POWER-SUPPLYING DEVICE, AND WIRELESS POWER-SUPPLYING SYSTEM

• US 20150364947A1
• Filed: 08/24/2015
• Published: 12/17/2015
• Est. Priority Date: 06/14/2013
• Status: Active Grant

• Current Assignee: IHI Corporation
• Original Assignee: IHI Corporation
• Inventors: MURAYAMA, Takahiko
• Granted Patent: US 10,148,128 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 7/00712 the cycle being controlled or terminated in response to electric parameters
• CPC Class Codes: H02M 1/0058 by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero using an auxiliary actively switched resonant commutation circuit connected to an intermediate DC voltage or between two push-pull branches of an inverter bridge H02M7/4811; in resonant inverters H02M7/4815; in inverters operating from a resonant DC source H02M7/4826
• CPC Class Codes: H02M 1/007 Plural converter units in cascade push-pull DC/DC converters with pre-regulator H02M3/3374; DC-AC converters following a DC-DC stage including a high frequency transformer H02M7/4807; DC-AC converters following a DC-DC conversion stage generating periodically varying voltages H02M7/4826
• 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 3/01 Resonant DC/DC converters
• CPC Class Codes: H02M 3/33573 Full-bridge at primary side of an isolation transformer
• CPC Class Codes: H02M 7/53871 with automatic control of output voltage or current
• 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

A power-supplying device including an inverter circuit, a resonance circuit connected to the inverter circuit and configured to transfer alternating current power to a power-receiving device in a wireless manner, and a switching control unit that adjusts a parameter of respective switching signals that control ON and OFF of respective switching elements constituting the inverter circuit so that an inter-terminal voltage of a specific element constituting the inverter circuit or the resonance circuit does not exceed a predetermined limit value.

Claims

1. A power-supplying device, comprising:

an inverter circuit;

a resonance circuit connected to the inverter circuit and configured to transfer alternating current power to a power-receiving device in a wireless manner; and

a switching control unit configured to adjust a parameter of respective switching signals that control ON and OFF of respective switching elements constituting the inverter circuit so that an inter-terminal voltage of a specific element constituting the inverter circuit or the resonance circuit does not exceed a predetermined limit value.

2. The power-supplying device according to claim 1,

wherein the switching control unit adjusts a frequency of each switching signal so that the inter-terminal voltage does not exceed the predetermined limit value.

3. The power-supplying device according to claim 1,

wherein the switching control unit adjusts a duty ratio of each switching signal so that the inter-terminal voltage does not exceed the predetermined limit value.

4. The power-supplying device according to claim 1,

wherein the switching control unit adjusts a phase difference between the respective switching signals so that the inter-terminal voltage does not exceed the predetermined limit value.

5. The power-supplying device according to claim 1, further comprising:

a communication unit connected to the switching control unit, configured to acquire state information of the power-receiving device from the power-receiving device,

wherein the switching control unit adjusts the parameter of the respective switching signals based on the state information of the power-receiving device.

6. A power-supplying device, comprising:

a voltage converter which receives power based on power supplied from outside;

an inverter circuit connected to the voltage converter;

a resonance circuit connected to the inverter circuit and configured to transfer alternating current power to a power-receiving device in a wireless manner; and

a switching control unit configured to control the voltage converter or the inverter so that an inter-terminal voltage of a specific element constituting the voltage converter circuit, the inverter circuit, or the resonance circuit does not exceed a predetermined limit value,

wherein the switching control unit configured to perform at least one of

adjusting a transformation ratio of the voltage converter so that the inter-terminal voltage does not exceed a predetermined limit value, and

adjusting a parameter of respective switching signals that control ON and OFF of respective switching elements constituting the inverter circuit.

7. A wireless power-supplying system, comprising:

a power-supplying device including an inverter circuit, a first resonance circuit connected to the inverter circuit and configured to transfer alternating current power to a power-receiving device in a wireless manner, and a switching control unit configured to adjust a parameter of respective switching signals that control ON and OFF of respective switching elements constituting the inverter circuit so that a first inter-terminal voltage of a specific element constituting the inverter circuit or the first resonance circuit does not exceed a predetermined limit value;

a second resonance circuit configured to receive the alternating current power from the power-supplying device in a wireless manner; and

a rectification circuit connected to the second resonance circuit and configured to supply power to a battery.

8. The wireless power-supplying system according to claim 7,

wherein the power-receiving device further includes

a measurement unit that measures a second inter-terminal voltage of a specific element constituting the second resonance circuit or the rectification circuit;

a control unit connected to the measurement unit and configured to supply the second inter-terminal voltage; and

a second communication unit connected to the control unit and configured to supply the second inter-terminal voltage to the power-supplying device,

the power-supplying device further includes

a first communication unit connected to the switching control unit and configured to acquire the second inter-terminal voltage from the power-receiving device, and

the switching control unit adjusts each parameter of the switching signal based on the second inter-terminal voltage of the power-receiving device.

9. The wireless power-supplying system according to claim 7,

wherein the switching control unit adjusts a frequency of each switching signal so that the first inter-terminal voltage does not exceed a predetermined limit value.

10. The wireless power-supplying system according to claim 7,

wherein the switching control unit adjusts a duty ratio of each switching signal so that the first inter-terminal voltage does not exceed a predetermined limit value.