Foreign matter detection means, the power transmission apparatus, power receiving apparatus and a wireless power transmission system

The present disclosure provides an apparatus for detecting species, power transmitting means, power receiving apparatus and a wireless power transmission system. Foreign matter detection device comprising: an oscillation circuit (100) having a coil (110) and a resonant capacitor (Cx, Cy), configured to output a voltage cycle comprises an AC component and a DC component, said AC component having a positive cycle and negative ; and when the electrical line, which detects foreign matter close to the coil (110), a change from the oscillation circuit (100) a change of the AC component of the output of the voltage and the DC component.