RC10Kicker1Errata
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The prototype was manufactured on a barebones process so some errors have been incurred as a result.
Current Limit
The current limit measures current through the silicon not through the solenoid. When using the circuit
- The IGBT switches on
- The IGBT switches off when a programmed current limit has been reached. Thanks to the flyback diode, that current still runs in the solenoid.
- Thus, when the IGBT switches on again (nearly instantaneously) it sees the current running in the flyback/solenoid + new current. This destroys the silicon
The solution is to measure the
Barebones Layout Issues
- Traces running under isolated power supply can be shorted on mounting feet of supply
Mechanical Issues
- Solenoid connector interfere with underlying screw
- Battery connector interferes with underlying screw
Misc
- Fuses soldered into holders
Future Features
- Space to add additional IGBT with separate gate drive resistor for each output
