Power Electronics News

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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Silicon carbide device start-up powers ahead in Coventry

Coventry-based start-up Anvil Semiconductors is developing power diodes, power mosfets and perhaps LEDs using a novel silicon carbide (SiC) process technology. The company’s technique is to deposit SiC with a “3C” crystal structure on a silicon wafer, in effect SiC-on-silicon. Transistors made from SiC and…

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GaN on show at PCIM Asia

Transistor maker GaN Systems of Canada will be showing a 650V 30A three-phase inverter power module from LS Industrial Systems of Korea made using GaN transistors on its stand at PCIM Asia. Also featured will be a 3kW, 800/380V DC/DC bidirectional converter developed by the NextHome consortium…

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Battery swap charges moped in 10 seconds

Smartscooter from Gogoro is an electric moped that charges in under 10s – because it has swappable batteries. As such it needs special battery swap stations – particularly as home charging is said to be impossible – the first infrastructure for which is being installed in Taipei. Drive up to the charge station…

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