Simultaneous power supply source

DETAILED DESCRIPTION It is an object of the present invention to describe a power transfer device which will provide transition to backup electrical power for any system equipment having an internal DC bus and in particular for computers and other voltage sensitive shipboard electrical systems without any interruption in electrical power to the protected system equipment.
It is further an object of the present invention to describe such a power transfer device which operates in the described manner while being simple in concept and implementation, inexpensive to manufacture, and provides the required electrical power transfers automatically.
Therefore, according to the present invention, a power transfer system for applying backup electrical power to systems equipment having an internal DC bus is described which applies backup power automatically without power interruption and which is straightforward to implement and inexpensive to manufacture.
The power transfer system has a direct current (DC) power bus as a common supply point for protected electrical equipment, thereby making prior art systems which provide power transfer between alternating current (AC) power sources no longer necessary because only one AC source is required.
The use of a DC bus allows the use of AC rectifiers and filters on the AC source inputs, and allows the combining of the resultant DC voltages using isolation devices into one DC power bus.
The DC power bus output is immune to a primary power source falling below a predetermined voltage level, since the backup source will continue to supply DC power.