Power Flow Control of a Power Conversion Circuit for Contactless Power Transformer Systems with Coil Misalignment

Abstract

The coupling coefficient between the coils of a noncontact power supply system is reduced by coil misalignment. This reduces the output voltage and the active power in the coils. To cope with these problems, an instantaneous current control method is applied to a single-phase contactless power transformer system in order to apply the equivalent impedance of the PWM rectifier at the load side of the transformer. We propose a control method to supply power constantly to the load even when there is a misalignment in the receiving coils. The limit of the transferred power associated with the proposed control method is investigated. The proposed system, including the control method, is verified by experimental tests over a power range of several tens of watts. C⃝ 2015 Wiley Periodicals, Inc. Electr Eng Jpn, 193(1): 55-64, 2015; Published online in Wiley Online Library (wileyonlinelibrary.com).

Research on the Characteristic Change in an Inductive‐Coupling‐Type Contactless Power Transformer for a Railway According to the Core Shapes and Misalignment Utilizing a T‐Type Equivalent Circuit

“…We used experimental results obtained by a system proposed by Kitazawa and colleagues [6] with whom we are collaborating in joint Fig. For this purpose, we compared the experimental and analytic results obtained upon misalignment in order to verify the electromagnetic field analysis.…”

“…For this purpose, we compared the experimental and analytic results obtained upon misalignment in order to verify the electromagnetic field analysis. We used experimental results obtained by a system proposed by Kitazawa and colleagues [6] with whom we are collaborating in joint Fig. 2.…”

“…Here, we calculate transmission efficiency for the circuit where both primary and secondary compensating capacitors are connected in series as shown in Fig. 1, with reference to the previous research [6]. The primary series capacitor (C C ) and secondary series capacitor (C S ) are used to obtain input power factor of 1.…”

“…Mc Donough and colleagues [5] compared systems with circular and square coils but those are coreless designs. As regards the previous research related to the current project, there is a study by Kitazawa and colleagues [6]. That study focuses on misalignment of circular cores, but its aim is to achieve a constant power transmission by means of circuit control with existing cores.…”