Mouser Electronics is stocking Qi-compliant products in support of the movement toward global standards for interoperability between wireless power transmitters and wireless power receivers.
The continual surge of wireless products into the market has created both convenience and a tangle of charging cables and connectors. While we love the freedom of wireless technologies, we are still tied to ugly charging wires. To make matters worse, we usually have a specific charging requirement for every wireless device that we use, creating a drawer full of cables, transformers, adapters, and connectors.
Qi technology is improving the wireless charging method by removing the cables. The fact is that power transfer can be accomplished over short distances without wires. The Wireless Power Consortium consists of independent companies that set international standards for interoperable wireless charging. The main idea is that wireless products designed with Qi-compliant parts will charge on other Qi charging stations, regardless of manufacturer, model, or country, thereby giving end users the confidence to purchase products bearing the Qi logo. In addition, it provides design engineers with an accepted set of interface specifications, freeing them to concentrate on product differentiation and competition.
How it works
Short distance power transmission is usually based on the principle of magnetic induction. Needed are two coils, a transmitter coil and a receiver coil. An alternating current in the transmitter coil generates a magnetic field which induces a voltage in the receiver coil. This voltage can be used to power a mobile device or charge a battery.
The coupling is determined by the distance between the inductors (z) and the relative size (D2 /D). The coupling is further determined by the shape of the coils and the angle between them (not shown).
Total energy consumption
Plugged-in battery chargers are typically left plugged-in continuously, thereby making standby power consumption significant. With the assumption that wireless battery chargers will also be left plugged-in, Qi has continually minimized standby power consumption. Wireless charging efficiency can be as high as 70% and possibly higher if high quality components are used. A wireless power transmitter can be more or less efficient than the wired chargers it replaces, depending on the number of wired chargers that are being replaced, the type of chargers, and the habits of the owner.
The efficiency of the power transfer depends on the coupling (k) between the inductors and their quality (Q). The losses can be expressed as:
and graphically shown as:
Electromagnetic Fields and Shielding
WPC Qi products use electromagnetic waves within the marked non-ionizing area of the electromagnetic spectrum. Non-ionizing means that the energy of those waves is too low to ionize human tissues.
Integrated Device Technology IDTP9030 is the industry's most highly integrated Qi-certified single-chip wireless power transmitter. IDT IDTP9030 wireless power transmitter IC has received full Qi certification by the Wireless Power Consortium (WPC). IDTP9030 wireless power transmitter is interoperable with any device meeting the WPC Qi standard, making this IDT single-chip IC ideal for designers of compact and cost-efficient Qi-compliant charging stations. Value-added proprietary features include advanced multi-layered Foreign Object Detection for safety, two-way secure authentication between base and mobile, and power delivery up to 7.5W for faster charging times.
Complementing the IDTP9030 transmitter is the IDTP9020 high-efficiency single-chip wireless power receiver. This IDT receiver integrates a high-efficiency synchronous full bridge rectifier, high efficiency synchronous buck converter, and control circuits used to modulate the load to transmit WPC compliant message packets to the transmitter station to optimize power delivery. Both the IDTP9030 and IDTP9020 are capable of multi-mode operation, supporting the Qi standard and proprietary formats. Built-in protocol detection enables dynamic switching between Qi and proprietary modes, creating seamless transitions and a trouble-free user experience. Evaluation kits are available for quick and easy evaluation of the IDTP9030 transmitter and IDTP9020 receiver.
TDK wireless charging coils for smart phones and other mobile devices employ a proprietary flexible thin metal magnetic sheet, achieving an industry-leading thickness of only 0.57mm. These TDK wireless power transfer coil units are ultra-thin, lightweight and highly resistant to shock. The design of the coils minimizes the tendency toward rising resistance and achieves a power transfer efficiency that meets the requirements of the WPC Qi standard. These TDK devices also have a low height and an output current of 0.5 to 0.6A.
Texas Instrumentsbq500210 is a Qi compliant wireless power dedicated digital controller that integrates the logic functions required to control wireless power transfer in a single channel WPC compliant contactless charging base station. The TI bq500210 Gen 2 Wireless Power Transmitter Manager is an intelligent device that periodically pings the surrounding environment for available devices to be powered, monitors all communication from the device being wirelessly powered, and adjusts power applied to the transmitter coil per feedback received from the powered device. The TI bq500210 also manages the fault conditions associated with the power transfer and controls the operating modes status indicator. The QI compliant Wireless Power Transmitter Manager also supports Parasitic Metal Object Detection that allows the controller to protect itself and the power receiver from excessive power loss and heat associated with parasitic metal objects placed in the power transfer path.
Texas Instruments BQ500211 Generation 2, Qi Compliant 5V Wireless Power Transmitter Manager is a second generation digital wireless power controller that integrates all functions required to control wireless power transfer to a single WPC compliant receiver. TI BQ500211 is designed for 5V systems and safely engages a WPC compliant device, receives packet communication from the powered device, and manages the power transfer. This TI wireless power transmitter manager maximizes flexibility in wireless power applications by featuring Dynamic Power Limiting (DPL). DPL enhances user experience by seamlessly optimizing the usage of power available from limited input supplies.
