Slow charging with weak power supply

USB-C PD enables a gentle charging of the battery by using a weak power supply. This is not allowed with a conventional power supply!






  Civilized interaction between charger and consumer


Conventionally, it would go like this. The notebook wants 65 watts at 20 volts. But the power supply can only deliver 30 watts. So the 30 watt power supply either supplies 65 watts until it self-destructs or it only supplies 15 volts and the notebook switches to battery mode because the voltage is too low.

The situation is completely different with USB-C PD. The power supply and the consumer agree on the possibilities. If the power supply says “I can only supply 1.5 A at 20 V”, then the notebook follows suit.

  Fast charging is nice, but not always useful


Fast charging leads to faster battery degradation. Charging a 46 Wh battery with 65 watts is fast charging. There is nothing in the settings to limit the charging current. So only a weaker power supply helps. If this 30 watt power supply only supplies 30 watts and the notebook's operation requires 5 to 10 watts, then only a gentle 20 to 25 watts are left for charging.

To the power supply

  Notebook complains about weaker power supply


Slow charging with weak power supply USB-C PD enables a gentle charging of the battery by using a weak power supply. This is not allowed with a conventional power supply! Picture 1

At startup, the notebook complains that a weaker power supply is connected, press ESC and it continues. The battery level can drop at 100% CPU load with a weak power supply.

This realization and the 12 volt surprise only made it possible to buy the powerbanks with only 20 watts and only 12 volts.



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