12 Jun The Ultimate Guide to Wireless Charging

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The Ultimate Guide to Wireless Charging

Wireless charging is to transfer power through non-conductive means (usually using magnetic field as a bridge for power transfer).

The transmitter station is directly connected to power source
The receiver mobile is put on the active area of station surface for charging
Magnetic Induction (MI): Transmitter coil that creates a magnetic field; receiver coil picks up the magnetic field and generates electric current.
Magnetic Resonance (MR): Both transmitter and receiver coils operate at approximately same natural frequencies.

When the main circuit parameters are determined, circuit gain versus frequency change under a certain load.
When Fn > 1 , System operates in inductive l oad range
Wnen Fn < 1 , System operates in capacitive l oad range
Resonance Frequency calculation
𝐹𝑛=1/2𝜋𝐿𝐶

−Contains one, or more transmitters

−Transmitter provides power to receiver

−Contains a receiver that provides power to a load (e.g. a battery)

−Receiver provides control information to transmitter

− To the need of the mobile device (required power)

− To the desired operation point (e.g. output current, voltage)

− To the need of the receiver (required power)

− To the desired operation point (e.g. primary coil current)

−To provide control and device information to the transmitter by load modulation on the power signal

−To receive the device information from the transmitter by de-modulation (to be added in Qi v1.2)

−To receive control and device information from the receiver by de-modulation

−To provide device information to the receiver by frequency modulation on the power signal (to be added in v1.2)