This paper presents a continuous control set model predictive control (CCS-MPC) method for reducing oscillations in an inductive power transfer (IPT) charging system with constant voltage load (CVL). The proposed power control method inherently reduced the output fluctuations by minimizing the error between the actual power and the reference power, which is expressed as a cost function. Then, by solving this optimization problem, the optimal pulse density can be obtained for pulse density modulation (PDM) techniques in order to adjust the average sending voltage. This optimal pulse density is applied to enhanced/pulse density modulation (E/PDM) based on delta-sigma modulator (DSM) approach. The proposed CCS-MPC based on EPDM regulates power transfer control to ensure high efficiency by maintaining the low current/power ripple, fast dynamic response and achieving zero voltage switching (ZVS) in a full operation range. To verify the performance and effectiveness of the proposed control method, a comparison between the proposed CCS-MPC and PI control methods based on different modulators has been tested in MATLAB/Simulink.

This paper presents a finite-control-set model predictive control (FCS-MPC) strategy for pulse density modulation (PDM) in inductive power transfer (IPT) systems. The main purpose of this method is to suppress current/power ripples while ensuring high efficiency and fast dynamic response. The proposed control method is based on a nonlinear model of the IPT system when charging a battery appearing as a constant voltage load (CVL) and considers all the possible switching states for each period within the control horizon. The switching states are obtained based on optimal decision variables at each sampling time which provide the minimum value of the cost function. This results in the skipping of voltage pulses, which ensures that zero voltage switching (ZVS) occurs over the full range of operation. Moreover, by predicting the future behaviour of the studied system, the proposed control method will inherently suppress oscillations that can be excited by the skipped voltage. As a result, the system's performance is improved with respect to high efficiency and fast dynamic response. The effectiveness and performance of the proposed control method are verified by the simulation results.

The high switching frequency of wireless power transfer systems makes soft switching important due to switching losses. In the current literature, numerous solutions have been proposed for maintaining soft switching within the entire operating range. However, this study shows that variable frequency control can cause loss of zero voltage switching (ZVS) during system transients, even if soft switching during steady-state operation is ensured. The causes of this phenomena are analyzed thoroughly and two approaches to address such issue are discussed. Firstly, a limitation on the changing rate of the frequency can alleviate the issue. Secondly, phase advance control could also be possible, although this approach requires further studies. Results from both simulations and laboratory experiments are presented to verify the analysis and the control method proposed to avoid losing ZVS during transient conditions.

This paper proposes a hysteresis ON-OFF control method for inductive power transfer (IPT) systems with low output ripples and fast transient responses. System power is regulated by skipping pulses, thus achieving zero voltage switching over the full operating range. Moreover, each switching state is determined by a hysteresis comparator operating on the measured power. This prevents the skipped pulses from exciting poorly damped oscillations. The dynamic behavior of IPT systems with the hysteresis ON-OFF control method is excellent because the controlled state of the system is directly adjusted in every half cycle. The effectiveness and feasibility of the proposed method are validated by simulations and experimental results from a small-scale laboratory prototype.

This paper proposes a system and its control method to boost part of the battery voltage for electric vehicle. This system consists of the powertrain of electric vehicles and a bi-directional isolated DC-DC converter called dual active bridge (DAB). The powertrain of electric vehicles in the market has the problem that its performance degrades due to fluctuations in battery voltage. In order to solve this problem, a DC-DC converter is often inserted serially between the battery and the inverter. However, in this solution, the conduction loss of the DC-DC converter always occurs. In this paper, as a solution to the above problems, a voltage boosting system using DAB converter is shown.

This paper proposes driving range extension by series chopper power train for Electric Vehicles (EV for abbreviation). The proposed method was experimentally verified and compared with the previous publication [1]. Further measurement on motor test bench, to compare this drive with the conventional power train, showed a 2.1 % improvement.