Power-supplying device, and wireless power-supplying system

• US 10,148,128 B2
• Filed: 08/24/2015
• Issued: 12/04/2018
• Est. Priority Date: 06/14/2013
• Status: Active Grant

• Current Assignee: IHI Corporation
• Original Assignee: IHI Corporation
• Inventors: Murayama, Takahiko
• Primary Examiner(s): Berhanu, Samuel
• Application Number:
  US14/833,286
• Publication Number:
  US 20150364947A1
• Time in Patent Office: 1,198 Days
• Field of Search: 320108
• 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 provided with a first leg formed of a first switching element and a second switching element connected in series, and a second leg formed of a third switching element and a fourth switching element connected in series;

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 perform at least one of adjusting phase differences between a switching signal that controls ON and OFF of the first switching element and a switching signal that controls ON and OFF of the third switching element, and between a switching signal that controls ON and OFF of the second switching element and a switching signal that controls ON and OFF of the fourth switching element and decreasing frequencies of the respective switching signals 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 duty ratio 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, 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 at least one of the phase difference and the frequencies based on the state information of the power-receiving device.

4. 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 and provided with a first leg formed of a first switching element and a second switching element connected in series, and a second leg formed of a third switching element and a fourth switching element connected in series;

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 inverter circuit so that an inter-terminal voltage of a specific element constituting the voltage converter, 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 phase differences between a switching signal that controls ON and OFF of the first switching element and a switching signal that controls ON and OFF of the third switching element, and between a switching signal that controls ON and OFF of the second switching element and a switching signal that controls ON and OFF of the fourth switching element, and decreasing respective frequencies of the respective switching signals so that the inter-terminal voltage does not exceed a predetermined limit value.

5. A wireless power-supplying system, comprising:

a power-supplying device including an inverter circuit, a first resonance circuit connected to the inverter circuit provided with a first leg formed of a first switching element and a second switching element connected in series, and a second leg formed of a third switching element and a fourth switching element connected in series and configured to transfer alternating current power to a power-receiving device in a wireless manner, and a switching control unit configured to perform at least one of adjusting phase differences between a switching signal that controls ON and OFF of the first switching element and a switching signal that controls ON and OFF of the third switching element, and between a switching signal that controls ON and OFF of the second switching element and a switching signal that controls ON and OFF of the fourth switching element and decreasing the respective frequencies of the switching signals 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.

6. The wireless power-supplying system according to claim 5,

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 the phase difference and decreases the frequencies based on the second inter-terminal voltage of the power-receiving device.

7. The wireless power-supplying system according to claim 5,

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.