A Monotonic Output Regulation Method for Series-Series Compensated Inductive Power Transfer Systems with Improved Efficiency and Communication-Less Control

An Active-Rectification Based Communication Free Inductive Power Transfer for Battery Charging System with Soft-Switching Capability

“…The soft-switching can help to reduce the switching loss and EMI noise significantly and generally can be achieved by a reversed current at the switching node for a half-bridge configuration [10]. Conventionally in an IPT system with S-S compensation, a switching frequency modulation is adopted to keep the input impedance of the inverter as inductive for the soft-switching achievement [11].…”

“…Nevertheless, in the complex industrial environment with much conductive and radiation EMI noisy, the high-speed wireless communication may be interfered, which leading to severe safety issues from unstable operation during the charging period. In [9], [10], two different output regulation strategies for IPT systems are proposed without wireless communication but need two independent micro-controller at both primary side and secondary side. The requirement of the controllers limits their widespread use due to high system's and complexity of implementation.…”

Modeling, design, and control of inductive power transfer systems

“…Active reactance control approaches have been proposed to maintain (5.3). One possible solution is to change the reactance by rectifier phase shift modulation (PSM) [62,68,69] or phase angle control (PAC) [70] as introduced in Section 2.6.3. For example, [69] used a novel rectifier PSM control to not only achieve (5.3) considering reactance drift, but also achieved (5.4) as well.…”

“…θ refers to the phase angle between uo and io (or the SR signals), which can be controlled by changing the phase difference between S5 and the SR signals that was zero in Figure 2.23. The impact of α, or equivalently β which equals (π−α), and θ can be expressed as [68][69][70][71]:…”

“…Considering the case that α is applied while θ equals zero, Xeq becomes zero and the effect of rectifier PSM is similar to inverter PSM. Moreover, for the case that θ is applied with α = 0 [70], the modulation is equivalent to modifying the impedance angle and is called phase angle control (PAC) in this thesis to differentiate from regular PSM. Since α and θ are independent variables while achieving different effects, rectifier PSM has high control flexibility [68,69].…”