Patent
Metal detection method, metal detection device, metal detection method for wireless power supply device, and wireless power supply device
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TLDR
In this paper, a high-pass filter circuit (11a) receives the oscillation current (It), removes the fundamental frequency component of the sine wave having a single fundamental frequency, and extracts a highharmonic component.Abstract:
Provided are a metal detection method, a metal detection device, a metal detection method for a wireless power supply device, and a wireless power supply device which are capable of accurately detecting whether an object is a metal or a nonmetal. An oscillation circuit (10) oscillates and produces a sine wave having a single fundamental frequency, and excites a metal detection coil (Ls) by the oscillation current (It) of the sine wave. An electromagnetic wave of the sine wave having the single fundamental frequency is radiated from the metal detection coil (Ls). A high-pass filter circuit (11a) receives the oscillation current (It), removes the fundamental frequency component from the oscillation current (It), and extracts a high-harmonic component of the fundamental frequency. A comparison circuit (12) determines the presence or absence of a metal.read more
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References
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