Switch control for domestic appliance - uses ten Hz control signal for disconnecting supply at zero load to avoid undesirable electromagnetic fields

摘要

The controller switches the supply to an installation off at zero load demand, and on again if a load was reconnected. Typically it is applicable to a domestic installation, removes biologically or enrionmentally undesirable electromagnetic field when there is no power demand. The control supply for monitoring the reconnection of a load is low voltage direct current. The circuit may be extended by providing an alternative monitoring supply which is actively biologically beneficial. It is in parallel with the dc supply and an alternative to it, and can be selected at will. Typically the supply is at 10 Hz and produces electromagnetic field strengths of the order of millivolts per meter.