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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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Patent
16 Jan 2013
TL;DR: In this article, a power converter circuit includes at least one converter series circuit having a plurality of converter units, wherein the converters are configured to output a series circuit output current.
Abstract: In accordance with an embodiment, a power converter circuit includes at least one converter series circuit having a plurality of converter units, wherein the at least one converter series circuit is configured to output a series circuit output current. The power converter circuit also includes a synchronization circuit configured to generate at least one synchronization signal. At least one of the plurality of converter units is configured to generate an output current such that at least one of a frequency and a phase of the output current is dependent on the synchronization signal.

36 citations

PatentDOI
TL;DR: In this article, a multi-mode vibration damperformer was proposed by using a pair of piezoelectric patches connected with negative capacitance shunt circuit units, which is capable of suppressing the whole structure modes simultaneously.
Abstract: A novel multi-mode vibration damper is invented by using a pair of piezoelectric patches connected with negative capacitance shunt circuit units. A piezoelectric material connected with a series resistor-negative capacitor branch circuit is capable of suppressing the vibration and/or noise amplitudes in the low frequency range. The other piezoelectric material connected with a parallel resistor-negative capacitor circuit is for suppressing the vibration and/or noise amplitudes in the high frequency range. By combining two negative capacitance shunt circuit units, a multi-mode vibration damper is capable of suppressing the whole structure modes simultaneously. In order to describe the characteristic behaviors of a multi-mode vibration damper, the stiffness ratio and loss factor with respect to the non-dimensional frequency are considered. The mechanism of a shunt damper is also described as considering a shunt voltage generated by the shunt impedance. The example results show that the multi-mode vibration damper reduces the vibration amplitudes of the vibrating system significantly across a broadband frequency range.

36 citations

Patent
25 Mar 2011
TL;DR: In this article, an energy harvesting circuit includes an energy source, a storage capacitor to store energy output from the energy source and a power converter circuit, an energy storage element, and an enabling circuit.
Abstract: An energy harvesting circuit harvests energy from a voltage source and charges a storage element with the harvested energy. The energy harvesting circuit includes an energy source, a storage capacitor to store energy output from the energy source, a power converter circuit, an energy storage element, and an enabling circuit. The enabling circuit turns the boost converter circuit on and off according to a monitored capacitance voltage of the storage capacitor. When the boost converter circuit is turned off, the storage capacitor accumulates energy output from the energy source until a reference voltage is reached, whereupon the boost converter circuit is turned on, enabling current flow from the storage capacitor to the storage element. When the storage capacitor discharges to a minimum voltage level, the boost converter circuit is turned off. The enabling circuit and a reference voltage supply are powered by the energy source.

36 citations

Patent
08 Jun 1999
TL;DR: In this article, an integrated protection circuit was proposed for a power converter with an operation amplifier and an overvoltage protection circuit to limit the output current of the converter to the output when the proportional voltage exceeds a second reference voltage.
Abstract: For use with a power converter having a current sensor that senses an output current of the converter and generates a proportional voltage and a controller having an overvoltage protection circuit associated therewith. The overvoltage protection circuit includes a voltage sense input coupled to an output of the converter and a first reference voltage input, an integrated protection circuit, method of providing current-limiting and short-circuit protection and power converter employing the same. In one embodiment, the integrated protection circuit includes an operation amplifier circuit, coupled between the current sensor and the controller, that generates a voltage signal and causes the controller to limit a current supplied by the converter to the output when the proportional voltage exceeds a second reference voltage. The integrated protection circuit also includes a conductive path, coupled between the operational amplifier circuit and the overvoltage protection circuit, that provides a path to apply the voltage signal to the voltage sense input when the proportional voltage exceeds the second reference voltage. The overvoltage protection circuit causes the controller to disable the converter when a voltage sensed at the voltage sense input exceeds a first reference voltage by a specified value. The integrated protection circuit thereby provides current-limiting and short-circuit protection for the converter.

36 citations

Journal ArticleDOI
21 May 2003
TL;DR: In this article, a bidirectional phase-shifted DC-DC converter with zero current switching (ZCS) and zero voltage switching was used to extend the load range of the converter by applying both ZCS and ZVS.
Abstract: The work described is based on a bidirectional phase-shifted DC-DC converter that conventionally suffers from the restricted load range and nonlinear control of the output voltage. The concepts developed are used to extend the load range of the converter by applying both zero current switching (ZCS) and zero voltage switching (ZVS). In addition, the control to output voltage characteristics of the converter is improved to be more linear over the large load range.

36 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202330
2022104
2021120
2020131
2019134
2018155