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A New Approach to Circuit Breaker Design Using Silicon Carbide Switches - Nov 21
Mechanical circuit breakers can be low cost with minimal losses, but they operate slowly and wear out. Solid state versions overcome the problems and are becoming increasing viable as replacements at...
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Isolated current transducers save space in harsh conditions
The GHS components offer full isolation despite their small size, claims the company, integrating the primary conductor for nominal current measurements of 10, 12, 16 or 20A with a measurement span of 2.5 times the nominal current. They are also able to support high overload currents up to 200A peak for short durations of 1.0ms.

The transducers are mounted directly onto a PCB as an SO8 SMD device, reducing manufacturing costs and providing space saving for space-constrained applications.

They can be used as low resistance primary conductors (minimising power losses) within an ASIC to allow direct current measurement and consistent insulation performance. At the same time, they provide high creepage and clearance distances.

All the models in the series provide a ratiometric analogue voltage output with different sensitivity levels from 40 to 80mV/A according to the model, with a typical response time of 5.0micro sec.

The transducers are not simple open loop Hall-effect ASIC-based transducer, says the company, they have been designed with primary integrated conductors for gradient measurement to provide immunity against the external fields found in power electronic applications.

The design combnes spinning, programmable internal temperature compensation (EEPROM) which is claimed to provide accuracy over the full temperature range of -40 to 125°C, with a maximum 1.3% offset drift and 1.5% gain drift. Operation is from a single 5.0V supply.  




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