According to one embodiment, a management circuit for a portable device includes an input terminal, a first step-up converter, a first step-down converter, and a second step-down converter. The input terminal is coupled to receive a supply voltage from a p...

The protecting method involves periodically operating a thin-layer battery (11) at its maximum discharge current, and disconnecting the battery as soon as a voltage across it reaches a threshold value greater than its critical voltage for the maximum disch...

The method involves supplying voltage to a power supply terminal (5) of a microprocessor (2) and a transceiver (3) of the battery-powered device from a battery (B1) when the supply voltage is equal to or greater than threshold voltage. Another battery (B2)...

The device is connected to a supplying battery (6) with several battery cells (8) in a current supply branch (4a) via two supply lines (5). It is connected to the battery in at least one second supply branch (4b,4c) via supply line. Each current supply bra...

Unnecessary consumption of power of an auxiliary primary battery 2, and other problems have been inherent in a conventional battery system. Such problems have occurred because of frequent switching from a main battery to the auxiliary primary battery 2 whe...

In a power supply device to which a direct voltage can be supplied and which outputs a stabilized voltage for operating an electronic circuit in a motor vehicle, a boost converter is arranged between an input for the operating voltage and an input of a vol...

The circuit has a battery (11) as its energy source and a constant voltage source (13) between the battery and the electric motor (10). A motor voltage is applied to the motor that corresponds to the rated output power of the constant voltage source. The r...