Power regulating supply system for AC electrical loads

摘要

Electrical line voltage energy from an AC power network is combined with the energy derived from an auxiliary DC voltage source through the primary winding of a transformer to operate an AC load under rated conditions normally associated with its operation by the AC power network alone. The DC voltage is converted to a form compatible with said rated operation of the load under control of AC signals sampled from the AC power network. Line voltage from the AC power network to the transformer primary is blocked when sufficient energy is available from the DC voltage source alone to operate the load.