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This paper proposes a simple circuit configuration and a control strategy of Solid-State Transformer (SST). In the proposed circuit, it is possible to reduce the volume of heat sinks and passive components by using low voltage switching device with low loss characteristic and high frequency operation. Moreover, the circuit employed with the proposed control strategy operates stably even when the ripple...
This paper proposes a bendable transformer for wearable electronics. This transformer is bendable to wrap around the forearm. A model using partial equivalent circuit theory (PEEC) is established to analyze the characteristic of the bendable transformer. The bendable transformer is then applied to an LLC DCDC converter. A prototype is built and tested to verify the mode. This LLC resonant converter...
In this paper, we designed a LLC resonant converter as the main power supply of the medical Nd:YAG laser. First harmonic approximation (FHA) is used to model the LLC resonant converter. FHA equivalent circuit model and the transfer function of the LLC converter is proposed. Soft start technology is used to suppress the surge current. The laser output is simulated and experimented, the pulse laser...
In this paper, the closed loop control of LLC type of series parallel resonant converter configuration of load resonant converter and its modeling analysis is implemented using fuzzy control. The LLC type resonant converter provides high frequency operation, without any change its high efficiency, whose applications mostly in DC to DC converters. The state space modeling technique is used to determine...
In LLC resonant converter, the integrated transformer with high leakage inductance is preferred to get high power density by eliminating the series resonant inductor. However, high leakage inductance results from stray magnetic field between primary winding and secondary winding, which brings near-field effect and severely impacts on near-by components. In this paper, the mechanism of near-field effect...
An LLC resonant converter has been used to provide the electrical characteristics of solar arrays. In this paper, its small signal model is derived based on the extended describing function concept. The corresponding frequency response can be easily obtained from IsSpice simulation of the equivalent circuit model. Furthermore, a closed-loop compensation controller is designed according to the derived...
Due to the advantages of low switching loss and high efficiency, LLC resonant converters have been widely used. Based on the extended describing function concept, the small-signal model of an LLC resonant converter is derived in this paper. The equivalent circuit of small-signal model is illustrated so that the corresponding frequency response can be easily obtained by using Is Spice simulation. The...
This paper deals with simulation model of the LLC resonant converter with frequency of 300kHz. The results of the simulation analysis are compared with results obtained from measurement on the real physical sample of proposed converter. The simulation model consists of three fundamental parts: rectangle impulses generator, resonant circuit with high-frequency transformer and the output rectifier....
Half bridge magnetizing inductor (LmC) resonant dc/dc converter reduces the high current ripple of the output capacitor in LLC resonant converter maintaining narrow switching frequency and soft switching. This paper presents analysis and design of the half bridge LmC resonant converter. Using the extended describing function (EDF), the steady state analysis is carried out. Based on the results, the...
The paper deals with optimized design of parameters of the main circuit of LLC resonant converter with output power of 1 kW designed for distributed power systems application. The switching frequency should be 500 kHz, therefore the optimization of main circuit in the way of proper transformer design and selection of compromise between conduction losses, switching losses and regulation range with...
The aim of this paper is to present a comprehensive design methodology for the magnetic integration of the series and shunt inductances of the resonant tank in an LLC resonant converter within the transformer. The design procedure applies to symmetrical core-bobbin structures with two separate slots for the primary and secondary windings. A specific leakage inductance Asigma. (per square turn) that...
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