Patent ID: 8314588

Claim:
An electrical power system comprising: an AC generator; a generator control unit (GCU) for varying AC output voltage of the AC generator; a DC bus connected to the AC generator so that DC voltage on the DC bus is directly proportional to the AC output voltage; a battery connected directly to the DC bus; and a control loop connected to receive battery current information and provide control signals to vary the AC output voltage so that battery charge is maintained without battery damage, wherein the control loop comprises: a DC bus voltage comparator connected to compare DC voltage on the DC bus with a reference DC voltage and to produce a DC bus voltage correction signal; a battery adjustment comparator interconnected with the DC bus voltage comparator to compare the DC bus voltage correction signal with battery charging current data and produce a first modified DC bus voltage correction signal; and wherein the GCU is connected to vary the AC output voltage responsively to the first modified DC bus voltage correction signal.