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Wireless charging of electric vehicles (EVs) is going to play a major role in electrification of transportation. This paper proposes to utilize an LCL tuned primary and series tuned secondary with a secondary buck regulator to achieve power transfer control by secondary side control only. Analytical expressions for base (primary) coil current and transformer turns ratio N required to transfer the...
This paper proposes spread spectrum methods to reduce radiation noise caused by an inductive power transfer (IPT) system. A noise reduction method with spread spectrum techniques has been proposed. The proposed noise reduction method randomly changes the output frequency of an inverter within a range of 79-to-90 kHz. Changing the output frequency, the radiation noise is spread in a frequency domain...
This paper proposes a power factor correction method of a non-resonant IPT system using a four-winding transformer. The proposed technique is applied to the IPT system with a dual active bridge converter to reduce conduction loss and winding loss. When two pairs of the primary-side and the secondary-side wires are connected in parallel, the low coupling coefficient between the wires driven by in-phase...
This paper proposes a primary side control for series-series compensated wireless power transfer system. By eliminating the need for a communication link for signal feedback, the control method not only reduces volume and cost of the system, but also improves a dynamic response. This controller only requires the information of the primary side voltage and current to identify the load resistance and...
This paper proposes a new wireless power transfer (WPT) control technique, which employs primary side controller and series-series (SS) or series-parallel (SP) compensation to achieve constant voltage (CV) charging or constant current (CC) charging without the information of the variable load. Through the variation of primary side resonant current, the charging voltage or charging current is estimated...
Wireless power transfer (WPT) technology has been considered as a promising power supply method for modern trams with electric double layer capacitors (EDLC). However, in real case, factors such as parking misalignments, load variations and coils inclination would result in a deviation of coils mutual inductance, which may adversely impact on system transmitting efficiency. Therefore, an approximately...
Aimed at the distortion problem of the inverter output current when LCL/LCC wireless power transfer system is under light load, an additional LC band-pass filter can lower the total harmonic distortion to achieve high-quality power transmission. Meanwhile, the output current can still be kept nearly constant and the system work is in totally resonant state. Simulated results indicate that the distortion...
Induction heating (IH) appliances are widely used for industrial appliances and home electronics because IH has a lot of merits. Recently, wireless power transfer attracts attention as a promising industry. As for wireless power transfer, inductance is changed in accordance with power transmission distance or surrounding environment. Similarly as for IH, inductance and resistance as equivalent circuit...
Dynamic wireless power transfer is a practical method to solve electric vehicle range anxiety and reduce the cost of on-board batteries. However, the power cannot be transferred between different coupler structures. In this paper, DDQ coupler is adopted in primary side for delivering power to any secondary coupler. A novel multiple legs inverter topology and reflected load identification method is...
This paper presents the design and implementation of a high frequency magnetic resonant coupling wireless power transfer (WPT) for middle power charging applications. The size and efficiency of resonator are depending on the resonant coupling frequency in the WPT system with magnetic resonant coupling. To improve the WPT efficiency, power capacity and resonator size, a high resonant coupling frequency...
Integrated charger topologies that have been researched so far are with the dc-dc converters and the charging functionality usually have no isolation in the system. Isolation is an important feature that is required for user interface systems that have grid connections and therefore is a major limitation that needs to be addressed along with the integrated functionality. This study features a unique...
Traditional in-motion (dynamic) wireless power transfer (WPT) is based on elongated power transmitting tracks. It suffers from low efficiency, having complex and not fully utilized magnetic structures, among other drawbacks. In the case of lumped transmitter coils commeasurable in size with the receiver coil, which has been recently proposed for the in-motion WPT, the power transfer is intermittent...
At 13.56MHz, the inverter is strongly affected by parasitic elements. The print circuit board (PCB) design is very critical because it control the parasitic elements on the circuit. This paper analyzes the effect of parasitic elements on switching performance of MOSFETs in 13.56MHz class D inverter. This work also proposes an improved PCB design which can provide a 23.4% decrease in parasitic inductance...
This paper presents a RIC-WPT system with class-E inverter and class-DE rectifier along with its analytical design procedure. By using the class-E inverter as a transmitter and the class-DE rectifier as a receiver, the designed WPT system can achieve a high power-delivery efficiency because of the class-E ZVS/ZDS conditions in both the inverter and the rectifier. In the experimental results, the system...
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