12v supply

[hall99m]

I am using a controller for my windmill which requires a 12v dc supply.  

Currently I have been using a mains powered 12v supply with a 12v battery as a backup to run the controller.  

I was wondering if there was a way to supply the controller from the windmill?

Hall99m.

[asheets]

I don't know much of anything, but being corrected by experts is a good way to learn stuff...

How about a 12 V battery and one of those Harbor Freight solar "battery chargers"?

The only other idea I have is to borrow a few windings from the mill, charging a 12V battery, and running the controller that way.  But the problem with my ideas is that they both need a charge controller of some sort to keep the batteries from dying -- which is a catch-22...

[Nando]

yes,you can, please detail your wind mill, including output voltage when un-loaded and at maximum RPM.

Describe your controller and specifications with required voltage and current.

Nando

[hall99m]

My windmill gererates a 3 phase AC voltage of between 100-200V, max 5A.  My controller needs 12V, 0.5A.

Hall99m.

[Nando]

You have not said if the connection is STAR or DELTA.

You need to rectify the 3 phases, also you need to tell me if you are charging a battery and at what point (voltage generated) you are loading the generator.

There are many small PWM controllers good for 115 volts AC that have an Isolated 12 volts output with amperages like 0.5 to 1.5 amps.

Some are good for 115 others are wide universal range ( 85 to 265 volts AC ) OF COURSE YOU LOOK ONE FOR "UNIVERSAL VOLTAGE RANGE"

CUT THE POWER CORD next to the plug, find the white and black wires, connect the BLACK WIRE to the POSITIVE coming from the wind mill, the WHITE WIRE to the NEGATIVE wind mill.

You have attained a power source for your controller that may start to operate around 60 Volts AC, you may add a LED to know that the power is ON, I use a LED plus a Zener and a resistor

For 12 Volts, I use a 6.8 Volts zener, a Green diode and ( 6.8 + 2 = 8.8 volts) with 20 milliamps current so the resistor is 12 - 8.8 = 3.2 volts/20*10^3 = 160 ohms - USE 150 OHMS -- 1/4 WATT OK.

Use a Zener to insure that the supply is above 9 volts up.

There you have a good supply feeding your controller -- surplus around 8 to 10 dollars, I think

let me know how it worked for you, my address in in the message heading

Regards

Nando

[Nando]

To clarify further.

This way, the wind mill will not be loaded until the generated voltage is around 60 AC -- point where the PWM supply starts to work feeding the controller.

Why do you need 0.5 amps ?. Please describe your controller in detail, specially with the current usage.

If you want to charge the battery, then is necessary to get a PWM supply with 13.8 volts or to internally change the feedback setting output voltage resistor(s).

INFORM for further adjustments in the data offered .

SPECIALLY IF THE INPUT OPERATING VOLTAGE needs to be lower --

Nando

[hall99m]

My generator is wired in star.

My controller draws around 0.5A, I will try to send you a wiring diagram.

I am looking to build a circuit that will power my controller from the windmill so I will not need a mains supply and a battery.

I start to load the windmill at around 100v.

Hall99m.