Importance

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Abstract

The invention relates to a power supply device for an RF transmitter (5), the device comprising at least one battery (2) and at least one capacitor (3) electrically connected in parallel between the battery (2) and the RF transmitter (5), and voltage-raising means (4') for charging the capacitor (3) to a storage voltage (V.sub.C) higher than the voltage delivered by the battery during an initial charging stage, the voltage-raising means (4') comprising an inductor (L) and a diode (D) in series, and associated with a switch (40') suitable, during the storage stage, for periodically causing energy to be accumulated in the inductor (L) followed by transferring the accumulated energy into the capacitor (3). According to the invention, a switch-control signal (S.sub.C) is predetermined and of variable period so as to act, during each period, to cause: the switch (40') to close over a fixed duration that is calculated so as to enable the current flowing in the inductor (L) to increase from a value of zero up to a predefined limit value; and the switch (40') to open over a duration that is variable and a function of the voltage (V.sub.C) across the capacitor (3), the duration being defined in such a manner as to enable the current flowing in the inductor (L) to decrease from said predefined limit value to a value of zero.

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First Claim