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30w fast charging 27w mobile phones should be no problem, and the charging head with large power can fully meet the charging needs of small power mobile phones. However, whether it can achieve fast charging, not only depends on the power, but also depends on whether the fast charging protocol matches. At present, the commonly used fast charge protocols are as follows, usb pd, Qualcomm qc, Mediatek pe, oppo Fast charge and Huawei Fast charge and so on. Some chargers support more than one fast charging protocol.