[Qi] Universal Wireless Charger Receiver Module 1000mA - Power limits: <0.5A

[rtek1000]

Hello,

I was researching on the wireless charging receiver modules. And some people have reported that the module heats up.

When checking the current capacity of a "Universal" receiver module, with a 10R load the voltage was only 4.8V and with 5R it dropped to about 3.4V. After a few moments, it was possible to notice that there were hot spots.

By keeping with the 5R load, in a short time the receiver module has stopped working and the transmitter can no longer recognize the presence of the receiver module.

That is, this receiver can not provide 1000mA as per its description.

But it may be useful for small circuits, or for charging batteries using a current limiter, such as the TP4056, as long as your original 1A reference resistor is replaced with another value (described in the datasheet, for example 5k Ohms)

This transmitter has 3 screws in the housing, and operates at a frequency of approximately 200kHz.

[rtek1000]

More about Wireless Charger (DIY):

Qi wireless power receiver from scratch

Communication protocol:

Bit encoding scheme
The Power Receiver shall use a differential bi-phase encoding scheme to modulate data bits onto the
Power Signal. For this purpose, the Power Receiver shall align each data bit to a full period tCLK of an internal clock signal, such that the start of a data bit coincides with the rising edge of the clock signal. This internal clock signal shall have a frequency