There’s a problem with the way we measure current in high-voltage systems. While inverters and high-power systems need current information to maintain safe operating conditions, improve system efficiency, and respond quickly to load changes; measuring current on a high-voltage rail can be a real challenge. Sensors have to be electrically isolated from the system controller, sensors have long delays limiting response time, accuracy over temperature ranges is difficult to maintain, and systems are noisy.

How does the Si8920 isolated amplifier solve for these challenges? Let’s take a look:

In contrast with traditional amplifiers, the Si8920 is the industry’s fastest isolated current sense amplifier. It provides precise current shunt measurement for power control systems, including motor drivers and inverters.

Ideal use cases for the Si8920 include industrial motor drivers, solar inverters, high-voltage power systems, uninterruptible power supplies (UPS) and electric/hybrid-electric (EV/HEV) vehicle systems.

Here’s an example of an AC Motor Drive that uses the Si8920 to measure current both on the high-voltage DC Link (+), as well as on the legs of the motor.

For more information on the Si8920, visit our website.