of a DC converter as mentioned in this paper.
Abstract: A power factor correcting converter includes a DC-DC converter to convert a DC voltage, which is formed by rectifying an AC voltage of an AC power source through a rectifier, into a DC voltage of the DC-DC converter and a step-up converter to step up the DC voltage of the DC-DC converter. Secondary windings of a transformer Ta in the DC-DC converter are directly connected to the step-up converter.
25 citations
15 Mar 2015
TL;DR: In this paper, an isolated bidirectional dc-dc converter for medium voltage application is proposed, which combines the resonant converter and dual active bridge converter (DAB) under normal load condition, this isolated converter operates at resonant point to achieve zero voltage (ZVS) turn on at primary side and zero current (ZCS) turn off at secondary side.
Abstract: In this paper, an isolated bidirectional dc-dc converter for medium voltage application is proposed It combines the resonant converter and dual active bridge converter (DAB) Under normal load condition, this isolated converter operates at resonant point to achieve zero voltage (ZVS) turn on at primary side and zero current (ZCS) turn off at secondary side When over current happens, the voltage across the resonant capacitor will be clamped by paralleled diode and the converter will automatically switch to resonant and DAB mixed operation mode, therefore cycle-by-cycle over current protection is achieved with constant switching frequency Different operation modes are analyzed for the proposed circuits using time domain waveform and state trajectory Detailed theoretical analysis and design procedure for transformer, resonant tank and semiconductor devices are discussed Performance of the proposed circuit is verified by a 3 kV to 200 V, 25 kW experimental prototype with high voltage SiC devices
25 citations
Patent•
26 Dec 1990TL;DR: In this article, a voltage demand signal generator is defined as a portion of an engine control circuit for generating a varying voltage level for the power which is dependent on the operating conditions of the internal combustion engine.
Abstract: A control apparatus for an electric fuel pump of a motor vehicle having an internal combustion engine which receives operating fuel from the motor operated fuel pump includes a dc-dc converter connected between a power source and the fuel pump. The dc-dc converter provides power for driving the fuel pump and is responsive to a voltage demand signal for setting the voltage level of the power. In one embodiment of the invention, a voltage demand signal generator, which generates the voltage demand signal, is a zener diode for generating a fixed voltage level for the power independent of the voltage level of the storage battery. In a second embodiment, the voltage demand signal generator is a portion of an engine control circuit for generating a varying voltage level for the power which is dependent on the operating conditions of the internal combustion engine.
25 citations
Patent•
26 Jul 2011
TL;DR: In this article, a method for monitoring the condition of at least one cell of a battery (30) of an electric or hybrid electric vehicle (10) is described. But the battery is connected to a power converter (42) to supply electrical power to an electrical load (50).
Abstract: A method is disclosed of monitoring the condition of at least one cell of a battery (30), for example as used in an electric or hybrid electric vehicle (10). The battery (30) is connected to a power converter (42) to supply electrical power to an electrical load (50). The method includes the steps of: (a) controlling the power converter (42) to vary the input impedance of the power converter (42) so as to draw a varying current from the at least one cell; (b) sensing the voltage across the at least one cell and the current drawn therefrom in response to varying the impedance of the power converter (42); (c) calculating from the sensed voltage and current the complex impedance of the at least one cell; and (d) comparing the calculated complex impedance with information indicative of a correlation between (i) the complex impedance and (ii) information indicative of the condition of the at least one cell, to give an indication of the condition of the at least one cell. The varying current may be actively varied or passively varied.
25 citations