Patent ID: 7276814
Filing Date: 2007-10-02
Classification: G06F,H02M,H04L,H05K

Abstract:
1. In a network having at least two Intelligent Electronic Devices (IEDs) with at least one electrical connection between the at least two IEDs in the network, a power supply for providing power from an external source to internal components of an associated IED of the at least two IEDs, said power supply circuit comprising: a power input connection for receiving power from the external source at a received voltage with respect to ground; a first DC to DC converter for converting the power from the received voltage to an intermediate voltage and providing a first level of isolation for the internal components of the IED; a second DC to DC converter for receiving power from the first DC to DC converter at the intermediate voltage and converting the power from the intermediate voltage to an internal voltage to be used by the internal components of the associated IED, and, providing a second level of electrical isolation for the internal components of the IED; and wherein the first level of isolation is greater than the second level of isolation to protect the internal components of the IED from adverse electrical effects.