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Fast switching power supplies allow to reduce the size and cost of external passive components. However, the capacitive switching losses of the power stage will increase and become the dominant part of the total losses. Therefore, resonant topologies are the known key to reduce the losses of the power stage. A power switch with an additional resonant circuit can be turned on under soft-switching conditions,...
A series resonant tank in the quasi-Z-source (qZS) DC-DC converter with a voltage doubler rectifier could significantly increase the input voltage regulation range by adding the buck mode realization possibility. This paper discusses two different control approaches of the qZS series resonant DC-DC converter in the buck mode: variable frequency control and phase shift modulation. Both methods are...
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, an LLC resonant dc-dc converter is proposed for high voltage applications. Full bridge inverter, LLC resonant tanks, high voltage transformer and full bridge rectifier are comprised in the proposed converter circuit. In operating frequency of proposing converter, output voltage regulation is achieved by narrow varying. The energy trapped in leakage inductance of the transformer and...
The paper deals with investigation of electrical properties of resonant converter with LC2L2C2 resonant network. Main circuit of proposed converter consists of two series LC resonant branches and of two parallel LC sinusoidal output filters. First the topology of proposed converter is being described, whereby main focus is given for application field and on possibility of its variable use. After it...
This paper proposes a novel switched-capacitor balancing topology with an auxiliary inductor to reduce the total energy loss and improve the efficiency. More specifically, the balancing circuit couples the switched capacitor and the auxiliary inductor together to form a resonant switch unit. The simulation model of the resonant circuit is established and analyzed. Experiments also are performed to...
Constant current control is a difficult issue for LLC resonant converter due to its variable frequency operation. After detailed analysis on the short circuit operation of conventional LLC DC-DC converter, a novel current-limiting method with the help of diode clamping is proposed. Against the conventional wisdom, the switching frequency is reduced toward zero to control the output current under over-load...
The diode-clamped multilevel topology has the problem of voltage unbalance of dc link capacitors. This problem can be solved by different methods such as using separate dc sources instead of dc link capacitors, or adding auxiliary circuits to the conventional diode clamped inverter or adopting space vector modulation control, up to three-level inverter applications. For more level applications, the...
This paper presents a new DC/DC converter for high input voltage and high load current applications. In order to adopt low voltage rating power devices in high voltage applications, two split capacitors with four active switches are used in the primary side to reduce the voltage stress of power switches at Vin/2. Two flying capacitances are used in order to automatically balance two split capacitor...
This paper presents a zero voltage switching (ZVS) converter with three resonant tanks to reduce switching losses on power semiconductors, to achieve primary side current sharing and to lessen transformer secondary winding with a full-wave rectifier. Three resonant converters with the same power switches are adopted at low voltage side to reduce current rating on transformer windings. Using series-connection...
This paper presents a new resonant converter to achieve soft switching on power devices. Two full-bridge converters are connected in series to clamp the voltage stress of power switches at Vin/2. Thus, power MOSFETs with 650V voltage rating can be used for 1300V input voltage applications. Two flying capacitors are connected on the AC side of two full-bridge converters to automatically balance two...
Class E resonant inverter is often applied to design a high frequency AC power source. Based on the zero voltage switching (ZVS) operation, the class E converter has high converting efficiency even the converter works at high frequency. In general, the output power needs to be controlled for practical application. The power output of class E inverter can be adjusted by regulating the duty ratio of...
The interleaved multiphase modularization is an interesting approach for DC-DC converters in order to provide high power density, low current ripple and high efficiency. This paper explores a modularization based on a master-slave technique for improving the efficiency of a multiphase interleaved synchronous boost converter. The proposed technique is compared with the classic interleaved solution...
Against conventional wisdom, asymmetrical interleaving strategy is proposed for two-phase interleaved LLC resonant DC/DC running at the same switching frequency to guarantee the equilibrium point of current sharing under all operation condition. Basing this strategy, adaptive-voltage-positioning (AVP) concept is further proposed for passive current sharing realization, while satisfying output voltage...
This paper introduces a novel bridgeless resonant ac-to-dc converter, capable of efficiently converting arbitrary low-amplitude input voltages into a regulated dc voltage. High-frequency resonant operation owing to LC resonance allows small footprint for passive components, thereby increasing the circuit power density without suffering from switching losses. A resonant gate drive circuit is designed...
This paper describes a capacitively coupled power transfer (CCPT) circuit for higher power application. The circuit has a static transmitter powered from the utility and a movable receiver. Two plates between the transmitter and receiver form a capacitive power transfer surface. A ceramic based dielectric between the parallel plates is realized using low-cost surface-mount ceramic capacitors. Unity...
The intend of this paper is to present a new tool for simulations of power resonant converters. The load of converters represents an oscillating resonant circuits and the major problem consist in obtaining the maximum power at resonant switching frequency, imposed by load. In order to simulate and implementing the resonant converters, we develop a Matlab tool based of the differential equations that...
This paper discusses the operating characteristics of push-pull type series resonant converter. The AC equivalent model and AC analysis of push-pull type series resonant converter are confirmed by analytically and experimentally. Moreover, the operating characteristics of push-pull type series resonant converter including SR are also investigated.
This paper presents the steady-state analysis of series resonant converter (SRC) using the extended describing function (EDF) method. The EDF method is used to express non-linear terms of switching waveforms as linear descriptors to develop a linear model of the converter. The converter under consideration consists of a half-bridge inverter and a full-wave rectifier. The steady-state analysis in the...
The conventional pulse frequency modulated (PFM) zero current switching (ZCS) series resonant (SR) inverter fed dc high voltage power supplies have nearly zero switching loss. However, they have limitations like narrow variation of output voltage and poor control at light load. To alleviate these limitations, this paper proposes a multi-output ZCS-SR inverter fed high voltage dc-dc converter. The...
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