COMBINATION OF HIGH-SIDE AND LOW-SIDE CURRENT SENSING IN SYSTEM FOR PROVIDING POWER OVER COMMUNICATION LINK

摘要

A system for supplying power to a load (LOAD) over a communication link (between 14 and 16) has high-side current sensing circuitry for measuring a high-side current value, low-side current sensing circuitry for measuring a low-side current value, and control circuitry (18) responsive to both the high-side current value and the low-side current value to detect a fault condition, detect information from the load, and/or transmit information to the load by creating a prescribed unbalance between the high-side current and the low-side current.