Inverter_Power PCB is sent to production (21-03-2024). PCB specifications:
- Base Material: FR-4
- Layers: 4
- Dimensions: 200 mm * 150 mm
- PCB Thickness: 1.6 mm
- Via Covering: Plugged
- Surface Finish: ENIG 1U"
- Outer Copper Weight: 2 oz (70um)
- Inner Copper Weight: 2 oz (70um)
- Remark: 1.10mm HOLES ARE FOR PRESS-FIT PART. USE (47.2MIL +/- 1MIL) DRILLED HOLES WITH A COPPER THICKNESS IN HOLE OF 25-50UM.
Inverter_Control PCB is sent to production (21-03-2024). PCB specifications:
- Base Material: FR-4
- Layers: 4
- Dimensions: 40 mm * 150 mm
- PCB Thickness: 1.6 mm
- Via Covering: Plugged
- Surface Finish: ENIG 1U"
- Outer Copper Weight: 1 oz (35um)
- Inner Copper Weight: 0.5 oz (17um) (does not match with project files, I know)
Changelog:
Inverter_Power
- Added 5V supply protections
- Swapped pins 4 and 5 in gate drivers' LDOs
- Swapped MP+ and MP-, and their silkscreen
- Added testpoints for current sensors' reference
- Added testpoints for VDC_sns+ and VDC_sns-
- Renamed testpoints in [3]
- Added various silkscreen texts and indications
- Added layer physical logo
Inverter_Control
- Pull-up and pull-down added for BOOT0 control
- Added I2C pull-ups
- LV+_sns deleted, VBAT connected to 3.3V
- Extras LED color and names changed
- Added layers physical logo
- Moved supply filter to +5V
- Some silkscreen
Known issues:
Inverter_Power
- D1 is not correctly rated. Replace with appropiate PMOS or beefier Schottky (beware the voltage drop)
- Rdis does practically nothing compared to R504 .. R510 and could be eliminated.
- Missing decoupling capacitors near semiconductor DC+ and DC- terminals. Proposed reference is 2220Y1K00104KZT, 2 for each module.
- R301 can be of lower value.
- Most DNP caps are actually needed.
- D501 failed once, but cause remains unknown.
- R501 should have a bigger value.
- R511 and R512 should have a small tolerance, and it should be specified in the schematic.
- 10uF 50V 0805 caps are expensive and should be replaced with 10uF 50V 1206 or 10uF 50V 1210.
- Managed to somehow displace a press-fit RedCube terminal, so copper thickness in via and/or surface finish is probably not good. Check with manufacturer, and try to match Wurth Elektronik's and Wolfspeed's specifications.
Inverter_Control
- DCDC101 not tested yet.
- L101 has a very low current rating. Choose new part with a rating of at least 3A.
- Q101 and USB in general not tested yet.
- U501 not working as expected.
- MCU dot in silkscreen might be misleading. Check the orientation very carefully.
- 3.3V OVP should be added to all non-5V-tolerant MCU pins.
- Most if not all 15R resistors could very well be 0R or solder bridges.
- 10uF 50V 0805 caps are expensive and should be replaced with 10uF 50V 1206 or 10uF 50V 1210.