Two to three-wire converter circuit

摘要

A two to three wire converter circuit is disclosed which provides a protective function for users when using power hand tools, appliances or any electrically operated device. Many alternating current electrical supplies provide a hot or high line and a neutral line. Many electrical devices, such as hand tools and appliances, are provided with a high line, neutral and a ground line connected to the housing of the device. The present invention enables the connection of the housing ground line or the housing to the neutral line. The neutral line of an alternating current supply is connected to ground. The present invention provides a circuit for sensing which line is the high line and which line is the neutral line of an electric supply and connecting these to the electrical device only if the neutral line of the supply is connected to the neutral line of the electrical device. This invention serves an essential function since a two-prong plug may be inserted into the conventional electrical supply outlet two ways, the correct way with the normally high sides being connected, or incorrectly with the high side of supply being connected to the neutral line of the electrical device.