The bq500110 integrates most of the logic function required to control Wireless Power Transfer and facilitate communication in the single channel WPC compliant contactless charging base station.
The bq500110 is an intelligent device that periodically pings surrounding environment for available devices to be powered while minimizing the idle power; monitors all communication from the mobile device being wirelessly powered; adjusts power applied to the transmitter coil per information received from the powered device. The bq500110 also manages fault conditions associated with power transfer and controls status signal (LEDs) to indicate operating modes.
The bq500110 comes in the area saving 48-pin, 7mm × 7mm QFN package and operates over temperature range from –40°C to 110°C.
Features
- Intelligent Control of the Power Transfer between Base Station and Mobile Device
- Conforms to Version 1.0 of the Wireless Power Consortium (WPC) Transmitter Specifications
- Demodulates and Decodes WPC Complaint Message Packets from the Power Receiving Device Over the Same Wireless Link that Transfers Electrical Power
- Implements closed-loop Power Transfer PID Control by modulating frequency of the Voltage on the Transmitting Coil
- Operating Modes Status Indicators
- APPLICATIONS
- WPC Compliant Contactless Charging Stations
- Other Wireless Power Base Stations and Transmitters
Thermal Protection
The bq500110 can provide thermal protection to the transmitter. The external NTC resistor can be placed in the most thermally challenged area, which usually is the center of the transmitting coil, and connected between VCC and the dedicated pin 3. The threshold on the pin 3 is set 1.25V. The NTC resistor and the resistor from the pin 3 to GND create temperature sensitive divider. User has full flexibility choosing the NTC resistor and the value of the resistor from the pin 3 to GND to set the desired temperature when system shuts down.
Audible Notification on Initiation of Power Transfer
The bq500110 is capable of activating two types of buzzers to indicate power transfer begin. The pin 15 outputs the high logic signal for 0.5s which is suitable to activate DC type buzzers with built in tone generation, other types of sound generators, or custom indication systems. The pin 24 outputs 0.2s, 4000Hz square wave signal suitable for inexpensive AC type ceramic buzzers.
Non-Volatile Memory Error Correction Coding
The device uses Error Correcting Code (ECC) to improve data integrity and provide high reliability storage of Data Flash contents. ECC uses dedicated hardware to generate extra check bits for the user data as it is written into the Flash memory. This adds an additional six bits to each 32-bit memory word stored into the Flash array. These extra check bits, along with the hardware ECC algorithm, allow for any single bit error to be detected and corrected when the Data Flash is read. Note that the Data Flash configuration has been factory programmed and is not generally available for customization.
Metal Object Detection (MOD)
As a safety feature, the bq500110 can be configured to detect parasitic metal placed in the vicinity of the magnetic field. The bq500100 uses the power packet information (as received from the powered device) and measured transmitter input power to calculate parasitic losses in the system. When excessive power loss is detected, the device will light the red LED and provide a twenty second warning, and then will disable its PWM output. If the metal object is removed during this twenty second warning time, the normal operation will be restored. After shutdown, the bq500110 will attempt to restart normally after approximately five minutes. If theobject that caused excessive power dissipation is still present in close proximity to the field, the sequence will be repeated again and again.
