Electronic device, and capacitor capacitance detection method applied to the same

An electronic device comprising:

• a memory configured to store data;
• a capacitor configured to store electrical energy;
• a first circuit configured to be input power supply of a first voltage and output power supply of a second voltage to supply the electrical energy to the capacitor;
• a second circuit configured to control discharging of the electrical energy of the capacitor;
• and
• a third circuit configured to control
• charging of the electrical energy of the capacitor for a first time range from a first time to a second time while the first circuit is input the power supply of the first voltage and outputs the power supply of the second voltage to supply the electrical energy to the capacitor, and
• discharging of the electrical energy of the capacitor for a second time range after the second time to a third time by using the second circuit, while the first circuit is input the power supply of the first voltage and does not output the power supply of the second voltage input to supply the electrical energy to the capacitor.