Abstract: This application provides a foreign object detection method and apparatus, and a wireless charging system. The foreign object detection apparatus includes a coil array and a foreign object detection circuit. The coil array includes at least one coil group, and each coil group includes four detection coils whose locations are symmetrical to each other. The foreign object detection circuit determine an abnormal-value threshold of each coil group based on induction signals of each coil group and that are obtained in a first time period, and detect, based on the abnormal-value threshold and the induction signals of each coil group, whether there is a foreign object; when it is determined that there is no foreign object, detect, based on the signal threshold of each coil group and induction signals that are of each coil group and that are obtained in a second time period, whether there is a foreign object.

Abstract: An apparatus and a method for detecting a metal foreign matter in a wireless charging system, and a device are provided. The apparatus includes a phase-lock control module, an excitation module, a resonance module, a signal collection module, and a determining module. The phase-lock control module is configured to: adjust a frequency of a first signal and output the first signal to the excitation module and the determining module. The excitation module is configured to: generate a second signal based on the first signal, and output the second signal to the resonance module. The resonance module is configured to output the third signal to the signal collection module under excitation of the second signal. The determining module is configured to determine whether there is a metal foreign matter in an area of the target coil.

Abstract: A lighting apparatus includes a LED module, a light source plate, a heat sink, an antenna, a driver and a light housing. The light source plate is used for holding the LED module. The heat sink has a bottom plate and a lateral wall. The light source plate is placed on the bottom plate. The antenna is disposed on the lateral wall. The driver is used for generating a driving current to the LED module. The driver has a wireless circuit. The wireless circuit is electrically connected to the antenna for transmitting a wireless signal. The light housing is used for holding the heat sink so that the LED module emits light toward a light opening of the light housing.

Abstract: A lighting apparatus includes a wireless circuit board, a driver circuit board, a light source plate, a metal cover and a metal housing. The wireless circuit board is mounted with a wireless circuit. The wireless circuit has a first reference ground terminal. The driver circuit board is mounted with a driver circuit. The driver circuit has a second reference ground terminal. The light source plate is mounted with a LED module. The light source plate is placed on a top side of the metal cover. The first reference ground terminal and the second reference ground terminal are connected to the metal cover as a reference ground. The metal housing and a bottom side of the metal cover forms a container space for holding the driver circuit board and a first portion of the wireless circuit board.

Abstract: Example positioning system based on a low frequency magnetic field and apparatus are described. One example positioning system includes a low frequency magnetic field transmit apparatus and a low frequency magnetic field receive apparatus. The transmit apparatus includes a transmit coil, a conflict detect coil, and a magnetic field generation detection control module. The receive apparatus includes a receive coil and a magnetic field detection control module. When the conflict detect coil does not sense a low frequency magnetic field signal, the magnetic field generation detection control module controls the transmit coil to transmit a first low frequency magnetic field signal. When the received low frequency magnetic field signal is the first low frequency magnetic field signal, the magnetic field detection control module determines relative positions of the transmit coil and the receive coil based on signal strength of the first low frequency magnetic field signal.

Abstract: A light bulb apparatus includes a bulb shell, an antenna, a driver, a light source plate and a bulb cap. The light source plate has a first layer and a second layer. The LED module is disposed on the first layer. The second layer includes a metal portion. The metal portion carries heat generated by the LED module for heat dissipation. The antenna is disposed upon the first layer. A bulb cap is connected to an external power. The driver is electrically connected to the antenna for receiving a wireless signal. The driver converts the external power to a driving current supplied to the LED module.

Abstract: A foreign object detection apparatus and method, and a wireless charger. In the foreign object detection apparatus, a signal generation module generates a first calibration excitation signal based on first indication information received from a processing module and generates at least two first calibration carrier signals based on the first indication information. A phase difference detection module determines, based on each first calibration carrier signal and a first current signal obtained by a foreign object detection module under an action of the first calibration excitation signal, a first phase difference between each first calibration carrier signal and the first current signal. The processing module determines a target initial phase based on the first phase difference, and then generates second indication information. The second indication information indicates the signal generation module to generate a detection carrier signal whose initial phase is the target initial phase.

