Wireless power receiving device having a short-circuiting switch, and wireless power transmission device

Patent metadata

Field	Value
Publication number	US-9966999-B2
Application number	US-201414315671-A
Country	US
Kind code	B2
Filing date	Jun 26, 2014
Priority date	Jun 27, 2013
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

To provide a wireless power receiving device, and a wireless power transmission device capable of improving the reliability of a protection circuit while preventing breakage of a circuit element upon occurrence of any abnormality, such as overvoltage or overcurrent. A wireless power receiving device includes a power receiving coil; a rectifier unit that performs full-wave rectification of the power received by the power receiving coil and supplies the power to a load; power-receiving-side detecting unit that detects an output voltage value or an output current value from the rectifier unit; and switching unit that short-circuits one of two current paths through the rectifier unit if the value detected by the power-receiving-side detecting unit exceeds a predetermined reference value.

First claim

What is claimed is:

1. A wireless power receiving device that wirelessly receives power, the wireless power receiving device comprising:
a power receiving unit that includes a power receiving coil;
a rectifier unit that performs full-wave rectification of the power received by the power receiving coil and supplies the power to a load, the rectifier unit including two current paths there-through;
power-receiving-side detecting means that detects an output voltage value or an output current value from the rectifier unit; and
switching means that short-circuits, in the rectifier unit, only one of the two current paths through the rectifier unit if the value detected by the power-receiving-side detecting means exceeds a predetermined reference value.

2. The wireless power receiving device according to claim 1 ,
wherein the rectifier unit includes a bridge circuit in which four diodes are bridge-connected to each other and a smoothing capacitor connected in parallel to the bridge circuit, and
wherein the switching means is composed of a switching element connected in parallel to one diode, among the four diodes in the bridge circuit.

3. The wireless power receiving device according to claim 2 ,
wherein no capacitor connected in series or in parallel to the power receiving coil is provided within the power receiving unit.

4. A wireless power transmission device comprising:
the wireless power receiving device according to claim 3 , and
a wireless power feeding device,
wherein the wireless power feeding device includes
a power feeding coil;
a power conversion circuit that converts direct current power that is input to alternating current power and supplies the alternating current power to the power feeding coil;
power-feeding-side detecting means that detects an output current value from the power conversion circuit; and
power-feeding operation controlling means that controls a power feeding operation of the wireless power feeding device, and

wherein, if the value detected by the power-feeding-side detecting means exceeds a predetermined reference value, the power-feeding operation controlling means performs an intermittent control action in which start and stop of the power feeding operation of the wireless power feeding device are repeated.

5. The wireless power transmission device according to claim 4 ,
wherein the wireless power receiving device further includes transmitting means that transmits a signal indicating an abnormal state to the wireless power feeding device if the value detected by the power-receiving-side detecting means exceeds the predetermined reference value, and
wherein, if the value detected by the power-feeding-side detecting means exceeds the predetermined reference value and the signal indicating the abnormal state is received from the transmitting means, the power-feeding operation controlling means stops the power feeding operation of the wireless power feeding device.

6. A wireless power transmission device comprising:
the wireless power receiving device according to claim 2 , and
a wireless power feeding device,
wherein the wireless power feeding device includes
a power feeding coil;
a power conversion circuit that converts direct current power that is input to alternating current power and supplies the alternating current power to the power feeding coil;
power-feeding-side detecting means that detects an output current value from the power conversion circuit; and
power-feeding operation controlling means that controls a power feeding operation of the wireless power feeding device, and

wherein, if the value detected by the power-feeding-side detecting means exceeds a predetermined reference value, the power-feeding operation controlling means performs an intermittent control action in which start and stop of the power feeding operation of the wireless power feeding device are repeated.

7. The wireless power transmission device according to claim 6 ,
wherein the wireless power receiving device further includes transmitting means that transmits a signal indicating an abnormal state to the wireless power feeding device if the value detected by the power-receiving-side detecting means exceeds the predetermined reference value, and
wherein, if the value detected by the power-feeding-side detecting means exceeds the predetermined reference value and the signal indicating the abnormal state is received from the transmitting means, the power-feeding operation controlling means stops the power feeding operation of the wireless power feeding device.

8. The wireless power receiving device according to claim 1 ,
wherein no capacitor connected in series or in parallel to the power receiving coil is provided within the power receiving unit.

9. A wireless power transmission device comprising:
the wireless power receiving device according to claim 8 , and
a wireless power feeding device,
wherein the wireless power feeding device includes
a power feeding coil;
a power conversion circuit that converts direct current power that is input to alternating current power and supplies the alternating current power to the power feeding coil;
power-feeding-side detecting means that detects an output current value from the power conversion circuit; and
power-feeding operation controlling means that controls a power feeding operation of the wireless power feeding device, and

wherein, if the value detected by the power-feeding-side detecting means exceeds a predetermined reference value, the power-feeding operation controlling means performs an intermittent control action in which start and stop of the power feeding operation of the wireless power feeding device are repeated.

10. The wireless power transmission device according to claim 9 ,
wherein the wireless power receiving device further includes transmitting means that transmits a signal indicating an abnormal state to the wireless power feeding device if the value detected by the power-receiving-side detecting means exceeds the predetermined reference value, and
wherein, if the value detected by the power-feeding-side detecting means exceeds the predetermined reference value and the signal indicating the abnormal state is received from the transmitting means, the power-feeding operation controlling means stops the power feeding operation of the wireless power feeding device.

11. A wireless power transmission device comprising:
the wireless power receiving device according to claim 1 , and
a wireless power feeding device,
wherein the wireless power feeding device includes
a power feeding coil;
a power conversion circuit that converts direct current power that is input to alternating current power and supplies the alternating current power to the power feeding coil;
power-feeding-side detecting means that detects an output current value from the power conversion circuit; and
power-feeding operation controlling means that controls a power feeding operation of the wireless power feeding device, and

wherein, if the value detected by the power-feeding-side detecting means exceeds a predetermined reference value, the power-feeding operation controlling means performs an intermittent control action in which start and stop of the power feeding operation of the wireless power feeding device are repeated.

12. The wireless power transmission device according to claim 11 ,
wherein the wireless power receiving device further includes transmitting means that transmits a signal indicating an abnormal state to the wireless power feeding device if the value detected by the power-receiving-side detecting means exceeds the predetermined reference value, and
wherein, if the

Assignees

• Tdk Corp

Inventors

• Saen Tsunehiro
• Ohnishi Masahide
• Miyazawa Ryo

Classifications

• H02J1/002

  using intermediate DC-AC-DC conversion · CPC title

• H02J7/60

  including safety or protection arrangements · CPC title

• H02J1/04

  Current-controlled supply systems, e.g. constant-current supply systems · CPC title

• H02J50/12

  of the resonant type · CPC title

• H02J7/025

  Electricity · mapped topic