Hello all,

I need to run a 12V/0.6A dc fan to cool the MOSFETs of an inverter with 1kV input. it would be overkill to use some power supply to step down the 1kV to 12V or any DCtoDC converter!..
I thought of using just a resistor divider to step down the voltage to an acceptable range to use a voltage regulator but I am not sure about the idea! is it feasible?

is there any better solution?

Regards,

 

Using a resistance, or any linear voltage reduction method from 1KV to 12V 600 mA would need to dissipate nearly 600W as heat. This is a ridiculous thing to do. And a DC to DC converter with 1KV inout would not be easy to do.

There s no practical way to do this.

Is there no other power available? If not, the only reasonable solution is a battery.

 

Using a resistance, or any linear voltage reduction method from 1KV to 12V 600 mA would need to dissipate nearly 600W as heat. This is a ridiculous thing to do. And a DC to DC converter with 1KV inout would not be easy to do.

There s no practical way to do this.

Is there no other power available? If not, the only reasonable solution is a battery.

Thank you Bob for the guidance,
In that case, I will just use an external power supply.

 

Hello all,

I need to run a 12V/0.6A dc fan to cool the MOSFETs of an inverter with 1kV input. it would be overkill to use some power supply to step down the 1kV to 12V or any DCtoDC converter!..
I thought of using just a resistor divider to step down the voltage to an acceptable range to use a voltage regulator but I am not sure about the idea! is it feasible?

is there any better solution?

Regards,

What is the inverter output voltage? If that were 12 volts the solution would be simple. If it is 120 volts or 240 volts, fans running on those voltages are available. A resistor to drop the voltage is the worst possible method. An added 12 volt winding on the inverter transformer will be the very best option. It should not take very many turns of quite thin wire, and then just a diode bridge.

 

There are DC-DC converters available off the shelf, like this one:
https://www.digikey.com/en/products/detail/mornsun-america-llc/PV15-29B12R3/17883299
Full search here:
https://www.digikey.com/en/products...NVATCMQJzcAsnIAXWIAHAC5QQAZVEAnAJYA7AOYgAvuqA