The self-oscillating flyback converter is a popular circuit for cost-sensitive applications due to its simplicity and low component count. This paper presents self-oscillating fly-back converter for mobile batteries charging applications. The converter is designed to step-down the high voltage input to an acceptable level from 220 VAC to 7VDC. By adding indictor and capacitor the power factor a...

An improved single-ended push–pull (SEPP) halfbridge type zero-voltage soft-switching pulse width modulation (ZVS-PWM) DC–DC power converter is presented in this paper, which makes use of a saturable reactor-assisted lossless capacitor type zero voltage soft-switching method. The SEPP power converter with a high-frequency forward and flyback hybrid transformer link has some advantages such as l...

High power and high voltage gain DC-DC converters are key to high-voltage DC (HVDC) power transmission for offshore wind power. This paper presents an isolated ultra-high step-up DC-DC converter in matrix transformer configuration. A flyback-forward converter is adopted as the power cell and the secondary side matrix connection is introduced to increase the power level and to improve fault tole...

The design and analysis of a compact flyback AC to DC power supply is described and simulation results are presented. Of particular interest is merging two interleaved power converters such that the main switch in one converter behaves as the clamp switch of the other while ripple cancellation is accomplished. Also, PFC and ZVZCS are achieved with no extra components. Using these approaches, th...

The most popular DC-DC converter topologies are also the simplest the flyback converter and the forward converter. Much of their simplicity is because they employ a single power transistor referenced to the primary-side return. Though these topologies are straightforward, they do have some significant drawbacks in many applications. In these situations, designers turn to more elegant topologies...

IEC 1000-3-2 regulations impose a reduced harmonic content on any converter with an input power higher than 75 W. However, if the power architecture of the system is based on small on-board converters, and the total power is higher than 75 W, IEC regulations must be fulfilled although each individual converter need not comply with the regulations. In this paper, one of the different possible so...

1 This work is supported by Philips Research, Briarcliff Manor, NY, through Colorado Power Electronics Center Abstract – In converters for power-factor-correction (PFC), universal-input capability (ability to operate from any AC line voltage, world-wide) comes with a heavy price in terms of component stresses and losses, size of components, and restrictions on the output DC voltage. A new two-s...

A bidirectional isolated full-bridge dc–dc converter with a conversion ratio around nine times, soft startup, and soft-switching features for battery charging/discharging is proposed in this paper. The converter is equipped with an active flyback and two passive capacitor diode snubbers, which can reduce voltage and current spikes and reduce voltage and current stresses, while it can achieve ne...