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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
09 Jul 2004
TL;DR: In this article, a circuit for limiting a power current from a power-controlling pass device, coupled to a supply voltage, comprises the following: a sense device is coupled to the supply voltage with the sense device being configured to draw a sense current that is proportional to the power current.
Abstract: A circuit for limiting a power current from a power-controlling pass device, the power-controlling pass device being coupled to a supply voltage, comprises the following. A sense device is coupled to the supply voltage with the sense device being configured to draw a sense current that is proportional to the power current. A current mirror is coupled to the sense device and the supply voltage through a low impedance node, the current mirror being configured to draw a mirror current through the low impedance node that is relative to the sense current. A limiting device is coupled to the supply voltage, the power-controlling pass device, and the low impedance node, the limiting device being configured to limit the power current according to a voltage difference between the low impedance node and the supply voltage.

26 citations

Proceedings ArticleDOI
22 Apr 2013
TL;DR: In this paper, a fixed frequency, modified series resonant converter (SRC) with capacitive output filter using a modified gating scheme is proposed and steady state analysis of the converter using approximate complex ac circuit analysis method is presented.
Abstract: A fixed frequency, modified (or LCL-type) series resonant converter (SRC) with capacitive output filter using a modified gating scheme is proposed. Steady-state analysis of the converter using approximate complex ac circuit analysis method is presented. Based on the analysis, a simple design procedure is given and illustrated with a design example of a 22 to 41 V DC input, 1 kW, 380 V. Due to the increased number of switches operating with zero-voltage switching, this converter with the modified gating scheme gives higher efficiency as compared to that with the regular phase-shift gating scheme. With minimum input voltage this converter requires a narrow variation in pulse-width for a wide variation in the load current while the peak current through the switches decrease with the load current. Detailed PSIM simulation results are presented to substantiate the performance of the designed converter for varying input voltage and load conditions. Also, an experimental converter of input voltage 50 to 100 V, 200 W, 200 V has been built and waveforms obtained using the experimental setup are presented.

26 citations

Journal ArticleDOI
TL;DR: In this article, a magnetically coupled DC/DC converter is proposed for medium power applications (250 W to 2 kW), requiring a highvoltage gain, short inductive charging time and galvanic isolation.
Abstract: A new form of magnetically coupled DC/DC converter is proposed for medium power applications (250 W to 2 kW), requiring a high-voltage gain, short inductive charging time and galvanic isolation. The proposed converter can be realised using a unique Y-source impedance network and a two-switch push-pull circuit with voltage-doubling rectification. The converter's voltage gain is presently not matched by any other converter operating at the same switch duty ratio. The converter also has more degrees of freedom in design for setting the desired gain than other converters, and hence can better meet the demands of many applications. The operating principles of the converter have been analysed mathematically, and are verified by both simulation and experiment.

26 citations

Patent
16 Jan 2003
TL;DR: In this paper, a duty-ratio setting circuit for DC-DC converters with wide ranges of input and output voltages is presented. But the duty ratio is not defined.
Abstract: A DC—DC converter in which no operational instability occurs and ranges of input and output voltages are wide, an electric appliance using such DC—DC converter, and a duty-ratio setting circuit in which no operational instability occurs and ranges of input and output voltages of a converter circuit can be widen in controlling the converter circuit are provided. A DC—DC converter 10 has a converter circuit 110 , an output voltage detection circuit 120 and a duty-ratio setting circuit 20 . An error amplifier circuit 21 compares Vref 1 with Vd to output a control voltage Vfb. A pulse-width modulator circuit 25 compares a triangular-wave voltage Vct with the control voltage Vfb to output a first pulse signal PWO. A second-pulse generator circuit 26 outputs a second pulse signal PSO having a predetermined on-duty ratio. A selector circuit 27 selects the first pulse signal PWO or the second pulse signal PSO according to the control voltage Vfb to output the selected signal to a transistor M 1 as a rectangular-wave signal PS.

26 citations

Proceedings ArticleDOI
06 Jul 2011
TL;DR: In this paper, the authors proposed an equivalent circuit and power transmission model of MMC, based on which, the idea that control the current of positive leg and negative leg independently is brought up and a new multi-hierarchy method to balance the capacitor voltages is deduced.
Abstract: The Modular Multilevel Converter (MMC) is an emerging and highly attractive multilevel converter topology for medium and high voltage applications. In this paper, the equivalent circuit and power transmission model of MMC is proposed, based on which, the idea that control the current of positive leg and negative leg independently is brought up and a new multi-hierarchy method to balance the capacitor voltages is deduced. First, the average voltage of all submodules in a phase leg is got as a feedback to regulate the dc component of current command, which controls the average voltage of capacitors in a phase leg. Second, by adding active current to the positive leg current command and reverse phase active current to the negative leg can balance the average voltage of the capacitors in positive leg between negative leg. Third, a compensate signal which is added into the PWM control signal of each submodule makes each capacitor voltage in a leg balanced. The feasibility of independent leg current control, as well as the effectiveness of voltage-balancing control is verified by simulation.

26 citations


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