Circuit and method of adjusting conduction period for energy-recycling circuit

A period determination circuit for determining a conduction period for an energy-recycling circuit, the period determination circuit comprising:

• an indication circuit, coupled to an inductor of the energy-recycling circuit to receive an inductor voltage, configured to generate an indication signal according to the inductor voltage, wherein the indication signal reflects a status corresponding to a first conduction period of the energy-recycling circuit;
• and
• a control signal generator, coupled to a switch of the energy-recycling circuit, configured to generate a control signal with a second conduction period for the switch according to the indication signal;
• wherein the energy-recycling circuit is coupled to a first capacitive component and a second capacitive component;
• wherein the energy-recycling circuit comprises the inductor and the switch coupled between the first capacitive component and the second capacitive component;
• wherein the control signal generator determines the second conduction period according to the first conduction period and the indication signal.