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In this paper, a novel LLC resonant converter with parallel input and parallel output circuit topology is proposed to achieve the good performance of reduced switch count and medium power compared with conventional parallel half-bridge resonant converter. The proposed LLC resonant converter has two resonant circuits, two resonant circuits use the same power switches to transmit power so that the switch...
This work develops a novel single-switch current-fed series-parallel resonant converter for use in direct current (DC) energy conversion systems. The converter comprises a class-E inverter and a series-parallel resonant tank with a bridge rectifier. It uses a single active power switch to reduce the cost of the energy conversion system and control circuits. With a simple circuit configuration and...
In this paper, an architecture of a single-stage power factor corrected AC-DC converter controlled by a high voltage resonant controller IC L6598 is proposed as LED street lighting driver. The converter is formed by the integration of two boundary conduction mode (BCM) boost circuits and a half-bridge LLC resonant circuit. The converter adapts dual half-wave rectifiers at the output side that supply...
Maximum power transfer is a significant issue in wireless power transfer system, the common used method is impedance matching to track the optimal impedance point by using a power electronic converter. However, in a practical WPT system, the coupling coefficient will drift from the designed value due to the air gap, receiver structure and other environmental influence. As a result, the optimal impedance...
In this paper a mathematical model for a resonant multilevel converter is presented. The topology has been conceived to be used in X-ray power supplies. The power stage has been designed to minimize the resonant current throughout the input voltage range: 400V to 750V. The inverter stage is based on the series-parallel resonant topology, LCC, to include the parasitic elements of the step-up transformer...
This paper presents a new single-stage AC/DC step-up soft-switched converter for medium voltage (MV) DC grid for wind energy systems. To achieve close-to-unity power factor, stepping up the voltage and reduce the number of conversion stages, a three-phase boost AC/DC rectifier and a high frequency step-up resonant converter with high gain rectifier modules are combined into a single-stage step-up...
This work presents a novel current-fed parallel-loaded resonant converter that operates under the zero-voltage-switching (ZVS) condition. The circuit configuration is obtained by integrating the class-E resonant inverter into the parallel-loaded resonant converter. With suitably set circuit parameters, only one power switch can exhibit ZVS condition. Thus, high energy conversion efficiency is achieved...
This paper introduces a robust, hardware efficient, mixed-signal control loop that governs the switching actions of the secondary-side synchronous rectifier (SR) switches of LLC resonant converters. The new SR control method minimizes switching and conduction losses of the SR switches through online optimization of their on-off timing using an auto-tuning process that takes into account the effect...
Conventional offshore wind farms with medium voltage (MV) AC grid require low frequency step-up transformer to boost the output voltage of the wind turbine. In order to eliminate the bulky MV step-up transformers in MVAC grid, the use of a MV step-up DC/DC converter in MVDC grid is an attractive alternative. In this paper, two modular MV step-up DC/DC converter topologies that combine multiple modules...
The aim of this paper is to explore the switching capability of an improved high-voltage Super Junction MOSFET in half bridge resonant LLC converter. Due to suitable technological process, a considerable reduction in silicon conduction losses per area unit has been observed. Moreover, a reduction in the parasitic capacitance (i.e. gate charge) with an improved switching behavior has been obtained...
The pulsed power supply (PPS) with capacitor energy storage is the integral part of launch system, which is often used as energy storage element for electrothermal-chemical (ETC) launch, electromagnetic launch (EML), and other new-concept launch technology. In order to make capacitor charged rapidly, a novel capacitor charging power supply (CCPS) has been developed in this paper characterized by compact...
This paper describes the analysis and performance of the series resonant DC-DC converter using soft switching technique, which is a promising and convincing solution method for switched mode electronic power converter. The operating modes classifications are mentioned in this work. The converter behavior above the resonant frequency is also explained in detail. The validity of the analyzed converter...
In this paper, LLC series resonant converter with current-doubler as a rectification circuit for secondary side is proposed. The current-doubler circuit is generally used for the high voltage input and low voltage output application to get high efficiency characteristics with reduced transformer turn ratio. However, an inductive circuit is not used in a secondary side for the LLC series resonant converter...
This work proposes a novel battery charger circuit with an improved parallel-loaded resonant converter use in rechargeable batteries in mobile power applications. The proposed topology is composed of an improved parallel-loaded resonant inverter and a bridge rectifier. The output voltage of the improved parallel-loaded resonant converter is filtered by an electrolytic capacitor. This topology has...
This paper presents a new synchronous rectifier method for a LLC resonant converter with voltage-doubler. The pulse width of secondary rectifier cannot be obtained in LLC resonant converter based on the primary side current because primary current include not only the current that is transferred to the secondary side but also the magnetizing current. In the proposed method, the pulse width of synchronous...
This paper describes the design of 100kVA EV (electric Vehicle) Charger which outputs 750V/150A. For the requirement of different type of EV, 13 units are in series; this can make the output voltage as the following: 40V–60V, 400V–600V or 500V–750V, and output voltage and current of each unit are 48V/150A. AC/DC of unit is Buck-type converter, this makes 350V of DC bus; it is very cheap for selection...
In the developed trend of high efficiency and high density power, LLC resonant converter has become a research focus. This paper analyzes the working principle of LLC resonant circuit and synchronous rectification scheme with secondary current Self-driven type and to design and verify the circuit based on the chip UCC25600. The results show that the LLC resonant converter has advantages of high converting...
On the condition of fs <; fr/2, series-resonant converter has the characteristics of constant-current linear charging for small capacitance loads and soft-switching, and six kinds of models in one switching period are analyzed, and formulas of resonant current and resonant voltage are given. By utilizing the constant-current linear charging just like "average charging" for voltage-doubling...
This paper presents an analysis of the effect of duty ratio on power loss and efficiency of the transcutaneous energy transmission system (TETS) with a class-E power amplifier. Conduction loss for each component of the TETS circuit is derived and the total efficiency of the TETS is expressed as functions of the duty ratio D . Three identical TETS at D = 0.25 , 0.5 and 0.75 are designed, constructed...
This paper presents a high-efficiency isolated boost DC-DC converter with low-voltage high-current input based on a new principle of natural commutation. The proposed circuit comprises interleaved full-bridge DC-AC inverters on primary and parallel-connected bridge-rectifiers on the secondary side of a high-frequency isolation transformer. Commutation between inverters is established by the voltage...
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