Comments
Switch all ultrafit connectors to microfit.
Could you recheck the resistor values for a 95% precharge - or was that not the number we are going for?
Check precharge resistors for a fast precharge time.
The precharge is controlled through the precharge_sw load switch, from the PA9_Precharge_EN pin on the controller board as well.
Why hold Reset of the SR Latch LOW for 8.4ms?
Why is R50 1/4W?
Why 2.2uF 100V capacitors?
The paralleled precharge FETs should have resistors on their gates individually, not paralleled. This can cause oscillations, but is usually not an issue unless switching them on/off rapidly in a motor controller of similar.
Why is R17 a 1% resistor when the others in those voltage dividers are 0.1%?
I believe our DC-DC converter is set to 13.5V. Is there another isolated DC-DC converter that has a higher voltage rating? The XPPower one says 13.2V max. This is probably not a huge issue though.Currently, any thermistor overtemp will turn off the precharge and notify the controller board (but will not activate the discharge) This can be left up to firmware. We need to decide what to do if the discharge is overheating - ideas? Do we leave the high voltage on the motor controller, or do we keep discharge active and hope it does not burn?
Added:
4 connectors for thermistors to FET gates for precharge and discharge, and power resistors
Comparators, and an optoisolator for thermistor circuit
2 FETs on the isolating DC-DC to turn off the isolated side through firmware (normally on/closed)
2 connectors and circuitry for fans to cool motor controllers
LED on discharge circuit
Additional inputs to MCU for data logging
Changed:
Power resistor values
Additional thermistor output to shut off precharge (aside from precharge complete)
Components added to library:
RES 1K OHM 15W 1% TO126
RES 5K OHM 25W 1% TO220
IC MUX 1 Circuit IC Switch 2:1 3Ohm SC-70-6 (not used)
Footprints added to library:
RES TO-126-2
RES TO-220-2
IC MUX 1 Circuit IC Switch 2:1 3Ohm SC-70-6