## 1 Introduction
Additionally, the foregoing control methods is not only complicated, but also should maintain real-time communication between the primary and secondary sides. In addition to the aforementioned complex control strategies that can provide a CC or CV output, researchers have considered using a switching hybrid topology to achieve a CC/CV output under dynamic loads without the need for complex control strategies [14]. There are four main types of compensation topologies studied, which have certain required characteristics at a specified resonant frequency [15]. For example, under the precondition of satisfying the ZPA, series-series (S-S) and parallel-parallel (P-P) compensation topologies can achieve a CC output under dynamic loads, while series  
Figure 1: Typical charging profile of the battery. parallel (S-P) and parallel-series (P-S) topologies can achieve a CV output [7; 16]. However, research on charging the battery in two modes simultaneously is lacking. Additionally, [PERSON] et al. [17] realized a charger with CC/CV output by using the combination between S-S and S-P topologies with different compensation parameters; however, the circuit was complex and contained a center loose circuit of taps. S-P compensation topologies were comprehensively analyzed by [PERSON] et al. [18], and two types of load-independent output currents and voltages were realized by switching between S-S and P-S topologies. However, the hybrid topology requires not only three switches and an additional inductor, but also a wireless real-time communication link. The CC or CV output of low-order WPT systems under dynamic loads are limited by the loosely coupled transformer (LCT) parameters, which reduces the system design freedom. In many WPT applications, the size or position of the LCT is limited within a certain range, and the available LCT parameters do not meet the requirements of the CC/CV charging mode. To obtain more freedom of the WPT system design, many high-order compensation topologies with multiple compensation components are proposed [19; 20; 21; 22; 23; 24]. For instance, the double side-LCC (DS-LCC) compensation topology with a compensated inductor and two compensated capacitors on each side of the LCT [20; 21; 22] is used to achieve a CC output under dynamic loads. The LCC-S compensation topology has the advantage that there is no ZPA frequency fluctuation according to the load, and the current flowing to the transmitting coil can be constantly supplied regardless of the dynamic loads and coupling-coefficient fluctuations [25; 26; 27; 28]. Additionally, both DS-LCC and LCC-S topologies can meet the requirements of low reactive power and soft switching at the same time, and the greater freedom of system design undoubtedly promotes the design of WPT converters. However, there are few ideas for implementing CC/CV charging by using a hybrid high-order compensation topology with near-communication on the secondary side. On the basis of the foregoing studies, this paper proposes a secondary side near-communication switching hybrid compensation topology method for the battery charging. Two AC switches (ACSs) and one auxiliary capacitor are employed on the secondary side to realize CC/CV charging mode under dynamic loads. The advantages of the proposed WPT charging systems are as follows: (1) There is no need for real-time communication between the primary and secondary sides, which eliminates wireless communication equipment, reduces the cost, and improves the reliability of charging. (2) The proposed WPT charging systems can achieve a lower VA ratio under condition of ZVS at a fixed working frequency of 85 kHz, which effectively enhanced the system effectiveness. A 1.1-kW prototype is used to verify the proposed WPT systems. The experimental results showed that the maximum system efficiency of CC and CV charging stages were approximately 90.9% and 91%, respectively. The structure of this paper is organized as follows: A systematic theoretical analysis of the DS-LCC and LCC-S topologies is described in Section 2.