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Oliver Betz
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 Posted: Mon Nov 17, 2008 9:06 am Post subject: Re: Did Intel screw up big time by selling its embedded proc |
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Joerg wrote:
[..."never understand"...]
| Quote: | How do you charge NiMH packs as fast as possible from any (maybe
unknown) state, with different amounts of available power (USB port or
charger), at any temperature?
Cheaper chargers require 2h or more. However, at church we use a more
elaborate charge station from Ansmann in Germany. It is uC controlled
and can take batteries at any stage,
Insert a fully charged NiMH battery and it will be damaged.
That happens at church all the time. Someone wants to insert a freshly
The "full" detection doesn't work with dU/dt detection, so I wonder
which charger you use. The Ansmann chargers _I_ know can't handle full
batteries reliably.
I'd have to dig that out but AFAIR it is the "Energy 16" model. We have
two of those in use.
likely it measures impedance to guess the charge status. Hard to do
with limited power.
Unless you pulse-load to measure 
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you don't want to spend the energy necessary to get a reliable result.
Oliver
--
Oliver Betz, Munich
despammed.com might be broken, use Reply-To: |
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Joerg
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| Posted: Mon Nov 17, 2008 11:39 pm Post subject: Re: Did Intel screw up big time by selling its embedded proc |
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Oliver Betz wrote:
| Quote: | Joerg wrote:
[..."never understand"...]
How do you charge NiMH packs as fast as possible from any (maybe
unknown) state, with different amounts of available power (USB port or
charger), at any temperature?
Cheaper chargers require 2h or more. However, at church we use a more
elaborate charge station from Ansmann in Germany. It is uC controlled
and can take batteries at any stage,
Insert a fully charged NiMH battery and it will be damaged.
That happens at church all the time. Someone wants to insert a freshly
The "full" detection doesn't work with dU/dt detection, so I wonder
which charger you use. The Ansmann chargers _I_ know can't handle full
batteries reliably.
I'd have to dig that out but AFAIR it is the "Energy 16" model. We have
two of those in use.
likely it measures impedance to guess the charge status. Hard to do
with limited power.
Unless you pulse-load to measure :-)
you don't want to spend the energy necessary to get a reliable result.
|
In medical electronics or other safety-critical applications we usually
have to adhere to what the manufacturers recommend. For example, the
other topic (pulse charge) was explained here but currently this link
doesn't work:
http://www.panasonic.com/industrial/battery/oem/images/pdf/panasonic_nimh_chargemethods.pdf
Only a brief outline but at least this link works, page 18:
http://products.panasonic-industrial.com/datasheets/en/Panasonic_Ni-MH_Handbook.pdf
--
Regards, Joerg
http://www.analogconsultants.com/
"gmail" domain blocked because of excessive spam.
Use another domain or send PM. |
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Oliver Betz
Guest
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| Posted: Tue Nov 18, 2008 9:01 am Post subject: Re: Did Intel screw up big time by selling its embedded proc |
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|
Joerg wrote:
[..."never understand"...]
| Quote: | How do you charge NiMH packs as fast as possible from any (maybe
unknown) state, with different amounts of available power (USB port or
charger), at any temperature?
Cheaper chargers require 2h or more. However, at church we use a more
elaborate charge station from Ansmann in Germany. It is uC controlled
and can take batteries at any stage,
Insert a fully charged NiMH battery and it will be damaged.
That happens at church all the time. Someone wants to insert a freshly
The "full" detection doesn't work with dU/dt detection, so I wonder
which charger you use. The Ansmann chargers _I_ know can't handle full
batteries reliably.
I'd have to dig that out but AFAIR it is the "Energy 16" model. We have
two of those in use.
likely it measures impedance to guess the charge status. Hard to do
with limited power.
Unless you pulse-load to measure :-)
you don't want to spend the energy necessary to get a reliable result.
In medical electronics or other safety-critical applications we usually
have to adhere to what the manufacturers recommend. For example, the
other topic (pulse charge) was explained here but currently this link
doesn't work:
http://www.panasonic.com/industrial/battery/oem/images/pdf/panasonic_nimh_chargemethods.pdf
Only a brief outline but at least this link works, page 18:
http://products.panasonic-industrial.com/datasheets/en/Panasonic_Ni-MH_Handbook.pdf
|
I'm afraid that you didn't even understand this document correctly.
Oliver
--
Oliver Betz, Munich
despammed.com might be broken, use Reply-To: |
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Joerg
Guest
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| Posted: Tue Nov 18, 2008 11:43 pm Post subject: Re: Did Intel screw up big time by selling its embedded proc |
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Oliver Betz wrote:
| Quote: | Joerg wrote:
[..."never understand"...]
How do you charge NiMH packs as fast as possible from any (maybe
unknown) state, with different amounts of available power (USB port or
charger), at any temperature?
Cheaper chargers require 2h or more. However, at church we use a more
elaborate charge station from Ansmann in Germany. It is uC controlled
and can take batteries at any stage,
Insert a fully charged NiMH battery and it will be damaged.
That happens at church all the time. Someone wants to insert a freshly
The "full" detection doesn't work with dU/dt detection, so I wonder
which charger you use. The Ansmann chargers _I_ know can't handle full
batteries reliably.
I'd have to dig that out but AFAIR it is the "Energy 16" model. We have
two of those in use.
likely it measures impedance to guess the charge status. Hard to do
with limited power.
Unless you pulse-load to measure
you don't want to spend the energy necessary to get a reliable result.
In medical electronics or other safety-critical applications we usually
have to adhere to what the manufacturers recommend. For example, the
other topic (pulse charge) was explained here but currently this link
doesn't work:
http://www.panasonic.com/industrial/battery/oem/images/pdf/panasonic_nimh_chargemethods.pdf
Only a brief outline but at least this link works, page 18:
http://products.panasonic-industrial.com/datasheets/en/Panasonic_Ni-MH_Handbook.pdf
I'm afraid that you didn't even understand this document correctly.
|
Like what in there? All I can say is that the battery apps I was
involved in afford their users a healthy and long battery pack lifetime.
Here is a brief outline of the other side, impedance testing:
http://www.buchmann.ca/Chap9-page2.asp
--
Regards, Joerg
http://www.analogconsultants.com/
"gmail" domain blocked because of excessive spam.
Use another domain or send PM. |
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