Electronic device including a very low voltage generator powering a battery

An electronic device comprising:

• a battery,
• an electrical energy generator, and
• between the generator and the battery, an inductive voltage boost converter, said generator being configured to supply a first voltage lower than a second voltage supplied by the battery, said converter including:
• an inductor whose input terminal is connected to the generator,
• at least a first diode arranged between an inductor output terminal and a battery power supply terminal,
• a first switch arranged between the inductor output terminal and an earth terminal, and
• a controller configured to control the first switch;
• wherein
• said electronic device further includes a circuit to measure said first voltage, which includes:
• a measuring capacitor arranged in parallel with the battery between the earth terminal and the inductor output terminal, said measuring capacitor being smaller than a battery capacitor and having a measuring terminal connected to the voltage measuring circuit;
• a second diode located between the inductor output terminal and the measuring terminal of the measuring capacitor;
• and
• a second switch arranged between said measuring terminal and the earth terminal and controlled by the controller;
• the controller being configured to periodically activate a mode for measuring a measuring voltage at said measuring terminal wherein said controller closes the second switch for a first time interval, so as to empty the measuring capacitor, and closes the first switch for a second time interval so as to establish a measuring current in the inductor, an end of the first time interval occurring before or simultaneously with an end of the second time interval so that energy accumulated in the inductor is partially transferred into the measuring capacitor after the second time interval and thus generates, at said measuring terminal, at an end of the energy transfer, a voltage representative of said first voltage as long as said voltage is less than the second voltage, the measuring capacitor being selected so that the measuring voltage is higher than the first voltage and lower than the second voltage at a minimum voltage of said generator allowing charging of the battery.