Wireless power receiving device and wireless power transmission device

• US 10,298,069 B2
• Filed: 03/30/2016
• Issued: 05/21/2019
• Est. Priority Date: 03/31/2015
• Status: Active Grant

• Current Assignee: TDK Corporation
• Original Assignee: TDK Corporation
• Inventors: Arasaki, Kota, Ohnishi, Masahide
• Primary Examiner(s): Fleming, Fritz M
• Application Number:
  US15/559,173
• Publication Number:
  US 20180090995A1
• Time in Patent Office: 1,147 Days
• CPC Class Codes: B60L 53/12 Inductive energy transfer
• CPC Class Codes: B60L 53/122 Circuits or methods for driving the primary coil, e.g. supplying electric power to the coil
• CPC Class Codes: H02H 9/041 using a short-circuiting device
• 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: H02M 3/33576 having at least one active switching element at the secondary side of an isolation transformer
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

A wireless power receiving device, for wirelessly receiving electric power from a wireless power feeding device, includes: a power receiving side resonant circuit having a power receiving coil wirelessly receiving power from a power feeding side and a power receiving side resonant capacitor; a rectifier circuit in which the power received by the power receiving coil is rectified to be output to a load; a power receiving side voltage detecting portion for detecting the output voltage of the rectifier circuit; a short circuit having a switching element connected between an output portion of the power receiving side resonant circuit and an output portion of the rectifier circuit, and a rectifying element inserted between the output portion of the power receiving side resonant circuit and the switching element; and a controlling circuit which operates the switching element when a value of the output voltage exceeds a preset reference voltage value.

Claims

1. A wireless power receiving device, for wirelessly receiving electric power from a wireless power feeding device, comprising:

a power receiving side resonant circuit provided with a power receiving coil wirelessly receiving electric power from a power feeding side and a power receiving side resonant capacitor connected to the power receiving coil;

a rectifier circuit in which the electric power received by the power receiving coil is rectified to be output to a load;

a power receiving side voltage detecting portion for detecting an output voltage of the rectifier circuit;

a short circuit provided with a switching element connected between an output portion of the power receiving side resonant circuit and an output portion of the rectifier circuit, and a rectifying element inserted between the output portion of the power receiving side resonant circuit and the switching element; and

a controlling circuit which operates the switching element when a value of the output voltage detected by the power receiving side voltage detecting portion exceeds a preset reference voltage value.

2. The wireless power receiving device of claim 1, wherein,

the rectifier circuit is provided with a bridge type circuit in which four diodes are full bridge connected and a smoothing capacitor which is connected in parallel with the bridge type circuit.

3. The wireless power receiving device of claim 2, wherein,

an inductor circuit is further provided between the output portion of the power receiving side resonant circuit and an input portion of the rectifier circuit.

4. The wireless power receiving device of claim 2, wherein,

the controlling circuit transmits a stop signal for stopping a power feeding operation to the wireless power feeding device at the same time as or immediately after the controlling circuit operates the switching element.

5. The wireless power receiving device of claim 4, wherein,

a transforming circuit is further provided between the output portion of the power receiving side resonant circuit and an input portion of the rectifier circuit.

6. The wireless power receiving device of claim 5, wherein,

an inductor circuit is further provided between the output portion of the power receiving side resonant circuit and an input portion of the rectifier circuit.

7. The wireless power receiving device of claim 4, wherein,

an inductor circuit is further provided between the output portion of the power receiving side resonant circuit and an input portion of the rectifier circuit.

8. The wireless power receiving device of claim 2, wherein,

a transforming circuit is further provided between the output portion of the power receiving side resonant circuit and an input portion of the rectifier circuit.

9. The wireless power receiving device of claim 8, wherein,

an inductor circuit is further provided between the output portion of the power receiving side resonant circuit and an input portion of the rectifier circuit.

10. The wireless power receiving device of claim 1, wherein,

the controlling circuit transmits a stop signal for stopping a power feeding operation to the wireless power feeding device at the same time as or immediately after the controlling circuit operates the switching element.

11. The wireless power receiving device of claim 10, wherein,

a transforming circuit is further provided between the output portion of the power receiving side resonant circuit and an input portion of the rectifier circuit.

12. The wireless power receiving device of claim 11, wherein,

an inductor circuit is further provided between the output portion of the power receiving side resonant circuit and an input portion of the rectifier circuit.

13. The wireless power receiving device of claim 10, wherein,

an inductor circuit is further provided between the output portion of the power receiving side resonant circuit and an input portion of the rectifier circuit.

14. The wireless power receiving device of claim 1, wherein,

a transforming circuit is further provided between the output portion of the power receiving side resonant circuit and an input portion of the rectifier circuit.

15. The wireless power receiving device of claim 14, wherein,

an inductor circuit is further provided between the output portion of the power receiving side resonant circuit and an input portion of the rectifier circuit.

16. The wireless power receiving device of claim 1, wherein,

an inductor circuit is further provided between the output portion of the power receiving side resonant circuit and an input portion of the rectifier circuit.

17. A wireless power transmission device comprising the wireless power receiving device of claim 1 and a wireless power feeding device, wherein,

the wireless power feeding device is provided with a power feeding side resonant circuit and a power inverter circuit, wherein, the power feeding side resonant circuit comprises a power feeding coil for wirelessly feeding power to power receiving side and a power feeding side resonant capacitor connected to the power feeding coil, and

the power inverter circuit inverts an input direct current power into an alternating current power and then provides to the power feeding coil.