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The paper presents novel transformer-flux-balancing control methods for the isolated bidirectional full-bridge (FB) converter with active clamp and the bidirectional dual-active bridge (DAB) converter. Both approaches are based on the sensing and control of the transformer magnetizing current. For the isolated bidirectional FB converter the magnetizing current is obtained by sensing a single current,...
Considering stability, the loadability of long line ac transmission system is typically far below its thermal limitation. To partially address this problem, a hybrid ac/dc approach is investigated in this paper by superposing dc current on ac currents along existing ac lines, and no changes of insulators, towers and conductors are required. First, detailed performance comparison between line commutated...
The use of permanent magnets for bias magnetization is a known technique to increase the energy storage capability in DC inductors, resulting in a size reduction or increased current rating. This paper presents a brief introduction on the different permanent magnet inductor's configurations found in scientific literature. A new biasing configuration: The Saturation-Gap, will also be presented, simulated...
In the LLC resonant converter, the air gap is generally positioned in the core of the transformer for proper magnetizing inductance. Traditional transformer design methods assume infinite permeability of the core and no energy stored in the core. The improved design methodology for the gapped transformer is proposed with the optimum relative permeability and gap selection to meet the temperature rise...
Lateral misalignment between the transmitter (Tx) and receiver (Rx) in a wireless power transfer (WPT) system significantly reduces its power transmission efficiency. This paper first investigates the lateral misalignment in the magnetic resonance coupled (MRC) WPT system and identifies the High Efficiency Range (HER). The HER is a high efficiency area on the transmission efficiency versus Rx lateral...
This paper investigates magnetic couplers which could potentially be installed within or around a kickstand of an electric bicycle to provide wireless charging capability to the bicycle. The bicycle kickstands considered were the side stand and bracket stand. A cylindrical solenoidal pickup and a solenoidal bar pickup are proposed to be housed in the side stand and bracket stand respectively. Two...
Recently, magnetic gearboxes (MGBs) are attracting more followers as they offer great benefits over conventional mechanical gearboxes including contactless operation, lower noise, lower vibration, and they are maintenance-free. Improving MGBs performance is one of the popular topics under research. Axial MGB is one of the magnetic gear topologies that is suitable for applications which require a physical...
In this paper, Implementation of an integrated 2–in–1 transformer applicable to power supply units (PSUs) for a 120W LED TV is presented. The transformer is comprised a PFC inductor and an LLC resonant transformer, each of which is placed and integrated on an E-I-E type magnetic core. Integrated transformers with two different air gap topologies (i.e., the side gap and center gap topologies) are considered...
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