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#16
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Re: Backup onboard charger not correct
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Last edited by Dad1279 : 23-01-2007 at 08:57. |
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#17
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Re: Backup onboard charger not correct
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thanks! |
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#18
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Re: Backup onboard charger not correct
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#19
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Re: Backup onboard charger not correct
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#20
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Re: Backup onboard charger not correct
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. I have 2 things that I'm not sure about, this, and the radio problem. |
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#21
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Re: Backup onboard charger not correct
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I could see how it might be interpreted that way but the rules simply state the IFI suppied circuit design must be used. I read that (and the inspectors last year were interpreting it) that it is and must remain unmodified. |
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#22
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Re: Backup onboard charger not correct
The rules say:
<R56> The 7.2v backup battery may be charged on or off the ROBOT. When off the ROBOT, the battery is to be charged with the provided 7.2V backup battery charger. When mounted on the ROBOT, the backup battery may be charged from the 12VDC primary battery by using the custom charging circuit available from Innovation First Inc. (note: IFI will provide the design for this circuit on the IFI website, however teams must obtain the parts for this circuit and assemble it themselves). The use of this circuit is strongly encouraged. This rule does not say that it MUST be charged with the IFI circuit. This wording appears to allow an alternate, on-robot charger. We should get an official ruling from USFIRST on this. |
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#23
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Re: Backup onboard charger not correct
I have already submitted a Q&A to the official FIRST forums. We should have our answer in a few days.
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#24
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Re: Backup onboard charger not correct
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Jerry, Read that rule as "if you charge it on the robot it must use the IFI charger. If you charge it off the robot then you must use the supplied charger". There is no other alternative. |
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#25
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Re: Backup onboard charger not correct
Certainly that is the safest way to read the rule, but USFIRST has in the past been very specific in their choice between the words "may" and "must". If this rule specifically, definitively, was intended to disallow an alternate on-robot charger, is should use the word "must".
A poorly designed charger could lead to overheating of the batteries, so a specific charger design should be used here. I'll be interested in their comments on this. |
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#26
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Re: Backup onboard charger not correct
I might be wrong...
I am assuming they are enforcing the use of the IFI circuit for safety reasons, but if they truely want to be safe, they should include something prebuilt in the kit because there is no guarantee that whoever builds the circuit will build it correctly. |
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#27
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Re: Backup onboard charger not correct
We have just built one, and will post some voltage and current measurements in the next few days.
I would not be concerned about overcharging, the current is limited by the resistors, it is only on for a few minutes at a time, and you should only be using this circuit if you have servos & cameras drawing power. |
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#28
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Re: Backup onboard charger not correct
We might be getting a new schematic... I can't find it on the IFI web site.
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#29
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Re: Backup onboard charger not correct
Second that. The links in this thread are 404ing.
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#30
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Re: Backup onboard charger not correct
Oh geez... right after I built the old defective one
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