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spkirankumar
Joined: 27 Jun 2007
Posts: 4
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 27 Jun 2007 13:36 tea1104 schematic |
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I want to use a contant current source to charge 2 NiMH batteries (1.2V each) which are connected in series, using 5V input voltage. I want to control the charging current using PWM of the frequency 100 HZ from microcontroller. Please reply me with the circuit....
Last edited by spkirankumar on 28 Jun 2007 11:52; edited 1 time in total |
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27 Jun 2007 13:36 Ads |
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IanP
Joined: 05 Oct 2004
Posts: 6490
Helped: 1542
Location: West Coast
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27 Jun 2007 15:58 Re: Need a NiMH battery charger CKT |
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Here is a circuit that, using PWM, sinks 4-20mA:
http://www.edaboard.com/viewtopic.php?t=163559
It can be easily modified to become constant current battery charger ..
Regards,
IanP
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vaibhav.k
Joined: 12 Apr 2006
Posts: 117
Helped: 6
Location: India
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28 Jun 2007 5:55 Need a NiMH battery charger CKT |
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Why dont use chargers for it.
U can use NXP's TEA1104 or Texas bq2000.
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spkirankumar
Joined: 27 Jun 2007
Posts: 4
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28 Jun 2007 11:51 Re: Need a NiMH battery charger CKT |
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| vai wrote: |
Why dont use chargers for it.
U can use NXP's TEA1104 or Texas bq2000. |
I can use this IC's for NiMH charging. But my requirement is to build a constant current source using transistor and to vary the output current using pulse width. I am using PIC microcontroller in my application. So i am using same PIC to sense the battery voltage, according battery voltage i like to vary the charging current. If i get any IC, in which output current can be controlled by PWM, is OK.
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shoaibali
Joined: 28 Jun 2007
Posts: 40
Helped: 3
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28 Jun 2007 12:19 Re: Need a NiMH battery charger CKT |
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Check out MAX712/713 and DS2715.
These seem to provide simple NiMH battery charging solutions.
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