The battery voltage regulation charger circuit

Published:2011/7/18 1:56:00 Author:TaoXi | Keyword: battery, voltage, regulation, charger | From:SeekIC

As the figure 3-9 shows, the circuit uses the 555 as the comparator to control the charging current of the nickel cadmium battery. The input of pin-5 is stabilized at 5.1V by the zener diode VD2 that can be used as the reference voltage. If the voltage of rechargeable battery is lower than 2.55V, the 555 will be triggered, the output of pin-3 will be the high level, and it charges the battery through the 100Ω resistance and the diode VD1. At this time the pin-7 will cut off, the LED turns on to indicate the charging state. When the voltage of rechargeable battery is higher than the threshold voltage of pin-5, the timer will reset to stop the charging, pin-7 will conduct and the LED will turn off. The threshold voltage can be set by the fine-tuning resistance RP2.



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