Nonlinear system identification for object detection in a wireless power transfer system

A wireless power transmission, object technology, applied in electromagnetic wave systems, frequency measurement devices, measuring interference from external sources, etc., can solve problems such as reducing efficiency

Active Publication Date: 2015-10-07
NUCLEUS SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When coupling is reduced, less power is transferred, while power loss in

Method used

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  • Nonlinear system identification for object detection in a wireless power transfer system
  • Nonlinear system identification for object detection in a wireless power transfer system
  • Nonlinear system identification for object detection in a wireless power transfer system

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Embodiment Construction

[0034] Before presenting the details of the different embodiments, some of the problems addressed by these embodiments will first be discussed.

[0035] figure 2 The general electrical impedance of a tuning coil is given which, for example, may correspond to a transmitting coil in a wireless power transfer system. The impedance of an ideal capacitor in series with an inductor has zero values ​​at the resonant frequency and the natural frequency, as shown in curve C. When the second flat coil (inductor and capacitor connected in parallel) which is regarded as the receiving coil comes close to the transmitting coil, as shown by curve A, the impedance at the natural frequency increases significantly. The curve marked B shows the impedance of the two-coil system when the receiving coil also includes a resistive load in the circuit to dissipate the power generated in the outer loop. Understandably, impedance measurements requiring only contact with the two terminals of the trans...

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Abstract

A method of detecting whether a receiver coil is near a transmit coil in a wireless power transfer system (WPTS), the method involving: applying a pseudo-random signal to the transmit coil; while the pseudo-random signal is being applied to the transmit coil, recording one or more signals produced within the WPTS in response to the applied pseudo-random signal; by using the one or more recorded signals, generating a dynamic system model for some aspect of the WPTS; and using the generated dynamic system model in combination with stored training data to determine whether an object having characteristics distinguishing the object as a receiver coil is near the transmit coil.

Description

[0001] This application claims priority to US Provisional Application No. 61 / 738,786, filed December 18, 2012, the entire contents of which are hereby incorporated by reference. technical field [0002] Embodiments of the invention generally relate to wireless power transfer for charging and / or powering systems such as, but not limited to, electric vehicles and portable devices. Background technique [0003] With the renaissance of electric vehicles, we have found many new developments in battery technology, fast charging technology and wireless power transfer for convenient battery charging methods. Wireless fast charging technology is becoming increasingly relevant to pure electric vehicles as a way to alleviate the limitations imposed by existing battery technologies. The battery could thus be charged at a traffic light by driving a coil embedded in the road, in a parking lot while shopping, or at a drive-through. [0004] Wireless power transfer has a long history, poss...

Claims

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Application Information

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IPC IPC(8): H02J5/00H02J7/02
CPCG01R23/02G01R19/2509G01R25/00G01R31/001H02J5/005H02J7/025H02J17/00H02J50/60H02J50/12H02J50/90H02J7/007Y02T10/70Y02T90/14Y02T10/7072Y02T90/12H02J50/10H02J50/80G06F30/00Y02P90/02
Inventor 瑟奇·R·拉方泰纳伊恩·W·汉特
Owner NUCLEUS SCI
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