In wireless charging systems, the H-bridge converter's switching frequency is set close to system's natural resonance for achieving optimized zero voltage (ZVS). Variations are commonly tracked by following changes in resonant current's polarity, i.e., current zero-crossings. The main implementation challenge accounting time delay between real monitored and final resulting switches’ commutation...

This paper proposes a galvanically isolated dc-dc converter that can regulate the input voltage in wide range. It is based on series resonance (SRC) topology and novel boost rectifier. The proposed has smaller number of semiconductors than its SRC-based existing topologies employing an ac-switch comprises only two diodes one switch at output side, while solutions use switches to step up voltage...

This paper presents a variable frequency multiplier technique (VFX) that enables design of converters for wide input and/or output voltage ranges while preserving high efficiency. The technique is applied to an LLC converter to demonstrate the effectiveness of this technique for converters having wide input voltage variation such as universal input power supplies. This technique compresses the ...

This paper proposes a new soft-switched continuous conduction-mode (CCM) boost converter. its suitable for high-power applications such as hybrid electric vehicles, and fuel cell power conversion systems. The proposed converter achieves zero-voltage-switched (ZVS) turn-on of active switches in CCM and zero-current-switched turn-off of diodes leading to negligible reverserecovery loss. The compo...

LED luminaires need a driver circuit for working properly. Most of the drivers have disadvantages such as losses during operation. This issue becomes more important while supplying with limited sources renewables. To overcome problem, this study proposes novel energy efficient based on zero voltage switching (ZVS) single-ended primary inductance converter (SEPIC) technology. Driver and hence we...

A DC-DC converter that can be applied for battery chargers with the power-capacity of over 7-kW for electric vehicles (EVs) is presented in this paper. Due to a new architecture, the proposed converter achieves a reduction of conduction losses at the primary side by as much as 50% and has many benefits such as much smaller circulating current, less duty-cycle loss, and lower secondary-voltage s...

Inductive power transfer (IPT) systems have become increasingly popular in recharging electric vehicle (EV) batteries. This paper presents an investigation of a series parallel/series (SP/S) resonant compensation network based IPT system for EVs with further optimized circular pads (CPs). After the further optimization, the magnetic coupling coefficient and power transfer capacity of the CPs ar...

A self core reset and zero voltage switching (ZVS) forward converter topology is presented in this paper. By employing a simple auxiliary circuit, the proposed topology is able to achieve self reset of the power transformer without the use of the conventional tertiary reset winding, and its main switch can be turned on and turned off under ZVS independent of line and load conditions. This simpl...

Class E synchronous rectifier regulating the output voltage at a fixed switching frequency is presented, analyzed and experimentally verified. This rectifier is derived from a class E low dv/dt rectifier by replacing a rectifier diode with a controlled switch. The rectifier is driven by a sinusoidal current source, and the output voltage is regulated by vary the conduction time of the controlle...

A general procedure for maintaining soft switching in inductor-less half-bridge piezoelectric transformer (PT) inverter was analyzed by applying the equivalent circuit of the PT device. Soft switching capability of the PT was delineated and detailed guidelines are given for the load and frequency boundaries, voltage transfer function and the output voltage that will keep the operation under ZVS...