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It is with great pleasure to welcome you to the 30th annual IEEE Applied Power Electronics Conference and Exposition (APEC2015) at Charlotte Convention Center in beautiful Charlotte, North Carolina.
This paper proposes a simple asymmetric half-bridge converter structure, which operates without any DC offset of the transformer magnetizing current. The proposed topology has a modified rectification stage comprising of only one diode and hence offers the advantages of reduced device count and improved efficiency. Detailed theoretical analysis of circuit operation is presented followed by simulation...
Digital isolators are widely used in isolated power converters for transmitting high-frequency gating pulses. Conventional opto-isolators suffer from low reliability and poor delay matching, while emerging RF based isolators are either expensive or power-hungry. In this work, a Phase-Locked-Loop (PLL) based synchronization scheme is demonstrated to operate a bi-directional Dual-Active-Bridge (DAB)...
This paper presents a dual edge tracking predictive control method for synchronous rectifier (SR) of LLC resonant converter that anticipates the SR current zero crossing instant with respect to two different time references. The proposed method guarantees stable operation of SR of LLC resonant converter during any transient. The operation and performance of the proposed method is verified on 252W...
A single passive and robust auxiliary circuit is proposed to maintain ZVS operation of both switch legs in full bridge converters. For the same auxiliary peak current value, a minimum of 20 percent less rms current is achieved compared with single-inductor auxiliary circuit in steady-state operation. This results in the same ZVS functionality with reduced conduction losses. Experimental results are...
A new Isolated Hybrid Boosting Converter (IHBC) is proposed in this paper. It employs fly-back structure at primary side of transformer and a Bipolar Voltage Multiplier (BVM) structure at secondary side to increase the voltage gain. The circuit alternates between forward and fly-back modes, which avoids the use of magnetic reset winding. The proposed converter has symmetrical configuration with interleaving...
A soft-switching DC-DC converter with secondary-side phase-shift control strategy is proposed for applications requiring wide voltage range and isolated step-down power conversion such as battery charger. Two transformers and a three-leg hybrid rectifier (one MOSFET-leg and two diode-legs) are employed. The primary windings of the two transformers are in-series and the secondary windings are in parallel...
In this paper, a novel flux-balancing method for the isolated dual-active-bridge (DAB) bidirectional converter based on direct control of the magnetizing current is proposed. In the proposed method, the dc component of the primary and secondary current is controlled by providing two control loops; one to keep the average magnetizing current approximately zero and the other to keep the average primary...
This paper evaluates two different implementations of a bidirectional flyback converter for driving a capacitive electro active actuator, which must be charged and discharged from 0 V to 2.5 kV DC and vice versa, supplied from a 24 V battery. In one implementation, a high voltage MOSFET (4 kV) in series with a high voltage blocking diode is added, in parallel with a high voltage freewheeling diode...
This paper proposes a modified control scheme for bidirectional and unidirectional dc-dc parallel ac-link universal power converters, and studies their performance under both variable and fixed switching frequency. Moreover, this paper proposes two novel unidirectional dc-dc topologies to reduce the number of active switches while keeping the advantages of original configuration; i.e. high frequency...
Due to the increasing electricity demand of data centers driven by the emergence of cloud computing and big data, the focus on the development of telecom and data center power supplies is shifted towards high efficiencies. In this paper, a multi-cell converter approach for a telecom rectifier module breaking through the efficiency and power density barriers of traditional single-cell converter systems...
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