Protection method for mains connected appliances with capacitive load against consequence of idle running, involves comparing voltage at appliance with artificially prepared voltage

摘要

The protection method involves comparing two voltages, using a comparator. The first voltage represents the load voltage, and the second voltage an artificially prepared voltage. If the absolute value of the first voltage is larger than the absolute value of the second voltage, the comparator output signals a fault. The first voltage at the comparator is the output voltage of the mains connected appliance.