Importance

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Abstract

An improved power filter circuit is disclosed. The improvement concern providing a clamping device between a ground lead and a terminal of a safety circuit such that when the power filter has its hot and neutral leads properly connected to hot and neutral leads of a utility circuit, a switch of the safety circuit connects the clamping device to be between ground and neutral leads of the power filter circuit, but when the hot and neutral leads of a utility circuit are reversed, the switch of the safety circuit connects the safety circuit directly between the neutral and hot leads of the power filter circuit, thereby creating an indicator, such as a red light, that the hot and neutral leads are reversed, yet the clamping device is now not connected between the neutral and ground leads of the power filter circuit. Accordingly, the clamping device connected between the ground and neutral leads may be rated during normal operations at a lower value, e.g., 20 volts, to protect against possible surges of a lower voltage level between the ground and neutral leads. Further, a capacitor is connected between the ground and neutral leads during normal operations of the power filter circuit. The value of the capacitor is large so as to provide substantially unlimited filtration between neutral and ground during normal connection of the power filter circuit to a power utility outlet. Such filtration protects computers and computerized equipment against malfunction.

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First Claim