Here we report a compact monolithic 2000nm pulsed laser with a single spatial mode output, ~1.5ns pulse duration, 8kW peak power and >200mW average power at 20 kHz repetition rate. The gain-switched laser, consisting of a pair of fiber Bragg gratings and 0.5m of thulium-doped single cladding fiber, was core pumped by a high peak power pulsed 1.5 m laser. When the input pulse energy of the 20 kH...

OWER CONVERTERS have been widely adopted for distributed power generation systems, where the resonances may be excited. Although many innovative methods have been put forwarded to attenuate the appeared resonances and enhance the stability of system, how to keep high performance of power converters is still a big challenge for researches and engineers, especially when the power grid is weak and...

The design process for a fuel-cell-based inverter system for domestic use is discussed. The peculiar characteristics of the fuel cell stack energy source require the use of a battery for buffering. The fuel cell characteristics and the battery requirements for this application are discussed. A large number of different possible solutions are examined. The proposed solution uses an active filter...

At high frequency, the winding losses of power transformer due to skin and proximity effects becomes a significant component in the loss calculation of the transformer efficiency. This paper examines the winding losses associated with these effects for planar-type low-profile transformers that are suitable for high frequency high density soft switching power supply application. The transformer ...

This paper presents the proposal and implementation of a power management architecture for local area network environments. Our main goal is to contribute to more efficient use of electricity, reducing energy waste by facilitating the configuration of power policies and providing a means to automate their execution. The architecture we propose is based on the SNMP (Simple Network Management Pro...

In this paper, we propose a simultaneous scheduling and allocation algorithm for voltage-partitioned multiple-V design. By considering voltage partition during scheduling and allocation, we may place the resources of same voltage in one partition, thereby reducing additional power meshes. Also, the partitioned design reduces the energy dissipation of level converters by reducing cutsize between...

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In this paper, we propose a simultaneous scheduling and allocation algorithm for voltage-partitioned multiple-V design. By considering voltage partition during scheduling and allocation, we may place the resources of same voltage in one partition, thereby reducing additional power meshes. Also, the partitioned design reduces the energy dissipation of level converters by reducing cutsize between...

When energy prices fluctuate, small scale storage, such as provided by electric vehicles or uninterruptible power supplies, allows users to reduce their overall costs by buying in price troughs. However, if future prices are rising, a user may be inclined to store energy long-term. By analysing the structural properties of the charging schedule for energy storage systems,this paper demonstrates...