Patent ID: 7535123
Filing Date: 2009-05-19
Classification: H02J

Abstract:
1. An apparatus for selecting a power supply in a dual supply system, the apparatus comprising: a connection director unit, the connection director unit presenting a plurality of actuating signals; a first switching unit coupled to the connection director unit, coupled to a first power supply and coupled to the system, wherein the first switching unit generating a first indicating signal to indicate whether a first switch is closed; a second switching unit coupled to the connection director unit, coupled to a second power supply, and coupled to the system, wherein the second switching unit generating a second indicating signal to indicate whether a second switch is closed; wherein the first switching unit is coupled to the second switching unit, and wherein the first switching unit responds to a first signal combination of the second indicating signal and at least one first actuating signal of the plurality of actuating signals for effecting a first coupling between the system and the first power supply; and wherein the second switching unit is coupled to the first switching unit, wherein the second switching unit responds to a second signal combination of the first indicating signal and at least one second actuating signal of the plurality of actuating signals for effecting a second coupling between the system and a second power supply, and wherein the second actuating signal including an initiating signal and an operating signal, and wherein the second switching unit responding to the initiating signal to establish a generally time-dependent increasing current between the system and the second power supply, and wherein the at least one second switching unit responds to the operating signal to establish a substantially constant operating current between the system and the second power supply.