Controller, control method, and control program

A control method for a controller providing a port compatible with DRP (Dual Role Power), which can be either a power supply side or a power reception side according to a USB (Universal Serial Bus) Type-C standard,

• wherein the controller has a signal transmission module for exchanging a signal with a connection destination via a communication line in a USB cable,
• wherein the signal transmission module is configured to indicate whether the port is functioned as the power supply side or the power reception side, and
• wherein the control method comprises:
• when the port is functioned as the power supply side, supplying an electric power stored in a battery to the connection destination;
• when a condition of the battery indicates a Low Battery condition, stopping supplying the electric power to the connection destination while maintaining a state that the port is functioned as the power supply side;
• and
• resuming supplying the electric power to the connection destination according to a sequence as the power reception side when the battery is charged and restored to a condition of supplying the electric power to the connection destination.

A control program, stored on a non-transitory recording medium, executed by a processor of a controller for providing a port compatible with DRP (Dual Role Power), which can be either a power supply side or a power reception side according to a USB (Universal Serial Bus) Type-C standard,

• wherein the controller has a signal transmission module for exchanging a signal with a connection destination via a communication line in a USB cable,
• wherein the signal transmission module is configured to indicate whether the port is functioned as the power supply side or the power reception side, and
• wherein the control program executed by the processor comprises:
• when the port is functioned as the power supply side, supplying an electric power stored in a battery to the connection destination;
• when a condition of the battery indicates a Low Battery condition, stopping supplying the electric power to the connection destination while maintaining a state that the port is functioned as the power supply side;
• and
• resuming supplying the electric power to the connection destination according to a sequence as the power reception side when the battery is charged and restored to a condition of supplying the electric power to the connection destination.