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A bidirectional integrated bus voltage conditioner (IBVC) is proposed for isolated phase shifted full bridge (PSFB) DC-DC converter to improve the DC bus voltage stability in cascaded power converter system. In this method, the load converter is controlled tightly with high control bandwidth. Unlike those separate converter based DC bus voltage stabilization methods with auxiliary switches, multiplexing...
A new ripple current reduction method utilizing a LLC type ripple current steering circuit is proposed in this paper to significantly reduce 100Hz ripple current in an isolated DC-AC dual active bridge (DAB) converter. Unlike some of the proposed ripple reduction methods for which auxiliary circuit consists of additional switches is applied, this new method benefits from less switching components...
This paper proposes a new high-efficiency PV converter for grid connection through a high-leg delta transformer. The converter is composed of a symmetrically-connected boost converter and three half-bridge inverters. One of the three half-bridge inverters is connected to the boost converter, and the others are directly connected to the PV terminals. As a result, this circuit configuration enables...
This paper investigates the effect of neutral point potential oscillation on four pole neutral point clamped converter. The detailed derivation indicates such oscillation is closely associated with neutral point current, so this paper presents a modulation technique to effectively eliminate this neutral point current. Besides, an offset injected method is also taken into consideration, and a comparison...
A non-isolated high step-up DC-DC converter with coupled inductor is developed for large voltage gain applications such as electric mobility and renewable energies. This converter combines the concepts of magnetic integration and interleaving phases that are effective for downsizing of power converters. The developed converter offers a good performance of voltage gain vs. converter size, because,...
This paper proposes a novel Interleaved Series Input Parallel Output Active Clump Forward (ISIPO-ACF) converter with integrated magnetic components that might achieve high power density. This converter is suitable for high input voltage and high output current applications such as dc-dc converters of EVs and HEVs. In this paper, the superiority of that in term of size and losses of the magnetic components...
In this paper, a single-phase quasi-Z-source (qZS) inverter (qZSI), integrating the pulse width modulation (PWM) control with interleaved placement shifted shoot-through state (STS) modulation technique, is developed to simultaneously achieve both dc voltage boost and dc-ac inversion. Instead of placing the shoot-through state in both inverter legs, the proposed method inserts the shoot-through state...
In high power applications, parallel-operated T-type three-level PWM rectifiers have been employed to overcome the power limitation of single rectifier and achieve a flexible operation with improved efficiency. However, zero sequence circulating current (ZSCC) problem emerges when rectifiers are directly parallel-connected in both ac and dc sides. In this paper, the circulating current problem in...
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