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Transmitter
EVK H
F
ARDWARE
The functional block diagram of the A11 wireless power transmitted EVK is shown below.
ACT6311
5V
USB
Connector
The EVK is powered by 5VDC via Micro-USB connector as shown above. The input voltage is boosted to
6.5V with the ACT6311 DC-DC Converter which powers the PAC5220WP. Active-Semi's PAC5220WP is
a Power Application Controller™ that integrates essential blocks such as the Multi-mode Power
TM
Manager
, Configurable Analog Frontend
Engines, full H-bridge drivers, along with ARM Cortex
functions per WPC specifications.
The PAC5220WP manages the following WPC A11 Transmitter functions:
Low Power Standby: When there is no receiver present, the PAC5220WP goes into a low power mode
that minimizes quiescent current to less than 50mW for the entire EVK.
Communication & Control: Discovers the presence of receiver placed on charging pad during selection,
demodulation of the communication response received from A11 Wireless Power Receiver sent using
load modulation sensed at the transmitter coil, advance through ping, ID & configuration phases to
transfer power.
Power Transfer: Once the receiver is identified and the "Power Transfer Contract" as specified by WPC
standard is established by PAC5220WP's firmware, transmits power by driving the full H-bridge
connected to the transmitter coil. Power transfer is regulated per WPC specification and based on the
periodic communications received from the wireless power receiver
Detection of Invalid or Foreign Objects: By monitoring input and output power, the PAC5220WP can
detect invalid or foreign objects place on the charging pad. The PAC5220WP implements the WPC
© 2014 Copyright, Active-Semi International, Inc.
No portion of this document may be reproduced or reused in any form without Active-Semi's prior written consent
EATURES
6.5V
PAC5220WP
TM
with Differential amplifiers, 10-bit 1MHz ADC, PWM
PAC5220WP A11 WPC
Power Application Controller
HS
LS
HS-B
LS-B
ISENSE
TM
M0 processor to implement A11 Transmitter
- 5
-
HS-B
LS-B
Rev 1.7 May, 2014
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