| Member Comments |
Avg rating: 84
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Abhishek_agrawal
- Battery Charger Application
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2009-03-05 |
Provide a good simulation for testing battery charging through CC and CV mode.
Can some suggested some method to test the trickle charging.
Also some one suggested how can i calculate time that battery will take to discharge.
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SThomas
- Re: Battery Charger Application
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(no rating)
2009-03-06 |
Thank you for your comment.
You can measure the charge current (including the trickle charge current) versus the battery voltage by setting the switch to position B and use the spot-testing method. Adjust the battery voltage using the potentiometer and measure the charge current using the 100mohm resistor at the BATT+ terminal.
The time to discharge a battery depends on the load conditions and the battery itself. You should be able to locate drain and power performance specifications for your particular battery on the battery datasheet and estimate the time to discharge using that information.
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Pierre
- Battery charger questions
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2009-04-20 |
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This artical was great. But i have one question. If i wanted to put multiple Li-ion cells togeather make a higher voltage what should i make the resistors be to handle this change in the simultation? I would like to have a final battery voltage fully charged to be about 12 volts. Thanks for your help.
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SThomas
- Re: Battery charger questions
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(no rating)
2009-04-21 |
Thank you for your comment.
While this circuit was not tested for BATT+ voltages greater than 4.2V, you can adjust the maximum battery voltage by changing the value of the 61.9kohm resistor connected to the FB pin of the MAX8515 (when the switch is in the A position).
Please note that the maximum supply voltage for the MAX4163 is 10V, so you will need to insert a different operational amplifier if you want a BATT+ voltage of 12V.
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Aditya
- Battery charger test ckt
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2009-05-19 |
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I used the suggested design to simulate a battery and was able to verify the functionality properly. However I was not able to simulate full charged battery condition. Is there a way I can do this. I am using MAX1758 battery charger IC having FULLCHARGE pin indication connected to a LED. Can you please suggest me how to do that?
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SThomas
- Re: Battery charger test ckt
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(no rating)
2009-05-21 |
Thank you for your comment.
To test the battery simulator at a given battery voltage, set the switch to B mode and adjust the potentiometer. For a full battery condition, adjust the potentiometer towards the high end, raising the BATT+ voltage and decreasing the charge current.
I have not tested the simulator with the MAX1758 specifically, however the /FULLCHG pin on the MAX1758 goes low only when the battery voltage is equal to the regulation voltage threshold and the charge current has not yet fallen below 330mA (typ) (see Table 1 on page 10 of the datasheet). Fine tune the potentiometer to a point at which this condition occurs and you should see /FULLCHG go low. As you continue to increase the resistance value through the potentiometer, the charge current should continue to decrease and /FULLCHG should go high again.
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Bejingaf
- Charger
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2009-10-20 |
Hello!
Is it possible to simulate also charging of multicell (3 cells )NiMh batteries?
Regards!
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SThomas
- Re: Charger
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(no rating)
2009-10-22 |
NiMh batteries have a different charge characteristic than do Li+ batteries. For more detailed information on the charge requirements for different battery types, please read, "Rechargeable Batteries: Basics, Pitfalls, and Safe Recharging Practices," (AN3501) available on the Maxim website.
This simulator was designed for a Li+ battery charge characteristic only and I would not recommend using it for a NiMh based circuit.
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Bejingaf
- Charger 1
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(no rating)
2009-10-23 |
Hello!
One more question. Is it possible to use charger also as source when fully charged, that charger and load are boath connected at same time and load is active?
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Bejingaf
- Charger 1
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(no rating)
2009-10-25 |
Hello!
What should we change to use it for NiMh simulation?
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SThomas
- Re: Charger 1
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(no rating)
2009-10-26 |
Please correct me if I have misunderstood your question, but I believe that you are asking if you can charge a battery while driving a load. The answer is yes.
Maxim has a number of battery chargers that are capable of this type of operation. Some devices that you might look into include the MAX8713 and the MAX1870A. The datasheets for both of these devices are available on the Maxim website.
Maxim also has a number of application notes that address this issue. A couple of application notes that might interest you are, "Switch-Mode Supply Charges Battery While Serving Load," (AN543) and, "Step-Up Supply Charges Battery While Serving Load," (AN924). Both of these are available on the Maxim website.
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Moe
- Re: Charger 1
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(no rating)
2009-10-26 |
To: Bejingaf
You asked: "What should we change to use it for NiMh simulation?"
The applications engineer tells me that will take a long answer and will reply to you using the technical support system. Short answer is as mentioned earlier in the comment thread:
"NiMh batteries have a different charge characteristic than do Li+ batteries. For more detailed information on the charge requirements for different battery types, please read, "Rechargeable Batteries: Basics, Pitfalls, and Safe Recharging Practices," (AN3501) available on the Maxim website.
"This simulator was designed for a Li+ battery charge characteristic only and I would not recommend using it for a NiMh based circuit."
-- Moe Rubenzahl, Maxim
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