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Output impedance

About: Output impedance is a research topic. Over the lifetime, 11185 publications have been published within this topic receiving 134949 citations.


Papers
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Proceedings ArticleDOI
15 May 2013
TL;DR: In this article, a method of impedance matching for wireless power transfer (WPT) to multiple receivers is presented considering cross coupling effects between non-adjacent coils, where the design of a source coil and optimal load impedance are achieved based on circuit analysis and mutual inductance calculation.
Abstract: In this paper, a method of impedance matching for wireless power transfer (WPT) to multiple receivers is presented considering cross coupling effects between non-adjacent coils. For maximizing power transfer efficiency, design of a source coil and optimal load impedance are achieved based on circuit analysis and mutual inductance calculation. For verification, a WPT system of a transmitter and three receivers is fabricated. The fabricated WPT system can obtain reflection coefficient of under -11 dB for the maximum three receivers at once by using a circular single loop coil without capacitance compensation or additional impedance matching circuit. The simulated results show that the WPT system using the proposed method has more than 85% efficiency regardless of the number of receivers while efficiency for the conventional method is severely changed according to the number of the receivers. Measured results of the proposed method are consistent with calculation results.

35 citations

Proceedings ArticleDOI
02 Apr 2008
TL;DR: In this paper, the voltage controllable inductance circuit, which is composed of resistors, capacitors and OP-AMPs, is applied to the proposed line coupling circuitary.
Abstract: The access impedance of the power line channel is time variant. This feature of the power line channel is the main cause of impedance mismatching between the access impedance of the power line channel and the output impedance of the power line communication system and impedance mismatching lead to the problem of reducing the communication range. Therefore, it is very important to match between the access impedance of the power line channel and the output impedance of the power line communication system for the expansion of the communication range. The impedance matching can be achieved to change the output impedance of the line coupling circuitary. In this paper, the voltage controllable inductance circuit, which is composed of resistors, capacitors and OP-AMPs, is applied to the proposed line coupling circuitary. The proposed line coupling circuitary is smaller and more flexible than other existing line coupling circuitary for the adaptation to channel. Though, the proposed line coupling circuitary has the limited operation range, the maximum power transmission is achieved in the limited range. The proposed line coupling circuitary is simulated and measured to confirm its performances.

35 citations

01 Jan 2011
TL;DR: In this paper, a new quadrature oscillator circuit using two multiple outputs second-generation current conveyors (CCIIs), three grounded capacitors and three resistors is presented.
Abstract: A new quadrature oscillator circuit using two multiple outputs second-generation current conveyors (CCIIs), three grounded capacitors and three resistors is presented. Two high output impedance current-mode signals and two voltagemode signals each pair with 90 ° phase difference are available in the proposed circuit. The oscillation condition and oscillation frequency are independently controllable through grounded resistors. The use of only grounded capacitors makes the proposed circuit attractive for integrated circuit implementation.

35 citations

Journal ArticleDOI
TL;DR: Simulations using PLECS and experiments on a real commercial modular UPS are developed to verify the effectiveness of the proposed control methodology, showing a superior power sharing performance is obtained when using the proposed method.
Abstract: In this paper, an average active power sharing control strategy based on the distributed concept for the parallel operation of voltage source inverters is proposed to be applied to the modular uninterruptible power supply (UPS) systems The presented method is named distributed adaptive virtual impedance control (DAVIC), which is coordinated with the droop control method Low bandwidth CAN-based communication is used for the requirement of data sharing of the proposed method in the real modular UPS system Unlike the conventional virtual impedance control techniques, the virtual impedance of a converter module is adjusted automatically by using global information when DAVIC is applied, further to tune the output impedance of the power modules The adaptive virtual impedance is calculated by using the difference between the active power of a local module and the average active power of all the modules in a modular UPS The DAVIC overcomes the drawback of the conventional virtual impedance control since an accurate value of the real output impedances of different converter modules is not required Simulations using PLECS and experiments on a real commercial modular UPS are developed to verify the effectiveness of the proposed control methodology These results shown a superior power sharing performance is obtained when using the proposed method

35 citations

Patent
25 Nov 2003
TL;DR: In this paper, a method to tune an adjustable on-chip impedance within a predetermined range that involves establishing a reference current for the adjustable onchip impedance and applying this reference current to the adjustable impedance is presented.
Abstract: A method to establish an adjustable on-chip impedance within a predetermined range that involves establishing a reference current for the adjustable on-chip impedance and applying this reference current to the adjustable on-chip impedance. A voltage produced by applying the reference current to the adjustable on-chip impedance is sensed and compared with the comparator or other similar processor to a reference voltage. This comparison allows the adjustable on-chip impedance to be tuned when the comparison of the sense voltage and the reference voltage is unfavorable. Tuning the impedance results in an impedance value within a predetermined range that accounts for variances of both the reference current and reference voltage.

35 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202347
2022140
2021182
2020285
2019366
2018377