Abstract: A lighting apparatus includes multiple LED modules, a driver and a wireless circuit. The driver for converting an external power to a driving current. The light source plate includes a first metal layer, an insulation layer and a second metal layer. The second metal layer has a larger thickness than the first metal layer. The first metal layer has a first portion and a second portion. The first portion is used for electrically connecting the multiple LED modules. The second portion forms an antenna radiation part. The insulation layer is between the first metal layer and the second metal layer. The wireless circuit electrically connected to the second portion of the first metal layer. The antenna radiation part is used as an antenna for receiving a wireless signal.

Abstract: A lighting apparatus includes a LED module, a light source plate, a heat sink, an antenna, a driver and a light housing. The light source plate is used for holding the LED module. The heat sink has a bottom plate and a lateral wall. The light source plate is placed on the bottom plate. The antenna is disposed on the lateral wall. The driver is used for generating a driving current to the LED module. The driver has a wireless circuit. The wireless circuit is electrically connected to the antenna for transmitting a wireless signal. The light housing is used for holding the heat sink so that the LED module emits light toward a light opening of the light housing.

Abstract: A lighting apparatus includes a wireless circuit board, a driver circuit board, a light source plate, a metal cover and a metal housing. The wireless circuit board is mounted with a wireless circuit. The wireless circuit has a first reference ground terminal. The driver circuit board is mounted with a driver circuit. The driver circuit has a second reference ground terminal. The light source plate is mounted with a LED module. The light source plate is placed on a top side of the metal cover. The first reference ground terminal and the second reference ground terminal are connected to the metal cover as a reference ground. The metal housing and a bottom side of the metal cover forms a container space for holding the driver circuit board and a first portion of the wireless circuit board.

Abstract: This application discloses a wireless charging receiver, transmitter, system, and control method, and an electric vehicle, and relates to the field of wireless charging technologies. A low-frequency magnetic field receive coil of the receiver converts a low-frequency magnetic field into an induced signal. A receiver controller is configured to: when all low-frequency magnetic field transmit coils stop working, allocate a signal feature different from that of a current induced signal to each low-frequency magnetic field transmit coil, and send a correspondence between each low-frequency magnetic field transmit coil and the allocated signal feature to the wireless charging transmitter; and is further configured to determine, when the low-frequency magnetic field transmit coil works, relative positions of the power transmit coil and the power receive coil by using an induced signal having the allocated signal feature.

Abstract: A light bulb apparatus includes a bulb shell, an antenna, a driver, a light source plate and a bulb cap. The light source plate has a first layer and a second layer. The LED module is disposed on the first layer. The second layer includes a metal portion. The metal portion carries heat generated by the LED module for heat dissipation. The antenna is disposed upon the first layer. A bulb cap is connected to an external power. The driver is electrically connected to the antenna for receiving a wireless signal. The driver converts the external power to a driving current supplied to the LED module.

Abstract: A lighting apparatus includes multiple LED modules, a driver and a wireless circuit. The driver for converting an external power to a driving current. The light source plate includes a first metal layer, an insulation layer and a second metal layer. The second metal layer has a larger thickness than the first metal layer. The first metal layer has a first portion and a second portion. The first portion is used for electrically connecting the multiple LED modules. The second portion forms an antenna radiation part. The insulation layer is between the first metal layer and the second metal layer. The wireless circuit electrically connected to the second portion of the first metal layer. The antenna radiation part is used as an antenna for receiving a wireless signal.

Abstract: A lighting apparatus includes a LED module, a light source plate, a heat sink, an antenna, a driver and a light housing. The light source plate is used for holding the LED module. The heat sink has a bottom plate and a lateral wall. The light source plate is placed on the bottom plate. The antenna is disposed on the lateral wall. The driver is used for generating a driving current to the LED module. The driver has a wireless circuit. The wireless circuit is electrically connected to the antenna for transmitting a wireless signal. The light housing is used for holding the heat sink so that the LED module emits light toward a light opening of the light housing.

