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: In this paper, a new extendable multi-input step-up DC-DC converter (MISUC) topology is proposed to efficiently interface multiple (renewable/non-conventional) energy sources of different output characteristics with a common load.
79 citations
TL;DR: In this paper, an electrochemically polarized AISI 316L stainless steel in a 5% NaCl solution at room temperature was used to measure the impedance and resistances of three polarization sweep rates: 0.10, 0.30 and 0.40 mV−s−1.
78 citations
Patent•
15 Jun 1999TL;DR: In this paper, an improved reverse voltage protection circuit that protects sensitive electronic devices from damage due to both reversed battery connections and source voltage interruptions is presented, where an N-channel protection FET is inversely connected between the negative terminal of the protected device and ground, and the conduction of the protection is extended during a reverse transient protection period following interruption of the source voltage.
Abstract: An improved reverse voltage protection circuit that protects sensitive electronic devices from damage due to both reversed battery connections and source voltage interruptions. An N-channel protection FET is inversely connected between the negative terminal of the protected device and ground, and the conduction of the protection FET is extended during a reverse transient protection period following interruption of the source voltage. A capacitor connected across the gate-to-source circuit of the protection FET is charged from the source voltage through a low impedance charging circuit including a diode to prevent the capacitor from discharging, and is discharged during an interruption of the source voltage through a high impedance discharging circuit connected in parallel with the charging circuit.
77 citations
TL;DR: In this article, the experimental and simulation results of capacitance of quantum well infrared photodetectors (QWIPs) were reported and it was shown that the QWIP capacitance displays unusual behavior as a function of voltage and frequency, deviating far from the constant geometric capacitance value.
Abstract: We report experimental and simulation results of capacitance of quantum well infrared photodetectors (QWIPs). We found that the QWIP capacitance displays unusual behavior as a function of voltage and frequency, deviating far from the constant geometric capacitance value. At high voltages, capacitance starts with a negative value at low frequencies, increases above zero with frequency, and eventually decays to the geometric capacitance value. The magnitude of negative capacitance exceeds the geometric capacitance by more than two orders of magnitude. Negative capacitance arises when the transient current in response to a voltage step is nonmonotonic with time. Simulation shows that this effect is due to nonequilibrium transient electron injection from the emitter resulting from the properties of the injection barrier and inertia of the QW recharging processes.
76 citations
TL;DR: An interleaved nonisolated dc–dc converter with high-voltage gain and zero-voltages switching (ZVS) performance is presented and the reverse current recovery problem is alleviated.
Abstract: This paper presents an interleaved nonisolated dc–dc converter with high-voltage gain and zero-voltage switching (ZVS) performance. Both coupled inductor and voltage multiplier cell techniques are used to increase the voltage gain. The ZVS circuit is composed of an active clamp which is in series with the output filter capacitors. This will give rise to further extension of the voltage gain. Applying the interleaving technique at the input of the converter, the ripple of the input current is reduced. Due to the leakage inductances of coupled inductors, the diodes are turned-off under zero-current switching condition. Hence, the reverse current recovery problem is alleviated. The steady-state analysis of the proposed converter is also presented. Finally, a 900-V to 415-W laboratory prototype is implemented to validate the performance of the proposed converter.
76 citations