TIDUEY6 April 2021
Analog back end module acts as a back end analog reconstruction module for the differential feedback signals received from the traction inverter module and DC-DC converter module. It is designed using TLV6001 and OPA2350 and other standard linear parts. The module is shown in Figure 3-17.
It is mounted on control mother board headers J16 and J27. Basically this module reconstructs the phase current and DC bus voltage signals of the traction inverter and DC-DC converter into low voltage analog signals. These are fed as ADC inputs for control and safety MCUs in the mother board. Besides, the module also provides a digital status feedback for absolute over current, where the limit can be set by resistors R19, R20, R21 and R22 in this module. A digital status feedback for over voltage is also provided, where the limit is set by resistors R14 and R17. There is also over temperature sensing circuit but is re-purposed to measure the DC-DC converter voltage, and its limit protection is ignored. The limit crossing status are latched and is left for the MCUs to clear them per user choice.