LEM aims for current sensor with 16bit sigma delta output
LEM in Switzerland has launched the first Integrated Current Sensor with a Sigma Delta bitstream output. This is the first step to a digital current sensor with a 16bit output.
The HMSR DA is aimed at applications that are prone to noise, distortion and interference, providing clean signals and avoiding significant problems from vibration and electromagnetic noise.
Integrating the current sensor with a digital sigma delta converter improves the signal to noise ratio (SNR) and reduces the cost and footprint, replacing a shunt resistor, digital insulator and power supply circuit. The Sigma Delta bitstream output is not only easy to use but is also highly flexible which means customers can apply filters to adapt the sensor to their specific needs.
Typical applications for the digital output unit include standalone servo drives, robotics, sewing machines, automated guided vehicles (AGVs), CNC machine tools and a range of other applications that need an output resolution of 11 to 13bits.
The current sensor runs from a 10MHz clock and the company is working on the next generation with a resolution of 14 to 16 bits and a clock operating above 20MHz.
Analogue versions of LEM’s HMSR integrated current sensors have been in use for many years, with strong immunity to stray fields, reinforced isolation and a 300kHz bandwidth. The HMSR family provides a robust, compact and very accurate solution for measuring DC and AC currents in highly demanding switching power applications for the commercial and industrial sectors.
”Digitalization is the future and we are proud at LEM to be at the forefront of digital Integrated Current Sensor technology. We know that power electronics engineers, who are often faced with challenges such as noise, distortion and interference, will warmly welcome this compact and low-cost alternative compared with solutions that are currently on the market,” said Bastien Musy, VP of Global Product Management for LEM. “Our developers have created an Integrated Current Sensor that takes the sector to a whole new level and they will continue to produce solutions that push the boundaries and deliver in highly demanding applications where competing products in the market traditionally struggle.”
The HMSR DA will be shown for the first time at the PCIM Europe 2022 power electronics exhibition in Nuremberg, Germany next week.
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