I'm trying to charge my Lenovo IdeaPad Gaming 3 laptop using a phone charger that outputs 12V (9.1A max) and using a PD trigger to step it up to 20V, which I then feed into a 65W PD module. I've confirmed with a multimeter that I'm getting 20V, but the laptop just won't accept it. I initially thought it was a connector issue, as I successfully powered the laptop with a 19V source using the same resistor configuration. After testing several PD modules and trigger boards, it still refuses to charge when using the PD configuration, but it works fine if I connect a direct 20V source. The laptop's charging indicator blinks orange when I try with the PD setup, indicating a possible input issue. I'm not sure what I'm missing here.
2 Answers
It sounds like you might be overcomplicating your setup with the multiple conversions. Have you checked if the boost converter is stable under load? A lot of cheaper models can drop voltage when a load is applied, which might be causing the issue. Try measuring the voltage while under load to see if that's the case.
Most laptops have some checks in place to verify that the charger is compatible. If you’re just applying straight DC, they might not accept it. The blinking light on your laptop could indicate that it's not recognizing the charger properly—like it’s not receiving the expected data. Have you checked that the resistance setup is correct? It can be finicky with some setups.
I'm using a 1k ohm resistor as per the specs for the stock charger, which seems to work fine. But the issue arises whenever I connect through the PD module. It’s odd because everything looks good on my multimeter, showing a consistent 20V output.
Yeah, I noticed a similar problem with my boost converter. It kept the voltage fine until I connected it to my laptop, and then it dropped way too low. Also, make sure your PD modules are working correctly at the required amperage.