This paper presents a new dc-bus voltage control technique for single-phase bidirectional ac/dc converters. The proposed controller is able to significantly improve the transient response of the dc-bus voltage control loop and provide a robust and reliable closed-loop control system. In the proposed approach, the dc value of the dc-bus voltage is precisely estimated through a specific adaptive filter. The structure of the proposed filter provides a very fast and robust estimation for the dc value of the dc-bus voltage. In particular, the proposed dc-extraction technique is able to precisely estimate the dc value in presence of double-frequency ripple mounted on top of the dc-bus voltage in single-phase ac/dc converters. Simulation and experimental results demonstrate the superior performance of the proposed closed-loop control system compared to the conventional ones.

Power electronic converters for Electric Vehicles (EVs) have been the subject of great interest over the last several decades. This paper presents a thorough review of different EV power electronics converters on which the authors have worked for more than one decade. The readers will find this review interesting to design current products and to devise/invent new converters for emerging applications in EV.

In this contribution we report on solution processed red OLEDs based upon an N-annulated perylene diimide dimer, namely tPDI₂N-EH, a red-light emitting molecule.

This article presents a three-port dc/dc converter along with a new control system to integrate solar panels and energy storage in a dc nanogrid. The proposed control system utilizes the duty cycle as well as the switching frequency to control the power flow between the three ports. The proposed converter offers a low number of components, low cost, and high reliability. Moreover, it is capable of providing bidirectional power flow for the energy storage system and the dc grid while having soft-switching for power semiconductors. The converter demonstrates high design flexibility in accommodating different applications. Theoretical analysis and experimental results verify the feasibility and demonstrate the superior performance of the proposed converter.

Wireless power transfer (WPT) for portable electronic applications has been gaining a lot of interest over the past few decades. This study provides a comprehensive review of the recent advancements in WPT technology, along with the challenges faced in its practical implementation. The modeling and design of WPT systems, including the effect of cross-coupling in multiple receivers, have been discussed and the techniques for efficiency improvement have been highlighted. The challenges of coil design, EMI shielding, and foreign object detection have been pointed out and various cutting-edge solutions have been presented. With improvements in wide bandgap technology, there is a push to operate WPT systems at mega-hertz frequencies. The reason for this is twofold: the miniaturization of the system and the ability to achieve a better magnetic link efficiency. However, with higher frequency comes the challenge of operating the power electronic components efficiently by using soft-switching techniques. Hence, an in-depth discussion on soft-switched topologies such as the Class D and Class E converters and their variations has been provided. Finally, the effects of magnetic field exposure on humans along with safety standards have been discussed.

This paper presents a novel resonant power converter for transcutaneous power transmission in retinal prosthesis applications. In retinal prosthetic applications, the frequency and power of the transmitted signal must be limited to a specific range such that the living tissue is not harmed. The design goal is to transmit power with maximum efficiency, and minimum sensitivity to the nonideal power transfer link. The proposed wireless power-transfer circuit offers significant advantages over conventional ones, which usually use Class E converters. The proposed approach has very low sensitivity to coupling factor/load variations in the inductive link and demonstrates very fast dynamic response. In addition, the proposed approach does not require a dc–dc converter to control the output power. Soft switching is achieved for the proposed circuitry despite the variations in the coupling coefficient. Thus, superior efficiency can be obtained using the proposed approach. Theoretical analysis and various simulations validate the superior performance of the proposed approach. In addition, a 1-MHz experimental prototype has been prepared to verify the feasibility of the proposed wireless power-transfer circuit.