Provided is a power circuit, a power circuit control method, and a storage medium. The power circuit comprises a buck-boost power conversion circuit (51) and a control circuit (52). The buck-boost power conversion circuit is configured to convert an input voltage (Vin) into an output voltage (Vout). The control circuit is configured to control a working state of the buck-boost power conversion circuit according to the input voltage such that the output voltage is greater than or equal to a first output voltage amplitude (Vout1) and less than or equal to a second output voltage amplitude (Vout2). When the input voltage is less than a preset low voltage threshold (Vin2), the output voltage is controlled to be fixed at the first output voltage amplitude; when the input voltage is between the preset low voltage threshold and a preset high voltage threshold (Vin3), the output voltage is controlled to be between the first output voltage amplitude and the second output voltage amplitude; and when the input voltage i
