Power Electronics News

ELP225 packs mighty power in a small space

XP Power has revealed design features within its latest ac-dc power supply, dubbed ELP225, which can deliver 150W convection-cooled from a 51 x 102mm industrial ‘1U’ footprint package. Only 32.3mm high, this is believed to be a power density record for the 1U open frame format. 225W…

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MTC1 1W DC/DC converters with wide input range from Murata

Murata has launched the MTC1 series of 1W regulated single output DC/DC converters with nominal input voltages of 12 or 24 VDC and accommodate a 2:1 input range around the selected nominal which allows for use in designs with different nominal input voltages or in situations where wide…

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Simple BD768xFJ chip eases SiC into the mainstream

Rohm has introduced a silicon ac-dc controller chip for silicon carbide mosfets. Rather than some multi-kW industrial motor drive, it is a simple 8pin ac-dc controller for 50W single-output designs. “Until now there has not been a control IC that can sufficiently draw out the performance…

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Skeleton launches graphene ultracapacitors

Skeleton Technologies has launched graphene-enhanced ultracapacitors with a capacitance of 4500 farads. Skeleton claims this to be “the single biggest increase in energy density for ultracapacitors in the past 15 years”. Energy density is a key development challenge for the ultracapacitor market and is fundamental if the technology is…

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Research stops lithium batteries overheating

The problem with lithium metal laptop batteries heating up and bursting into flame has been addressed by researchers in the US. The researchers at the Department of Energy’s SLAC National Accelerator Laboratory have discovered that adding two chemicals to the electrolyte of a lithium metal battery prevents the formation…

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Viewpoint: GaN power amps start with the transistor

The first step in designing a microwave frequency power amplifier monolithic microwave integrated circuit on a given GaN foundry process is to select the transistor size and bias, writes Liam Devlin. The high breakdown voltage and operating temperature capability of high electron mobility transistors (HEMTs) fabricated on a gallium nitride…

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All SiC switching fits 10kW converter into five litre box

Rohm Semi and German lab Fraunhofer ISE have used SiC (silicon carbide) transistors to squeeze a 10kW power converter into 23 x 21 x 10cm and 4,5kg. For better efficiency, the topology chosen is mixed voltage neutral-point clamped (MNPC, see diagram) – also known as ‘neutral point piloted’ (NPP…

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GravityLight replace kerosene with a wind-up light

GravityLight is a mass-powered light for places where there is no electricity. Hang a 12.5kg bag of rocks the hook, and it slowly falls 2m over 20 minutes producing electricity for the LED. The artists impression is of the second version, GL2, which is now well on the…

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