This paper proposes two new soft-switching transformerless converters with high voltage conversion ratio. These proposed converters achieve soft-switching each with a single auxiliary resonant cell. The merit of these converters is reduced switching losses with lesser number of devices. The main switching devices are turned off with zero current switching (ZCS). Apart from the soft-switching fe...

We report on an efficient high-power, widely tunable femtosecondopticalparametricoscillator inBiB3O6, synchronously pumped by a frequency-doubled mode-locked Yb: KGW laser at 515 nm. Using collinear type I (o → e e) phase matching, a resonant wavelength range of 688– 1057 nm at a 151-MHz repetition rate is demonstrated, with a tunable idler range of 1150–1900 nm. The output power at 705 nm is 1...

This application note describes the LED driving system using a half-bridge LLC resonant converter for high power LED lighting applications, such as outdoor or street lighting. Due to the existence of the non-isolation DC-DC converter to control the LED current and the light intensity, the conventional PWM DC-DC converter has the problem of low-power conversion efficiency. The half-bridge LLC co...

Abstract: Over the years, it has seen the power conditioning move from simple, but extravagant linear regulators, through early low frequency pulse-width modulated systems, to high-frequency square wave converters, which pack the same power handling capabilities of earlier designs into a fraction of their size and weight. At present, a novel attack is upon us the resonant mode converter and whi...

Stable high-power operation in the deep ultraviolet is achieved from a multi-kHz diode-pumped multi-longitudinalmode Q-switched Nd:YAG laser by fourth harmonic generation in an external resonant cavity and by fifth harmonic generation using sum-frequency mixing of the fourth harmonic and the residual fundamental in a b-BBO crystal. Over 2.1 W of 266 nm radiation and 540 mW of 213 nm radiation w...

This application note describes the LED driving system using a half-bridge LLC resonant converter for high power LED lighting applications, such as outdoor or street lighting. Due to the existence of the non-isolation DC-DC converter to control the LED current and the light intensity, the conventional PWM DC-DC converter has the problem of low-power conversion efficiency. The halfbridge LLC con...

This paper details the development of a generator based upon a cantilever beam inertial mass system which harvests energy from ambient environmental vibrations. The paper compares the predicted results from Finite Element Analysis (FEA) of the mechanical behaviour and magnetic field simulations and experimental results from a generator. Several design changes were implemented to maximise the co...

A new type o f a control led ac t ive reactance based on a h i g h frequency resonant inverter with bidirect ional swi tches i s proposed and examined. I t s important advantages over o ther approaches are: lower energy stored in react ive elements and lower harmonic distort ion.

-The inspiration for the use of the resonant inverter shoots from an aspiration to minimise the switching losses in the inverter devices. This paper portrays an exhaustive study on losses in the resonant DC link inverter. Equations for accessing the diverse losses in the resonant DC link inverter and a corresponding hard switching inverter are developed. Based on these equations, a design optim...