Overvoltage protection circuit and overvoltage protection control method

An overvoltage protection circuit comprising:

• a comparator configured to compare a DC voltage supplied to a first load by a plurality of power generators connected in series with a first value set based on an upper limit of an operating voltage of the first load and a second value set based on a lower limit of the operating voltage of the first load, wherein the first value is larger than the second value;
• a storage element configured to be charged with a current generated by one or more power generators of the plurality of power generators;
• and
• a switch configured to change a flow of the current so that:
• when the DC voltage is higher than the first value, a current to the first load is interrupted, by the switch,
• when the DC voltage is lower than the second value, the plurality of power generators supplies the first load with power and the storage element supplies the first load with power, by the switch, and
• when the DC voltage is lower than or equal to the first value and higher than or equal to the second value, the current is supplied to the first load, by the switch.

An overvoltage protection control method comprising:

• comparing a DC voltage supplied to a first load by a first power generator with a first value set based on an upper limit of an operating voltage of the first load;
• changing a flow of a current generated by the power generator so that:
• when the DC voltage is higher than the first value, a portion of the current is supplied to a storage element and a second load coupled to the storage element in parallel, and
• when the DC voltage is less than or equal to the first value, the storage element supplies the second load with power.