Nanocrystalline magnetic cores have been applied in inductive power transfer (IPT) systems as novel materials for their high saturation capability and flexible application. However, the loss of eddy current is still a primary concern nanocrystalline material. This letter investigates two crushing patterns, namely square-crushing dot-crushing, flake ribbon (NFR) to mitigate IPT applications. In experiment, 1 kW prototype with curved coupler autonomous underwater vehicles (AUVs) built verify...

The wireless power transfer (WPT) technology has attracted more attention due to its convenience, electrocution free, and safety. However, the current discontinuity characteristics of WPT systems are not sufficiently appreciated. In this article, a unified full-load discrete-time (UFDT) model for system is established, which both suitable continuous conduction mode (CCM) discontinuous (DCM). state-space equation in each state interval derived according equivalent circuits, then UFDT one...

This letter proposes a novel approach for estimating coupling coefficients in inductive power transfer systems based on damped frequencies. In incorporating voltage load, disturbances can lead to current/power oscillations at frequency due poorly damping characteristics. By analyzing the of oscillating components dc-side currents, coefficient be accurately determined without need wireless communication, additional hardware, and complex calculations. Experimental results demonstrate...

This paper proposes an AC-AC converter for the wireless power transfer (WPT) system. Besides, method can also be applied in high-frequency heating applications. Compared with traditional AC-DC-AC system, it doesn’t need a DC bus capacitor. Unlike matrix converter, just needs 7 MOSFETs/IGBTs. The operation modes divided into energy injection and free oscillation. Zero current switchings achieved, which allows system to operate at high frequencies. Furthermore, modulation is proposed achieve...

Wireless power transfer (WPT) technology has been paid more attention due to its safety and convenience. The control strategy is one of the core concerns for electronics. This paper proposed a secondary periodic energy (SPEC) method, which can be used WPT systems other topologies in flowing into load each switching period regulated by controlling DC/DC converter before load. SPEC inherits advantages primary response speed, overshoot suppression, mutual inductance variation. Moreover, it...

For inductive power transfer (IPT) systems, inevitable coupling variations caused by misalignment will decrease the efficiency and result in unstable output power. Many methods have been applied to improve tolerance, but few focus on frequency-detuned operating situations. This paper proposes a new approach based combination of slightly detuned LCC-S S-S compensation topologies achieve relatively constant over wide range. Two perform better anti-offset than resonant ones. The can be limited...

Inductive power transfer (IPT) technology has attracted more attention due to its convenience and safety. The mathematical model is an effective tool for analyzing optimizing the performance of IPT systems. Many previous articles on modeling equate load a pure resistor, which can simplify process. However, this assumption not reliable battery load. In paper, discrete-time derived system with constant voltage Four switching modes are defined in each cycle according states inverter rectifier,...

This paper proposes a coupling estimation method for wireless power transfer (WPT) systems with constant voltage load (CVL). The involves calculating the zero-phase angle (ZPA) frequencies, which are found to be solely dependent on and independent of output in WPT CVL frequency bifurcation. By leveraging this unique characteristic, self-oscillation is employed automatically locate ZPA points, enabling rapid accurate estimation. proposed highly effective across entire range couplings does not...

A novel periodic energy control (PEC) strategy for dc–dc converters is proposed in this letter, where the port nearest to load selected as target, considering loss of switching and passive components. simplified calculation method derived replace integration methods terms possible error during successive integral calculations, meanwhile reducing computational burden. Furthermore, PEC extended other nonisolated converters. Finally, high accuracy proven simulations, a 100-kHz synchronous buck...

Wireless power transfer (WPT) is one of the global highlight techniques with rapid development electric vehicles (EV). Currently, inductive (IPT) for EV charging faces efficiency problem caused by low saturation flux in ferrite core bars. The nanocrystalline ribbon an advisable choice features a high and loss. In this paper, double-D pads coupler enhanced TDK PC40 will be detailed analyzed compared regarding magnetic field density, air leakage around vehicle body, loss distribution,...

In this article, we propose a direct three-phase single-stage ac–ac system based on pulse density modulation (PDM) for the series resonant load. Compared with traditional multistage ac–dc–ac system, bus capacitors among dc stage can be eliminated and good grid-side current quality is achieved. Unlike pulsewidth modulation, PDM has fewer switching times devices, which reduce power loss. high-quality achieved without applying any additional factor correction device. Furthermore, detailed...