Electronic device, method and computer-readable medium

An electronic device, comprising:

• a power source having a predetermined level of power capacity;
• a plurality of power-consuming devices configured to operate by power supplied from the power source;
• a USB (Universal Serial Bus) interface configured to deliver power supplied from the power source to an external device when the external device is connected with the USB interface;
• a printer configured to form an image on a sheet;
• an image reader configured to read an image;
• a command receiver configured to receive a command for executing a job;
• and
• a controller configured to:
• receive a signal from a power measurer, the signal corresponding to a level of power being output from the power source within a time segment in which the command is received, the time segment being one of a plurality of time segments, into which a time length from start to end of the job is divided, the job being at least one of a print job, in which the controller is configured to control the printer to form the image on the sheet, and a scanning job, in which the controller is configured to control the image reader to read the image, while the power is being delivered to the external device through the USB interface and detect a value of power being consumed in the external device from the received signal within the time segment;
• and
• in a case where the detected value of the power is a first value, control the power source to restrict the power to be delivered to the external device to a greater extent than the power to be delivered to the external device is restricted when the detected value of the power is a second value smaller than the first value.

A method to control an electronic device comprising a power source having a predetermined level of power capacity;

• a plurality of power-consuming devices configured to operate by power supplied from the power source;
• a USB (Universal Serial Bus) interface configured to deliver power supplied from the power source to an external device when the external device is connected with the USB interface;
• a printer configured to form an image on a sheet;
• an image reader configured to read an image;
• a command receiver configured to receive a command for executing a job;
• a memory configured to store values of power consumable in the plurality of power-consuming devices;
• and a controller, the method comprising:
• in a case where the command for executing a job is received by the command receiver, the job being at least one of a print job, in which the controller is configured to control the printer to form the image on the sheet, and a scanning job, in which the controller is configured to control the image reader to read the image, forecasting at least one of the plurality of power-consuming devices to be used in a time segment, the time segment being one of a plurality of time segments, into which a time length from start to end of the job is divided;
• calculating a level of total operation power being a sum of power required by the forecasted at least one of the plurality of power-consuming devices for the time segment with reference to the values of power stored in the memory and current progress of the job, the total operation power fluctuating among the time segments over the time length of the job;
• and determining a level of the power to be delivered to the external device in the time segment based on the level of the total operation power and the level of the power capacity in the power source;
• and
• controlling the power source to deliver the determined level of the power to the external device through the USB interface during the time segment.

A non-transitory computer readable medium storing computer readable instructions that are executable by a computer in an electronic device comprising a power source having a predetermined level of power capacity;

• a plurality of power-consuming devices configured to operate by power supplied from the power source;
• a USB (Universal Serial Bus) interface configured to deliver power supplied from the power source to an external device when the external device is connected with the USB interface;
• a printer configured to form an image on a sheet;
• an image reader configured to read an image;
• a command receiver configured to receive a command for executing a job;
• and a memory configured to store values of power consumable in the plurality of power-consuming devices, the computer readable instructions, when executed by the computer, causing the computer to:
• in a case where the command for executing a job is received by the command receiver, the job being at least one of a print job, in which the computer is configured to control the printer to form the image on the sheet, and a scanning job, in which the computer is configured to control the image reader to read the image, forecast at least one of the plurality of power-consuming devices to be used in a time segment, the time segment being one of a plurality of time segments, into which a time length from start to end of the job is divided;
• calculate a level of total operation power being sum of power required by the forecasted at least one of the plurality of power-consuming devices for the time segment with reference to the values of power stored in the memory and current progress of the job, the total operation power fluctuating among the time segments over the time length of the job;
• and determine a level of the power to be delivered to the external device in the time segment based on the level of the total operation power and the level of the power capacity in the power source;
• and
• control the power source to deliver the determined level of the power to the external device through the USB interface during the time segment.