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Jana-Marie / Otter-Iron-PRO

USB-PD soldering station for JBC C245 handles.
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Some questions #23

Closed Hysen-ZHANG closed 3 years ago

Hysen-ZHANG commented 3 years ago

Hi Jan, I have some questions:

  1. Why is there a large capacitor(1000uF) on the control board ?
  2. I know the resistance of the soldering iron tip is 3 ohms, the current of soldering iron is 20V/3Ω=6.67A, Will it cause the PD power supply to enter the OVP state ？ Thanks.😀
Jana-Marie commented 3 years ago

Hey! The caps purpose is to smooth out the current spikes to prevent an OVP state. This isn't an elegant solution nor does it work well. A buck topology can be implemented by assembling L1, however I never did that. :D

Hysen-ZHANG commented 3 years ago

OK and thanks for your answer.