500 MHz bandwidth, inductive current shunt measures fast switching to 250A

500 MHz bandwidth, inductive current shunt measures fast switching to 250A

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This inductive current shunt enables current measurements of very high bandwidth, in the range 160 kHz-500 MHz. It is available with a range of full-scale measuring ranges of extending up to ±250A. It introduces essentially zero resistance into the measured current path, and inductance of only 300 pH.
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This inductive current shunt enables current measurements of very high bandwidth, in the range 160 kHz-500 MHz. It is available with a range of full-scale measuring ranges of extending up to ±250A. It introduces essentially zero resistance into the measured current path, and inductance of only 300 pH.

The measurement shunt is a product of Fraunhofer Institute for Reliability and Microintegration IZM, in Berlin. You might use it for precision measurement of any current, particularly large currents that are subject to high-speed transients, in power electronics. A specific application is characterising the switching behaviour of high-speed power semiconductor devices, such as the latest silicon carbide and gallium nitride parts.

It is an active, inductive current shunt. The pictures show how the “primary” coil – a slotted cylinder forming a single turn – is soldered to bridge a gap in a wide PCB conductor. A Rogowski coil sits within the cylindrical element, and the signal processing within the probe carries out integration to produce the signal that you can then view with a conventional oscilloscope connection.

 

As a metallic, slotted cylinder, shunt resistance is negligible and inductance added to the measured-current path is 300 pH. Peak voltage isolation is up to 5 kV; slew rate is 5.5 V/nsec; power supply is 5Vdc and the probe outputs a full-scale ±0.8V signal to a scope from an SMB connection, for termination into a 50Ω input. The measurement is made at high impedance to minimise any influence on the measured current.

…next; demonstration…



The last two photographs are from the Fraunhofer IZM demonstration at the PCIM exhibition, 2014; they show how the measurement coil slides into the shunt cylinder, and are shown on a test board that also has a traditional co-axial current shunt in the same path – the background scope traces show identical current waveforms from both inputs.

 

The device, complete with power supply and SMB-to-BNC cabling, costs €3000, and you can buy direct from the Fraunhofer IZM shop at;

www.izm-shop.de

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