A Primary-Side Control Strategy for Series-Parallel Loosely Coupled Inductive Power Transfer Systems

Inductive power transmission system with stabilized output voltage using local primary-and secondary-side control

“…In that paper variable frequency control is used to operate the system at a zero phase angle (ZPA) frequency at which the phase shift between input current and voltage is zero, eliminating reactive power flow and therefore the VA rating of the power amplifier [14]. It is shown in [13] that three operating modes exist where the output voltage is independent from the output load, if losses are neglected and the primary and secondary resonance frequencies are perfectly matched. This paper proposes primary-side ZPA control in combination with a loss-free clamp circuit on the secondary side to achieve output voltage stabilization.…”

“…We have two compensation capacitors in series to the primary and secondary coils and we use the acronym PSSS (Primary Series Secondary Series) introduced in [15] throughout this text to describe the compensation topology. In section II we will show that in a PSSS compensated IPT-System with ideally matched primary and secondary natural resonance frequencies the voltage gain at the ZPA frequencies is not only independent of the load as in [13], but also…”

“…In [13] a primary-side control strategy for a seriesparallel compensated IPT system has been proposed to achieve output voltage stabilization. In that paper variable frequency control is used to operate the system at a zero phase angle (ZPA) frequency at which the phase shift between input current and voltage is zero, eliminating reactive power flow and therefore the VA rating of the power amplifier [14].…”

Review on Contactless Power Transfer for Electric Vehicle Charging

“…For the case of multiple receiving coils coupled with a single transmitting coil, excitation and frequency are kept constant and power flow control is achieved at the receiving end with the help of a rectifier and DC-DC converter [18]. For stationary charging as there is a single receiving coil, it is better to control from the transmitting side so that DC-DC converter at the receiving side can be eliminated there by losses in the receiving side can be reduced [19]. Transmitting side control techniques are classified as fixed frequency and variable frequency.…”

Directional Tuning Control of Wireless/Contactless Power Pickup for Inductive Power Transfer (IPT) System

“…As IPT systems extend to more fields, better control methods are required to cope with various operating environments to satisfy users' needs. Difficulties in controlling the power flow in a wireless/contactless power pickup using IPT technologies can arise from several factors, which include but not limited to load and circuit parameter variations, magnetic field coupling variations between the primary and secondary coils, the operating frequency drift of the primary power supply, etc (Jackson et al, 2000;Chao et al, 2007). These factors can cause the output voltage of the secondary power pickup to deviate significantly from the original designed value, resulting in an undesirable characteristic for applications where a stable output voltage is required.…”