Eggtronic 15W Qi1.3 Wireless Power Solution
Eggtronic is one of the Wireless charging systems technology leaders with multiple patents, expertise of in-car integration for wireless technology, WPC Member since 2016 with designs released to production.
Apple 7.5W charge with Eggtronic chargers perform better when compared to comparable to Apple MagSafe charge times – magnets in MagSafe enable easy alignment but tend to heat up once alignment is off. With Eggtronic Apple Fast Charge is achievable keeping the phone cold.
Eggtronic has patented a Ferrite shield able to deflect the magnetic flux avoiding overheating of the magnets which ensures fast charge and avoids FOD issues.
Eggtronic Microchip dsPICC33 based Wireless Charging:
- Single microcontroller architecture, dual core (Main-Secondary)
- Class E power conversion architecture for optimal performance
- Ready to support Qi 1.3 specification
- NFC for credit card protection
- Designed for up to 8 mm coil-to-coil distance (up to 4mm pad thickness).
Key Features:
- Patented coil driving system to reduce EMI to meet class 5 CISPR 25
- Buck-Boost topology ensuring always 15W power, peak efficiency 75%
- Patented iPhone 12 charge booster
- Active Cooling (Fan)
- Dedicated Pad for air circulation and shielding.
Summary of key benefits of Eggtronic and Microchip Solution as developed:
- Ability to implement software based digital demodulation resulting in minimal component count and low BOM cost
- Programmable solution to support multiple Qi topologies
- Implement proprietary protocol when requirement arises
- Support different system requirement for each OEM
- Ability to separate functionality between cores and execute instructions in parallel (Qi protocol, NFC, CAN/LIN)
- Integrated op-amps enable optimization of system BOM.
- Integrate into the automotive environment and transmit data to the CAN/LIN bus for diagnostics/improved user experience
- Drive the full bridge power stage
- Control the front-end regulator for supporting 6-19V input voltage range for automotive application
- Automotive in-car charging reliability
- Implement Qi, NFC Stack, AUTOSAR Stack others.
Eggtronic Triple Coil Embedded System
The “Triple coil embedded system” is a wireless charging module designed to be integrated in any surface. Using the provided adhesive mounting tape, it can be installed under slim surfaces (maximum 5 mm thickness). No need for screws: the installation process is quick and easy, and the charger can be removed without damaging the top. The “Triple coil embedded system” embeds a Qi certified chipset: it is compatible with the WPC Qi 1.2.4 wireless charging standard and works with any Qi-compliant device. A triple-coil system ensures high positioning freedom. The “Triple coil embedded system” is designed in two variants. The Variant 01 has two power input signals, the Variant 02 has two power input signals and one output Status Signal (SS). The SS is controlled by the system and its function is to indicate if a device is in charge (3.3V output) or not (Open Drain – HiZ output).
- Compatible with WPC Qi 1.2.4 wireless charging standard.
- Designed for integration: a completely hidden solution.
- Industrial adhesive mounting tape, no need for screws.
- Quick and practical installation process, easy charger removal without damaging the top.
- Maximum power 5W.
- Triple coil free positioning technology allows wider charging area compared to standard solutions.
- Designed to be installed under surfaces with maximum thickness of 5 mm (0.19 in).
Eggtronic Wireless Charging Module
Key Features:
- Wireless charging Qi 1.2.4 compliant
- Three Transmitting Coils
- Each coil can charge up to 15W independently
- Supporting Baseline Power Profile (BPP),
- Samsung Fast Charge protocol (from 2019 part of official Qi Specs)
- Extended Power Profile (EPP).
- Apple Fast Charge up 7.5W
- Compact and integrated solution for driving
- MP-A13 charging topology, specific designed for fixed frequency and low EMI
- Vehicle interface via LIN or CAN depending on the OEM requirement.
- UDS Diagnostic protocol
- Custom information to vehicle on status, real time power transmitted and Qi phone ID
Buck-Boost & Class E – Final stage:
- Buck-Boost supply the Class E with Vrail voltage such that the wireless charger can transmit 15W to loads with distances in the range of [2 – 8] mm.
- Class E provide a quasi-sinusoidal wave to the load with great efficiency. It means less Radiated Emission
System Architecture:
Primary design is for Automotive Applications.
- NFC has been put to protect the credit cards (optional).
- External EEprom can be removed if there are Microchip SW libraries which can emulate EEprom memory
- If the automotive part will be removed, also the dsPIC33 will be a single core device.
Suggested installation:
- Rubber pad over the charger surface thickness (typical) 1.5mm
- Fixing screw suggested: CSPPNW-SUS-M4-14
- Charging area 190 mm x 86 mm
Electrical and Operating Condition:
- The WCM is intended to be connected directly to the car bus, automatically waking up once LIN traffic has been detected
- The charger is able to withstand electrical stress and loads from ISO 7637-2 & ISO 16750-2 Transients
- Load dump with centralize suppression up to 35V.
- Ambient Operating Conditions:
- WCM has been design to work in harsh condition for in-cabin application.
- A thermal shuts down is provided to prevent overheating of the phone and ensure user’s safety.
- Thermal drift is indeed controlled by power throttling, decreasing gradually the power transferred when the receiver device is heating up.
Wireless Charging routine Operation/ Other Details:
Routine operations compliant to WPC (Wireless Power Consortium) specification. In normal operating condition the charger basically execute the following 3 actions:
- 3 x Digital ping (100ms on each coil, amplitude is scaled to coil-to-interface distance), 40 ms to switch coil;
- 5 x Analog ping (few millisecond on each coil every 333 ms) to detect quickly object presence on the charger;
- 3 x Q-measurement on each coil mandatory for Medium Power Transmitter.
- Power loss FOD is based on Power RX – Power TX difference called Power Loss.
- If this one becomes high a Metal Object has been placed between the Tx and the Rx and the Tx stops the charge.
- The Tx needs to be tuned by setting threshold value according to different output power levels from 0 to 15 W.
- WCM must measure for the presence of a Foreign Objects (FOs) prior to power transfer commencing. This measurement is taken during the Q-measurement test (‘Q’).
- If the Q-factor is greater than the internal threshold (set by the manufacturer specific to the HW configuration), the WCM will generate the digital ping to determine if the object is a WPC compatible Rx in an attempt to power the RX
- Each EPP Rx has its own calibrate Q-factor (based on Power Transmitter’s Primary Coil
- Before being powered up the Rx share its own Q-factor with the Tx. The Tx compute the Rx Q-factor and compares it with its own value, whether the difference is below the threshold there will be a Foreign Object and the charge doesn’t even start.
For More Informations Contact Matteo Ovi matteo.ovi@eggtronic.com or designhmi@gmail.com
