快充提高充电速度的理解

快充提高充电速度的理解

所有的快充包括PD充电功率都是指的TYPEC端输入的功率，并不是受电端负载的功率，不是电池端的充电功率，那好比输入端大功率140W是打水管，受电端是小的水龙头。水龙头类比于电池端的充电功率，既然小水龙头决定了水流的速度，那不管TYPEC端是多大的功率，按理水龙头的大水流速度是一样的，并没有因为输入端水管大就会导致水龙头的水流大。那TYPEC快充是如何提高充电速度的呢

快充，没电也快

快充的前提是电池，现在的电池都在4-5AH，还支持高C倍率。比如3C,5AH电池，最大功率到55W。快充技术真正解决是怎么把这么大的功率从电源端送到电池端。要么提高电压（电池端需要降压散热，但对线材要求低），要么提高电流（压力在电源端和线材要求）。然后是需要多大的电压或电流，这就是快充握手协议在解决的问题。

ughbss 发表于 2025-3-6 15:09
快充的前提是电池，现在的电池都在4-5AH，还支持高C倍率。比如3C,5AH电池，最大功率到55W。快充技术真正解 ...

电池端的电压并没有上去

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我认为的手机快充的底层逻辑
1：使用高效的电荷泵替代DCDC的电感降压模式解决效率和发热问题(CC阶段）,同时提高输入电压（2X或4X电池电压）解决线损问题。
2：使用PD协议PPS动态调节电压，降低压差，降低充电电路热量。

核心逻辑：提高效率，热量外引

不管怎么说，根据能量守恒，电源充电功率 *效率 = 电池充电功率。
假设电源为20V*5A=100W，效率90%，则电池充电功率就是90W。

aaron880310 发表于 2025-3-6 18:32
ximalaya.com/soun&#10 ...

WCNMLGB

coody 发表于 2025-3-7 15:18
不管怎么说，根据能量守恒，电源充电功率 *效率 = 电池充电功率。
假设电源为20V*5A=100W，效率90%，则电池 ...

这个理解到位