Wireless Charging Control Method, and Wireless Charging Transmitter and System

A wireless charging control method for an electric vehicle or a wireless charging transmitter includes an inner-loop control circuit, a boost circuit, an inverter circuit, and a transmitting coil, where the inner-loop control circuit is coupled to both the boost circuit and the inverter circuit, and an input end and an output end of the inverter circuit are respectively coupled to the boost circuit and the transmitting coil, and the inner-loop control circuit is configured to obtain a first current reference signal and a sampled current signal of the transmitting coil, compare the first current reference signal with the sampled current signal to obtain an absolute value of a difference between the first current reference signal and the sampled current signal, and adjust a phase shift angle of the inverter circuit or a duty cycle of the boost circuit when the absolute value is greater than a preset deviation.

WIRELESS CHARGING RECEIVER, TRANSMITTER, SYSTEM, AND CONTROL METHOD, AND ELECTRIC VEHICLE

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.

WIRELESS CHARGING ALIGNMENT METHOD AND APPARATUS, WIRELESS CHARGING SYSTEM, AND ELECTRIC VEHICLE

The technology of this disclosure relates to a wireless charging alignment method and apparatus, a wireless charging system, and an electric vehicle, and belongs to the field of wireless charging. In the wireless charging alignment apparatus, a first detection circuit may detect a first induction signal of a power receive coil in a positioning magnetic field generated by a power transmit coil; a second detection circuit may detect a second induction signal of a location detection coil in the positioning magnetic field; and a location determining circuit may determine a location of the power receive coil relative to the power transmit coil based on the first induction signal and the second induction signal.

Frequency locking method, wireless charging system, receiving device, and transmitting device

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.

Transmit end, receive end, method, and system for wireless charging

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.

Wireless charging receiving end and transmitting end, system, control method and electric vehicle

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. A transmitter controller controls an inverter circuit based on the correspondence to enable each low-frequency magnetic field transmit coil to work. Mutual interference between low-frequency magnetic field signals of adjacent parking spaces can be avoided by using the foregoing receiver and transmitter.

Foreign object detection apparatus and method, and wireless charging transmit-end device

The technology of this application relates to a foreign object detection apparatus that includes a controller, a first resonant network, a signal coupler, and a phase difference detector. The signal coupler may obtain a resonance current signal corresponding to the first resonant network, and couple the resonance current signal to a preset carrier signal to obtain a coupled current signal. A frequency of the preset carrier signal can be the same as a frequency of an excitation signal. The phase difference detector may extract a low-frequency signal component from the coupled current signal, and determine a phase difference signal based on the low-frequency signal component. An amplitude of the phase difference signal correspondingly indicates a phase difference between the excitation signal and the resonance current signal. The controller may determine, based on the amplitude of the phase difference signal, whether a foreign object exists in a detection area corresponding to the first resonant network.

Low frequency magnetic field-based positioning system and method, and devices

Low frequency magnetic field-based positioning system and method, and devices

This application provides a positioning system based on a low frequency magnetic field. The positioning system includes a low frequency magnetic field transmit apparatus and a low frequency magnetic field receive apparatus. The low frequency magnetic field transmit apparatus includes a low frequency magnetic field transmit coil, a conflict detect coil, and a magnetic field generation detection control module. The low frequency magnetic field receive apparatus includes a low frequency magnetic field receive coil and a magnetic field detection control module. The conflict detect coil is configured to sense a low frequency magnetic field signal. The magnetic field generation detection control module is configured to: when the conflict detect coil does not sense the low frequency magnetic field signal, control the low frequency magnetic field transmit coil to transmit a first low frequency magnetic field signal. The magnetic field detection control module is configured to: when it is determined that the low frequency magnetic field signal received by the low frequency magnetic field receive coil is the first low frequency magnetic field signal, determine relative positions of the low frequency magnetic field transmit coil and the low frequency magnetic field receive coil based on signal strength of the first low frequency magnetic field signal. According to this application, positioning accuracy of a low frequency magnetic field transmit coil and a low frequency magnetic field receive coil is improved, and applicability is high.

Foreign object detection apparatus and method, and wireless charging transmitter device

Embodiments of this application provide a foreign object detection apparatus and a foreign object detection method. The foreign object detection apparatus includes a controller, a first resonant network, a signal coupler, and a phase difference detector. The signal coupler may obtain a resonance current signal corresponding to the first resonant network, and couple the resonance current signal to a preset carrier signal to obtain a coupled current signal. Herein, a frequency of the preset carrier signal is the same as a frequency of an excitation signal. The phase difference detector may extract a low-frequency signal component from the coupled current signal, and determine a phase difference signal based on the low-frequency signal component. An amplitude of the phase difference signal correspondingly indicates a phase difference between the excitation signal and the resonance current signal. The controller may determine, based on the amplitude of the phase difference signal, whether a foreign object exists in a detection area corresponding to the first resonant network. With the apparatus and the method provided in embodiments of this application, costs of foreign object detection can be reduced, and precision of foreign object detection can be improved.

