Efficiency optimization for LCC‐LC compensated inductive coupling power transfer system with load‐independent zero‐phase‐angle and constant voltage output

Abstract

SummaryHigh‐order compensation for the inductive coupling power transfer (ICPT) system is preferred due to its high design freedom and excellent coil current harmonics suppression capability. Especially, the good harmonics suppression capability is helpful to implement the synchronous wireless transfer of energy and data with a pair of data communication coils integrated into the energy transfer coils. Thus, on basis of THD1 and THD2 comparison for different high‐order compensation topologies, the LCC‐LC compensated ICPT system with load‐independent zero phase angle (ZPA) and constant voltage output is discussed in this paper. Compared with other high‐order compensation topologies with constant voltage output such as LC‐LC, LC‐LCC, and LCC‐LCC, the LCC‐LC has the advantages of ZPA operation with zero voltage switching and less secondary‐side components. For a given magnetic coupler, infinite feasible combinations of compensation parameters can make the system accomplish ZPA and the same output characteristics. Thus, efficiency optimization of the LCC‐LC compensated ICPT system can be investigated by configuring the optimal compensation parameters. To validate the theoretical analysis, especially the efficiency improvement, the experimental platform with 270 V input and 270 V/3 kW output is designed and built. The comparative experimental results for three different the compensation parameters show the optimized system can improve greatly conversion efficiency over the entire load range, especially under light load.

Investigation of 1.5 kW secondary side power controlled method in a inductive wireless power transfer system

“…To improve the maximum power transferred to the coil compensation is needed for both sides such as S-S, S-P, P-P, and P-S [22]- [24]. While using the compensation both sides reactive powers observed components are neutralized and transferred only to the active power also the transmitter and receiver voltage and current are in phase as zero power angle (ZPA) [25]. From that series-series compensation is simple and less complex to design [26]- [29].…”

Misalignment tolerance improvement and high efficiency design for wireless power transfer system based on DDQ‐DD coil

“…Currently, the analysis methods for WPT systems are categorized into two groups based on whether or not they consider high‐order harmonics 29,30 . Since the compensation networks filter out almost all high‐frequency components, the fundamental harmonic approximation is adopted in this paper.…”

A receiver-side power control method for series-series magnetic topology in inductive contactless electric vehicles battery charger application

“…P-P and P-S are current-fed compensators. Therefore to achieve the zero input reactive power, the input impedance will be almost resistive which results in zero phase angle (ZPA) [15] between input current and voltage. So power transfer capability (PTC) and efficiency of the WPT system will increase.…”

“…The S/S compensated wireless charger is a constant current source and can be controlled by the supply voltage in general [27]- [31]. The Pout and Pin real power can be obtained as (15) [32].…”