Electrical power supply device especially for portable apparatuses

摘要

The power supply device includes an electrochemical cell such as a lithium-carbon cell (10), or a number of such cells in series, which feeds a chopper voltage-boosting convertor comprising a series inductor (14) and a diode (15) whose common connection is earthed through a power MOSFET controlled switch (17). The diode supplies the external load (2) with DC power, smoothed by a compact low-impedance preferably an active carbon or metal-oxide super-capacitor (12). The switch is controlled by a function (F1) of the diode input current (Is) with an external control (C) stopping the convertor in a reception mode. The function is activated and inhibited (F2) according to the output voltage (Us).