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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Papers
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30 Jul 2004TL;DR: In this paper, an apparatus for reducing the heat losses caused by the DC Bus capacitor current was proposed. But the authors did not consider the effect of the DC bus capacitor current on the full-bridge DC-DC converter.
Abstract: An apparatus for reducing the heat losses caused by the DC Bus capacitor current is proposed. The apparatus includes: a double frequency boost converter circuit having two boost converter circuits coupled in parallel, in which two switches, respectively disposed on the two boost converter circuits, are turned on and off alternately to produce an output current having a frequency twice that of control signals of the two switches, and to offer a DC bus respectively, a full-bridge DC-DC converter coupled to an output terminal of the double frequency boost converter circuit for transforming an output of the DC bus to a DC voltage, and a DC bus capacitor coupled to the double frequency boost converter circuit and the full-bridge DC-DC converter in parallel for balancing two corresponding transient powers of the double frequency boost converter circuit and the full-bridge DC-DC converter respectively.
35 citations
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TL;DR: In this article, the authors presented an experimentally validated piezoelectric-based energy sink (NES) for wideband vibration attenuation, which consists of a negative capacitance shunt combined in series with a nonlinear capacitance of cubic order.
35 citations
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15 Nov 2007
TL;DR: In this paper, a control circuit for controlling a current flow through a load is disclosed, which consists of a power converter, a controller and a current control circuit, and the controller couples to the power converter and adjusts the control signal according to the second voltage signal so that the second-voltage signal is maintained at a predetermined value.
Abstract: A control circuit for controlling a current flow through a load is disclosed. The circuit comprises a power converter, a controller and a current control circuit. The power converter converts a first voltage signal to a second voltage signal according to a control signal. The controller couples to the power converter and adjusts the control signal according to the second voltage signal so that the second voltage signal is maintained at a predetermined value. The current control circuit is coupled to the load, and controls the current flow through the load according to a dimming signal to control the load.
35 citations
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TL;DR: In this article, a new approach to online AC impedance measurement at high frequency is proposed by paralleling a DC/DC converter with the PEM fuel cell stack, and an experiment is performed on a 30kW stack of 120-serial cells.
35 citations
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IBM1
TL;DR: In this paper, a method of controlling the operation of a breaker in a transmission line by first monitoring the current and if the current exceeds a prescribed limit, measuring a sampling of the voltage on the line when the current is at zero and dividing this value by the maximum current, is presented.
Abstract: A method of controlling the operation of a breaker in a transmission line by first monitoring the current and if the current exceeds a prescribed limit, measuring a sampling of the voltage on the line when the current is at zero and dividing this value by the maximum current on the line to obtain a first quantity which is added to a second quantity obtained by measuring a sampling of the voltage when the current is at its maximum value and dividing this voltage by the maximum current. The previous calculations will provide a measure of impedance since the voltage when the current is zero is equal to Vm sin phi while the voltage when the current is at maximum is equal to Vm cosine phi and impedance in a rectangular coordinate representation is: z R jX Vm cosine phi /Im + j(Vmsin phi /Im). This apparent impedance is then compared against relay characteristics which are implemented in a programmed general purpose computer and in the event the apparent impedance lies within the relay characteristic zone, the associated breaker is tripped.
35 citations