Patent ID: 11424673

Abstract:
A power supply circuit is configured to supply power to a load based on power generated by a power generation element. The power supply circuit includes an input capacitor configured to store the power generated by the power generation element, a voltage conversion circuit including an enable terminal and being configured to output, to the load, an output voltage obtained by converting an input voltage between both ends of the input capacitor, and a starter circuit configured to apply a voltage to the enable terminal of the voltage conversion circuit. The starter circuit is configured to start up the voltage conversion circuit by applying an enable voltage to the enable terminal of the voltage conversion circuit. The voltage conversion circuit is configured to output the output voltage in an operating state after starting up when the input voltage is equal to or higher than a first threshold. The starter circuit is configured to apply the enable voltage to the enable terminal when the input voltage is equal to or higher than a second threshold higher than the first threshold. This power supply circuit can stabilize power supplied to the load.