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Charge current monitoring or control in a resonance-tuned inductive charger

A technology for tuning circuits and battery chargers, which is applied in circuit monitoring/indication, current collectors, battery circuit devices, etc., and can solve problems such as inability to locate and charge test devices, unreliability, and invalid charging

Active Publication Date: 2016-10-26
LOREAL SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing systems cannot test whether the positioning of the device affects charging, which may result in ineffective or unreliable charging

Method used

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  • Charge current monitoring or control in a resonance-tuned inductive charger
  • Charge current monitoring or control in a resonance-tuned inductive charger
  • Charge current monitoring or control in a resonance-tuned inductive charger

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Embodiment Construction

[0024] The detailed description, set forth below in conjunction with the accompanying drawings, in which like reference numerals refer to like elements, is intended as a description of various embodiments of the disclosed subject matter and is not intended to represent only the embodiments. The various embodiments described in this disclosure are provided merely as examples or illustrations, and should not be construed as preferred or advantageous over other embodiments. The illustrative examples provided herein are not intended to be exhaustive or to limit claimed subject matter to the precise forms disclosed.

[0025] The following discussion provides examples of systems, devices, and / or methods related to inductive charging of batteries of portable electronic devices such as, for example, electric toothbrushes and / or electric skin brushes, among others. In this regard, inductive charging generally involves a sending or transmitter-side inductor in the form of a coil (someti...

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PUM

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Abstract

A battery charger and methods for magnetically transferring power from a power source to a battery is disclosed. A driver circuit outputs a modulated signal having a duty cycle from the power source to a sender-side circuit and across a space to a receiver-side tuned circuit. A sender-side sensor is configured to sense a parameter of the sender-side tuned circuit. The controller modifies the first duty cycle of the modulated signal based on the sensed parameter. A receiver-side circuit capable of determining charge status of the receiver side is also disclosed.

Description

Background technique [0001] Inductive charging is a wireless charging technique that has been increasingly used in low-cost electronic devices. One inductive charging technique uses a PWM transmitter square oscillator with a fixed frequency and variable duty cycle. On the downside, this approach requires using the sensed receiver-side current as feedback while controlling the transmitter-side PWM duty cycle. Heretofore, such feedback has been achieved by sensing the receiver-side charging current using a device located on the receiver side and communicating the sensed receiver-side charging current information from the receiver-side across the air gap to the transmitter-side component. Such a wireless feedback mechanism between a transmitter-side device and a receiver-side device adds complexity and cost and, therefore, is not suitable for many low-cost electronic device applications. [0002] Additionally, to obtain efficient inductive power transfer between these devices, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/02H02J50/12
CPCH02J5/005H02J7/025H02J7/0077H02J7/0044H02J7/0047H02J7/00H02J50/12H02J50/80H02J7/00712H02J50/90H02J7/00718H02J7/007184H04B5/79
Inventor D·A·冈德森
Owner LOREAL SA