A Double-Sided LCC Compensation Network and Its Tuning Method for Wireless Power Transfer

Abstract

This paper proposes a double-sided LCC compensation network and its tuning method for wireless power transfer (WPT). With the proposed topology and its tuning method, the resonant frequency is irrelevant with the coupling coefficient between the two coils and is also independent of the load condition, which means that the system can work at a constant switching frequency. Analysis in frequency domain is given to show the characteristics of the proposed method. We also propose a method to tune the network to realize zero voltage switching (ZVS) for the Primary-side switches. Simulation and experimental results verified analysis and validity of the proposed compensation network and the tuning method. A wireless charging system with output power of up to 7.7 kW for electric vehicles was built, and 96% efficiency from dc power source to battery load is achieved.

Design of LCC Impedance Matching Circuit for Wireless Power Transfer System Under Rectifier Load

“…Taking the above analysis into consideration, the LCC impedance matching method is introduced to meet the optimum load R opt for secondary coil for maximum efficiency in WPT system under rectifier load, as Fig. 5 shows, C S , C 21 and L 21 forms LCC impedance matching circuit. For conventional LCC impedance matching method, the rectifier load is seen as a resistance load.…”

“…The equivalent impedance Z 21 in Fig. 5 is analyzed to match R opt via adjusting C S , C 21 and L 21 .…”

“…As mentioned in literature [21], a double-sided LCC compensation network and its tuning method was proposed for wireless EV charging system, which ensured the resonant frequency is irrelevant with the coupling coefficient between the two coils and is also independent of the load condition. But it doesn't take the nonlinear rectifier load into consideration.…”

Insights into Dynamic Tuning of Magnetic-Resonant Wireless Power Transfer Receivers Based on Switch-Mode Gyrators

“…Therefore, a saturable-core magnetic amplifier has been proposed for tuning LCL-compensated receivers which is considered as a bulky solution suitable for high power applications [40]. Similarly, a double-sided LCC compensation has been proposed in [41] to achieve a unity power factor at the transmitter and the receiver. The presented compensation technique has been proposed to offer k-independent and load-independent constant resonance frequency while achieving a zero-voltage-switching at the transmitter driver.…”

Research and Design of Wireless Charging System of Electric Vehicles

“…Today's wireless charging technology was originated from the magnetic resonance theory proposed by MIT in 2007 [10] . The team of Professor, Mi Chunting in the University of Michigan researched a new compensation network and proposed LCC compensation topology for the wireless charging application of electric vehicles [11] . Korea Advanced Technology Institute developed a set of dynamic wireless charging technology called On-Line Electric vehicles [12] .…”