Power-supply apparatus and power-supply method

The power-supply apparatus according to 2,

• wherein the processor is configured to:
• determine a load resistance by dividing the output voltage by the output current,
• determine a sum of the load resistance and the loss resistance,
• determine a product of the sum and the output current,
• divide the product by the input voltage, and
• calculate the second duty ratio based on a result of dividing the product.

A power-supply method to control a power supply circuit to which an input voltage and an input current are input, configured to include a switching element to be controlled by a control signal so as to generate an output voltage and an output current, the power-supply method comprising;

• calculating a first duty ratio of the control signal so that the output voltage approaches a target voltage;
• calculating a second duty ratio of the control signal for the switching element, based on the input voltage, the input current, the output voltage, and the output current;
• detecting deterioration of the power supply circuit, based on the first duty ratio and the second duty ratio;
• generating the control signal of the first duty ratio when the power supply circuit has not deteriorated;
• and
• generating the control signal for stopping the power supply circuit when the power supply circuit has deteriorated, by a processor.

A computer-readable non-transitory recording medium storing a program that causes a computer to execute a procedure to control a power supply circuit to which an input voltage and an input current are input, configured to include a switching element to be controlled by a control signal so as to generate an output voltage and an output current, the procedure comprising:

• calculating a first duty ratio of the control signal so that the output voltage approaches a target voltage;
• calculating a second duty ratio of the control signal for the switching element, based on the input voltage, the input current, the output voltage, and the output current;
• detecting deterioration of the power supply circuit, based on the first duty ratio and the second duty ratio;
• generating the control signal of the first duty ratio when the power supply circuit has not deteriorated;
• and
• generating the control signal for stopping the power supply circuit when the power supply circuit has deteriorated.