Low cost frequency conversion by using microcontroller to open or close a transistor supplying power to an inductive load after comparing an actual current measurement with a desired reference value

摘要

An inductive load (74) is supplied at voltage (V) from a source (60) via a controlling transistor (50) and an ammeter (70). A microcontroller (10) sends a desired reference signal (12) to a comparator (30) through a bus (14) and a (20). The comparator signals the microcontroller to indicate whether the measured current is greater or less than the desired reference and the microcontroller opens or closes the transistor