NXP Semiconductors AN11524, Примечание к применению

Страница: 3 / 54

AN11524 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Application note Rev. 1 — 17 February 2015 3 of 54
NXP Semiconductors
AN11524
NXQ1TXA6 Evaluation Board
1. Introduction
The ubiquity of mobile phones, increases the requirement of a convenient way to charge
these devices while on the move. Especially the fast rising number of smart phones widely
used and relied upon in daily life. Wireless charging is introduced into smart phones and
tablets.
Wireless charging represents the future of public and private charging.
Qi (pronounced as "Chee") is a wireless charging standard developed by Wireless Power
Consortium (www.wirelesspowerconsortium.com) for inductive power.
The Qi system (see Figure 1 ) comprises a base station or a transmitter (TX) pad and a
mobile device or a compatible receiver (RX), such as a mobile phone. To use the system,
the mobile device is placed on top of the base station pad which charges the device via
electromagnetic induction.
The market demand for the convenience and safety of standard-compliant wireless power
systems continues to grow rapidly.
NXP offers Qi-compliant base station reference designs to set you immediately on your
way to a successful project. NXP supports several types of Qi base stations. This
document describes the application of an A6 type base station using NXQ1TXA6 charging
controller.
Fig 1. Wireless charging system as defined by Wireless Power Consortium
aaa-014485
BASE STATION
TRANSMITTER
COMM
messages
reflected load
power
CONTROL
SYSTEM
POWER CONVERSION
demod
MOBILE DEVICE
RECEIVER
CONTROL COMM
LOAD
POWER PICK-UP
mod