Non-contact power supply transmitter system and receiving device

Patent metadata

Field	Value
Publication number	US-9253002-B2
Application number	US-201414457235-A
Country	US
Kind code	B2
Filing date	Aug 12, 2014
Priority date	Aug 13, 2013
Publication date	Feb 2, 2016
Grant date	Feb 2, 2016

Abstract

A non-contact power supply transmitter system 100 transmitting an electric power from a transmitting device (TX) 200 to a receiving device (RX) 300 with a non-contact power supply transmitter method, the TX 200 including: a transmitting coil 202 ; a driver 204 causing the transmitting coil to generate a power signal of the electromagnetic field; and an FSK modulation unit 240 transmitting an FSK signal Sf through the transmitting coil, the RX 300 including: a receiving coil 302 ; a rectifier circuit 320 rectifying an electric current induced by the receiving coil; an FSK demodulation unit 340 demodulating the FSK signal received through the receiving coil; and a controller 312 controlling so that a rectifying mode of the rectifier circuit is switched to a diode rectifying mode during the FSK communication. The non-contact power supply transmitter system 100 and the RX 300 can execute a stable FSK communication.

First claim

What is claimed is:

1. A non-contact power supply transmitter system configured to transmit an electric power from a transmitting device to a receiving device with a non-contact power supply transmitter method,
the transmitting device comprising:
a transmitting coil;
a driver configured to cause the transmitting coil to generate a power signal of an electromagnetic field; and
a frequency shift keying (FSK) modulation unit configured to transmit an FSK signal through the transmitting coil,

the receiving device comprising:
a receiving coil;
a rectifier circuit configured to rectify an electric current induced by the receiving coil;
an FSK demodulation unit configured to demodulate the FSK signal received through the receiving coil; and
a controller configured to control so that a rectifying mode of the rectifier circuit is switched to a diode rectifying mode during the FSK communication, wherein

if the controller detects a start of the FSK communication, the controller transmits a start trigger signal for the FSK communication to the transmitting device, and then switches the rectifying mode of the rectifier circuit from a synchronous rectifying mode to the diode rectifying mode.

2. A non-contact power supply transmitter system configured to transmit an electric power from a transmitting device to a receiving device with a non-contact power supply transmitter method,
the transmitting device comprising:
a transmitting coil;
a driver configured to cause the transmitting coil to generate a power signal of an electromagnetic field; and
a frequency shift keying (FSK) modulation unit configured to transmit an FSK signal through the transmitting coil,

the receiving device comprising:
a receiving coil;
a rectifier circuit configured to rectify an electric current induced by the receiving coil;
an FSK demodulation unit configured to demodulate the FSK signal received through the receiving coil; and
a controller configured to control so that a rectifying mode of the rectifier circuit is switched to a diode rectifying mode during the FSK communication, wherein

if the controller detects an end of the FSK communication, the controller transmits an end trigger signal for the FSK communication to the transmitting device, and then switches the rectifying mode of the rectifier circuit from the diode rectifying mode to the synchronous rectifying mode.

3. The non-contact power supply transmitter system according to claim 1 , wherein
if the controller detects an end of the FSK communication, the controller transmits an end trigger signal for the FSK communication to the transmitting device, and then switches the rectifying mode of the rectifier circuit from the diode rectifying mode to the synchronous rectifying mode.

4. The non-contact power supply transmitter system according to claim 1 , wherein
the receiving device further comprises an amplitude modulation (AM) modulator configured to AM-modulate the start trigger signal or the end trigger signal.

5. The non-contact power supply transmitter system according to claim 2 , wherein
the receiving device further comprises an AM modulator configured to AM-modulate the start trigger signal or the end trigger signal.

6. The non-contact power supply transmitter system according to claim 3 , wherein
the receiving device further comprises an AM modulator configured to AM-modulate the start trigger signal or the end trigger signal.

7. The non-contact power supply transmitter system according to claim 1 , wherein
the rectifier circuit is a bridged rectifier circuit configured to rectify the electric current using four rectifier transistors, wherein
the controller switches the rectifying mode of the rectifier circuit by switching ON/OFF of the rectifier transistors.

8. The non-contact power supply transmitter system according to claim 1 , wherein
the FSK communication is executed after an identification & configuration phase between the transmitting device and the receiving device, and before a power transfer phase from the transmitting device to the receiving device.

9. The non-contact power supply transmitter system according to claim 1 , wherein
the receiving device is mounted in any one of a non-contact power transmitter IC, a mobile phone, a tablet-type device, a smart phone, an audio player, or a game machine.

10. A receiving device configured so that an electric power is transmitted from a transmitting device thereto with a non-contact power supply transmitter method, the receiving device comprising:
a receiving coil;
a rectifier circuit configured to rectify an electric current induced by the receiving coil;
a frequency shift keying (FSK) demodulation unit configured to demodulate the FSK signal received through the receiving coil; and
a controller configured to control so that a rectifying mode of the rectifier circuit is switched to a diode rectifying mode during the FSK communication, wherein
if the controller detects a start of the FSK communication, the controller transmits a start trigger signal for the FSK communication to the transmitting device, and then switches the rectifying mode of the rectifier circuit from a synchronous rectifying mode to the diode rectifying mode.

11. A receiving device configured so that an electric power is transmitted from a transmitting device thereto with a non-contact power supply transmitter method, the receiving device comprising:
a receiving coil;
a rectifier circuit configured to rectify an electric current induced by the receiving coil;
a frequency shift keying (FSK) demodulation unit configured to demodulate the FSK signal received through the receiving coil; and
a controller configured to control so that a rectifying mode of the rectifier circuit is switched to a diode rectifying mode during the FSK communication, wherein
if the controller detects an end of the FSK communication, the controller transmits an end trigger signal for the FSK communication to the transmitting device, and then switches the rectifying mode of the rectifier circuit from the diode rectifying mode to the synchronous rectifying mode.

12. The receiving device according to claim 10 , wherein
if the controller detects an end of the FSK communication, the controller transmits an end trigger signal for the FSK communication to the transmitting device, and then switches the rectifying mode of the rectifier circuit from the diode rectifying mode to the synchronous rectifying mode.

13. The receiving device according to claim 10 , further comprising
an amplitude modulation (AM) modulator configured to AM-modulate the start trigger signal or the end trigger signal.

14. The receiving device according to claim 11 , further comprising
an AM modulator configured to AM-modulate the start trigger signal or the end trigger signal.

15. The receiving device according to claim 12 , further comprising
an AM modulator configured to AM-modulate the start trigger signal or the end trigger signal.

16. The receiving device according to claim 10 , wherein
the rectifier circuit is a bridged rectifier circuit configured to rectify the electric current using four rectifier transistors, wherein
the controller switches the rectifying mode of the rectifier circuit by switching ON/OFF of the rectifier transistors.

17. The receiving device according to claim 10 , wherein
the FSK communication is executed after an identification & configuration phase between the transmitting device and the receiving device, and before a power transfer phase from the transmitting device to the receiving device

Assignees

• Rohm Co Ltd

Inventors

• Noguchi Takashi
• Watanabe Masatoshi

Classifications

• H04L27/12 Primary

  Modulator circuits; Transmitter circuits · CPC title

• H04L25/0268

  with modulation and subsequent demodulation · CPC title

• H04L27/14

  Demodulator circuits; Receiver circuits · CPC title