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Programmable automatic charger circuit

2015-03-18 14:35  
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Programmable automatic charger circuit
Working principle The circuit diagram is shown in diagram 4-26. The electric supply is bucked by transformer, rectified bydiode, filtered bycapacitor to output 18V pulse voltage, then it outputs 12V steady voltage through three terminal regulator W7812 after it outputs 18V pulse voltage. VD1 is used for working indication. Decade counter CD4017 etc makesup thecharging, discharging driver circuit. CP end is added 50Hz AC signal. Output ends Q0~Q9 appear high level one by one. V1 etc makes up charge executive switch; V2 makes up the discharge execute switch; V3, V4, VD9 etc make up battery charger indicator and power-off executive switch. When CD4017's output ends Q1~Q5 output high level, V1 is turned on, and the circuit starts to charge to battery pack. When Q6 outputs high level, V2 is turned on, battery pack starts to discharge. When Q9 outputs high level, V3, V4 start to detect the charge voltage. When battery pack is full charged, V3 is turned on, LED VD9 is lit. It indicates that battery is full charging. Meanwhile V4 is turned on. CD4017's pulse input end will be forbidden, Q9 will keep high level and do not change. It offers trickle charge only by R7. If battery is not full charged, V3, V4are failure to actuate, CD4017 will work on.