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Inductive power transmitter

A power transmitter, inductive technology, used in current collectors, transportation and packaging, FM carrier systems, etc., can solve problems such as unreliable methods

Active Publication Date: 2019-03-19
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Any undesired effects of manipulation of the primary IPT field on detection are also not considered or characterized, making the proposed method potentially unreliable

Method used

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  • Inductive power transmitter
  • Inductive power transmitter
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Examples

Experimental program
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Embodiment Construction

[0099] exist figure 1 An inductive power transfer (IPT) system 1 is shown in its entirety in . The IPT system includes an inductive power transmitter 2 and an inductive power receiver 3 . The inductive power transmitter 2 is connected to a suitable power source 4, such as mains power or batteries. The inductive power transmitter 2 may comprise a power converter 5 (e.g., an AC-DC converter) (depending on the type of power source used) and an inverter 6 (e.g., connected to the converter 5 (if present)). one or more transmitter circuits. The inverter 6 provides an AC signal to the one or more transmitting coils 7 such that the one or more transmitting coils 7 generate an alternating magnetic field. In some configurations, one or more transmitting coils 7 may also be considered separate from the inverter 5 . One or more transmitting coils 7 may be connected in parallel or in series to a capacitor (not shown) to form a resonant circuit.

[0100] The controller 8 is connectable...

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PUM

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Abstract

The invention provides an inductive power transmitter. The inductive power transmitter comprises a transmission circuit having a coil, the transmission circuit tuned, adapted or optimised at or abouta first frequency for inductive power transfer or object detection; an inverter operable to drive the transmission circuit at the first frequency; and a controller arranged to control the inverter todrive the transmission circuit at a second higher frequency, and to modulate a signal at the second higher frequency according to a predetermined handshake signal in order to generate a response froma predetermined non-authorised device proximate the coil.

Description

technical field [0001] The present invention relates generally to inductive power transmitters for use in inductive power transfer systems particularly but not exclusively. Background technique [0002] IPT systems are a well-known field of existing technologies (eg, wireless charging of electric toothbrushes) and developing technologies (eg, wireless charging of handheld devices on "charging pads"). Typically, a power transmitter generates a time-varying magnetic field from one or more transmit coils. This magnetic field induces an alternating current in a suitable receiving coil in the power receiver, which can then be used to charge a battery or power a device or other load. [0003] For IPT systems for wireless charging of handheld devices, it is particularly important that the wireless power is only transferred to the receiver device and not to so-called foreign objects, which can be defined as being positioned on the charging pad (e.g. , any object on the interface s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J5/00H02J7/02H04B5/00H02J50/00H02J50/10H02J50/60H04B5/48
CPCH02J50/10H02J50/60H02J50/80H04B5/24H04B5/26H04B5/79H04B1/04H04L27/12
Inventor J·D·路易斯
Owner APPLE INC
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