US 9,520,739 B2Granted

Wireless charging circuit, wireless charging system and semiconductor device

AssigneeRenesas Electronics Corporation

InventorsTakefumi Endo, Masanori Kayama

Life of this patent

Estimating the term…

Loading patent…

Abstract

To satisfy the NFC communication standard in wireless charging with a shared antenna, used for NFC communication. A power supply unit includes a voltage step-down circuit 331, a charge control circuit 332, and a communication controller power supply circuit 333. The voltage step-down circuit includes a switching regulator 200, and a selection circuit 206 and 208 which can select an output path PT1 of the switching regulator and a bypass path PT2 of the switching regulator. The voltage step-down circuit includes a selection control circuit 207. The selection control circuit supplies voltage to the communication controller power supply circuit via the bypass path at the time of activating the communication controller. Since the output voltage of the series regulator stabilizes in a shorter time than the switching regulator, it becomes possible to keep the time from when RF power rises to when initial communication becomes possible, within standards.

Claims5

Dependent claims

A wireless communication device comprising:

a communication control circuit configured to transmit and receive control information;
a power control circuit including a first regulator circuit, a second regulator circuit and a selection circuit,
the power control circuit being configured to receive a source voltage, supply a power supply voltage to the communication control circuit and output a charging voltage to a battery,
the first regulator circuit being configured to input the source voltage and output a first voltage to the selection circuit;
the second regulator circuit being configured to input the source voltage and output a second voltage to the selection circuit;
wherein the selection circuit is configured to select and output the first voltage as the power supply voltage when a level of the first voltage reaches a predetermined level, and to select and output the second voltage as the power supply voltage when the level of the first voltage has not reached the predetermined level,
wherein an activation time of the second regulator is faster than that of the first regulator,
wherein the first regulator circuit includes a switching regulator, and
wherein the second regulator circuit includes a series regulator.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/692,093Filed 21 Apr 2015 · continuation
Priority: JP 2012-05450912 Mar 2012
Published: US 2015/0229158 A113 Aug 2015
Granted: 13 Dec 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

H02J 50/20
Circuit arrangements or systems for wireless supply or distribution of electric power: using microwaves or radio frequency waves
G01R 19/0084
Arrangements for measuring currents or voltages or for indicating presence or sign thereof: measuring voltage only
H02J 7/47
Characterised by the exchange of charge or discharge related data: arrangements for checking compatibility or authentication between one…
H02J 50/12
Using inductive coupling: of the resonant type

Family

Application13/782,009Parent of this continuation · filed 1 Mar 2013
US 2015/0229158 A1Pre-grant publication · published 13 Aug 2015
US 9,035,603 B2Parent of this continuation
US 2013/0234658 A1Published application
US 9,520,739 B2This patent

From the US filing history. Foreign family members aren’t listed.

Timeline

Citations

Open elsewhere

Building an agent or pulling many patents? Use the API or MCP server instead of scraping pages. Get an API key