POWER-TRANSMITTING DEVICE AND WIRELESS POWER-SUPPLYING SYSTEM

• US 20160380485A1
• Filed: 09/13/2016
• Published: 12/29/2016
• Est. Priority Date: 05/30/2014
• Status: Active Grant

• Current Assignee: IHI Corporation
• Original Assignee: IHI Corporation
• Inventors: MURAYAMA, Takahiko
• Granted Patent: US 10,277,082 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: H02M 1/32 Means for protecting converters other than automatic disconnection
• CPC Class Codes: H02M 1/4225 using a non-isolated boost converter
• CPC Class Codes: H02M 3/3378 in a push-pull configuration of the parallel type H02M3/3374 takes precedence
• CPC Class Codes: H02M 7/4818 with means for adaptation of resonance frequency, e.g. by modification of capacitance or inductance of resonance circuits
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

When a voltage across an element of a voltage converter or an inverter circuit has reached an upper limit of a withstanding voltage of the element and it is determined that received power of a power-receiving device has not reached a target value, an instruction for changing at least one of inductance and capacitance of an element which is disposed from a receiving-side pad to a filter circuit in the power-receiving device is transmitted from a power-transmitting device to the power-receiving device so as to satisfy a condition that the received power approaches a target value.

Claims

1. A power-transmitting device including a voltage converter that converts a voltage and an inverter circuit that converts power input from the voltage converter into AC power, generating a magnetic field on the basis of the AC power output from the inverter circuit, and supplying power to a power-receiving device that rectifies power which is received by a receiving-side pad via the magnetic field and smoothes the rectified power using a filter circuit, the power-transmitting device comprising:

a communication unit that communicates with the power-receiving device; and

a control unit,

wherein the communication unit receives, from the power-receiving device, information on the power received by the power-receiving device and

wherein the control unit causes the communication unit to transmit an instruction for changing at least one of inductance and capacitance of an element which is disposed from the receiving-side pad to the filter circuit in the power-receiving device so as to satisfy a condition that the received power approaches a target value when a voltage across an element of the voltage converter or the inverter circuit has reached an upper limit of a withstanding voltage of the element and it is determined that the received power of the power-receiving device has not reached a target value on the basis of the information.

2. The power-transmitting device according to claim 1, wherein the condition includes a condition that power efficiency to the power-receiving device approaches a target value.

3. The power-transmitting device according to claim 1, wherein the condition includes a condition that attenuation in the filter circuit at a frequency, which corresponds to a driving frequency of the inverter circuit, approaches a target value.

4. The power-transmitting device according to claim 2, wherein the condition includes a condition that attenuation in the filter circuit at a frequency, which corresponds to a driving frequency of the inverter circuit, approaches a target value.

5. The power-transmitting device according to claim 1, wherein the element which is disposed from the receiving-side pad to the filter circuit is a reactor in the filter circuit.

6. The power-transmitting device according to claim 2, wherein the element which is disposed from the receiving-side pad to the filter circuit is a reactor in the filter circuit.

7. The power-transmitting device according to claim 3, wherein the element which is disposed from the receiving-side pad to the filter circuit is a reactor in the filter circuit.

8. The power-transmitting device according to claim 4, wherein the element which is disposed from the receiving-side pad to the filter circuit is a reactor in the filter circuit.

9. The power-transmitting device according to claim 5, wherein the reactor is a variable reactor.

10. The power-transmitting device according to claim 5, wherein the reactor is configured to be switchable by a switching element.

11. The power-transmitting device according to claim 1, wherein the control unit stops the supply of power and causes the communication unit to transmit the instruction so as to satisfy the condition when the voltage across the element of the voltage converter or the inverter circuit has reached the upper limit of the withstanding voltage and it is determined that the received power of the power-receiving device has not reached the target value on the basis of the information, and

restarts the supply of power after at least one of inductance and capacitance of the element which is disposed from the receiving-side pad to the filter circuit is changed.

12. A wireless power-supplying system comprising:

the power-transmitting device according to claim 1; and

a power-receiving device that receives power supplied from the power-transmitting device in a wireless manner.