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Lithium Ion (Li-Ion) Battery charger

2016-05-10 04:17  
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Lithium Ion (Li-Ion) Battery charger
We can charge Ni-Cd or Ni-MH simply by placing a series resistor to limit current from the power source to make efficient loading. But not so with lithium ion cell (Li-Ion) which has a capacity greater than ever and don’t need to be completely discharged to charge them, but require a strictly controlled charging. If we talk about the lithium ion cell is charged a third time against a pack of Ni-MH or one-sixth of the same cadmium. But this requires a relatively high supply current to the cell during the charging process and must be provided in the rails pulse control. In this type of battery charging uncontrolled drip (common in alarm systems, for example) or the load resistor in series with the power lead, without exception, It will destroy itself But there are a number of active components, semiconductors, capable of carrying the load, control and maintenance of these cells with almost no additional external components. In the diagram we see the circuit typical Li-Ion battery charger, where it finds that it is easier to make a performance similar to discrete electronics. This chip is responsible for measuring the state of the battery (through its terminal FeedBack) and sent by the control voltage output terminal (Out). The capacitor allow to Serve as parasites RF filter and potentiometer 50 to adjust the system according to the operating voltage of the cell.