A SYSTEM FOR AND A METHOD OF SENSING HIGH VOLTAGE MAINS AC TO PROVIDE A SAFETY BARRIER ISOLATION BETWEEN HAZARDOUS MAINS UTILITY GRID AND AN USER ACCESSIBLE LOW VOLTAGE DEVICE

摘要

The invention relates to a system for and a method of sensing high voltage mains AC to provide a safety barrier isolation between hazardous mains utility grid and an user accessible low voltage device, the system comprising a high voltage resistor network operably connected to the AC mains grid generating sine waves including hazardous signals, the network eliminating the forward voltage drop at the rectification stage; and an user accessible low voltage operated micro-controller based device, characterized by comprising an isolation amplifier operably interposed between the high voltage resistor network and the user accessible device to supply to the device the sine wave signal in the Original shape of the signal initially outputted from the AC main grid so as to provide a safety barrier between the AC main grid and the low-voltage user accessible device.