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
rechargable 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
This is a basic charger set, and it does work, providing 3.3V 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 (eg 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
Because it's 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
different valued output.
* Coils are 1.5"/38mm diameter
* Receiver weight: 5.5g
* Transmitter weight 5.7g … more
|Product type||Electronics module|
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