Patent ID: 8404393

Claim:
A liquid fuel cell system which supplies a power supply voltage to an electronic apparatus having a load which fluctuates with time, comprising: a liquid fuel cell unit which outputs a first voltage; a boosting circuit which boosts the first voltage output from the liquid fuel cell unit, and outputs a boosted second voltage to the electronic apparatus; a first control circuit which compares the first voltage output from the liquid fuel cell unit with a preset first threshold voltage, and controls an operation of the boosting circuit in accordance with a comparison result such that the first voltage does not fall below the first threshold voltage or the first voltage does not hold less than the first threshold voltage; and a second control circuit which, when the first voltage is kept not less than the first threshold voltage, compares the boosted second voltage output by the boosting circuit with a preset second threshold voltage, and controls the boosting circuit in accordance with a comparison result such that the second voltage does not exceed the second threshold voltage.