
dsPICDEM™ MCHV-3 Development Board User’s Guide
DS50002505A-page 42
2016 Microchip Technology Inc.
3.2.5
Matrix Board
The functions of the matrix board interface are to:
• Connect the appropriate signals to the correct pins on the PIM
• Disconnect signals and provide isolation on signal paths that are not being used in
a particular hardware configuration
The matrix board header has two rows of pins. One row (Pin 1 to Pin 25) hosts signals
from different signal sources, while the other (Pin 26 to Pin 50) hosts connections to the
PIM. A block diagram describing the matrix board interface is shown in
.
FIGURE 3-1:
MATRIX BOARD BLOCK DIAGRAM
The dsPICDEM™ MCHV-3 Development Board uses discrete op amps (U13) to
amplify the shunt resistor signals. Alternatively, some of the PIC MCU or dsPIC DSC
devices include on-board op amps that can be used for this purpose. To accommodate
these two basic configurations, the dsPICDEM™ MCHV-3 Development Board comes
with two matrix boards.
The internal op amp configuration matrix board is used to configure the development
board to use op amps that are internal to the PIC MCU or dsPIC DSC devices. This
matrix board bypasses the current feedback circuitry on the Power Module Board and
directly connects the shunt resistor signals to the appropriate pins of the PIM.
The External Op Amp Configuration Matrix Board is used to configure the development
board to use the current feedback circuitry on the Power Module Board. This matrix
board disconnects the shunt resistor signals from the Plug-In Module pins and
connects the current feedback circuitry output to the appropriate Plug-In Module pins.
The PFC – External Op Amp Configuration Matrix Board is used for configuring the
development board to use the current feedback circuitry on the Power Module Board
and current/voltage feedback circuitry on the PFC board. This matrix board discon-
nects the shunt resistor signals from the Plug-In Module pins and connects the current
feedback circuitry output to the appropriate Plug-In Module pins. In addition, it also
connects the PFC input AC current and PFC input AC voltage signals.
Shunt Resistor Signals (direct)
Reconstructed Motor Neutral Voltage
Feedback Signals
(Hall sensor/phase voltage/shunt resistor)
DC Bus Voltage
Potentiometer
Matrix
Board
Plug-In Module
Note:
Unless specified in the Plug-In Module information sheet, all PIMs are
compatible only with the External Op Amp Configuration Matrix Board.
Certain PIMs are designed to work with the Internal Op Amp Configuration
Matrix Boards only. In this case, the corresponding PIM information sheet
and/or Readme file within the source code folder (available at
www.microchip.com/pims
) will explicitly state this. Using any combination
(Development Board + PIM + Matrix Board) other than that mentioned in
the Readme file placed in the source code may lead to unexpected
operation.
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