Foreign object detection apparatus and method, and wireless charging transmitter device

Wireless charging receiving end and transmitting end, system, control method and electric vehicle

Resonant power supply, primary-side feedback excitation power supply controller, method, and control apparatus

A resonant power supply, a primary-side feedback excitation power supply controller, a method, and a control apparatus are disclosed. In the resonant power supply, a bridge circuit is electrically connected to a power supply. The bridge circuit is configured to convert, based on a drive signal, a direct current provided by the power supply into a square wave signal. An LC series resonant network is electrically connected to the bridge circuit and a primary-side winding. The LC series resonant network is configured to convert the square wave signal into an alternating current, and output the alternating current to the primary-side winding. The alternating current includes an input voltage Vt and an input current I r .

Wireless excitation system, detection method, and electric vehicle

An input end of a first power conversion circuit of the system is connected to a power supply, and an output end of the first power conversion circuit is connected to a stator winding of an electrical excitation motor. An input end of a second power conversion circuit is connected to the power supply, and an output end of the second power conversion circuit is connected to a primary side of an excitation transformer. The excitation transformer transmits energy required by an excitation winding of the electrical excitation motor from a stator to a rotor. A first controller controls the first power conversion circuit to inject a current excitation into the stator winding, so that a current is generated on the excitation winding. A detection circuit obtains a response signal of the primary side of the excitation transformer and sends the response signal to a second controller.

Radio excitation system, detection method and electric vehicle

This application discloses a wireless excitation system, a detection method, and an electric vehicle; and relates to the field of electronic and electric technologies. An input end of a first power conversion circuit of the system is connected to a power supply, and an output end of the first power conversion circuit is connected to a stator winding of an electrical excitation motor. An input end of a second power conversion circuit is connected to the power supply, and an output end of the second power conversion circuit is connected to a primary side of an excitation transformer. The excitation transformer transmits energy required by an excitation winding of the electrical excitation motor from a stator to a rotor. A first controller controls the first power conversion circuit to inject a current excitation into the stator winding, so that a current is generated on the excitation winding. A detection circuit obtains a response signal of the primary side of the excitation transformer and sends the response signal to a second controller. When the current generated on the excitation winding causes the secondary side of the excitation transformer to be short-circuited, and when the current generated on the excitation winding causes the secondary side of the excitation transformer to be open-circuited, the second controller controls the second power conversion circuit to inject a pulse current excitation into the primary side of the excitation transformer, and determines an electrical parameter of the excitation transformer by using the response signal. An electrical parameter of the wireless excitation system can be detected by using this system.

Radio excitation system, detection method and electric vehicle

Resonant power source, primary feedback excitation power supply controller and method, and control device

A resonant power supply (10), a primary-side feedback excitation power supply controller (40), a method, and a control apparatus (01) are disclosed, relating to the field of power supply technologies, to simplify a secondary-side circuit of a resolver (11) in a process of controlling a current and a voltage output by the resolver (11). In the resonant power supply (10), a bridge circuit (120) is electrically connected to a power supply (100). The bridge circuit (120) is configured to convert, based on a drive signal, a direct current provided by the power supply (100) into a square wave signal. An LC series resonant network (121) is electrically connected to the bridge circuit (120) and a primary-side winding (110). The LC series resonant network (121) is configured to convert the square wave signal into an alternating current, and output the alternating current to the primary-side winding (110). The alternating current includes an input voltage Vt and an input current I_r. A rectifier bridge (30) is electrically connected to a secondary-side winding (111), and the rectifier bridge (30) is configured to convert the alternating current on the secondary-side winding (111) into a direct current. The primary-side feedback excitation power supply controller (40) is configured to receive the input voltage Vt and the input current I_r, and output the drive signal to the bridge circuit (120).

Resonant power source, primary feedback excitation power supply controller and method, and control device

Transmit end, receive end, method, and system for wireless charging

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.

Positioning system and method based on low frequency magnetic field, and device

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.

Wireless power transmission alignment method and device, wireless power transmission system, and electric vehicle

Novel nampt enzyme agonist and preparation and use thereof

The present invention provides a class of novel NAMPT enzyme agonist and preparation and use thereof, which has a structural formula as shown in formula I or formula II. The present invention screens the NAMPT agonist NAT from the chemical small molecule library, and the NAT exhibits a good cytoprotective effect and a good anti-neurodegeneration effect in animal models of neurodegeneration. We studied the binding of NAT to enzymes, and then carried out multiple rounds of structure optimization based on the chemical structure characteristics of NAT and its enzyme activity properties, and obtained a relatively defined structure-activity relationship. The present patent not only lays the foundation for developing innovative drugs for anti-aging and neurodegenerative diseases, but also theoretically provides a proof-of-concept that enhancing NAMPT enzyme activity plays an important role in neuroprotection.

Wireless charging control method, and wireless charging transmitter and system

A wireless charging control method for an electric vehicle or a wireless charging transmitter includes an inner-loop control circuit, a boost circuit, an inverter circuit, and a transmitting coil, where the inner-loop control circuit is coupled to both the boost circuit and the inverter circuit, and an input end and an output end of the inverter circuit are respectively coupled to the boost circuit and the transmitting coil, and the inner-loop control circuit is configured to obtain a first current reference signal and a sampled current signal of the transmitting coil, compare the first current reference signal with the sampled current signal to obtain an absolute value of a difference between the first current reference signal and the sampled current signal, and adjust a phase shift angle of the inverter circuit or a duty cycle of the boost circuit when the absolute value is greater than a preset deviation.