2.2.2.2 Analog Front End

The field-oriented control requires multiple analog signals, each requiring analog processing before the MCU can take it. Some of these parameters affect the firmware parameters. The Analog Front End GUI allows users to configure these analog processing circuits so that the parameters are automatically taken by the firmware during generation.

Currently, QSpin only supports on-leg dual shunt-based current sensing. Refer to current measurement techniques to learn about different types of current sensing techniques.

Graphical User Interface

Configure Phase A Current Sensing Analog Circuit

Analog Front End

In Harmony QSpin, the voltage source can be set in the following steps:

  1. Set the following fields:
    FieldsDescription
    Op-ampExternal Opamp or Internal opamp
    GainOpamp gain
    OffsetOpamp offset or Bias. This is usually half of ADC reference voltage.
    Shunt resistanceShunt resistance value in ohms

Configure Phase B Current Sensing Analog Circuit

Ib

In Harmony QSpin, the voltage source can be set in the following steps:

  1. Set the following fields:
    FieldsDescription
    Op-ampExternal Opamp or Internal opamp
    GainOpamp gain
    OffsetOpamp offset or Bias. This is usually half of ADC reference voltage.
    Shunt resistanceShunt resistance value in ohms

Configure DC Bus Voltage Sensing Analog Circuit

Vdc

In Harmony QSpin, the voltage source can be set in the following steps:

  1. Set the following fields:
    FieldsDescription
    Top resistanceResistance of top resistor of the voltage divider circuit in ohms
    Bottom resistanceResistance of bottom resistor of the voltage divider circuit in ohms