An optimized method of harvesting vibrational energy with a piezoelectric element using step-down DC-DC converter is presented. In this configuration, the regulates power flow from to desired electronic load. Analysis in discontinuous current conduction mode results an expression for duty cycle-power relationship. Using parameters mechanical system, element, and converter; "optimal" cycle can be determined where harvested maximized level excitation. It shown that, as magnitude excitation...

A double-sided LCLC-compensated capacitive power transfer (CPT) system is proposed for the electric vehicle charging application. Two pairs of metal plates are utilized to form two coupling capacitors wirelessly. The structure can dramatically reduce voltage stress on and maintain unity factor at both input output. 2.4-kW CPT designed with four 610-mm × copper an air gap distance 150 mm. experimental prototype reaches a dc-dc efficiency 90.8% output power. At 300-mm misalignment case, drops...

This paper proposes a four-plate compact capacitive coupler and its circuit model for large air-gap distance power transfer (CPT). The four plates are arranged vertically, instead of horizontally, to save space in the electric vehicle charging application. two that on same side placed close each other maintain coupling capacitance, they different sizes between primary secondary sides. is presented, considering all six capacitors. LCL compensation topology used resonate with provide high...

This paper proposes a continuous dynamic wireless power transfer system for electric vehicles that reduces pulsations during the charging process. Multiple rectangular unipolar coils are used at primary side as transmitters, and another coil works receiver secondary side. The transmitters placed closely together to reduce variation of magnetic fields along moving track receiver. structure induces self-coupling between adjacent transmitters. An LCC-compensated circuit topology is utilized,...

This paper proposes a double-sided LC-compensation circuit for loosely coupled, long-distance capacitive power transfer (CPT) system. A CPT system usually contains two pairs of metal plates as the coupler. An resonates with coupler to generate high voltages, and corresponding electric fields, power. When compensation is used on both primary secondary sides, it results in LC-compensated The working principle frequency properties are analyzed. show similarity series-series-compensated...

This paper proposes a combined inductive and capacitive wireless power transfer (WPT) system with LC -compensated topology for electric vehicle charging application. The circuit is combination of the LCC-compensated (IPT) LCLC-compensated (CPT) system. working principle analyzed in detail, providing relationship between parameters power. design coupling implemented by finite-element analysis. equivalent model plates derived. A 3.0-kW WPT designed as an example coupling. coupler size 300 mm ×...

In this study, we investigated the capability of harvesting electrical energy from mechanical vibrations in a dynamic environment through “cymbal” piezoelectric transducer. Targeted lie range 50–150 Hz with force amplitude order 1 kN (automobile engine vibration level). It was found that under such severe stress conditions metal–ceramic composite transducer is promising structure. The metal cap enhances endurance ceramic to sustain high loads along amplification. preliminary experiments were...

This paper proposes a six-plate capacitive coupler for large air-gap power transfer to reduce electric field emissions the surrounding environment. Compared conventional four-plate horizontal structure, contains two additional plates above and below inner provide shielding effect. Since there is coupling between every plates, results in circuit model consisting of 15 capacitors. complex first simplified an equivalent three-port model, then two-port which used analysis parameter design. can...

Shipboard electric propulsion systems experience large power and torque fluctuations on their drive shaft due to propeller rotational motion waves. This paper explores new solutions address these by integrating a hybrid energy storage system (HESS) exploring management (EM) strategies. The HESS combines battery packs with ultracapacitor banks. Two strategies for real-time EM of are considered: one splits the demand such that high- low-frequency compensated ultracapacitors batteries,...

This paper proposes a dual-coupled LCC-compensated inductive power transfer system with compact magnetic coupler to improve misalignment performance. In the coupler, main coils form first coupling, and compensation inductors are integrated second coupling. design presented in this paper, unipolar Double D structure. The fundamental harmonics approximation method is used analyze circuit, couplings between considered determine net flow. cases, it shown that coupling inductors, cross coils,...

This paper proposes a CLLC-compensated capacitive power transfer system for electric vehicle charging applications. Four metal plates are utilized to form two capacitors through an air-gap distance of 150 mm. The CLLC compensation circuit topology is used on both the primary and secondary sides resonate with transmitting capacitors. resonance provides high voltage increase level. A comparison previously proposed LCLC also presented, which shows that inductance can be reduced. model coupling...