Method and apparatus of voltage protection for a welding-type device

摘要

The present invention is directed to an overvoltage protection control that includes a combination of hardware and software that together detect and determine an average voltage of a power signal being supplied by a power source to a welding-type device. The determined average voltage is then compared to a "trip" voltage. If the average voltage is greater than or equal to the trip voltage then the welding-type device is disabled. The present invention may also be implemented as an undervoltage control wherein the detected average voltage is compared to a minimum acceptable average voltage. If the average voltage of the power signal being supplied to the welding-type device is less than the minimum acceptable average voltage, the welding-type device is prevented from being operated.