Power-supplying device and wireless power supply system

• US 10,298,063 B2
• Filed: 07/22/2015
• Issued: 05/21/2019
• Est. Priority Date: 03/18/2013
• Status: Active Grant

• Current Assignee: IHI Corporation
• Original Assignee: IHI Corporation
• Inventors: Murayama, Takahiko
• Primary Examiner(s): Borroto, Alfonso Perez
• Application Number:
  US14/805,729
• Publication Number:
  US 20150326035A1
• Time in Patent Office: 1,399 Days
• 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 7/0016 using shunting, discharge or bypass circuits

Abstract

A wireless power supply device and a wireless power supply system of the present disclosure include a rectifier circuit to be connected to a commercial power source, a conversion unit which is connected to the rectifier circuit, a resonance circuit which is connected to the conversion unit and transmits power toward a power-receiving device wirelessly, a communication unit which receives, from the power-receiving device, information relating to power supply to a load supplied with power, and a control unit which is connected to the communication unit and the conversion unit and controls the conversion unit based on the information so that the value of power supply impedance of the load falls within a predetermined range.

Claims

1. A wireless power supply device comprising:

a rectifier circuit to be connected to a commercial power source;

a conversion unit which is connected to the rectifier circuit;

a resonance circuit which is connected to the conversion unit and transmits power toward a power-receiving device wirelessly;

a communication unit which receives, from the power-receiving device, information relating to power supply to a load supplied with power; and

a control unit which is connected to the communication unit and the conversion unit, and controls, in accordance with an order of a first control period in which a power supply impedance control functions with priority over a constant power control, a second control period in which the power supply impedance control and the constant power control both function, and a third control period in which the power supply impedance control functions with priority over the constant power control, the conversion unit based on the information such that a value of power supply impedance of the load falls within a predetermined range.

2. The wireless power supply device according to claim 1,

wherein the conversion unit includes a chopper circuit connected to the rectifier circuit, and

the control unit adjusts a duty ratio of a pulse signal output to the chopper circuit based on the information.

3. The wireless power supply device according to claim 2,

wherein the conversion unit includes an inverter circuit connected to the chopper circuit, and

the control unit adjusts a duty ratio of a pulse signal output to the inverter circuit or a phase difference between respective phases of the pulse signal based on the information.

4. The wireless power supply device according to claim 1,

wherein the communication unit acquires a voltage and a current relating to the load from the power-receiving device as the information.

5. The wireless power supply device according to claim 1,

wherein the communication unit acquires the power supply impedance from the power-receiving device as the information.

6. The wireless power supply device according to claim 1,

wherein the communication unit receives a charging voltage and a charging current of a battery which is the load from the power-receiving device as the information.

7. The wireless power supply device according to claim 6,

wherein the control unit calculates the power supply impedance based on the charging voltage and the charging current, and controls the conversion unit based on the calculated power supply impedance so that the value of the power supply impedance falls within the predetermined range.

8. The wireless power supply device according to claim 6,

wherein the control unit controls the conversion unit so that the power supply impedance is a lower limit value of the predetermined range in a first period, increases from the lower limit value within the predetermined range in a second period subsequent to the first period, and is an upper limit value of the predetermined range in a third period subsequent to the second period.

9. The wireless power supply device according to claim 8,

wherein the control unit controls the conversion unit so that the power supplied to the battery is constant in the second period.

10. The wireless power supply device according to claim 8,

wherein the control unit controls the conversion unit so that the charging current of the battery is constant in the second period.

11. The wireless power supply device according to claim 6,

wherein the control unit controls the conversion unit so that the power supply impedance is a constant value within the predetermined range.

12. The wireless power supply device according to claim 1,

wherein the control unit controls the conversion unit based on the information such that a value of power supply impedance of the load falls within a predetermined range by functioning a power supply impedance control such that the power supply impedance becomes identical to a lower limit value within the predetermined range in a first period, by functioning both the power supply impedance control and a constant power control such that the power supply impedance increases from the lower limit value toward a value within the predetermined range in a second period subsequent to the first period, and by functioning the power supply impedance control such that the power supply impedance becomes identical to an upper limit value within the predetermined range in a third period subsequent to the second period.

13. A wireless power supply system comprising:

a power-supplying device; and

a power-receiving device;

wherein the power-supplying device comprises;

a first rectifier circuit to be connected to a commercial power source,

a conversion unit which is connected to the rectifier circuit,

a first resonance circuit which is connected to the conversion unit and transmits power wirelessly,

a first communication unit which receives information relating to power supply to a load supplied with power, and

a control unit which is connected to the communication unit and the conversion unit, and controls, in accordance with an order of a first control period in which a power supply impedance control functions with priority over a constant power control, a second control period in which the power supply impedance control and the constant power control both function, and a third control period in which the power supply impedance control functions with priority over the constant power control, the conversion unit based on the information such that a value of power supply impedance of the load falls within a predetermined range; and

wherein the power-receiving device comprises;

a second resonance circuit which receives the power wirelessly,

a second rectifier circuit which is connected to the second resonance circuit,

a measurement unit which measures the information relating to the power supply to the load, and

a second communication unit which is connected to the measurement unit, and outputs the information to the power-supplying device.

14. The wireless power supply system according to claim 13,

wherein the control unit controls the conversion unit based on the information such that a value of power supply impedance of the load falls within a predetermined range by functioning a power supply impedance control such that the power supply impedance becomes identical to a lower limit value within the predetermined range in a first period, by functioning both the power supply impedance control and a constant power control such that the power supply impedance increases from the lower limit value toward a value within the predetermined range in a second period subsequent to the first period, and by functioning the power supply impedance control such that the power supply impedance becomes identical to an upper limit value within the predetermined range in a third period subsequent to the second period.