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Simple type nickel cadmium battery charger

2016-05-11 20:21  
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Simple type nickel cadmium battery charger
Simple type nickel cadmium battery charger
If you open the switch K, the 220V AC city electricity will be transformed by the transformer B, then the current is rectified by D1-D4 to charge the two GNY0.5 type battery (Number five nickel cadmium battery), the current is 500mA. The light of D6 means it is charging, at this time, the open voltage of the TWH8778 switching integrated circuit's control electrode pin-5 is lower than 1.6V, the circuit can not be conducted, so D5 will not turn on. As the continuation of the charge, the charging current of the GNY battery decreases gradually, the port voltage of the battery increases gradually, the voltage of the TWH8778's control electrode pin-5 increases gradually too, when the voltage is equal to 1.6V, the circuit conducts, D5 turns on to indicate that the battery is full.