MIKROE Qi Receiver Click

MIKROE Qi Receiver Click is based on the P9025AC 5W Qi wireless power receiver integrated circuit with the advanced Foreign Object Detection (FOD) feature from IDT. The click utilizes the principles of the inductive coupling for the purpose of wireless power transfer. Recently the WPS Qi wireless power transfer standard is becoming widely used for example - wireless charging of the batteries on many Qi wireless power charging compliant devices. Qi Receiver Click is well-suited for a wide range of applications including cell phones tablets PC peripherals medical devices small hand-held devices in robotics embedded electronics etc. Note: Qi Receiver Click has to be placed near the suitable Qi Transmitter also known as the charging pad to successfully harvest the transmitted power. Follow these simple steps to power-up and begin using Qi Receiver click: Place the Qi Receiver click so that the inductive coil is facing down towards the transmitter. Verify that the STAT LED is illuminated - power is being transferred. Connect the load to the output pads. The Click utilizes the effects of the electromagnetic induction to wirelessly transfer energy a phenomenon in which the electromotive force (i.e. voltage) is generated across the electrical conductor under the influence of a variable magnetic field. It uses the planar copper coil as an inductive element. Qi Receiver Click relies on the wireless power transfer standard developed by the Wireless Power Consortium to both provide and monitor current and voltage. This standard involves digital communication used to transmit the information back to the charging pad. Depending on the received information packets charging pad regulates the strength of the variable magnetic field which in return generates more or less power on the receiver coil. When Qi Receiver Click is placed on a WPS Qi compliant charging pad it responds to the transmitter's "ping" signal by rectifying the AC power from the transmitter and storing it on a capacitor connected to the VRECT. During the "ping" phase the rectifier provides about 5V at the VRECT pin. An internal linear voltage regulator provides the supply voltage for the digital section of the P9025AC enabling the Qi protocol communication so that the receiver can synchronize with the charging pad. After the initial synchronization the system enters the Power Transfer state and the actual power transfer process is started which is indicated by the Status LED. The voltage on the output connector of the Qi Receiver click is kept constant and it’s 5.3V so the eventual voltage drops under a heavy load are accounted for. Since the P9025AC can withstand up to 5W it should be able to deliver up to 1A of current on the output header VOUT. One special feature of this device is the possibility to detect foreign metal objects in its field. The presence of the foreign metallic objects in the charging field can be unwanted - even dangerous. When found in the alternating magnetic field the metal object can be heated up by the eddy currents that are generated inside of it. Also this heat can be translated into a power loss which can be especially problematic if the object is actually a part of the power harvesting device. To overcome this problem the P9025AC employs advanced FOD techniques to both accurately measure its received power and to accurately compensate all of its known losses. This compensation is implemented by means of a curve fitting table. This table supports up to 10 different curves stored in OTP (One Time Programmable) memory and one volatile memory location programmed by the I2C bus. Additionally the selected fitting curve can be offset by 300mW by the means of a resistor connected to the FOD2 pin so even better power adaptation can be achieved. The Click also features the overvoltage overcurrent and thermal shutdown. If any of these conditions occur on the output terminal the LDO gets shut down and the End of Power packet is sent so the charging pad also stops transmitting the power. Additionally an interrupt can be generated on the INT pin of the Proximity 3 click. Note: This device can’t be used to charge the batteries on its own. It can be coupled with the specialized battery charging circuitry as for example Charger click so that the harvested power can be used for battery charging too.