A passive lossless snubber cell is proposed to improve the turn-on and turnoff transients of the MOSFET’s in nonisolated pulsewidth modulated (PWM) dc/dc converters. Switching losses and EMI noise are reduced by restricting di=dt of the reverse-recovery current and dv=dt of the drain–source voltage. The MOSFET operates at zero-voltage-switching (ZVS) turnoff and near zero-current-switching (ZCS...

This paper presents the functions of Series-Loaded Resonant Converter (SLRC). Series Loaded Resonant DC-DC converter is a type of soft-switching topology widely known for providing improved efficiency. Zero voltage switching (ZVS) buck converter is more preferable over hard switched buck converter for low power, high frequency DC-DC conversion applications. Zero Voltage switching techniques wil...

In this paper, a novel zero voltage transition (ZVT) pulse width modulation (PWM) DC-DC interleaved boost converter with an active snubber cell is proposed. All of the semiconductor devices in the converter turn on and off with soft switching to reduce the switching power losses and improve the overall efficiency. Due to interleaved approach, the current stresses of main devices, the ripple of ...

This paper proposes an inductive coupled wireless power transfer (WPT) system with class-E2 dc-dc converter along with its design procedure. The proposed WPT system can achieve high power-conversion efficiency at high frequencies because it satisfies the class-E zero-voltage switching and zero-derivative-voltage switching conditions on both the inverter and the rectifier. By using the class-E i...

The benefits of soft-switching converters, and in particular zero-voltage switching (ZVS, also called zerovoltage-transition [ZVT] or resonant-transition) circuits, are well-known. High-frequency converters powered from high source voltage show significant improvements when operated with soft switching. These improvements are 1) reduced switching losses, which allow high switching frequency and...

A novel zero-voltage-switching (ZVS) phase-shift isolated bidirectional DC-DC converter is proposed. It is composed of two symmetrical active-clamped circuits, one on each side of an isolation transformer. The converter can achieve full ZVS in both forward and backward modes even under noload condition. The converter also has a fast response. The operation principle and low-frequency model of t...

The newly developed phase-shift controlled bidirectional DC-DC converter has the conventional features of phase-shifted converters, including zero-voltage switching (ZVS) and constant switching frequency. However, it has been improved by developing a bi-directional power flow capability and applying synchronous rectification, hence the on-state voltmge drop of the active devices are small.

This paper deals with PID compensator control of Synchronous Rectifier (SR) Buck Converter to improve its conversion efficiency under different load conditions with the help of a Zero Voltage Switching(ZVS)Logic Circuit. Since the freewheeling diode is replaced by a high frequency switch MOSFET in this buck configuration, the SR control technique itself will be sufficient under heavy load condi...

This paper presents a two output class-E isolated dcdc converter that regulates the output voltages at fixed switching frequency. The converter is simulated at operating frequency of 5 MHz. The converter output power is 40 W and the output voltages are 15 V and 5 V. All the switches operate at zero voltage switching (ZVS) conditions for the full load range. The circuit configuration is simple w...

A systematic approach to the analysis and design of a bi-directional Cûk converter for the cell voltage balancing control of a series-connected lithium-ion battery string is presented in this paper. The proposed individual cell equalizers (ICE) are designed to operate at discontinuous-capacitor-voltage mode (DCVM) to achieve the zero-voltage switching (ZVS) for reducing the switching loss of th...