A simple charger for Li-Ion batteries. Scheme, description

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A simple charger for Li-Ion batteries. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Chargers, batteries, galvanic cells

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The proposed circuit is a charger for charging Li-Ion batteries with a nominal voltage of 7,4 V.

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LEDs D5-1, D5-2 serve to indicate the state of the battery during charging. The red LED indicates the battery charge (current flow) and the green one indicates the end of the charge cycle, the current is less than 20-30 mA. Resistor R16 sets the maximum charge voltage at the junction point of diodes D5, D7. Typically, for two cells in series, it is 8,4 V.

Using the charger involves connecting a lithium-ion battery protected by a protection board, usually supplied by the battery supplier. The charge current is limited by the value of the resistance R9.

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