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Author Topic: 9V NiMH battery charging circuit  (Read 10607 times)

Offline iking

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9V NiMH battery charging circuit
« on: December 16, 2009, 05:14:12 PM »
tama po ba itong schematic ko for 9V? nasearch ko lang din po ito sa google.

may mga dapat pa po ba baguhin?



TIA!  ;)
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9V NiMH battery charging circuit
« on: December 16, 2009, 05:14:12 PM »

Offline nucleus

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Re: 9V NiMH battery charging circuit
« Reply #1 on: December 16, 2009, 05:32:45 PM »
tama po ba itong schematic ko for 9V? nasearch ko lang din po ito sa google.

may mga dapat pa po ba baguhin?



TIA!  ;)

circuit po iyan ng UPS, kung gagamitin lang na charger pwede nang alisin ung D2,D3,C2,C3 tsaka IC2 :)
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Re: 9V NiMH battery charging circuit
« Reply #1 on: December 16, 2009, 05:32:45 PM »

Offline iking

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Re: 9V NiMH battery charging circuit
« Reply #2 on: December 16, 2009, 06:07:25 PM »
thanks! ;D

yup pang 9V lang po.. ung C1 na 10uF 25V tantalum ung sa nahuha kung schematic nito.. wala ako nakita available sa raon. ano pwede alternative? kahit electrolytic ok lang?

nakita ko lang kasi to circuit ng portable headphone amplifier. hehe..

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Re: 9V NiMH battery charging circuit
« Reply #2 on: December 16, 2009, 06:07:25 PM »

Offline nucleus

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Re: 9V NiMH battery charging circuit
« Reply #3 on: December 16, 2009, 06:11:29 PM »
thanks! ;D

yup pang 9V lang po.. ung C1 na 10uF 25V tantalum ung sa nahuha kung schematic nito.. wala ako nakita available sa raon. ano pwede alternative? kahit electrolytic ok lang?

nakita ko lang kasi to circuit ng portable headphone amplifier. hehe..



pwede na yung electrolytic, kaya lang naman tantalum yung nilagay sa orig circuit dahil audio ang application
Hi! I'm nucleus and i carry the charge 8)

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Re: 9V NiMH battery charging circuit
« Reply #3 on: December 16, 2009, 06:11:29 PM »

Offline kontra13

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Re: 9V NiMH battery charging circuit
« Reply #4 on: December 16, 2009, 06:20:22 PM »
go sis! hehe ;D

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Re: 9V NiMH battery charging circuit
« Reply #4 on: December 16, 2009, 06:20:22 PM »

Offline iking

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Re: 9V NiMH battery charging circuit
« Reply #5 on: December 16, 2009, 06:52:37 PM »
hahaha.. bhadz, mahal kasi ng NiMH battery charger..

ah ok.. pwede ko na rin po ba sya gamitin sa kahit anong NiMH battery? tsaka gusto ko sana lalagyan ng battery full charged indicator.. pano ba un?



noob ako... :)
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Offline nucleus

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Re: 9V NiMH battery charging circuit
« Reply #6 on: December 16, 2009, 11:20:23 PM »
try mo po ito:



magkakaroon ng aprox. 2.49V-2.5V sa pin1 ng TL431 kapag umabot na sa 9.2V *full charge ng 9V battery* yung boltahe sa + ng battery na magpapaon sa TL431 at magpapailaw sa FULL indicator led :D :D

;)
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Offline rdpzycho

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Re: 9V NiMH battery charging circuit
« Reply #7 on: December 17, 2009, 12:04:38 AM »
NiMH ata charge niya, medyo flat ang voltage response nila. 7.2V din ang malamang na actual.
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Offline nucleus

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Re: 9V NiMH battery charging circuit
« Reply #8 on: December 17, 2009, 12:17:26 AM »
NiMH ata charge niya, medyo flat ang voltage response nila. 7.2V din ang malamang na actual.


7.2V po? dba't 9V yung battery so dapat 9.2V ang full charge? ???

EDIT:

ahhhhhh nga pala NiMH 1.2V per cell nga lang pala ito ano sir? 7.2V sa 6 cell , 9.6V sa 8 cell so dapat 9.6V pala ang pagtrigger ng FULL charge indicator :D
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Offline rdpzycho

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Re: 9V NiMH battery charging circuit
« Reply #9 on: December 17, 2009, 12:21:00 AM »
nope, 1.2V ang cell voltage ng NiMH, 6 cells in series ang 9V cell kaya 7.2V (9V sa alkaline dahil 1.5V per cell). medyo flat ang response ng NiMH, around 1.4V kapag full charge hanggang 50% to 70% used, bago bababa unti unti. tapos papatong naman ng 1.3V to 1.4V from full discharged to partial charge kaya complex ang detectors ng NiMH chargers.
‎"Divide each difficulty into as many parts as is feasible and necessary to resolve it."
- Rene Descartes

"For every difficult problem there is always a simple answer and most of them are wrong."
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Offline nucleus

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Re: 9V NiMH battery charging circuit
« Reply #10 on: December 17, 2009, 12:24:46 AM »
nope, 1.2V ang cell voltage ng NiMH, 6 cells in series ang 9V cell kaya 7.2V (9V sa alkaline dahil 1.5V per cell). medyo flat ang response ng NiMH, around 1.4V kapag full charge hanggang 50% to 70% used, bago bababa unti unti. tapos papatong naman ng 1.3V to 1.4V from full discharged to partial charge kaya complex ang detectors ng NiMH chargers.

tingin ko sir 8 cells yung mga nabibili na 9V NiMH nagkaroon ako nito halos 10V pag full charge :)

