WIRELESS POWER RECEIVING DEVICE, AND WIRELESS POWER TRANSMISSION DEVICE

• US 20150001956A1
• Filed: 06/26/2014
• Published: 01/01/2015
• Est. Priority Date: 06/27/2013
• Status: Active Grant

• Current Assignee: TDK Corporation
• Original Assignee: TDK Corporation
• Inventors: OHNISHI, Masahide, SAEN, Tsunehiro, MIYAZAWA, Ryo
• Granted Patent: US 9,966,999 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H02J 1/002 Intermediate AC, e.g. DC supply with intermediated AC distribution
• CPC Class Codes: H02J 1/04 Constant-current supply systems
• 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 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/0029 with safety or protection devices or circuits
• CPC Class Codes: H04B 5/24 Inductive coupling
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

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.

Claims

1. A wireless power receiving device that wirelessly receive power, the wireless power feeding device comprising:

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 means that detects an output voltage value or an output current value from the rectifier unit; and

switching means that short-circuits one of 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 1,

wherein no capacitor connected in series or in parallel to the power receiving coil is provided.

4. 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.

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. 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.

7. 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.

8. 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.

9. A wireless power transmission device comprising:

the wireless power receiving device according to claim 6, 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 7,

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. The wireless power transmission device according to claim 8,

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.

12. 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.