Re: KiwiAC Schematics

[Edward C. <ed...@la...>]

On 19/02/2010, at 10:52 AM, Bill Dube wrote:
> You want to have a blocking diode (reverse polarity protection) on 
> the 12 volt supply inputs. This will protect from negative-going 
> spikes and also from, you guessed it, reverse polarity connection.
Yep have now allowed for this.

> If you are feeling _very_ clever, you can configure it as a constant 
> current source by adding feedback from the ballast resistor to the 
> gate bias. A constant current pre-charge is preferable over a simple 
> resistive ballast pre-charge. You can pre-charge much more quickly 
> and you can get the bus cap voltage up to a much greater percentage 
> of the pack voltage.
> 
A constant current charge system would be preferable to the resistor approach - less peak current, shorter charge time.

I'll think about that. It won't have much bearing on the KiwiAC pcb as the signals going to the contactor box will still be the same.

Edward