WIRELESS TRANSCEIVER CIRCUIT, WIRELESS POWER TRANSMISSION CIRCUIT, WIRELESS POWER RECEPTION CIRCUIT, AND WIRELESS POWER TRANSMISSION/RECEPTION SYSTEM INCLUDING THE SAME

• US 20150035374A1
• Filed: 01/03/2014
• Published: 02/05/2015
• Est. Priority Date: 08/01/2013
• Status: Active Grant

• Current Assignee: Foundation of Soongsil University-Industry Cooperation, SK Hynix Inc.
• Original Assignee: Foundation of Soongsil University-Industry Cooperation, SK Hynix Inc.
• Inventors: LEE, Chang-Hyun, PARK, Chang-Kun, YOON, Suk-Hyeon, CHO, Hyung-Jun, CHOI, Jun-Gi, YOO, Jin-Ho
• Granted Patent: US 9,509,375 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H04B 1/40 Circuits
• CPC Class Codes: H04B 5/24 Inductive coupling
• CPC Class Codes: H04B 5/266 One coil at each side, e.g. with primary and secondary coils
• CPC Class Codes: H04B 5/48 Transceivers
• CPC Class Codes: H04B 5/72 for local intradevice communication
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer
• CPC Class Codes: H04H 40/18 Arrangements characterised by circuits or components specially adapted for receiving
• CPC Class Codes: H04Q 3/00 Selecting arrangements H04Q5/00 - H04Q11/00 take precedence

Abstract

A wireless power transmission/reception system includes a wireless power transmission circuit and a wireless power reception circuit. The wireless power transmission circuit includes an oscillator, a DC-AC converter that converts a direct current to an alternating current and is turned on/off in response to a control signal, a power transmission coil that transmits AC power, a signal reception coil, and a signal receiver that transfers the control signal to the DC-AC converter. The wireless power reception circuit includes a power reception coil, a rectifier that converts an alternating current to a direct current and is turned on or off in response to the control signal, an control signal generator that generates the control signal, a signal transmission coil, and a signal transmitter that transmits the control signal through the signal transmission coil.

Claims

1. A wireless transceiver circuit comprising:

a coil having a first terminal and a second terminal; and

a transmission circuit coupled to the first and second terminals,

wherein the transmission circuit is configured to;

when a first transmission operation is performed, supply a current in a direction from the first terminal to the second terminal;

when a second transmission operation is performed, supply a current in a direction from the second terminal to the first terminal; and

when a reception operation is performed, supply a bias voltage to the first and second terminals.

2. The wireless transceiver circuit of claim 1, wherein the transmission circuit comprises:

a first pull-up driver configured to source a current to the first terminal;

a first pull-down driver configured to sink a current from the first terminal;

a second pull-up driver configured to source a current to the second terminal;

a second pull-down driver configured to sink a current from the second terminal; and

a controller, wherein the controller is configured to;

when the first transmission operation is performed, activate the first pull-up driver and the second pull-down driver;

when the second transmission operation is performed, activate the second pull-up driver and the first pull-down driver; and

when the reception operation is performed, activate the first pull-up driver, the first pull-down driver, the second pull-up driver, and the second pull-down driver.

3. The wireless transceiver circuit of claim 1, further comprising:

a reception circuit configured to detect a voltage change across the first terminal and the second terminal, and to restore reception data according to the voltage change.

4. The wireless transceiver circuit of claim 1, wherein the first or second transmission operation is performed when a logic level of a signal to be transmitted changes.

5. The wireless transceiver circuit of claim 2, wherein:

the first pull-up driver includes a first PMOS transistor for supplying a high voltage to the first terminal in response to a first pull-up driving signal;

the first pull-down driver includes a first NMOS transistor for supplying a low voltage to the first terminal in response to a first pull-down driving signal;

the second pull-up driver includes a second PMOS transistor for supplying the high voltage to the second terminal in response to a second pull-up driving signal; and

the second pull-down driver includes a second NMOS transistor for supplying the low voltage to the second terminal in response to a second pull-down driving signal.

6. The wireless transceiver circuit of claim 3, wherein the reception circuit comprises:

a differential amplifier configured to amplify a voltage difference between the first terminal and the second terminal; and

a differential latch configured to restore the reception data based on signals of positive and negative output terminals of the differential amplifier.

7. The wireless transceiver circuit of claim 3, wherein the reception circuit comprises:

a differential latch configured to latch voltage changes of the first terminal and the second terminal to restore the reception data.

8. The wireless transceiver circuit of claim 7, wherein the reception circuit further comprises:

a differential amplifier configured to amplify the reception data based on a voltage difference between positive and negative output terminals of the differential latch.

