Contactless charging of BLUETOOTH other wireless headsets

• US 9,819,209 B2
• Filed: 01/18/2012
• Issued: 11/14/2017
• Est. Priority Date: 01/18/2011
• Status: Active Grant

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Hunt, Steven E., Jacob, Mathew
• Primary Examiner(s): Barnie, Rexford
• Assistant Examiner(s): Dhillon, Jagdeep
• Application Number:
  US13/353,145
• Publication Number:
  US 20120181855A1
• Time in Patent Office: 2,127 Days
• Field of Search: 307 91, 307 101- 106, 307104, 307149, 307 66, 307 64, 307 43, 320108, 320109, 455 412, 37942001
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/0044 specially adapted for holding portable devices containing batteries H02J7/0045 takes precedence

Abstract

An apparatus includes an adapter having a charging unit defining a space configured to receive a wireless headset. The charging unit includes transmit circuitry configured to wirelessly transmit power to the wireless headset when the wireless headset is inserted into the space of the charging unit. At least a portion of the adapter is configured to be inserted into an auxiliary or accessory power socket of a vehicle. The power socket could represent a cigarette lighter holster.

Claims

1. An apparatus suitable for wireless charging, comprising:

a wireless charging adapter dimensioned for insertion into a powered vehicle receptacle, including

an adapter electrical contact to receive vehicle power when the charging adapter is inserted into a powered vehicle receptacle,

a charging space dimensioned to receive a wireless headset,

transmit circuitry coupled to the adapter electrical contact and including a transmit coil, operable to inductively transmit wireless power through the transmit coil into the charging space, transmit circuitry including a DC-DC converter to convert a direct current (DC) voltage received through the adapter electrical contact into a DC charging voltage to power the transmit circuitry,

an internal power supply to store power, and

switch circuitry to

selectively couple the adapter electrical contact to one of the transmit circuitry and the internal power supply, and

selectively couple the transmit circuitry and the internal power supply.

2. The apparatus of claim 1, wherein the wireless charging adapter further includes a port to at least one of:

receive power from an external device to charge the internal power supply;

provide power from an external device to the transmit circuitry; and

provide power from the internal power supply to an external device.

3. The apparatus of claim 1, wherein the powered vehicle receptacle includes a receptacle electrical contact to contact the adapter electrical contact when the wireless charging adapter is inserted into a powered vehicle receptacle.

4. The apparatus of claim 3, wherein the powered vehicle receptacle is a cup holder adapted as a powered vehicle receptacle including the receptacle electrical contact.

5. The apparatus of claim 1, wherein the transmit circuitry is operable to inductively transmit wireless power through the transmit coil when the wireless headset is inserted into the charging space.

6. The apparatus of claim 1, wherein the switch circuitry is adapted to

selectively couple the adapter electrical contact to one of the transmit circuitry and the internal power supply to receive power from the adapter electrical contact, when the charging adapter is inserted into the powered vehicle receptacle, and

selectively couple the transmit circuitry to receive power from the internal power supply, when the charging adapter is not inserted into the powered vehicle receptacle.

8. The apparatus of claim 1, wherein the wireless charging adapter further includes a port to at least one of:

receive power from an external device to charge the internal power supply;

provide power from an external device to the transmit circuitry; and

provide power from the internal power supply to an external device.

9. The apparatus of claim 1, wherein the powered vehicle receptacle includes a receptacle electrical contact to contact the adapter electrical contact when the wireless charging adapter is inserted into a powered vehicle receptacle.

10. The apparatus of claim 3, wherein the powered vehicle receptacle is a cup holder adapted as a powered vehicle receptacle including the receptacle electrical contact.

7. An apparatus suitable for wirelessly charging a wireless headset from a powered vehicle receptacle that includes a receptacle electrical contact coupled to a vehicle power supply, comprising:

a wireless charging adapter dimensioned for insertion into the powered vehicle receptacle, including

an adapter electrical contact to receive vehicle power when the charging adapter is inserted into the powered vehicle receptacle,

a charging space dimensioned to receive the wireless headset,

transmit circuitry coupled to the adapter electrical contact and including a transmit coil, operable to inductively transmit wireless power through the transmit coil into the charging space, the transmit circuitry including a DC-DC converter to convert a direct current (DC) input voltage received through the adapter electrical contact into a DC charging voltage to power the transmit circuitry,

an internal power supply to store power, and

switch circuitry to

selectively couple the transmit circuitry and the internal power supply to receive power from the adapter electrical contact, when the charging adapter is inserted into the powered vehicle receptacle, and

selectively couple the transmit circuitry to receive power from the internal power supply, when the charging adapter is not inserted into the powered vehicle receptacle.