WIRELESS POWER TRANSMISSION AND CHARGING SYSTEM, AND RESONANCE FREQUENCY CONTROL METHOD OF WIRELESS POWER TRANSMISSION AND CHARGING SYSTEM

• US 20120286726A1
• Filed: 05/04/2012
• Published: 11/15/2012
• Est. Priority Date: 05/12/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: KIM, Nam Yun, KWON, Sang Wook, PARK, Yun Kwon
• Granted Patent: US 9,306,399 B2
• Time in Patent Office: Days
• US Class Current: 320/108
• CPC Class Codes: B60L 2210/10 DC to DC converters
• CPC Class Codes: B60L 2210/30 AC to DC converters
• CPC Class Codes: B60L 2210/40 DC to AC converters
• 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: B60L 53/126 Methods for pairing a vehicle and a charging station, e.g. establishing a one-to-one relation between a wireless power transmitter and a wireless power receiver
• CPC Class Codes: B60L 53/36 by positioning the vehicle
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 50/005 Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/50 using additional energy repeaters between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• 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 50/90 involving detection or optimisation of position, e.g. alignment
• 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: H02J 7/00047 with provisions for charging different types of batteries
• CPC Class Codes: H02J 7/00712 the cycle being controlled or terminated in response to electric parameters
• CPC Class Codes: H04B 5/26 using coils
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer
• 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 10/72 : Electric energy management in electromobility
• CPC Class Codes: Y02T 90/12 : Electric charging stations
• CPC Class Codes: Y02T 90/14 : Plug-in electric vehicles
• CPC Class Codes: Y02T 90/16 : Information or communication technologies improving the operation of electric vehicles

Abstract

A wireless power transmission and charging system, and a communication method of the wireless power transmission and charging system are provided. In one embodiment, a resonance frequency control method of a wireless power transmitter may include: generating communication power used for communication in a plurality of target devices using a reference resonance frequency; transmitting communication power to the plurality of target devices; transmitting charging power to the plurality of target devices; and adjusting the reference resonance frequency based on a reflected wave of the charging power, the amount of power received by one or more of the target devices, the amount of the charging power, the transmission efficiency of the charging power, or any combination thereof.

Claims

1. A resonance frequency control method of a wireless power transmitter, the method comprising:

generating communication power used for communication in a plurality of target devices using a reference resonance frequency;

transmitting communication power to the plurality of target devices;

transmitting charging power to the plurality of target devices; and

adjusting the reference resonance frequency based on a reflected wave of the charging power, the amount of power received by one or more of the target devices, the amount of the charging power, the transmission efficiency of the charging power, or any combination thereof.

2. The method of claim 1, wherein generating the communication power comprises converting direct current (DC) voltage supplied to a power amplifier to alternating current (AC) voltage using the reference resonance frequency.

3. The method of claim 1, further comprising:

transmitting a wake-up request message to the plurality of target devices;

receiving, from one or more of the plurality of target devices, response messages corresponding to the wake-up request message; and

detecting the number target devices based on the received response messages.

4. The method of claim 2, further comprising:

generating the charging power by adjusting a signal level of the DC voltage supplied to the power amplifier based on the number of target devices.

5. The method of claim 3, wherein one or more of the response messages corresponding to the wake-up request message comprises a product type of a corresponding target device, manufacturer information of the corresponding target device, a product model name of the corresponding target device, a battery type of the corresponding target device, a charging scheme of the corresponding target device, an impedance value of a load of the corresponding target device, information about a characteristic of a target resonator of the corresponding target device, information about a used frequency band of the corresponding target device, an amount of power to be used for the corresponding target device, an intrinsic identifier of the corresponding target device, product version information or standards information of the corresponding target device, or any combination thereof.

6. The method of claim 4, wherein the generating of the charging power comprises:

determining the signal level of the DC voltage supplied to the power amplifier based on the product type of the corresponding target device, the manufacturer information of the corresponding target device, the product model name of the corresponding target device, the battery type of the corresponding target device, the charging scheme of the corresponding target device, the impedance value of the load of the corresponding target device, the information about the characteristic of the target resonator of the corresponding target device, the information about the used frequency band of the corresponding target device, the amount of the power to be used for the corresponding target device, the intrinsic identifier of the corresponding target device, the product version information or standards information of the corresponding target device, or any combination thereof.

7. The method of claim 1, wherein the adjusting of the reference resonance frequency comprises:

calculating a voltage standing wave ratio (VSWR) based on the voltage level of the reflected wave, and the level of an output voltage and a level of an output current of a source resonator;

determining a tracking frequency having the highest power transmission efficiency among N predetermined tracking frequencies when the VSWR is less than a predetermined reference value; and

generating charging power using the tracking frequency having the highest power transmission efficiency.

