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Sully
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Join Date: May 2008
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Battery Charger Theory

05/22/2008 3:48 PM

I am interested in learning the theory of battery chargers. What resources, materials, books or other media would you recommend to start the basic theory?

Thanks,

Sully
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user-deleted-1105
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#1

Re: Battery Charger Theory

05/22/2008 5:04 PM

Google battery chargers and battery charger ICs.

Google the specific battery type your are interested in....
Go to battery manufacturers websites...they will give plenty of info an charging their batteries.

Del

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Sully
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#2
In reply to #1

Re: Battery Charger Theory

05/28/2008 11:23 PM

Thank you for the response. I'm actually looking for theory on the charger itself. For example, what is the mathematical relationship between the maximum power output to the required power input? Is the relationship the same throughout the "bulk" charging state? Does the relationship remain the same during trickle charge?

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Sully
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PWSlack
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#3
In reply to #2

Re: Battery Charger Theory

05/29/2008 8:58 AM

Q1: what is the mathematical relationship between the maximum power output to the required power input?

A1: The required power input = the maximum power output - the power losses inside the equipment.

Q2: Is the relationship the same throughout the "bulk" charging state?

A2: As the battery voltage comes up, the charging current drops, so the unit is no longer operating at maximum output power.

Q3: Does the relationship remain the same during trickle charge?

A3: Same as A2.

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Sully
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#4
In reply to #3

Re: Battery Charger Theory

05/29/2008 8:32 PM

Thank you for the clarification.

One further question. I inquired of MinnKota on their MK440 four bank 12V charger and the response was that 6.4 A @ 120V AC (768W) would produce 10A per bank @ 12V (480W). Is 288W loss accurate? (It seems high.)

Sully
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