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HOB-P high bandwidth current sensor

LEM has introduced a high bandwidth (1MHz) open loop sensor capable of current sensing in some of the harshest environments.

Part of the low power consuming HOB-P series of current transducers, this device was developed specifically to meet high bandwidth sensing requirements when using fast-switching silicon carbide (SiC) MOSFETs in high-voltage pulsed-power circuits where fast and flexible high-voltage pulses are essential

With a response time of < 200 ns – compared to average response times of around 3 microseconds – the HOB-P sensor is capable of measuring DC, AC or pulsed current up to 250A. With a pick-up coil on LEM’s application specific integrated circuit (ASIC), the sensor is capable of reacting like a current transformer. At the same time, it is suited to wide bandgap (WBG) power electronics use cases and applications that require enhanced immunity to the dv/dt (acceleration) issues that SiC power modules tend to be prone to.

Among the demanding applications suitable for the HOB-P unit – with its operating temperature range of -40°C to +105°C – include hand-held plasma cutters, welders and DC-DC converters. Other applications are uninterruptible power supplies, switched mode power supplies, AC variable speed and servo motor drives, and static converters for DC motor drives.

Other features include galvanic separation between the primary and secondary circuit, an integrated busbar and a compact design that enables space-saving THT (through hole technology) PCB mounting. The product range includes the HOB-P 50-P, HOB-P 75-P, HOB-P 100-P, HOB-P 130-P, with the four models covering nominal currents of 50 ARMS, 75 ARMS, 100 ARMS and 130 ARMS.

Neil Tyler

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