On Sat, 21 Apr 2007 21:49:14 +1000, "marcus" wrote:

Has anyone come across a circuit for a manually-adjustable, or even
automatic regulator circuit
to control a 24V car alternator?
Application is deep-cycle solar battery charging using 3-5HP small petrol
motor coupled to 24V alternator.
Need to tweak the voltage up to about 29-30V to equalise the batteries.
Solar batteries like a 3-stage charging regime - boost, bulk & float. These
voltages are all diff. and also depend on battery type (chemistry), so the
field needs to have these adjustable set-points.
Would be nice to be able to sense battery voltage and feedback into
alternator field voltage, to make a set-and-forget circuit.

Here's some background (12V, and no feedback) :
http://www.homepower.com/files/mark8.pdf

Thanks to everyone in aus.electronics who had a look at this.

Jim Thompson : I notice from your web pages that you have designed some car
alternator regulation projects - wondering if you have any thoughts?

Thanks all

Marcus in outback Oz


Of course. (Most of my early patents were automotive products.)

Early next week... I'm buried with work this weekend.

Flat voltage or do you need temperature compensation?

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

America: Land of the Free, Because of the Brave

On Sat, 21 Apr 2007 07:22:35 -0700, Jim Thompson
wrote:

On Sat, 21 Apr 2007 21:49:14 +1000, "marcus" wrote:

Has anyone come across a circuit for a manually-adjustable, or even
automatic regulator circuit
to control a 24V car alternator?
Application is deep-cycle solar battery charging using 3-5HP small petrol
motor coupled to 24V alternator.
Need to tweak the voltage up to about 29-30V to equalise the batteries.
Solar batteries like a 3-stage charging regime - boost, bulk & float. These
voltages are all diff. and also depend on battery type (chemistry), so the
field needs to have these adjustable set-points.
Would be nice to be able to sense battery voltage and feedback into
alternator field voltage, to make a set-and-forget circuit.

Here's some background (12V, and no feedback) :
http://www.homepower.com/files/mark8.pdf

Thanks to everyone in aus.electronics who had a look at this.

Jim Thompson : I notice from your web pages that you have designed some car
alternator regulation projects - wondering if you have any thoughts?

Thanks all

Marcus in outback Oz


Of course. (Most of my early patents were automotive products.)

Early next week... I'm buried with work this weekend.

Flat voltage or do you need temperature compensation?

...Jim Thompson

Also, Is field tied to A+ end or ground end of alternator?

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

America: Land of the Free, Because of the Brave