Possible overheating problem of excitation amplifier
Posted: Tue Jun 04, 2019 2:27 pm
During testing today I suddenly lost feedback from the resolver and am getting the LORESAMP message. I'm assuming because the car is parked in the sun and it's 32°C in the shade, that the analog excitation amplifier (IC2) has overheated and failed.
There are two possible measures:
- Glue a small heatsink on top of it
- Make sure the output is almost rail-to-rail (9V) which increases efficiency
The latter means checking the resistor value of R40 and R41. They should both be 3k3 for 18kHz PWM frequency (standard in Leaf inverter).
I will investigate this further when I come back from holiday.
There are two possible measures:
- Glue a small heatsink on top of it
- Make sure the output is almost rail-to-rail (9V) which increases efficiency
The latter means checking the resistor value of R40 and R41. They should both be 3k3 for 18kHz PWM frequency (standard in Leaf inverter).
I will investigate this further when I come back from holiday.
