Wireless charging works by transferring energy from the charger to a receiver via electromagnetic induction. The charger uses an induction coil to create an alternating electromagnetic field, which the receiver coil converts back into electricity to be fed into a battery or directly to an application. Typically, the charger and receiver should be close and correctly aligned over the top of each other, although a set orientation is normally not necessary.
Developed by the Wireless Power Consortium, "Qi" is an open interface standard that defines wireless power transfer using inductive charging over distances of up to 4 cm. A Qi-based wireless charging system uses resonant inductive coupling to enable a charging pad to transfer power to a compatible device when it is placed on top of the pad.
Our dsPIC® Digital Signal Controllers (DSCs), with their multiple Pulse-Width Modulators (PWMs), high-speed Analog-to-Digital Converters (ADCs) and programmable core, are very effective in optimizing wireless charging solutions. To help jump start your development, we offer reference designs for 15W single- and multi-coil Qi-compliant transmitters.
For applications that may require higher wattage, we also offer the 200W/300W Wireless Power Reference Design that implements a proprietary protocol that is ideal for applications such as power tools, robotic vacuums, industrial slip rings, small electric vehicles and drones.
Wireless Reference Designs
Qi Wireless Power Micro-Receiver Reference Design
The Wireless Power Micro-Receiver allows you to quickly add wireless charging functionality to your project without having to deal with complex specific protocols or state machines. This receiver is implemented using a general-purpose 8-bit microcontroller and is a flexible, low-cost alternative to the common wireless charging solutions based on ASICs. The receiver is compatible with the Qi 1.1 (5W) standard and can be used in conjunction with any Qi 1.1-compatible wireless charging transmitters (all Qi 1.2 or higher compliant base stations are also backwards compatible with Qi 1.1).
The three coil wireless power transmitter is based on the dsPIC33CH128MP506 DSC and implements a fixed-frequency power control topology. The front-end buck-boost control is managed by the dsPIC33CH DSC. The transmitter includes CAN for ease of integration into the automotive environment. The transmitter also enables the implementation of Near Field Communication (NFC).
Would you like to learn more about the advantages of switching to digital power supplies? Click on the link below to download our Features, Value and Benefits of Digital Control for Power Supplies white paper.
dsPIC Digital Signal Controllers
|Product||Core||Number of Pins||Program Flash (KB)||RAM (KB)||IC/OC/|
|SMPS PWM||ADCs||Number of Op Amps/ PGAs||Number of Analog Comparators||Number of UART/I2C/|
|dsPIC33EP 'GS' Family||70 MIPS Single Core||Up to 80||Up to 128||Up to 8||4/4||16 Channels 1 nS||22 × 12-bit, 5x S/H||2||4x||2/2/3|
|dsPIC33CK 'MP' Family||100 MIPS Single Core||Up to 80||Up to 256||Up to 24||9||16 Channels 250 pS||24 × 12-bit,|
|dsPIC33CH 'MP' Family||100 MIPS Dual Core||Up to 80||Up to 512/72||Up to 48 + 16||8 + 4||8+4 Channels 250 pS||18 × 12-bit, 4x S/H||3||3||3/3/3|
IC = Input Capture
OC = Output Compare
MCCP = Multiple Capture/Compare/PWM
SCCP = Single Capture/Compare/PWM
SMPS PWM = Power Supply Pulse Width Modulation
- MAQ5281 – High-performance, low dropout regulator, 25 mA, 120V, adjustable Vout from 1.27 to 5.5V.
- MCP1790 – 30V, 70 mA, load dump protected linear voltage regulator
- MCP16311 – 30V, 1A PFM/PWM high-efficiency synchronous buck regulator
- MCP16331 – 50V 1A non-synchronous buck regulator
- ATA6562 – High-speed CAN FD transceiver with standby and silent mode and WUP
- MCP2561FD – High-speed CAN FD transceiver with standby mode and SPLIT pin
- ATA6570 – High-speed CAN FD transceiver with Partial Networking
- MCP9700A – Low-power linear active thermistor IC, analog output
- MCP9800 – 2-wire high-accuracy temperature sensor, digital output
- MCP9504 – Temperature switch with selectable hysteresis
- MIC4607 – 85V, three-phase MOSFET driver with adaptive dead-time, anti-shoot-through and overcurrent protection