Abstract: A wireless power transfer system includes a transmitter with a transmitting coil, a first detection coil, and a second detection coil. The transmitting coil receives and wirelessly radiates power from a power supply to a receiver of a vehicle. In response to the radiated power from the transmitting coil, the first detection coil generates a first voltage, and the second detection coil generates a second voltage. A comparison system is electrically coupled to the transmitter. The comparison system declares presence of a foreign object in proximity to the transmitter in response to a difference between the first voltage and a first reference voltage exceeding a threshold value. The comparison system declares the presence of the foreign object in response to a difference between the second voltage and a second reference voltage exceeding the threshold value. The transmitter is selectively disabled in response to presence of the foreign object being declared.

Abstract: A wireless power transfer system for charging a battery positioned in a vehicle may include a primary side network, a secondary side network, detection coils, and a charge monitor controller. The secondary side network may be configured to receive power from the primary side network by way of inductively coupling between a transmitting coil of the primary side network and a receiving coil of the secondary side network. The detection coils may be coupled to magnetic cores provided with at least one of the primary side network or the secondary side network. The detection coils may output at least one voltage signal based on the inductively coupling between the transmitting coil and the receiving coil. The charge monitor controller may determine a system diagnosis status based on the at least one voltage signal from the detection coils.

Abstract: A wireless power transfer system includes a transmitter with a transmitting coil, a first detection coil, and a second detection coil. The transmitting coil receives and wirelessly radiates power from a power supply to a receiver of a vehicle. In response to the radiated power from the transmitting coil, the first detection coil generates a first voltage, and the second detection coil generates a second voltage. A comparison system is electrically coupled to the transmitter. The comparison system declares presence of a foreign object in proximity to the transmitter in response to a difference between the first voltage and a first reference voltage exceeding a threshold value. The comparison system declares the presence of the foreign object in response to a difference between the second voltage and a second reference voltage exceeding the threshold value. The transmitter is selectively disabled in response to presence of the foreign object being declared.

Abstract: A wireless power transfer system for charging a battery positioned in a vehicle may include a primary side network, a secondary side network, detection coils, and a charge monitor controller. The secondary side network may be configured to receive power from the primary side network by way of inductively coupling between a transmitting coil of the primary side network and a receiving coil of the secondary side network. The detection coils may be coupled to magnetic cores provided with at least one of the primary side network or the secondary side network. The detection coils may output at least one voltage signal based on the inductively coupling between the transmitting coil and the receiving coil. The charge monitor controller may determine a system diagnosis status based on the at least one voltage signal from the detection coils.