Author Archives: steve bush

Heat provides a simple way to separate entangled electrons for research

The thermoelectric effect can be used to produce entangle photons, according to scientists from Finland, Russia, China and the USA. The proof-of-concept device is superconducting and has layered graphene (green) and metal (blue) electrodes on a silicon dioxide substrate (grey). “Superconductivity is caused by entangled pairs of electrons called Cooper pairs,” said Nikita Kirsanov of Aalto ...

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Automotive hypervisor for Renesas RH850 MCU

Green Hills Software has released its secure embedded virtualisation hypervisor, branded µ-visor, for Renesas’ RH850/U2A microcontroller for automotive electronic control units (ECUs) It is “designed to support the emerging automotive cybersecurity requirements of ISO/SAE 21434 and UNECE WP.29 and to meet ISO 26262 ASIL D functional safety,” according to Green Hills. “µ-visor is the basis for consolidation ...

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Wolfspeed SiC power modules for 1.2kV

Wolspeed is aiming at electric vehicle charging and solar power with a family of 1.2kV silicon carbide power modules fitting between single die discrete components and high-current modules. They come in the company’s 63 x 34mm FM3 package in all-n-channel half-bridge and three-phase bridge configuration ant various current capacities – see table below. Connection is ...

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DIN rail controller for uninterruptible 24V power supply

German PSU maker Puls Power has announced a 40A-rated DIN-rail-mounted controller for uninterruptible power supply systems. Called UB40.241, it doubles current capacity compared with the company’s earlier top-end model. The controller mediates between an external 24Vdc power supply (±25%) and external battery pack to bridge power failures and voltage fluctuations by charging the battery when system ...

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Power chip switches 600V with asymmetric GaN power, and includes drivers

STMicroelectronics has introduced an asymmetric half-bridge pair of power GaN transistors in a small (9 x 9 x 1mm GQFN) package that includes driver and protection circuits. Called MasterGaN2, the transistors are: 225mΩ 6.5A high-side 150mΩ 10A low-side “MasterGaN2 is the first in the new family to contain two asymmetric gallium-nitride transistors, delivering an integrated GaN ...

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60W wireless power receiver doubles as 5W transmitter

Renesas has announced a 60W wireless induction power receiver IC, compliant with WPC 1.2.4 and compatible with WPC 1.3+. Called P9418, it can also deliver up to 5W as a wireless power transmitter. Power is transferred through an external LC coupling tank. As a receiver, the device has a all-n-channel synchronous full bridge rectifier to convert ...

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Horizontal USB Type A sockets survive 20,000 mating cycles

Following on from its vertical-mount long-life USB A-type sockets (photo centre), GCT has announced a pair of horizontal-mount extended-life USB A connectors – with added current capacity – aiming them at fast charging and high usage applications. USB1130 (photo left) is a USB-A 2.0 connector tested to 10,000 mating cycles USB1135 (photo right) is a USB 3.0 ...

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Current and voltage chip takes the hard work out of isolated mains measurements

Allegro MicroSystems has integrated power, voltage and current monitoring into a single chip with reinforced isolation. Only a handful of resistors are needed to complete the high-voltage interface (diagram right). Called ACS37800, it uses a Hall effect scheme to measure current and external resistors to stand-off the voltage measurement – no opto-isolators, Rogowski coils, current transformers, isolated operational ...

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Triacs handle full current at 150°C

STMicroelectronics’ 800V 8H triacs operate at full rated current up to the maximum junction temperature of 150°C, allowing heatsinks in drives for AC loads to smaller, claims the company. The family spans 8A to 30A, and the 800V peak off-state voltage allows mains applications including operating from up to 400V three phase. They can withstand ...

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Transparent solar cell from simple metal oxides

A transparent solar cell can be made using straight-forward metal oxides, according to researchers at Incheon National University in Korea. The cell converts the ultra-violet portion of the sun’s spectrum into electricity using a junction made from p-type NiO and n-type TiO2 – the latter a well-known photo-electric material. Unlike more exotic transparent solar absorbers, ...

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