AC220V mains power is reduced by transformer T1 and supplied to the charging circuit after baid1-d4 full wave rectification. When the output terminal is connected to the set charged battery Dao according to 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 on through the collector current of Q, and the current charges the battery through the SCR.
When the pulsating voltage approaches the battery voltage, the thyristor turns off and stops charging. By adjusting R4, the on voltage of transistor Q can be adjusted. Generally, R4 can be adjusted from large to small so that Q can trigger thyristor (on). In the figure, the LED D5 is used as a power indicator, while D6 is used as a charging indicator.
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1. Basic overview
There are two ways to solve the problem. One is to use high-capacity batteries directly, and the other is to use fast charging technology.
2. Three elements of fast charging
To realize the fast charging function on mobile phones, three factors need to be met, and none of them is indispensable. Charger, battery, chargeic. The charger needs to meet sufficient output current and output voltage, because the wiring of the charger has a large parasitic resistance. If you want to achieve a large charging current, the on load output voltage of the charger needs to be high.
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