Texas Instruments bq51011 Qi-Compliant Gen 2 Integrated Wirfeless Power Supply Receivers is designed for wireless power transfer in portable applications. TI bq51011 Qi Wireless Power Supply Receiver provides the AC/DC power conversion while integrating the digital control required to comply with the Qi v1.0 communication protocol. Together with the bq500210 transmitter controller, the TI bq51011 enables a complete contact-less power transfer system for a wireless power supply solution. By utilizing near-field inductive power transfer, the receiver coil embedded in the portable device receives the power transmitted by the transmitter coil via mutually coupled inductors. The AC signal from the receiver coil is then rectified and regulated to be used as a power supply for down-system electronics. The TI Qi-Compliant Wireless Power Supply Receiver is designed for use in WPC compliant receivers as well as cell phones, smart phones, headsets, digital camera, portable media players, and hand-held devices.
TI Evaluation Module:
Texas Instruments bq51013 Qi compliant wireless power supply receivers are advanced, integrated receiver ICs for wireless power transfer in portable applications. TI bq51013 wireless power supply receivers provide the AC/DC power conversion while integrating the digital control required to comply with the Qi v1.0 communication protocol. Together with the bq500110 transmitter controller, the bq51013 enables a complete contact-less power transfer system for a wireless power supply solution. TI bq51013 wireless power supply receivers provide 93% overall peak AC-DC efficiency. These TI devices are designed for use in a variety of applications, including WPC compliant receivers, cell phones and smart phones, headsets, digital cameras, portable media players, and hand-held devices.
Texas Instruments bq51013A Integrated Wireless Power Receiver Solution is an advanced, integrated, receiver IC for wireless power transfer in portable applications. TI bq51013A features dynamic efficiency scaling for optimized performance over any range of output power and adaptive communication limit for robust communication during high levels of load current noise. This TI receiver IC provides the AC/DC power conversion while integrating the digital control required to comply with the Qi v1.0 communication protocol. Together with the bq500210 transmitter controller, bq51013A enables a complete contact-less power transfer system for a wireless power supply solution. TI bq51013A wireless power supply receiver provides 93% overall peak AC-DC efficiency.
Texas Instruments bq5105x Wireless Power Receiver with Li-Ion/Li-Pol Battery Charge Controller for portable applications provides efficient AC/DC power conversion, integrates a digital controller required to comply with Qi v1.1 communication protocol, and includes all necessary control algorithms needed for efficient and safe Li-Ion and Li-Pol battery charger. TI bq5105x wireless power receiver together with bq500210 transmitter-side controller enables a complete wireless power transfer system for direct battery charger solution. By utilizing near-field inductive power transfer, the receiver coil embedded in the portable device can pick up the power transmitted by transmitter coil. The AC signal from the receiver coil is then rectified and conditioned to apply power directly to the battery.
First commercial wireless receiver coil for Qi-compliant devices!
Vishay / Dale IWAS Series Wireless Charging Receiving Coil/Shield offers the first commercially available wireless receiver coil for the WPC (Wireless Power Consortium) compliant devices. The Vishay / Dale IWAS Series Wireless Charging Receiving Coil/Shield provides 70% or greater efficiency and high permeability shielding for wireless charging receiving coils, and blocks charging flux from sensitive components or batteries. The IWAS Series Wireless Charging Receiving Coil/Shield performance is not adversely affected by permanent locating magnets.
New! IWAS-4832EC-50 available for 7V charging circuitry.
TI Transmitter IC:
TI Receiver IC:
The only manufacturer with both
a transmit coil and a receive coil on the market!
Wurth Electronics Wireless Power Charging Coils (WE-WPC)
allow power to be transferred wirelessly through an inductive coupling
at a short range of typically a few millimeters. The Wireless Power
Charging Coils from Wurth Electronics are Qi-standard compliant and
evaluated and approved from several IC manufacturers. The transmit coil
and the receive coils are inductively coupled, meaning the AC current in
the transmit coil generates a magnetic field which induces a voltage in
the receive coil to power a device. The magnetic field between the
coils is highly concentrated, exposing the user to only a small leakage
field which is further minimized by an EMI shield on the back of the
coil. The coils are winded with litz wire, instead of bifilar,
resulting in outstanding performance with the lowest DCRs and highest Q
values. When used together, the transmit coil and receive coil achieve
an efficiency of up to 75%.
NEW! Wurth has added additional options to the Qi wireless power charging coil (WPC) product line.
Semiconductor's NMLU1210 Dual 20V N-Channel MOSFET includes a dual 3.2A
Schottky Barrier Diode in a compact 4.0 x 4.0 x 0.5 mm µCool™ package.
Features of this N-Channel MOSFET include full-bridge rectifier block,
up to 3.2A operation, low RDS(on) MOSFET to minimize conduction loss, low gate charge, low VF
schottky diode, and ultra low inductance package. Typical applications
include wireless charging, AC-DC rectification, and power management
applications for portable products such as cell phones, PMP, DSC, GPS
and many others.