Wireless power transmitters for transmitting power at extended separation distances utilizing T-Core shielding

A base station for a wireless power transfer system at an operating frequency selected from a range of about 87 kilohertz (kHz) to about 360 kHz, the base system station comprising:

• an interface surface;
• a control and communications unit;
• an inverter circuit configured to receive input power and convert the input power to a power signal;
• a coil configured to transmit the power signal to a power receiver, the coil formed of wound Litz wire and including at least one layer, the coil defining, at least, a bottom face;
• and
• a shielding comprising a ferrite core defining a magnetic core and a magnetic backing comprising a top surface, the magnetic core protruding outward from the top surface of the magnetic backing, and
• wherein the bottom face of the coil and the top surface of the magnetic backing are separated by a separation distance, such that the base station is configured to increase coupling between the coil of the base station and a coil of the power receiver at an extended z-distance.

A power transmitter for wireless power transfer at an operating frequency selected from a range of about 87 kilohertz (kHz) to about 360 kHz, the power transmitter comprising:

• a control and communications unit;
• an inverter circuit configured to receive input power and convert the input power to a power signal;
• a coil configured to transmit the power signal to a power receiver, the coil formed of wound Litz wire and including a first layer and a second layer,
• each of the first layer and the second layer including a respective number of turns in a range of about 4 turns to about 5 turns,
• the coil defining a top face and a bottom face,
• the coil having an outer diameter length in an outer diameter length range of about 40 mm to about 50 mm,
• the coil having an inner diameter length in an inner diameter length range of about 15 mm to about 25 mm, and
• the coil having a thickness in a thickness range of about 2 mm to about 3 mm;
• and
• a T-Core shielding comprising a ferrite core defining a magnetic core and a magnetic backing comprising a top surface, the magnetic core protruding outward from the top surface of the magnetic backing, and
• wherein the bottom face of the coil and the top surface of the magnetic backing are separated by a separation distance, such that the power transmitter is configured increase coupling between the coil of the power transmitter and a coil of the power receiver coil at an extended z-distance, and
• wherein the separation distance is in a range of about 0.1 mm to about 0.5 mm and the extended z-distance is in a range of about 8 mm to about 15 mm.