Systems and methods for determining coil current in wireless power systems

A wireless power and coil technology, applied in the direction of voltage/current isolation, current only measurement, current/voltage measurement, etc., can solve problems such as difficult current measurement

Active Publication Date: 2021-07-23
WITRICITY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in complex electronic systems, it can be difficult to measure current accurately and / or reliably without introducing losses or interruptions in the system

Method used

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  • Systems and methods for determining coil current in wireless power systems
  • Systems and methods for determining coil current in wireless power systems
  • Systems and methods for determining coil current in wireless power systems

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0060] Used to determine coil current I 1 The first exemplary embodiment of the system and / or method can use the following derivation:

[0061]

[0062]

[0063]

[0064]

[0065]

[0066]

[0067]

[0068] Figure 3A Is used to determine the coil current I 1 A block diagram of the first exemplary system and / or method. The exemplary system and / or method 300 perform step 1.7 exported by electronic signals and / or components (eg, in hardware and / or software). Specifically, in the upper branch, current sense transformer 302 receives current I 3 And generate with current I 3 Based output voltage V I3CS . This voltage signal V I3CS Then filter in the band pass filter 304 to produce a voltage signal V. I3CS The voltage signal V of the fundamental frequency component V I3M . In block 306, voltage signal V I3M Zoom L C C 2 Ω 2 . Voltage signal V I3M It is also scaled by block 308 for from current I 3 The total gain matching of the positive input of the subtraction fra...

no. 2 example

[0072] Used to determine coil current I 1 The second exemplary embodiment of the system and / or method can use the following derivation:

[0073]

[0074]

[0075]

[0076]

[0077] Figure 4 Is used to determine the coil current I 1 A block diagram of the second exemplary system and / or method. The exemplary system and / or method 400 implements step 2.4 derived by electronic signals and / or components (e.g., in hardware and / or software). Specifically, in the upper branch, current sensing transformer 402 receives current I 3 And generate with current I 3 Based output voltage V I3CS . This voltage signal V I3CS Then filter in the band pass filter 404 to produce a voltage signal V. I3CS The voltage signal V of the fundamental frequency component V I3M . In block 406, voltage signal V I3M Differential and l C Zoom. Voltage signal V I3M Also zoom at block 408 so as to be from current I 3 The total gain matching of the subtraction frame 420 is from current I 2 The total g...

no. 3 example

[0079] Used to determine coil current I 1 The third exemplary embodiment of the system and / or method can use the following derivation:

[0080] I 1 = I 3 -I 2 (3.1)

[0081]

[0082]

[0083]

[0084] Figure 5 Is used to determine the coil current I 1 A block diagram of the third exemplary system and / or method. The exemplary system and / or method 500 perform step 3.4 exported by electronic signals and / or components (eg, in hardware and / or software). Specifically, in the upper branch, current sensing transformer 502 receives current I 3 And generate with I 3 Based output voltage V I3CS . In block 504, this voltage signal V I3CS Differential and being l C Zoom. Voltage signal V I3M The block 506 is also zoomed in order to 3 The total gain matching of the positive input of the subtraction frame 518 is from I 2 The total gain of the negative input of the subtraction frame 518. In the lower branch, the capacitive voltage divider 508 receives the output voltage V. TMNO G...

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PUM

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Abstract

Disclosed herein are systems and methods for determining a current of a resonator coil during operation of a wireless power system having the resonator coil, in which the resonator coil is coupled to a fixed capacitive network and a reactance circuit. The systems and methods can include determining a first signal which can include receiving a current in an inductor of the reactance circuit; converting the current to a voltage signal; and scaling the voltage signal. The systems and methods can include determining a second signal which can include receiving an output voltage at an output of the reactance circuit; dividing the output voltage; and integrating the divided scaled voltage to produce an inverted differentiated voltage signal. The methods can include summing the first signal and the second signal to produce a summed signal; and determining the current in the resonator coil based on the summed signal.

Description

[0001] Cross-reference [0002] According to 35U.sc§l 19 (e) requirements, "System and Method for Determining Coil Currents in Wireless Power System", US Temporary Patent Application No. 62 / 754, 351, filed on November 1, 2018 The priority and interests of the number, which are incorporated herein by reference. Technical field [0003] The following disclosure is directed to a method and system for determining a coil current in a wireless power system, and more specifically, a method and system for determining a coil current in a wireless power system without direct measurement and having high precision. Background technique [0004] Current measurements can usually be carried out using an amperage or current sensitive resistor. However, in a complex electronic system, loss or interrupts are not introduced in the system, it may be difficult to accurately and / or reliably measure current. Inventive content [0005] In the wireless power system (in the wireless power system, the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R15/18
CPCG01R19/0092G01R15/18B60L53/12H02J50/12H01F38/14B60L53/122B60L53/124H02J50/60
Inventor C·罗克福德M·达尼洛维奇
Owner WITRICITY CORP
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