9. A wireless power transmission circuit comprising:

an oscillator;

a DC-AC converter configured to convert a direct current into an alternating current in response to a periodic wave generated by the oscillator and to be turned on or off in response to a control signal;

a power transmission coil configured to transmit AC power converted by the DC-AC converter;

a signal reception coil; and

a signal receiver configured to detect a voltage change across a first terminal and a second terminal of the signal reception coil and provide the control signal based on the detected voltage change.

10. The wireless power transmission circuit of claim 9, wherein the DC-AC converter comprises:

a first pull-down driver configured to pull-down drive a first terminal of the power transmission coil when the periodic wave is in a first state;

a second pull-down driver configured to pull-down drive a second terminal of the power transmission coil when the periodic wave is in a second state; and

a switch configured to supply a high voltage to a center terminal of in response to the control signal, the center terminal being electrically coupled to the power transmission coil between the first terminal and the second terminal.

11. The wireless power transmission circuit of claim 9, wherein the DC-AC converter comprises:

a first transistor configured to electrically couple a first terminal of the power transmission coil to a first node in response to a bias voltage;

a second transistor configured to electrically couple a second terminal of the power transmission coil to a second node in response to the bias voltage;

a switch configured to supply a high voltage to a center terminal in response to the control signal, the center terminal being electrically coupled to the power transmission coil between the first terminal and the second terminal;

a first pull-down driver configured to pull-down drive the first node when the periodic wave is in a first state; and

a second pull-down driver configured to pull-down drive the second node when the periodic wave is in a second state.

12. The wireless power transmission circuit of claim 11, wherein the DC-AC converter further comprises:

a third pull-down driver configured to pull-down drive the first node in response to a voltage level of the second node; and

a fourth pull-down driver configured to pull-down drive the second node in response to a voltage level of the first node.

13. The wireless power transmission circuit of claim 12, wherein the switch is a PMOS transistor, the first transistor and the second transistor are NMOS transistors, and the first through fourth pull-down drivers are NMOS transistors.

14. The wireless power transmission circuit of claim 9, wherein the DC-AC converter comprises:

a first transistor configured to electrically couple a first terminal of the power transmission coil to a first node in response to a bias voltage;

a second transistor configured to electrically couple a second terminal of the power transmission coil to a second node in response to the bias voltage;

a high voltage terminal configured to supply a high voltage to a center terminal, the center terminal being electrically coupled to the power transmission coil between the first terminal and the second terminal;

a bias voltage generator configured to generate the bias voltage in response to the control signal;

a first pull-down driver configured to pull-down drive the first node when the periodic wave is in a first state; and

a second pull-down driver configured to pull-down drive the second node when the periodic wave is in a second state.

15. The wireless power transmission circuit of claim 14, wherein the DC-AC converter further comprises:

a third pull-down driver configured to pull-down drive the first node in response to a voltage level of the second node; and

a fourth pull-down driver configured to pull-down drive the second node in response to a voltage level of the first node.

16. A wireless power transmission/reception system comprising:

a wireless power transmission circuit comprising;

an oscillator;

a DC-AC converter configured to convert a direct current into an alternating current in response to a periodic wave generated by the oscillator and to be turned on or off in response to a control signal;

a power transmission coil configured to transmit AC power converted by the DC-AC converter;

a signal reception coil; and

a signal receiver configured to detect a voltage change across the signal reception coil and provide the control signal based on the detected voltage change; and

a wireless power reception circuit comprising;

a power reception coil;

a rectifier configured to convert an alternating current received through the power reception coil into a direct current and to be turned on or off in response to the control signal;

a control signal generator configured to generate the control signal indicating whether a level of a direct voltage converted by the rectifier is higher than a reference voltage;

a signal transmission coil; and

a signal transmitter configured to transmit the control signal through the signal transmission coil.

17. The wireless power transmission/reception system of claim 16, wherein the power transmission coil is inductively coupled to the power reception coil, and the signal reception coil is inductively coupled to the signal transmission coil.

18. The wireless power transmission/reception system of claim 16, wherein the wireless power transmission circuit and the wireless power reception circuit are provided to apparatuses separate from each other.

19. The wireless power transmission/reception system of claim 18, wherein the wireless power transmission circuit is provided to test equipment and the wireless power reception circuit is provided to a chip to be tested.

20. The wireless power transmission/reception system of claim 16, wherein the DC-AC converter comprises:

a first pull-down driver configured to pull-down drive a first terminal of the power transmission coil when the periodic wave is in a first state;

a second pull-down driver configured to pull-down drive a second terminal of the power transmission coil when the periodic wave is in a second state; and

a switch configured to supply a high voltage to a center terminal in response to the control signal, the center terminal being electrically coupled to the power transmission coil between the first terminal and the second terminal.