Wireless power transmitting apparatus having signal detecting circuit for detecting transmission signals

• US 9,246,358 B2
• Filed: 12/21/2012
• Issued: 01/26/2016
• Est. Priority Date: 12/21/2011
• Status: Active Grant

• Current Assignee: GE Hybrid Technologies, LLC
• Original Assignee: Hanrim Postech Co., Ltd.
• Inventors: Jung, Chun-Kil, Shon, Soo-Dong
• Primary Examiner(s): Levin, Naum B
• Application Number:
  US13/723,980
• Publication Number:
  US 20130162204A1
• Time in Patent Office: 1,131 Days
• US Class Current: 1/1
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: H04B 5/266 One coil at each side, e.g. with primary and secondary coils
• CPC Class Codes: H04B 5/72 for local intradevice communication
• CPC Class Codes: H04B 5/77 for interrogation
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

Disclosed herein are a signal detecting apparatus and a wireless power transmitting apparatus having the same. In the signal detecting apparatus, a resonance tank circuit is resonated by a magnetic field change of a power transmitting coil generated according to a signal transmitted to the wireless power transmitting apparatus by a power receiving apparatus to generate a resonance signal, and a signal extracting unit extracts the signal transmitted by the power receiving apparatus in the generated resonance signal. The resonance tank circuit includes a radio frequency identification (RFID) transponder detecting the magnetic field change signal of the power transmitting coil, and a capacitor connected in parallel with the RFID transponder to be resonated by the magnetic field change of the power transmitting coil. The signal transmitted to the wireless power transmitting apparatus by the power receiving apparatus may be accurately detected by a simple circuit configuration.

Claims

1. A wireless power transmitting apparatus comprising:

a power transmitting coil configured to wirelessly transmit a power to a power receiving apparatus;

a signal detecting apparatus configured to detect a transmission signal including a unique ID signal and a power charging information signal, transmitted by the power receiving apparatus, by using a magnetic field change of the power transmitting coil according to the transmission signal;

a power transmitting controlling unit configured to control that the power is wirelessly transmitted to the power receiving apparatus and judges a charged state of the power receiving apparatus using the transmission signal detected by the signal detecting apparatus;

a driving driver configured to generate a driving signal under the control of the power transmitting controlling unit; and

a series resonant converter configured to switch a direct current (DC) power according to the driving signal and output the switched power to the power transmitting coil,

wherein the signal detecting apparatus comprises;

a magnetic field change signal detecting unit configured to detect the magnetic field change signal of the power transmitting coil which is generated according to the transmission signal; and

a signal extracting unit configured to extract the transmission signal transmitted by the power receiving apparatus from the magnetic field change signal detected by the magnetic field change signal detecting unit,

wherein the magnetic field change signal detecting unit comprises a resonance tank circuit resonated by the magnetic field change signal of the power transmitting coil to generate a resonance signal,

wherein the resonance tank circuit comprises;

an RFID transponder configured to detect the magnetic field change signal of the power transmitting coil; and

a capacitor connected in parallel with the RFID transponder to allow resonance to be generated by the magnetic field change signal of the power transmitting coil.

2. The wireless power transmitting apparatus of claim 1, further comprising at least one additional power transmitting coil.

3. The wireless power transmitting apparatus of claim 1, further comprising an AC/DC converter configured to convert an AC power into a DC power and supply the DC power as an operation power to the wireless power transmitting apparatus.

4. The wireless power transmitting apparatus of claim 3, wherein the AC/DC converter is integrated with the wireless power transmitting apparatus.

5. The wireless power transmitting apparatus of claim 1, wherein the signal extracting unit comprises:

an envelope detecting unit configured to detect an envelope of the magnetic field change signal;

a low pass filter configured to filter the envelope detected by the envelope detecting unit; and

a comparator configured to compare an output signal of the low pass filter with a preset reference voltage to extract the transmission signal.

6. The wireless power transmitting apparatus of claim 5, wherein the signal extracting unit further comprises an amplifier disposed between the low pass filter and the comparator and configured to amplify the output signal of the low pass filter and output the amplified signal to the comparator.

7. The wireless power transmitting apparatus of claim 1, wherein the transmission signal comprises:

a unique ID signal of the power receiving apparatus; and

a power charging information signal of the battery cell module.