Part Number: AMC1311
Tool/software:
Hi BU,
Good day!
My customer is using the AMC1311 to sense the PFC DC bus voltage. After the AMC1311, the signal is fed into a differential op-amp before going into the DSP for measurement.
His charger configuration is a two-stage design:
- TPU: includes the PFC stage and the wireless inverter stage.
- RPU: includes the wireless rectifier stage.
- The two units are connected wirelessly, with Bluetooth communication between them.
When testing only with the PFC stage, the DSP reads the voltage correctly and regulates it to track the reference. However, once he turns on the inverter side, the DSP-measured PFC voltage shifts significantly — at higher power, the offset becomes larger.
For example:
- Standby setting: DSP measured = 420 V, VOM = 420 V
- Light load setting: DSP measured = 400 V, VOM = 404 V
- Full load setting: DSP measured = 400 V, VOM = 410 V
His questions are:
- Could RF interference be causing this issue?
- How can he mitigate or solve this problem?
Thank you!
Regards,
John
