Wireless charging method and apparatus based on radio frequency receiving and phase compensation retransmission

• US 10,615,624 B2
• Filed: 12/22/2016
• Issued: 04/07/2020
• Est. Priority Date: 04/08/2016
• Status: Active Grant

• Current Assignee: University of Electronic Science and Technology of China
• Original Assignee: University Electronic Science & Tech
• Inventors: Nie, Zaiping, Yang, Yuan, Zong, Xianzheng
• Primary Examiner(s): Isla, Richard
• Assistant Examiner(s): Hernandez, Manuel
• Application Number:
  US15/387,813
• Publication Number:
  US 20170294796A1
• Time in Patent Office: 1,202 Days
• Field of Search: 320108, 307104
• CPC Class Codes: A61N 1/3787 from an external energy source
• CPC Class Codes: H02J 2310/23 The load being a medical device, a medical implant, or a life supporting device
• CPC Class Codes: H02J 50/23 characterised by the type of transmitting antennas, e.g. directional array antennas or Yagi antennas
• CPC Class Codes: H02J 50/27 characterised by the type of receiving antennas, e.g. rectennas
• CPC Class Codes: H02J 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge

Abstract

Embodiments provide focused wireless charging method and apparatus based on radio frequency receiving and phase compensation retransmission. The method is based on the reciprocity principle, making each charging signal transmitted by the external charging system could stack in-phase when arriving at the embedded rechargeable battery, realizing wireless near field focusing in any given area in an unknown complex inhomogeneous propagation environment and a high charging efficiency. The focused wireless charging technology based on radio frequency receiving and phase compensation retransmission in embodiments could realize in-phase stacking and precise focus of each wireless charging signal of the external system on the embedded batteries to be charged automatically under different propagation environment, different environment medium, and possible random offset of the rechargeable battery. This method has strong environmental adaptability, high energy transmission efficiency, transmission stability, less radiation to human body and no need of accurate information of the location of charging equipment.

Claims

1. A near field focused wireless charging method based on radio frequency receiving and phase compensation retransmission, comprising:

a first step of transmitting a wake-up signal to an embedded system by an external system, making the embedded system being in a state to be charged, wherein, the embedded system is embedded or implanted in a human body that comprises a time-varying complex inhomogeneous environment;

a second step of transmitting a test signal at a given frequency by the embedded system, receiving the test signal by the external system, and measuring relative phase delay data of the test signal received by each one of multiple antenna units according to a reference phase of a same frequency reference signal of the external system;

a third step of converting the external system to a feeding state, and for each antenna unit of the multiple antenna units of the external system, setting an initial phase of a feed signal of the antenna unit according to the phase delay data of the test signal received by the antenna unit in the second step, wherein the setting comprises converting the phase delay data of the test signal received by the antenna unit to an equal sized phase advance of the feed signal of the antenna unit, causing the initial phase of the feed signal of the antenna unit to be an opposite value of the phase of the test signal received by the antenna unit, and realizing stacking in same phase by each signal when same frequency signals transmitted by each one of the multiple antenna units of the external system arrive at a receiving antenna of the embedded system;

a fourth step of feeding a transmitting multiple antenna system according to a phase configuration in the third step by the external system, wherein signals are transmitted to the receiving antenna of the embedded system by each one of the multiple antenna units, realizing an in-phase stacking and a focus of field at the receiving antenna of the embedded system, and

realizing wireless charging to the embedded system;

a fifth step of transmitting an acknowledgement signal by the embedded system after completing the wireless charging, and stopping the wireless charging after the acknowledgement signal is received by the external system.

2. The method according to claim 1, wherein the second step, the third step, and the fourth step are executed more than once according to a requirement.

3. A near field focused wireless charging apparatus based on radio frequency receiving and phase compensation retransmission, comprising:

an embedded system embedded or implanted in human body that comprises a time-varying complex inhomogeneous environment, comprising;

a rechargeable battery;

a signal source;

a receiving antenna configured to receive a feed signal from the external system, realizing stacking in same phase by each feed signal when the feed signal transmitted by each one of multiple antenna units of the external system arrives at a receiving antenna of the embedded system; and

a transmitting antenna configured to transmit a test signal at a given frequency, and to transmit an acknowledgement signal after completing the wireless charging, so as to stop the wireless charging after the acknowledgement signal is received by the external system;

an external system, comprising;

a power source;

a phase control apparatus configured to convert the external system to a feeding state, and for each antenna unit of the multiple antenna units of the external system, to set an initial phase of a feed signal of the antenna unit according to a phase delay data of the test signal received by the antenna unit, comprising converting the phase delay data of the test signal received by the antenna unit to an equal sized phase advance of the feed signal of the antenna unit, causing the initial phase of the feed signal of the antenna unit to be an opposite value of the phase of the test signal received by the antenna unit, and realizing stacking in same phase by each signal when the signals with the same frequency transmitted by each one of the multiple antenna units of the external system arrive at a receiving antenna of the embedded system;

a receiving multiple antenna system configured to receive the test signal from the embedded system and to measure relative phase delay data of the test signal received by each of multiple antenna units according to a reference phase of a same frequency reference signal of the external system; and

a transmitting multiple antenna system configured to transmit a wake-up signal to the embedded system to make the embedded system being in a state to be charged, and to transmit the feed signals converted by the phase control apparatus to the embedded system, wherein the feed signals are transmitted to the receiving antenna of the embedded system by each one of the multiple antenna units, realizing an in-phase stacking and a focus of field at the receiving antenna of the embedded system.

4. The apparatus according to claim 3,

wherein the embedded system further comprises a first receiving/transmitting control machine, and the receiving antenna and the transmitting antenna are a same antenna,

wherein the external system further comprises a second receiving/transmitting control machine, and the receiving multiple antenna system and the transmitting multiple antenna system are a same multiple antenna system.

5. The apparatus according to claim 3, wherein each antenna unit of the receiving multiple antenna system and the transmitting multiple antenna system comprises a microstrip patch antenna, a microstrip slot antenna, an element antenna, a helical antenna, or a dielectric resonator antenna.

6. The apparatus according to claim 3, wherein the receiving multiple antenna system and the transmitting multiple antenna system of the external system comprise a one-dimensional linear antenna array, a two-dimensional planar antenna array, a surface antenna array, or a conformal antenna array of carrier conformal configured to transmit energy to its internal.