Power supply and control circuit that adjusts output power based on variable input power and power supply control method for controlling output power based on variable input power

A power supply, comprising:

• an input power monitor that monitors an input power value and at least an input current value;
• an output power monitor that monitors an output power value;
• an output power controller that varies the output power value by controlling an input current value;
• an output power determiner that determines a determined output power value depending on the input power value notified from the input power monitor;
• and
• a power adjuster that maintains the output power value notified from the output power monitor as the determined output power by controlling the output power controller,
• wherein the output power determiner determines, as the determined output value, a first determined output power value that shows the input current value as a first value and a second determined output power value that shows the input current value as a second value smaller than the first value.

A power supply control method, comprising:

• outputting a first output power value in which an input current value becomes a first value for a first time period by controlling the input current value so that an output power is maintained as the first output power value;
• outputting a second output power value that is smaller than the first output power value for a second time period by controlling the input current value so that the output power is maintained as the second output power value;
• measuring the passage of the first time period with a first timer;
• and
• measuring the passage of the second time period with a second timer after the first timer measures the first time period,
• wherein the first time period does not exceed two hours, and the second output power value is 0.8 or less of the first output power value.

An output power controller, comprising:

• an output power determiner that determines a determined output power value depending on an input power value;
• a power adjuster that adjusts the output power value to the determined output power value by controlling an input current value;
• and
• an input power monitor that monitors at least the input current value to be input to a power supply,
• wherein the output power determiner determines, as the determined output value, a first determined output power value that shows the input current value as a first value and a second determined output power value that shows the input current value as a second value smaller than the first value.