Chevy Sparks contain a modified (half unpopulated) inverter from the Chevy Volt. The High Voltage control board sits underneath the main logic board.
Per reverse engineering done by TomDB on the DIY Electric Car forums, the High Voltage control board accepts logic level low commands to turn on the IGBT. Per his note, the Optocoupler inputs are high when not active. Also, per the PDF in post 16, the logic level is active LOW, so this must be accounted for in the PWM driver circuit.
https://www.diyelectriccar.com/forums/showpost.php?p=926842&postcount=16
pin color function of the High Voltage control board connector.
1 green Temp B
2 black ground
3 -
4 white
5 -
6 red power +5V
7 yellow Top gate A
8 green Top gate B
9 blue Top gate C
10 yellow Temp A
11 blue Temp C
12 -
13 -
14 -
15 -
16 yellow bottom gate A
17 green bottom gate B
18 blue bottom gate C
My intent is to use the very basic Damien McGuire 8kHz PWM generator to power this High Voltage board. Bare boards can be purchased here:
http://evbmw.com/index.php/evbmw-webshop/miscellaneous-bare-pcbs/dc-log-v1
And the source files can be located here:
https://github.com/damienmaguire/DC-Motor-Controller