Abstract: This application provides a foreign object detection method and apparatus, and a wireless charging system. The foreign object detection apparatus includes a coil array and a foreign object detection circuit. The coil array includes at least one coil group, and each coil group includes four detection coils whose locations are symmetrical to each other. The foreign object detection circuit determine an abnormal-value threshold of each coil group based on induction signals of each coil group and that are obtained in a first time period, and detect, based on the abnormal-value threshold and the induction signals of each coil group, whether there is a foreign object; when it is determined that there is no foreign object, detect, based on the signal threshold of each coil group and induction signals that are of each coil group and that are obtained in a second time period, whether there is a foreign object.

Abstract: A transmit end, a receive end, a method, and a system for wireless charging are provided, and are applied to the field of electric vehicles. A transmit-end controller compares an actual output current of an inverter with a preset upper limit value of an output current of the inverter and controls an output voltage of the inverter based on a comparison result to adjust a current of a transmit coil. A receive-end controller receives a sampled value of the current of the transmit coil that is sent by the transmit-end controller and updates a reference value of the current of the transmit coil when a difference between the sampled value of the current of the transmit coil and the reference value of the current of the transmit coil is greater than or equal to a preset value.

Abstract: This application discloses a phase alignment circuit and method of a receive end, and a receive end, where the phase alignment circuit and method of a receive end. The receive end is located on the electric vehicle. The circuit includes: a phase measurement circuit and a controller. The controller is configured to: use, as an actual phase shift angle, a result obtained by subtracting the phase difference from a preset phase shift angle, and control a phase of a bridge arm voltage of the rectifier to lag behind the phase of the input current fundamental component by the actual phase shift angle. The controller outputs a drive signal for a controllable switching transistor of the rectifier by using the actual phase shift angle. Because a lagging phase caused due to filtering is compensated for, precision of synchronization between the bridge arm voltage and the input current can be increased.

Abstract: This application provides a frequency locking method, a wireless charging system, a receiving device, and a transmitting device for determining, through interaction between the receiving device and the transmitting device in a wireless charging scenario, whether a frequency locking procedure can be performed between the transmitting device and the receiving device. The receiving device includes: a controller, configured to control short-circuiting of an input terminal of a rectifier; a transceiver, configured to transmit a frequency locking request to the transmitting device, where the frequency locking request carries information about a first preset range, and the frequency locking request requests the transmitting device to generate an emission current whose frequency is within the first preset range; a receiving module, configured to obtain an input current of the rectifier based on the emission current; and a detector, configured to detect a frequency of the input current.

Abstract: A lighting apparatus includes a wireless circuit board, a driver circuit board, a light source plate, a metal cover and a metal housing. The wireless circuit board is mounted with a wireless circuit. The wireless circuit has a first reference ground terminal. The driver circuit board is mounted with a driver circuit. The driver circuit has a second reference ground terminal. The light source plate is mounted with a LED module. The light source plate is placed on a top side of the metal cover. The first reference ground terminal and the second reference ground terminal are connected to the metal cover as a reference ground. The metal housing and a bottom side of the metal cover forms a container space for holding the driver circuit board and a first portion of the wireless circuit board.

Abstract: A wireless charging receiver, system, and control method, and relates to the field of wireless charging technologies are disclosed. A receiver coil of the receiver converts an alternating magnetic field transmitted by a transmitter to an alternating current, and delivers the alternating current to a compensation network. The compensation network compensates the alternating current, and then delivers the compensated alternating current to a rectifier. The rectifier rectifies the compensated alternating current to a direct current, and supplies the direct current to a load. The compensation network is a compensation circuit with a current source characteristic, so that the receiver coil and the compensation network, acting together with the transmitter, make an input end of the rectifier a constant current source.