The present invention discloses an electrical power supply (54) for providing electrical power to a load (62), the power supply (54) comprising a plurality of energy storage elements (100,200,300) each having a different operating characteristic and connec...

A microcomputer (1) outputs a command to a control IC (2) to operate first and second loads (6, 9). The control IC (2) sets first and second DC/DC converters (4, 7) on-state to operate the first and second loads (6, 9). The first DC/DC converter (4) conver...

A second voltage branch (3) has a power reservoir (PR) (5) charged up by an auxiliary voltage with a higher voltage value than that available in a first voltage branch (2). Power in the PR can be extracted by connected equipment (4) through pulses via deep...

The device has a branch with a transformation unit (7) to transform an alternating voltage from a supply network into an equivalent direct voltage. Another branch has a transformer (8) to bring a direct voltage supplied by a battery to a direct output volt...

In order for a backup battery (3) to prolong a backup time period for a mobile instrument, a control signal Sc1 becomes either low level or a high level in accordance with determination if a power supply voltage Vm of a main battery (2) is either lower or ...