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In this paper, a LLC resonant DC-DC converter with voltage multiplier (VM) rectifier is proposed. The proposed converter circuit consists of four main components, which are the full bridge inverter, a resonant tank (LLC), a high voltage transformer, and a high voltage VM circuit. The proposed circuit regulates the output voltages by narrowly varying the switching frequency. The LLC resonant circuit...
In this paper, the effect of phase shift modulation on the LLC resonant converter for an interleaved LLC resonant converter with phase shift modulation is investigated. The LLC resonant converters can achieve zero voltage switching (ZVS) of the primary switches and the zero current switching of secondary switches. Due to the sinusoidal shapes and discontinuous conduction of secondary current, the...
To design a LLC resonant converter optimally in the wide input voltage, the LLC resonant converter with a high voltage gain using an auxiliary LC resonant circuit is proposed. The auxiliary LC resonant circuit operates as a variable inductor, and it is represented as an effective magnetizing inductance combined with the magnetizing inductance. In the nominal state, the auxiliary LC circuit provides...
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...
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...
Focused on the rational utilization of large-scale electric vehicle energy storage medium, the bidirectional and efficient power converter technique is important for the vehicle-to-grid (V2G) system. This paper explores the structure design ways of reducing electrical stress of LLC resonant circuit components, presents a novel power converter topology with two-stage architecture and its control strategy...
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....
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...
To cope with the high power density and low cost in switching power supply, LLC resonant converters with the two resonant tank circuits composed of resonance capacitors and two transformers are proposed in this paper. Each transformers used for the proposed resonant circuits are parallel connected in the primary and series connected in the secondary to reduce the current unbalance. The proposed LLC...
A novel single-stage AC/DC converter is proposed here, which is integrated by an interleaving cell and LLC cell. Because the components of system are reduced by integrating, the cost decreases. And since interleaving technology is adopted, the converter can work in high voltage input state. And LLC resonant converter chosen here makes sure that the switches in the primary side can work in zero-voltage-switching...
All kinds of basic topologies dedicating to the type-4 LLC series resonant converter have been explored and researched. These topologies, which varying from the input and output structures with different isolation requirements, have their own potential useful properties while maintaining the same characteristics and possessing all merits of the original type-4 LLC converter. Consequently, each of...
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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