Boost converter

A boost converter, comprising:

• a first inductor, receiving an input voltage;
• a power switch element, comprising a parasitic capacitor, wherein the power switch element determines whether to couple the first inductor to a ground voltage according to a clock voltage;
• an output stage circuit, comprising a first resistor, and coupled to the first inductor and the power switch element, wherein the output stage circuit generates an output voltage;
• a controller, detecting a resistive voltage of the first resistor, and generating the clock voltage, a first control voltage, and a second control voltage according to the resistive voltage;
• a resonant circuit, coupled to the first inductor, and selectively enabled or disabled according to the first control voltage;
• and
• a discharging circuit, determining whether to couple the resonant circuit to the ground voltage according to the second control voltage;
• wherein when the resonant circuit is enabled, the resonant circuit resonates with the first inductor and the parasitic capacitor, so as to fine-tune an inductive current flowing through the first inductor.