Patent ID: 7746036

Claim:
A method to charge batteries of portable devices simultaneously with supplying power to these devices for their operations is comprising the following steps: (1) providing a DC power source, a supply regulator, one or more rechargeable batteries, a battery charger controlled by a digital control unit, a voltage comparator, and a capacitor; (2) setting charge current to charge batteries to a predefined default current level; (3) delaying process flow for a defined time interval and go then to step (4); (4) checking if voltage at inputs of said portable device and of said battery charger is lower than a defined threshold voltage, and, if positive, go to step (5) else go to step (7); (5) checking, if said charge current is zero, and if positive, go to step (3) else go to step (6); (6) decreasing said charge current and go then to step (3); (7) checking if said charge current is smaller than said predefined default current level, and if positive, go to step (8), else go to step (3); and (8) increasing said charge current and go then to step (3).