This Inductive Power Transfer Module lets you deliver power wirelessly across a small gap, making it a neat solution for enclosed projects, rotating assemblies, and applications where a direct wired connection isn't practical.
The squarish board with two chips on it is the transmitter (power with 9V). The longer board is the output and you can connect that to the part of your project that needs powering.
Inductive charging is a way of powering a device without a direct wire connection. Most people have seen inductive charging in a rechargeable electric toothbrush: you may have noticed that you recharge it by placing it into the holder, but there's no direct plug. These chargers work by taking a power transformer and splitting it in half, an AC waveform is generated into one, and couples into the second coil.
This is a basic charger set, and it does work, providing 5V DC output from the output half when the input half is powered with 9V to 12VDC. You can draw as much as ~500mA if the coils are 2 or 3 mm apart. If you only need 100 or 200mA you can be up 7mm apart. For 10mA draw, the coils can be up to half an inch (12.5mm) apart. Any non-ferrous/non-conductive material (e.g. air, wood, leather, plastic, paper, glass) can be used between the two coils. The material doesn't affect the distance or efficiency. The coils do need to be fairly co-axial, try to get them to be parallel and have the circles line up for best power-transfer. (This is why the electric toothbrush must fit into the plastic holder, it's lining up the two coils for best efficiency).
Because its an air-core transformer, it's fairly inefficient. Only about 40% of the energy in shows up on the other end, but for low power or charging project. If you draw 5V 100mA on the output side (0.5W), you'll need 0.5W * 2.5 / 9V = ~150mA from the input end. The quiescent current is about 70mA at all time, even when the other coil is not anywhere near by.
These are basic modules, probably used for some low cost toy. We don't have any datasheets or specifications for them. We do see a feedback resistor divider on the output side using 0603 SMT resistors so an advanced user could solder in different values to turn it into a 3.3V output.
Features
Inductive wireless charging set with transmitter and receiver coils
Input: 9V to 12V DC (transmitter board with 9V power connector)
Output: 5V DC from receiver board
Maximum output current: ~500mA at 2-3mm coil separation
100-200mA output available at up to 7mm separation
10mA output possible at up to 12.5mm separation
Works through non-conductive materials (plastic, wood, leather, paper, glass, air)
Approximately 40% power efficiency
Quiescent current draw: ~70mA on input side
Coils must be parallel and co-axial for optimal power transfer
Modifiable output voltage with soldered SMT resistor adjustments
