First, the subject is different
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1, fast charge: A charging method that can make the battery reach or close to a fully charged state within 1 ~ 5h.
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2, slow charge: refers to the process of supplementing the battery and other equipment.
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Second, the principle is different
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1, fast charge: when the output end is connected to the charged bottle set by the correct polarity, if each half wave peak of the rectified output pulsating voltage exceeds the output voltage of the battery, the SCR is triggered by the collector current of Q, and the electricity flows through the thyristor to charge the battery.
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2, slow charge: the principle is to let the direct current pass from the opposite direction of discharge to restore the active substance in the battery. Three, different circuit characteristics
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1, fast charge: If the two output terminals are short circuited, the thyristor SCR trigger circuit in the charger cannot work, so the thyristor is not on, and the output current is zero.
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2, slow charge: when using the battery is mistakenly connected to the positive and negative terminals, then the thyristor trigger circuit reverse cut-off, no trigger signal, thyristor is not on, the output current is zero.
There is a difference, the fast charging power is higher, the charging speed is faster, the ordinary slow charging speed is slow, the power is low.
Apple's fast charge is 50 percent full for 30 minutes, and when it is nearly 80 percent full, it enters the trickle charge. Fast charge power is about 18w or 20w, slow charge is only 5w quite slow!