3.7V Lithium-ion battery charger with battery full indicator without IC
If battery is fully charged with 4.267v than RED LED turns off that means battery is fully charged. If you want fast charge your battery, you just change the resistor behind this diode. Also you can adjust which voltage you want to show battery is fully charged, just rotating the 1K veriable resistor.
This circuit Diagram is personal of AMKP40 technology [YouTube Channel]. If you have any questions about this circuit please comment below in the comment section.
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No indicate out put
ReplyDeletethe inductor is replaced with the 2.2 ohm resistor to limit the curent
DeleteYes, you are right.
DeleteThanks for comment ...💐💐🌹🌹
Hi, in video you show a 1.5K resistor. In schematic is a 5K resistor. Which one is correct?
DeleteSr,,,please diagram ko clear karke bataaye ,,,detail se diagram thik se samjh nahi aa raha hai 3 volt battery indicater ke liye.
ReplyDeleteIt is quite beneficial, although think about the facts when it reaches this target. inverter generator
ReplyDeleteThanks for comment ...🙏
DeleteHi, have a good day
ReplyDeletePlease can you send the diagram more detailed
It's a litte confuse
Regards
OK I will try to show you.
DeleteThank you for comment.
Is this suitable for 3.6v nimh battery??
ReplyDeletePeople who did not undertand the circuit please follow.
ReplyDeleteIn the circuit 1k, 1k VR, 3.7v zener and 1k is biasing the base of BC547 by voltage divider method. 1k resistor in the line of Red LED is working as collector resistor and also the Red LED driver resistor. 5k is the Green LED driver resistor. 2.2ohm resistor is also used to stabilize the circuit. IN4007 is used at the output so that battery does not discharge in this circuit by creating reverse biased mode.
Green LED is working as indicator of Power ON for the circuit. Depending on base current the collector current flows which in turn drives red LED On/OFF. Base current will increase/decrease on the basis of condition of charged/discharged battery in question. Correct me if I am wrong anywhere.
Hope this will help!
Little more addition to my above explanation: Also keep in mind that 2.2E resistor is ver y vital as while charging it becomes only resistor for charging the battery. Approx 1.5A current is provided to the battery because in forward biased condition 0.7v drop will come in picture. So, in my opinion 5V, 2A charger is preferable than 5V, 1A charger.
ReplyDeleteIf someone wants he/she can increase/decrease the value of 5K resistor because it is used only to limit the current through Green LED.
Working principle of this circuit:
Whenever 5V dc is supplied to the circuit, Green LED turns ON to show power on of the circuit.
Now, let us assume there is no battery connected for charging. In this condition base will have full current, thus collector current will flow. Here,red LED will be brightly glowing. When a low charged battery will be connected, battery will start charging through path 2.2E and IN4007 diode, thereby cutting off base current, hence no Red LED glowing. As and when battery will gradually be reached to full charged condition, the current which was going to battery for charging will now stop that path and start flowing through baseof transistor. In this condition battery will be fully charged as indicated by bright LED glow.
Hope I could explain. If I am wrong anywhere please bring to my notice.
Thank you!
A small rectification to my post. when transistor will conduct, Red LED will be OFF and at the same time battery will be fully charged. And when battery will start charging transistor will stop conduction and red LED will be ON.
DeletePlease i sew one diode IN4007 where is the second diode?
ReplyDeleteHello friend. Pls. aap apne circuit component soldering detail me dekhao. Any circuit. Pls.
ReplyDeleteIt is an excellent idea AMKP40 technology & beneficial also, is it beneficial for Electric motor battery charger? If yes then reply..... Thank you for this blog.
ReplyDeleteThis circuit only for 3.7v lithium ion batteries.
DeleteThank you for comment.
Sir ji, up circuit ki parallel mein 2 IN 4007 diode use kiye hai !lekin circuit diagram main up ek hi diode dikhaye hai ? Up Thora clear kor dene se achha hota ? My very best wishes for your such type of important video as well as all your upcoming videos.
ReplyDeleteKiu ki mae ek sath bahoot sare battery ko charge karna chahata hoon
DeleteIsh Circuit mein up jo PCB use kiya hai ! Uo up kahan se mangaye hai ? aisa bara hole wale PCB hame nohi mil raha hai? Please help me to get this product. Thanks for your video.
Delete