This isolated current measurement reference design uses external shunts, reinforced isolation amplifiers and isolated power supply. The shunt voltage is limited to 25-mV max. This reduces power dissipation in the shunt to enable a high-current measurement range up to 200 A. Shunt voltage is amplified by an instrumentation amplifier configuration with a gain of 10 to match the input range of the isolation amplifier for better signal-to-noise ratio. The output of the isolation amplifier is level shifted and scaled to fit the input range of 3.3-V ADCs. This design uses a free running transformer driver operating at 410 kHz for generating isolated supply voltage in a small form factor to power the high voltage side of the circuit.
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
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Reference design overview and verified performance test data
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| Type | Title | Date | ||
|---|---|---|---|---|
| * | Design guide | Shunt Based High Current Measurement 200-A Reinforced Amplifier Design Guide (Rev. A) | Sep 21, 2016 |
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