8. The method of claim 7, wherein the determining of the tracking frequency having the highest power transmission efficiency comprises:

performing the following operations a) through g) for one or more of the N predetermined tracking frequencies,

a) selecting one of the N predetermined tracking frequencies based on a predetermined frequency selection scheme;

b) changing the reference resonance frequency to the selected tracking frequency;

c) transmitting the charging power;

d) transmitting, to the plurality of target devices, a command to request an input voltage value and an input current value of a target device, or a command to request a DC/DC output voltage value and a DC/DC output current value of the target device;

e) receiving, from each of the plurality of target devices, an input voltage value and an input current value of a rectification unit, or the DC/DC output voltage value and the DC/DC output current value;

f) calculating an amount of power received by each of the plurality of target devices based on the input voltage value and the input current value, or the DC/DC output voltage value and the DC/DC output current value; and

g) calculating the transmission efficiency of the charging power based on an output voltage level and an output current level of the source resonator, and the amount of the power received by each of the plurality of target devices.

9. The method of claim 8, wherein the predetermined frequency selection scheme in the operation a) corresponds to a scheme of selecting frequencies in a sequential order, starting from a low frequency to a high frequency among the N predetermined tracking frequencies, or a scheme of selecting frequencies in a sequential order, starting from a high frequency to a low frequency among the N predetermined tracking frequencies.

10. The method of claim 8, wherein the predetermined frequency selection scheme in the operation a) corresponds to a scheme of sequentially selecting M predetermined tracking frequencies from the N predetermined tracking frequencies, primarily performing the operations b) through g) continuously for one or more of the M predetermined tracking frequencies, and secondarily performing the operations b) through g) continuously for each tracking frequency, excluding the M predetermined tracking frequencies from the N predetermined tracking frequencies, M being less than N.

11. The method of claim 8, wherein the predetermined frequency selection scheme in the operation a) corresponds to a scheme of classifying the N predetermined tracking frequencies into M groups, selecting one of the M groups based on the number of the plurality of target devices, and sequentially selecting tracking frequencies included in the selected group, M being less than N.

12. A wireless power transmitter comprising:

a power converter configured to generate communication power used for communication, charging power used for charging in a plurality of target devices, or both using a reference resonance frequency;

a source resonator configured to transmit, to the plurality of target devices, the communication power, the charging power, or both; and

a control/communication unit configured to adjust the reference resonance frequency based on a reflected wave of the charging power, the amount of power received by one or more of the plurality of target devices, the amount of the charging power, the transmission efficiency of the charging power, or any combination thereof.

13. The wireless power transmitter of claim 12, wherein the power converter is configured to generate the communication power, the charging power, or both by converting direct current (DC) voltage supplied to a power amplifier to alternating current (AC) voltage using the reference resonance frequency.

14. The wireless power transmitter of claim 13, wherein the control/communication unit is configured to adjust the signal level of the DC voltage supplied to the power amplifier based on the number of the plurality of target devices.

15. The wireless power transmitter of claim 14, wherein the control/communication unit is configured to determine the signal level of the DC voltage to be supplied to the power amplifier, based on a product type of a corresponding target device, manufacturer information of the corresponding target device, a product model name of the corresponding target device, a battery type of the corresponding target device, a charging scheme of the corresponding target device, an impedance value of a load of the corresponding target device, information about a characteristic of a target resonator of the corresponding target device, information about a used frequency band of the corresponding target device, an amount of power to be used for the corresponding target device, an intrinsic identifier of the corresponding target device, product version information or standards information of the corresponding target device, or any combination thereof.

16. The wireless power transmitter of claim 12, wherein the control/communication unit is configured to calculate a voltage standing wave ratio (VSWR) based on a voltage level of the reflected wave, and a level of an output voltage and a level of an output current of the source resonator, to calculate a power transmission efficiency for one or more of N predetermined tracking frequencies when the VSWR is less than a predetermined value, to determine a tracking frequency having the highest power transmission efficiency, among the N predetermined tracking frequencies, and to change the reference resonance frequency to the tracking frequency having the highest power transmission efficiency.

17. The wireless power transmitter of claim 16, wherein the control/communication unit is configured to perform the following operations a) through g) for one or more of the N predetermined tracking frequencies in order to determine the tracking frequency having the highest power transmission efficiency,

a) selecting one of the N predetermined tracking frequencies based on a predetermined frequency selection scheme;

b) changing the reference resonance frequency to the selected tracking frequency;

c) transmitting the charging power;

d) transmitting, to the plurality of target devices, a command to request an input voltage value and an input current value of a target device, or a command to request a DC/DC output voltage value and a DC/DC output current value of the target device;

e) receiving, from each of the plurality of target devices, an input voltage value and an input current value of a rectification unit, or the DC/DC output voltage value and the DC/DC output current value;

f) calculating an amount of power received by each of the plurality of target devices, based on the input voltage value and the input current value, or the DC/DC output voltage value and the DC/DC output current value; and

g) calculating a transmission efficiency of the charging power, based on an output voltage level and an output current level of the source resonator, and the amount of the power received by each of the plurality of target devices.