EDIT ulit hehehe

not so sure kung yung mga orig eh ganito din, 3 months ko lang kasi nagamit yung akin nung binuksan ko ang laman yung mga button cell na naka spot weld? ???
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Offline rdpzycho

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Re: 9V NiMH battery charging circuit
« Reply #11 on: December 17, 2009, 12:31:20 AM »
NiCd nga pala 'yung 7.2V dati. 8.4V ang NiMH, 7 cells lang. 'di pwedeng umabot ng 8 cells dahil aabot ng overvoltage sa ibang equipment. 1.4x ang sagad na voltage, pero maaga 'to lalabas. 'di pa full charge lalabas na 'yung 1.4x. fully discharged, 'yun 'yung stated nominal voltage (1.2V sa AA, discharged na talaga siya).
‎"Divide each difficulty into as many parts as is feasible and necessary to resolve it."
- Rene Descartes

"For every difficult problem there is always a simple answer and most of them are wrong."
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Offline nucleus

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Re: 9V NiMH battery charging circuit
« Reply #12 on: December 17, 2009, 12:35:29 AM »
NiCd nga pala 'yung 7.2V dati. 8.4V ang NiMH, 7 cells lang. 'di pwedeng umabot ng 8 cells dahil aabot ng overvoltage sa ibang equipment. 1.4x ang sagad na voltage, pero maaga 'to lalabas. 'di pa full charge lalabas na 'yung 1.4x. fully discharged, 'yun 'yung stated nominal voltage (1.2V sa AA, discharged na talaga siya).

ahh i see hehehehe nga pala ano kelangan pa yung current sense para maidentify kung puno na talaga ung NiMH battery
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Offline rdpzycho

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Re: 9V NiMH battery charging circuit
« Reply #13 on: December 17, 2009, 12:40:24 AM »
mas madali mag-detect sa temperature. 'di kasi sila tulad ng Lead acid na bababa ng tuluyan ang current kapag puno na, sa Nickel pwede pa ring tumuloy hanggang tuluyang mag-init 'yung battery. 'yung mga mahal na charger, temperature change, at voltage change ang basis. pwede na 'yung LM35. 'yung mga packed NiMH madalas merong thermistor sa loob.
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"For every difficult problem there is always a simple answer and most of them are wrong."
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Offline nucleus

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Re: 9V NiMH battery charging circuit
« Reply #14 on: December 17, 2009, 12:54:30 AM »
mas madali mag-detect sa temperature. 'di kasi sila tulad ng Lead acid na bababa ng tuluyan ang current kapag puno na, sa Nickel pwede pa ring tumuloy hanggang tuluyang mag-init 'yung battery. 'yung mga mahal na charger, temperature change, at voltage change ang basis. pwede na 'yung LM35. 'yung mga packed NiMH madalas merong thermistor sa loob.

BTW yung mga local na charger boltahe lang chinecheck hehehe
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Offline iking

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Re: 9V NiMH battery charging circuit
« Reply #15 on: December 17, 2009, 06:27:04 AM »
ok na po ba ung TL431 sa circuit para magtrigger ng full charge?


gawin ko rin ung may TL431..
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Offline rdpzycho

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Re: 9V NiMH battery charging circuit
« Reply #16 on: December 17, 2009, 10:47:30 AM »
BTW yung mga local na charger boltahe lang chinecheck hehehe

yup, ganun talaga. mahal kasi implement 'yung mas complex. dumadami tuloy ang myths about battery charging dahil ganyan. mali rin design nung iba na kailangan series cells ang gamit, nagre-reverse polarity kasi sa ibang situations ang NiMH.
‎"Divide each difficulty into as many parts as is feasible and necessary to resolve it."
- Rene Descartes

"For every difficult problem there is always a simple answer and most of them are wrong."
- Clayton Paul

Offline iking

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Re: 9V NiMH battery charging circuit
« Reply #17 on: December 18, 2009, 12:45:04 AM »
pano ko po gagawin ung para sa trickle charge in case maiwan ko sya na nagchacharge?
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Offline rdpzycho

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Re: 9V NiMH battery charging circuit
« Reply #18 on: December 18, 2009, 12:49:54 AM »
kapag may trickle na, kailangan meron ng current regulator. sa lead acid kasi, iwanan lang siya with regulated voltage, ok na. sa NiMH, mag-iinit siya kung 'di regulated 'yung current dahil after full charge, bumababa ang voltage.

after ma-detect na charged na siya, switch lang sa low current mode. ;)
‎"Divide each difficulty into as many parts as is feasible and necessary to resolve it."
- Rene Descartes

"For every difficult problem there is always a simple answer and most of them are wrong."
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Offline Mayor Johnaray

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Re: 9V NiMH battery charging circuit
« Reply #19 on: December 18, 2009, 03:05:21 AM »
try mo po ito:



magkakaroon ng aprox. 2.49V-2.5V sa pin1 ng TL431 kapag umabot na sa 9.2V *full charge ng 9V battery* yung boltahe sa + ng battery na magpapaon sa TL431 at magpapailaw sa FULL indicator led :D :D

;)

@ RD, ok ba itong gawa ni TOTOY Junebug? gagana kaya ito? hindi ba nito susunugin bahay namin... last time kasi nanagpayo si TOTOY June bug eh na virus laptop ko *DAMN ;D ;D ;D pero ok lang kasi Im currently enjoying UBUNTU LIVE CD ;D

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Re: 9V NiMH battery charging circuit
« Reply #19 on: December 18, 2009, 03:05:21 AM »

 

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