# US 11,909,220 B2 · Wireless power Tx to Tx conflict and protection

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- Number: US 11,909,220 B2
- Document ID: US11909220B2
- Status: Granted
- Kind: B2
- Application number: 16/709,699
- Filed: 2019-12-10
- Published: 2021-06-10
- Granted: 2024-02-20
- Earliest claimed: 2019-12-10
- Assignees: Integrated Device Technology, Inc.
- Applicants: Integrated Device Technology, Inc.
- Inventors: Nicholaus Smith; Chan Young Jeong; Detelin Martchovsky; Ashley DeWolfe; Damla Acar
- Web page: https://patentgrep.com/patent/US11909220B2

## CPC

- H02J 50/10: using inductive coupling
- H02J 50/70: involving the reduction of electric, magnetic or electromagnetic leakage fields
- H02J 50/80: involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
- H02J 50/90: involving detection or optimisation of position, e.g. alignment
- H02J 7/02: for charging batteries from AC mains by converters
- H02J 50/40: using two or more transmitting or receiving devices (H02J50/50 takes precedence)
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY

## Abstract

A wireless power device is presented that avoids transmit conflicts. The device can include a rectifier circuit coupled to a coil; a transmit driver coupled to the rectifier circuit; a transmit detect circuit configured to detect receipt of transmitted wireless power at the coil; and a controller coupled to the transmit driver and the transmit detect circuit, the controller receiving a signal from the transmit detect circuit and providing an alert of the presence of the transmitted wireless power, the controller activating the transmit driver to transmit wireless power in absence of the signal. The wireless device can determine an operating mode and in a transmit mode determine presence of a received power. If received power is detected an alert can be provided and an off state initiated. If transmit power is not detected the transmit driver can be activated.

## Claims

### Claim 1

A wireless power device, comprising:
a rectifier circuit coupled to a coil;
a transmit driver coupled to the rectifier circuit, the transmit driver configured to provide power to the rectifier circuit during wireless power transmission through the coil;
a transmit detect circuit configured to detect receipt of transmitted wireless power from a second wireless power device at the coil, wherein the transmit detect circuit includes discrete diode and demodulation circuitry to provide a rectified signal related to the transmitted wireless power; and
a controller coupled to the transmit driver and the transmit detect circuit, the controller receiving the rectified signal from the transmit detect circuit and providing an alert of the presence of the transmitted wireless power from the second wireless power device, the controller activating the transmit driver to transmit wireless power in the absence of the rectified signal indicating the presence of the transmitted wireless power and asserting a collision alert in the presence of the rectified signal indicating the presence of the transmitted wireless power.

### Claim 2 (depends on 1)

The device of claim 1, further including
a receive driver coupled to the rectifier circuit; and
a DC circuit coupled to receive and process a voltage from the rectifier circuit when the receive driver is activated by the controller.

### Claim 3 (depends on 1)

The device of claim 1, wherein the controller executes instructions to
determine an operating mode of the device;
when the operating mode is a transmit mode,
determine presence of a transmit power,
when the transmit power is detected provide an alert and proceed to an off state, and
when the transmit power is not detected, transmit wireless power; and
when the operating mode is an off mode, proceeding to the off state.

### Claim 4 (depends on 3)

The device of claim 3, further including
a receive driver coupled to the rectifier circuit; and
a DC circuit coupled to receive and process a voltage from the rectifier circuit when the receiver driver is activated by the controller, and
wherein when the operating mode is a receive mode, receive wireless power by activating the receiver driver.

### Claim 5 (depends on 4)

The device of claim 4, wherein in receive mode the controller transitions to the off state when charging is finished.

### Claim 6

A method of operating a wireless power device, comprising:
determining an operating mode of the wireless power device;
in a transmit mode
determining presence of a transmit power from a second wireless power device,
when the transmit power from the second wireless power device is detected, providing a collision alert and proceeding to an off state where the wireless power device does not transmit wireless power, and
when transmit power from the second wireless power device is not detected, activating a transmit driver to transmit wireless power from the wireless power device,
wherein determining presence of a transmit power includes monitoring a rectified voltage using discrete diode and demodulation circuitry to provide the collision alert.

### Claim 7 (depends on 6)

The method of claim 6, further including
in an off state, deactivating the transmit driver.

### Claim 8 (depends on 6)

The method of claim 6, further including
in a receive state, activating a receive driver.

### Claim 9

A method of operating a wireless power device, comprising:
determining an operating mode of the wireless power device;
in a transmit mode
determining presence of a transmit power from a second wireless power device,
when the transmit power from the second wireless power device is detected, providing a collision alert and proceeding to an off state, and
when the transmit power from the second wireless power device is not detected, activating a transmit driver to transmit wireless power from the wireless power device,
wherein determining presence of a transmit power includes monitoring a frequency of a voltage across a wireless coil with a frequency counter.

### Claim 10

A wireless power device, comprising:
a rectifier circuit coupled to a coil;
a transmit driver coupled to the rectifier circuit, the transmit driver configured to provide power to the rectifier circuit during wireless power transmission through the coil;
a transmit detect circuit configured to detect receipt of transmitted wireless power from a second wireless power device at the coil, wherein the transmit detect circuit detects receipt of transmitted wireless power with a frequency counter coupled to detect incoming voltage or current at the coil to provide a signal; and
a controller coupled to the transmit driver and the transmit detect circuit, the controller receiving the signal from the transmit detect circuit and providing an alert of the presence of the transmitted wireless power, the controller activating the transmit driver to transmit wireless power in absence of the signal and a collision alert in the presence of the signal.

### Claim 11 (depends on 10)

The device of claim 10, further including
a receive driver coupled to the rectifier circuit; and
a DC circuit coupled to receive and process a voltage from the rectifier circuit when the receive driver is activated by the controller.

### Claim 12 (depends on 10)

The device of claim 10, wherein the controller executes instructions to
determine an operating mode of the device;
when the operating mode is a transmit mode,
determine presence of a transmit power,
when the transmit power is detected provide an alert and proceed to an off state, and
when the transmit power is not detected, transmit wireless power; and
when the operating mode is an off mode, proceeding to the off state.

### Claim 13 (depends on 12)

The device of claim 12, further including
a receive driver coupled to the rectifier circuit; and
a DC circuit coupled to receive and process a voltage from the rectifier circuit when the receiver driver is activated by the controller, and
wherein when the operating mode is a receive mode, receive wireless power by activating the receiver driver.

### Claim 14 (depends on 13)

The device of claim 13, wherein in receive mode the controller transitions to the off state when charging is finished.