Patent ID: 6115276
Filing Date: 2000-09-05
Classification: H02J

Abstract:
For use with a power plant having a primary power supply that provides primary power to an AC bus for subsequent conversion to DC power, a backup power supply for providing backup power to said AC bus, comprising:a battery charger/inverter having first and second secondary switches and first and second charging switches, coupled to said AC bus and couplable to a battery, operable in:a normal mode, wherein said first and second secondary switches are employed as synchronous rectifiers to convert a portion of said primary power to charge said battery, said first charging switch controlling a charging current and a charging voltage applied to said battery; anda battery backup mode, wherein said first and second secondary switches are employed as an inverter to convert DC power from said battery to provide said backup power to said AC bus, said second charging switch boosting a voltage of said battery to a voltage of said AC bus.