Current sensing required in the design of smart motor controls and high-efficiency power supplies. The new site detail a wide variety of controllers, resistors, and amplifiers from Microchip and Vishay that are suitable for current sensing applications. The site is designed as a single resource for developers that wish to investigate reliable resistor-based current-sensing solutions.
The Microchip and Vishay Current Sensing Solutions reference site is hosted on the Mouser website. It has links to a wide range of products from the two suppliers, including descriptions of the product and ordering information. The site also features a link to an informative white paper that has been written on how current-sense resistors are used to measure current for closed-loop power control. The white paper is titled “Basics and Trade-offs of Resistor-Based Current Sensing,” and it looks at high-side versus low-side sensing, providing the information on associated amplifier electronics. It also gives information on how to calculate resistor values, selecting the right kind of resistor, and physical connection factors.
The Current Sensing Solutions site also looks at a selection of eight products that have been designed to provide a reliable current sense solution for motor control applications. Current sense resistors often offer the a better solution when compared with Hall-effect devices and current sensing coils. The combination of current sense resistors and amplifiers can meet the demanding needs of rugged industrial applications.
Examples of the products highlighted include the Vishay/Dale WSLF power metal strip resistors. This range of resistors support voltage division, current sensing, and pulse applications. The resistors have low thermal electromagnetic fields (EMF), very low inductance, and offer a resistance range of 0.003 Ω to 0.0003 Ω. The MCP6C02 from Microchip is a high-side current sense amplifier that offers input offset voltage correction for a very low offset drift. This makes them a good choice for motor control, industrial computing, and battery monitor applications. The MCP6C02 amplifiers have a zero-drift architecture, that allows design flexibility while minimising input errors.
More information and white paper