Author Archives: steve bush

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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1.7kW automotive dc-dc weighs 324g, due to GaN switching

French PSU maker BrightLoop Converters has built its latest automotive dc-dc converter around GaN transistors from EPC. “By switching from silicon transistors to gallium nitride,” said EPC. “BrightLoop was able to increase the switching frequency of their design from 200kHz to 600kHz, while keeping the same efficiency. This design change increased the power density of the solution ...

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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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Polymer stops solar panel connector fires

Sandia National Laboratories has developed a polymer that helps prevents fires caused by ageing solar panel connectors. The problem is that corrosion inside such connectors can cause heating through increased series resistance, and eventually arcing. “As solar panels become more efficient, they’re able to produce more power,” said Sandia researcher Kenny Armijo, who has spent ...

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Arrow Electronics appoints v-p engineering

Arrow Electronics has appointed Margit Tischler as vice president engineering of its components business for Europe, Middle East and Africa. “Engineering services are a core part of Arrow’s business,” according to the company. “Arrow has built on its technology relationships with suppliers by establishing an ecosystem of companies with whom it can deliver additional engineering ...

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Zytronic gets designed into large interactive displays

Californian public display maker Ideum has chosen Zytronic of Newcastle to supply touch screen sensors for its next-generation Pano Duo 49” interactive touch table. Zytronic’s proprietary technology, branded ZyBrid, is multi-touch projected capacitive. “The crucial difference between the first generation Pano Duo 49” table and Ideum’s new one is the transition from an infra-red touch ...

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