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In this paper, a frequency-doubling LLC resonant converter with high step-down voltage gain for high input voltage applications is proposed. The three-level structure consisting two series half bridges is adopted in the converter to reduce the voltage stresses of the primary-side switches to only half of the input voltage. Thus the low-voltage rated power devices could be used to improve the converter...
An adaptive secondary-side digital control is proposed for the series resonant converter to solve the loss of ZVS under certain input and load conditions, making it a good candidate for MHz 48V voltage regulators (VRs). By means of varying AC equivalent resistance, the output voltage regulation is achieved by controlling the duty cycle of the synchronous MOSFET. An additional control variable has...
This paper presents a GaN Transistor based 90W ac/dc adapter with a Buck-PFC stage and an isolated Quasi-Switched-Capacitor (QSC) dc/dc stage. In the dc/dc stage, two different QSC converters are proposed. Compared to Flyback and LLC resonant converters, the QSC converters feature: 1) reduced voltage stress on the primary-side switches to 2/3 of the input voltage; 2) reduced voltage stress on the...
Induction cookers are usually designed to deliver up to several kilowatts per burner, working above 20 kHz. These appliances are arranged by means of planar-spiral inductors, made of conventional multi-stranded litz-wire, whose size can reach up to tens of centimeters. In this work, a PCB implementation of such inductors is proposed in order to replace the conventional windings, with the objective...
Conventionally in wireless power transfer applications, symmetrical resonant tank (SRT) type, which employs an identical physical geometry for transmitter coil (Tx) and receiver coil (Rx), has been popular because it minimizes the leakage flux. However, for portable applications it is desirable to minimize size and weight of Rx, while Tx should provide stronger and more uniform magnetic field. Consequently,...
In order to improve the input impedance of stacked boost converter (SBC) that processes only a part of the total power delivery, the traditional three-capacitor structure is optimized as single-capacitor structure in this paper. Then small signal models of push-pull SBC based on these two capacitor structures are set up, the loop gain and input impedance are analyzed and compared. Finally, the effectiveness...
This paper presents the output current balancing method for three-phase interleaved full-bridge LLC resonant converter which employs a Y-connected rectifier. The proposed Y-connected rectifier is capable of boosting the output voltage without increasing the transformer's turn ratio. Especially, the frequency of the output ripple of the rectifier is six times higher than the switching frequency, thereby...
This paper presents the first, off chip, class DE (resonant half bridge) converter working in the Very High Frequency (VHF) range. The benefits of using half bridge circuits both in the inverter and rectifier part of a VHF resonant dc/dc converter are analyzed and design equations for all components in the power stage are given. The circuit has been simulated to verify the accuracy of the presented...
A new isolated push-pull very high frequency (VHF) resonant DC-DC converter is proposed. The primary side of the converter is a push-pull topology derived from the Class EF2 inverter. The secondary side is a class E based low dv/dt full-wave rectifier. A two-channel multi-stage resonant gate driver is applied to provide two complementary drive signals. The advantages of the converter are as follows:...
In this paper, a new hybrid resonant bridgeless ac-dc PFC boost converter operating in continuous-conduction-mode (CCM) is proposed for neighborhood electric vehicle (NEV) battery charging. This hybrid-resonant boost converter has two active switches that operate in pulse-width modulation (PWM) and hybrid-resonant modes of operation. This combined modulation technique is called hybrid resonant PWM...
In this paper, a plug-in electric vehicle battery charger is proposed based on SEPIC PFC and LLC topologies. In addition, a new approach in introduced to actively control the dc link voltage and track the maximum efficiency point of a LLC converter over the wide voltage range of the high voltage battery pack. Comprehensive circuit modeling and loss analysis at maximum efficiency point of LLC converter...
The purpose of this paper is to study the feasibility of a resonant high voltage generator using a high voltage planar transformers. The emphasis is on improving the power density, efficiency, reliability, and repeatability of component characteristics of the planar high voltage transformer by a novel planar winding design. Converter and transformer design issues are discussed and a prototype is evaluated...
A bidirectional secondary LLC resonant converter with auxiliary switches and an additional inductor is proposed to achieve the high gain characteristics of LLC resonant convertors. Auxiliary switches, an additional inductor and a resonant capacitor are connected in the high voltage secondary side of the proposed converter. The ac analysis and operating characteristics of bidirectional secondary LLC...
This paper proposes the simple and seamless operation technique for bi-directional LLC converter. Generally, bi-directional operation of LLC converter is complicated and difficult to control. Because, the switching frequency has to be changed across fsr (series resonant frequency) and the switching sequences has to be also changed due to resonant characteristics. In order to simplify the switching...
The increasing use of power electronics devices tends to aggravate high-frequency harmonics and trigger resonances across a wide frequency range into power systems. This paper presents an active damper to suppress multiple resonances with unknown frequencies. The active damper is realized by a high-bandwidth power converter that can selectively dampen out the wideband resonances. A cascaded adaptive...
LCL filter is the common interface between the Pulse Width Modulated Voltage Source Converter (PWM VSC) and the utility grid due to high harmonic attenuation capability and reduced size of the passive elements. The present paper investigates the most promising passive damping methods for the LCL topology but also propose an overview of high order filters capable to offer even more attenuation than...
Microelectromechanical systems (MEMS) resonators on Si have the potential to replace discrete L-C components in series resonant converters. With acoustic coupling rather than inductive coupling, these MEMS resonators achieve better electromagnetic interference (EMI) performance, and reduce size, weight and volume of the power converter. In this paper, ring shaped piezoelectric microresonators are...
In this paper, a novel approach to determine the small signal model of an LLC resonant converter is presented. The proposed model uses analysis techniques from communications theory to determine the control-to-output transfer function required for the design of a digital compensation network. The model considers the effects of higher order harmonics and sideband frequencies generated by the variable...
In this paper, the small-signal model of LLC resonant converter is derived using extended describing function (EDF) methodology and the dynamics of the LLC resonant converter are studied based on the small signal model taking into account the circuit parasitic resistance. When designing the controller, this damping effect induced by the parasitic resistance is usually neglected. While it will be shown...
Based on Extended Describing Functions technique, small-signal modeling technique is applied to Series-Series compensated Induction Power Transfer (IPT) system. The derived model includes both frequency control and phase shift control. The derived model is in good agreement with the simulation results obtained from Simplis software.
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