Inductive power supply and object detection method thereof

An inductive power supply, comprising:

• a power supply module, comprising a power supply coil;
• a resonant capacitor, electrically connected to a first terminal of the power supply coil, wherein there is a node between the first terminal of the power supply coil and the resonant capacitor, and the power supply coil and the resonant capacitor form a resonant circuit, and a resonant signal is generated when the resonant capacitor resonates with the power supply coil;
• a driving unit, electrically connected to the resonant capacitor, wherein the driving unit outputs a driving signal for driving the power supply coil;
• a voltage detector, electrically connected to the node for receiving the resonant signal and converting the resonant signal into a detection signal;
• and
• a processor, electrically connected to the voltage detector and the driving unit, wherein the processor controls the driving unit and obtains a resonant cycle of the resonant signal according to the detection signal when the resonant capacitor resonates with the power supply coil,
• wherein after the driving unit drives the power supply coil, the resonant capacitor resonates with the power supply coil, and a timer of the processor starts timing, wherein when the resonant cycle exceeds a cycle threshold, the timer stops timing, the processor calculates and obtains a measurement of time length according to an interval between the start time and the stop time of the timer,
• wherein when the measurement of time length is less than a preset time length, the processor determines that there is an object within a power transmission range of the power supply module.