18. The wireless power transmitter of claim 17, wherein the predetermined frequency selection scheme in the operation a) corresponds to a scheme of selecting frequencies in a sequential order, starting from a low frequency to a high frequency among the N predetermined tracking frequencies, or a scheme of selecting frequencies in a sequential order, starting from a high frequency to a low frequency among the N predetermined tracking frequencies.

19. The wireless power transmitter of claim 17, wherein the predetermined frequency selection scheme in the operation a) corresponds to a scheme of sequentially selecting M predetermined tracking frequencies from the N predetermined tracking frequencies, primarily performing the operations b) through g) continuously for each of the M predetermined tracking frequencies, and secondarily performing the operations b) through g) continuously for each tracking frequency, excluding the M predetermined tracking frequencies from the N predetermined tracking frequencies, M being less than N.

20. The wireless power transmitter of claim 17, wherein the predetermined frequency selection scheme in the operation a) corresponds to a scheme of classifying the N predetermined tracking frequencies into M groups, selecting one of the M groups based on the number of the plurality of target devices, and sequentially selecting tracking frequencies included in the selected group, M being less than N.

21. A wireless power receiver comprising:

a target resonator configured to receive power from a source resonator; and

a control/communication unit configured to;

detect the amount of power received by the target resonator, and

transmit, to the wireless power transmitter, information about the amount of the power received by the target resonator.

22. The wireless power receiver of claim 21, wherein the control/communication unit configured to receive a wake-up request message from the wireless power transmitter.

23. The wireless power receiver of claim 21, further comprising:

a rectification unit configured to generate a direct current (DC) signal by rectifying an alternating current (AC) signal of the power received by the target resonator; and

a DC/DC converter configured to supply voltage of a predetermined level to a load by adjusting a level of the DC signal.

24. The wireless power receiver of claim 21, wherein the control/communication unit is configured to transmit, to the wireless power transmitter, a response message comprising a product type of a corresponding target device, manufacturer information of the corresponding target device, a product model name of the corresponding target device, a battery type of the corresponding target device, a charging scheme of the corresponding target device, an impedance value of a load of the corresponding target device, information about a characteristic of a target resonator of the corresponding target device, information about a used frequency band of the corresponding target device, an amount of power to be used for the corresponding target device, an intrinsic identifier of the corresponding target device, product version information or standards information of the corresponding target device, or any combination thereof.

25. The wireless power receiver of claim 21, wherein the information about the amount of the power received by the target resonator corresponds to an input voltage value and an input current value of the rectification unit, an output voltage value and an output current value of the rectification unit, or a DC/DC output voltage value and a DC/DC output current value.

26. A power receiving method of a wireless power receiver, the method comprising:

receiving communication power used for communication, that is generated using a reference resonance frequency, from a wireless power transmitter;

receiving first charging power from the wireless power transmitter; and

receiving second charging power that is generated using an adjusted reference resonance frequency after the reference resonance frequency has been adjusted in the wireless power transmitter.

27. The method of claim 26, further comprising:

receiving a wake-up request message from the wireless power transmitter; and

transmitting, to the wireless power transmitter, a response message corresponding to the wake-up request message.

28. The method of claim 26, wherein the first charging power is generated by adjusting a signal level of a direct current (DC) voltage to be supplied to a power amplifier of the wireless power transmitter.

29. The method of claim 26, wherein the reference resonance frequency is adjusted based on a reflected wave of the first charging power, an amount of the first charging power, or a transmission efficiency of the first charging power.

30. The method of claim 26, wherein the response message corresponding to the wake-up request message comprises a product type of a corresponding target device, manufacturer information of the corresponding target device, a product model name of the corresponding target device, a battery type of the corresponding target device, a charging scheme of the corresponding target device, an impedance value of a load of the corresponding target device, information about a characteristic of a target resonator of the corresponding target device, information about a used frequency band of the corresponding target device, an amount of power to be used for the corresponding target device, an intrinsic identifier of the corresponding target device, or product version information or standards information of the corresponding target device.

31. The method of claim 26, wherein the adjusted reference resonance frequency corresponds to a tracking frequency having the highest power transmission efficiency, among N predetermined tracking frequencies.

32. The method of claim 31, wherein the tracking frequency having the highest power transmission efficiency is determined by performing the following operations a) through c) for each of the N predetermined tracking frequencies,

a) receiving the second charging power;

b) receiving, from the wireless power transmitter, a command to request an input voltage value and an input current value of a target device, or a command to request a DC/DC output voltage value and a DC/DC output current value of the target device; and

c) transmitting, to the wireless power transmitter, an input voltage value and an input current value of a rectification unit, or the DC/DC output voltage value and the DC/DC output current value.

33. A resonance frequency control method of a wireless power transmitter, the method comprising:

adjusting a reference resonance frequency of the wireless power transmitter based on a reflected wave of a charging power, the amount of power received by one or more of target devices, the amount of the charging power, the transmission efficiency of the charging power, or any combination thereof.