Abstract: Methods and apparatus to control load power in a wireless power transfer system having one or more power receiving devices and one or more power transmitting sources. In embodiments, device temperature, current level, and/or other information can be used to control power to a load energized by a device.

Abstract: Methods and apparatus for a body diode conduction sensor configured for coupling to a switching element. In embodiments, the sensor comprises first and second voltage divider networks coupled to a voltage source and a diode coupled to the switching element and to the first voltage divider network, wherein the diode is conductive at times corresponding to body diode conduction of the switching element decreasing the DC average voltage at the output node of the first voltage divider network. A differential output voltage can be coupled to the first and second voltage divider networks with an output signal corresponding to a time of the body diode conduction of the switching element.

Abstract: Methods and apparatus to control load power in a wireless power transfer system having one or more power receiving devices and one or more power transmitting sources. In embodiments, device temperature, current level, and/or other information can be used to control power to a load energized by a device.

Abstract: A current sensing system and method for wireless energy transfer may include a printed circuit board, wherein the printed circuit board may include at least a first layer, a second layer, and a third layer. A loop of conductive material may be included, wherein the loop of conductive material may include a diameter D3 on the second layer. A coil of conductive material may be included, wherein the coil of conductive material may have at least 2 turns, wherein a majority of the coil of conductive material may occupy the first layer and the third layer with an outer diameter D1 and an inner diameter D2, connected through each of the first, second, and third layers. The loop of conductive material may be coupled to the coil of conductive material.

Abstract: Methods and apparatus for a body diode conduction sensor configured for coupling to a switching element. In embodiments, the sensor comprises first and second voltage divider networks coupled to a voltage source and a diode coupled to the switching element and to the first voltage divider network, wherein the diode is conductive at times corresponding to body diode conduction of the switching element decreasing the DC average voltage at the output node of the first voltage divider network. A differential output voltage can be coupled to the first and second voltage divider networks with an output signal corresponding to a time of the body diode conduction of the switching element.

Abstract: Methods and apparatus to detect a cross-connect situation in a wireless power transfer system having one or more power receiving units (PRUs) and one or more power transmitting units (PTUs). The PTU can perturb a transmit coil signal and look for expected correlation on wirelessly connected PRU to determine the presence of absence of a cross-connect condition.

Abstract: A current sensing system and method for wireless energy transfer may include a printed circuit board, wherein the printed circuit board may include at least a first layer, a second layer, and a third layer. A loop of conductive material may be included, wherein the loop of conductive material may include a diameter D3 on the second layer. A coil of conductive material may be included, wherein the coil of conductive material may have at least 2 turns, wherein a majority of the coil of conductive material may occupy the first layer and the third layer with an outer diameter D1 and an inner diameter D2, connected through each of the first, second, and third layers. The loop of conductive material may be coupled to the coil of conductive material.

Abstract: A vibration isolating and heat insulating hand grip for use with hand held pneumatic chisels and similar pneumatic hand tools. A manually grippable rigid sleeve is slidably mounted on a housing member which surrounds a rigid, tubular shell to define an annular cavity. Internally secured to the shell is a compliant, non-porous sleeve, the shell and the sleeve defining an inflatable annular chamber. A bladder confined between the housing and the shell communicates with the inflatable annular chamber so that movement of fluid back and forth between the bladder and the chamber causes the compliant sleeve to grip or release a tool shank. Such movement of fluid is caused by an annulus internally mounted on the rigid, slidable sleeve in alignment with the bladder.