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Voltage regulator

About: Voltage regulator is a research topic. Over the lifetime, 33536 publications have been published within this topic receiving 350859 citations.


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Patent
23 Mar 1970
TL;DR: In this paper, the negative temperature coefficient of the base-to-emitter voltage a first transistor in conjunction with the positive voltage differential between two additional transistors operating at different current densities is used to achieve a zero temperature coefficient reference potential.
Abstract: An integrated circuit regulator including a temperature stable constant voltage reference wherein the negative temperature coefficient of the base-to-emitter voltage a first transistor in conjunction with the positive temperature coefficient of the base-to-emitter voltage differential between two additional transistors operating at different current densities is used to achieve a zero temperature coefficient reference potential. The constant voltage reference is combined with a voltage follower and provides a source of constant current which is passed through an external variable resistance to develop a selectable and predictable adjustment voltage for driving the voltage follower so as to cause an unregulated input voltage applied thereto to be regulated at an output terminal.

86 citations

Proceedings ArticleDOI
16 Jul 2000
TL;DR: In this article, a new measure, power margin, is introduced to describe the proximity to voltage collapse in terms of power, and the results of work on the effects of contingencies and system dynamics on the VIP are also presented, extending the prior work that assessed the effectiveness of the VIP under conditions of increased power transfers.
Abstract: In previous work concerning the Voltage Instability Predictor (VIP), the proximity to voltage collapse (or instability) was expressed in terms of distance between two voltage curves or between two impedance curves. In this paper, a new measure, power margin, is introduced to describe the proximity to collapse in terms of power. The results of work on the effects of contingencies and system dynamics on the VIP are also presented, extending the prior work that assessed the effectiveness of the VIP under conditions of increased power transfers, using power flow simulations to examine voltage collapse conditions. These results show that the VIP algorithm successfully predicted voltage instability where conventional protection devices, using only voltage inputs, did not.

86 citations

Patent
17 Oct 2003
TL;DR: A radio frequency amplification stage comprising an amplifier for receiving an input signal to be amplified and a power supply voltage, comprising an ac amplifier for amplifying a difference between the reference signal and one of the selected supply voltage level or the adjusted selected power supply level, and a summer for summing the amplified difference with the selected power voltage to thereby generate the adjusted supply voltage as mentioned in this paper.
Abstract: A radio frequency amplification stage comprising: an amplifier for receiving an input signal to be amplified and a power supply voltage; and a power supply voltage stage for supplying said power supply voltage, comprising: means for providing a reference signal representing the envelope of the input signal; means for selecting one of a plurality of supply voltage levels in dependence on the reference signal; and means for generating an adjusted selected power supply voltage, comprising an ac amplifier for amplifying a difference between the reference signal and one of the selected supply voltage level or the adjusted selected supply voltage level, and a summer for summing the amplified difference with the selected supply voltage to thereby generate the adjusted supply voltage.

85 citations

Journal ArticleDOI
TL;DR: In this paper, the impact of wind power penetration by doubly fed induction generator (DFIG) on power system oscillations for two-area interconnected power system is analyzed with and without the wind energy penetration.

85 citations

Journal ArticleDOI
TL;DR: In this paper, the authors focus on the common dc-link voltage between a three-phase diode rectifier and a modular multilevel cascade inverter based on double-star chopper cells (MMCI-DSCC) for a medium-voltage motor drive.
Abstract: This paper focuses on the common dc-link voltage between a three-phase diode rectifier and a modular multilevel cascade inverter based on double-star chopper cells (MMCI-DSCC) for a medium-voltage motor drive. This motor drive can be operated even when no capacitor exists on the dc link. However, a nonnegligible, but predictable, amount of switching-ripple voltage occurs on the dc link. This paper achieves modeling and analysis of the switching-ripple voltage, thus making it possible to design a small-sized dc passive filter consisting of series connection of a film capacitor and a damping resistor. A 400-V, 15-kW down scaled system is used to confirm the effectiveness of the analysis and the dc filter. Experimental results show that the switching-ripple voltage can be attenuated satisfactorily by the dc filter, and that the power loss dissipated in the damping resistor is negligible, compared to the rated power of 15 kW.

85 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202382
2022212
2021320
2020699
2019947
2018973