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dsPICDEM? MCHV Development System User’s Guide
4.2.4
Feedback Circuitry
The Power Module Stage provides three different methods to sense the motor position.
These signals are also useful to determine the speed, the torque, current consumption
and the applied voltage.
Hall Sensors, the hall sensors circuitry is designed to attach open-collector configured
sensors. It has a pull-up resistor at the hall sensor inputs (R23, R24, and R25) and a
voltage divider (R26-R29, R27-R30, R28-R31) in order to scale the input waveforms to
the dsPIC DSC logic levels. C25-C27 and R26-R28 form a low-pass RC filter for each
hall sensor signal.
Phase Voltage Feedback circuitry for each phase is compounded by a voltage divider,
a current limiter and a low-pass RC filter. R79, R84 and R92 scale the phase M1 volt-
age in order to match the dsPIC DSC logic levels. R85 limits the current going to the
ADC pin (< 6mA). C51, R79 and R84 form the low-pass filter. The phase M2 and M3
has the exact same circuitry as shown in the schematic.
DC Bus Voltage Feedback is compounded by a voltage divider and a low-pass RC
filter. R75, R76 and R81 scale the DC bus voltage in order to match the dsPIC DSC
logic levels. C47, R75 and R76 form the low-pass filter.
Inverter Leg Shunt Resistor Feedback, a shunt resistor is located between the emit-
ter of the low side switches M1 and M2 and the “-DC bus”. A simple differential amplifier
circuit is used as shown in Appendix A. The operation of the circuit used for the M1
phase leg is described below:
The current is measured using the shunt resistor R86 and the operational amplifier
MCP6024 (U13A); R32, R33, R34, R36, R37 and R38 set the gain. R38 shifts the volt-
age present at the shunt resistor to a 1.65V DC level. Hence the voltage applied to the
dsPIC DSC ADC channel varies within 0-3.3V. The offset is controlled by R59, R60,
R38 and U13D. R35 and C34 filter out the high-frequency noise.
The same topology is used for the phase M2.
DC Bus Current Feedback, a shunt resistor is located between the shunt resistors of
side switches M1 and M2 and the “-DC bus”. A simple differential amplifier circuit is
used as shown in the schematic. The operation of the circuit used for sensing the DC
bus current is described as follows:
The current is sensed using the shunt resistor R95 and the operational amplifier
MCP6024 (U13C); R51, R52 and R49 set the gain. R58 shifts the voltage present
at the shunt resistor to a 1.65V DC level. Hence the voltage applied to the dsPIC
DSC ADC channel varies within 0-3.3V. The offset is controlled by R59, R60, R58
and U13D. R54 and C42 filter out the high-frequency noise.
DS70605A-page 38
Note:
It is possible to select any of these feedback signals using jumpers J12, J13
and J14, please refer to Section 4.2.8 “User Interfaces” for more
information.
? 2009 Microchip Technology Inc.
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