Wireless transceiver circuit with reduced area

• US 9,509,375 B2
• Filed: 01/03/2014
• Issued: 11/29/2016
• 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: Park, Chang-Kun, Yoon, Suk-Hyeon, Cho, Hyung-Jun, Choi, Jun-Gi, Yoo, Jin-Ho, Lee, Chang-Hyun
• Primary Examiner(s): Amrany, Adi
• Application Number:
  US14/147,421
• Publication Number:
  US 20150035374A1
• Time in Patent Office: 1,061 Days
• Field of Search: 307/115
• US Class Current: 1/1
• 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 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 a first transmission operation is performed, activate the first pull-up driver and the second pull-down driver;

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

when a 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 to supply a bias voltage to the first and second terminals.

2. 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.

3. The wireless transceiver circuit of claim 2, 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.

4. The wireless transceiver circuit of claim 2, 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.

5. The wireless transceiver circuit of claim 4, 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.

6. 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.

7. The wireless transceiver circuit of claim 1, 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.