Abstract: A battery charging circuit includes a buck converter, a charge pump power converter, a sensor external to or internal to the battery charging circuit, and a control unit. The charge pump power converter includes an output coupled to an output of the buck converter for charging a battery. The sensor is configured to sense a total input current. The control unit receives the total input current that is sensed and compensates for a variation in an input current to the charge pump power converter based on whether the total input current meets a specified current variance.

Abstract: A battery charging circuit includes a buck converter, a charge pump power converter, a sensor external to or internal to the battery charging circuit, and a control unit. The charge pump power converter includes an output coupled to an output of the buck converter for charging a battery. The sensor is configured to sense a total input current. The control unit receives the total input current that is sensed and compensates for a variation in an input current to the charge pump power converter based on whether the total input current meets a specified current variance.

Abstract: An apparatus for receiving wireless power is provided. The apparatus a communication circuit configured to transmit a first indication of a first wireless charging category associated with the apparatus. The communication circuit is further configured to receive an indication of a wireless charging class of a power transmit unit (PTU). The communication circuit is further configured to transmit a second indication of a second wireless charging category associated with the apparatus based on the wireless charging class of the PTU being compatible with a higher wireless charging category than the first wireless charging category. The apparatus further comprises a coupler configured to receive a level of wireless power corresponding to the second wireless charging category. The higher wireless charging category indicates an ability to receive a greater amount of wireless power than the first wireless charging category.

Abstract: A method and system for providing wireless power transfer through a metal object is provided. In one aspect, an apparatus for wirelessly receiving power via a magnetic field is provided. The apparatus includes a metal cover including an inner portion and an outer portion. The outer portion is configured to form a loop around the inner portion of the metal cover. The outer portion is configured to inductively couple power via the magnetic field. The apparatus includes a receive circuit electrically coupled to the outer portion and configured to receive a current from the outer portion generated in response to the magnetic field. The receive circuit is configured to charge or power a load based on the current.

Abstract: Certain aspects of the present disclosure relate to methods and apparatus for limiting the power drawn by a battery charger based on monitoring of the input voltage and input current supplied to the battery charger from a power supply. In certain aspects, a method generally includes sensing an output voltage of the power supply, wherein the output voltage of the power supply is variable. The method further includes sensing an output current of the power supply. The method further includes providing the output voltage and output current to a battery charger. The method further includes generating a control signal indicative of a scaling of the output current based on a scaling factor, wherein the scaling factor is based on the output voltage. The method further includes providing the control signal to the battery charger to control the output current supplied by the power supply to the battery charger.

Abstract: Devices and methods for controlling a power supply of a wireless power transmitter based on the request of a wireless power receiver are disclosed. One embodiment provides a wireless power receiver. The wireless power receiver includes a power receiver circuit configured to receive power from a wireless power transmitter at a level sufficient to power or charge a load. The wireless power receiver also includes a processor circuit configured to adjust a level of the received power being provided to the load based on a change in a level of received power to be requested to the wireless power transmitter. The processor circuit is further configured send to the wireless power transmitter the request to change the level of the received power to a first different level.

Abstract: The present disclosure describes aspects of managing communication control for wireless power transfer. In some aspects, a method for managing wireless charging communications is provided. The method includes wirelessly receiving power from a wireless power transmitter and providing the wirelessly received power to a power management circuit. The method further includes providing power and a power source indication signal to a transceiver circuit. The power source indication signal is indicating the power is the wirelessly received power.

Abstract: Certain aspects of the present disclosure relate to methods and apparatus for limiting the power drawn by a battery charger based on monitoring of the input voltage and input current supplied to the battery charger from a power supply. In certain aspects, a method generally includes sensing an output voltage of the power supply, wherein the output voltage of the power supply is variable. The method further includes sensing an output current of the power supply. The method further includes providing the output voltage and output current to a battery charger. The method further includes generating a control signal indicative of a scaling of the output current based on a scaling factor, wherein the scaling factor is based on the output voltage. The method further includes providing the control signal to the battery charger to control the output current supplied by the power supply to the battery charger.

Abstract: Devices and methods for controlling a power supply of a wireless power transmitter based on the request of a wireless power receiver are disclosed. One embodiment provides a wireless power receiver. The wireless power receiver includes a power receiver circuit configured to receive power from a wireless power transmitter at a level sufficient to power or charge a load. The wireless power receiver also includes a processor circuit configured to adjust a level of the received power being provided to the load based on a change in a level of received power to be requested to the wireless power transmitter. The processor circuit is further configured send to the wireless power transmitter the request to change the level of the received power to a first different level.

Abstract: An apparatus for receiving wireless power is provided. The apparatus a communication circuit configured to transmit a first indication of a first wireless charging category associated with the apparatus. The communication circuit is further configured to receive an indication of a wireless charging class of a power transmit unit (PTU). The communication circuit is further configured to transmit a second indication of a second wireless charging category associated with the apparatus based on the wireless charging class of the PTU being compatible with a higher wireless charging category than the first wireless charging category. The apparatus further comprises a coupler configured to receive a level of wireless power corresponding to the second wireless charging category.

Abstract: A method and system for providing wireless power transfer through a metal object is provided. In one aspect, an apparatus for wirelessly receiving power via a magnetic field is provided. The apparatus includes a metal cover including an inner portion and an outer portion. The outer portion is configured to form a loop around the inner portion of the metal cover. The outer portion is configured to inductively couple power via the magnetic field. The apparatus includes a receive circuit electrically coupled to the outer portion and configured to receive a current from the outer portion generated in response to the magnetic field. The receive circuit is configured to charge or power a load based on the current.