DM330023-2 Microchip Technology, DM330023-2 Datasheet - Page 44

• Manufacturer Part Number: DM330023-2
• Description: Power Management IC Development Tools dsPICDE MCHV-2
• Manufacturer: Microchip Technology
• Type: Motor / Motion Controllers & Driversr

Specifications of DM330023-2

• Rohs: yes
• Product: Development Boards
• Tool Is For Evaluation Of: PIC24F, PIC24E, dsPIC33F, dsPIC33E
• Input Voltage: 90 V to 265 V
• Output Voltage: 15 V
• Interface Type: UART
• Output Current: 0.75 A
• For Use With: PIC24F, PIC24E, dsPIC33F, dsPIC33E

DS52074A-page 44
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 PIC24 MCU or
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
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, and R37 set the gain. R38 shifts the voltage
present at the shunt resistor to a 1.65V DC level. Hence the voltage applied to the
PIC24 MCU or 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:
4.2.5
The functions of matrix board interface are to:
• Connect the appropriate signals to the correct pins on the Plug-In Module
• Disconnect signals and provide isolation on signal paths that are not being used in
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
Plug-In Module. A block diagram describing the matrix board interface is shown in
Figure
FIGURE 4-1:
(Hall sensor/Phase voltage/Shunt resistor)
a particular hardware configuration
Note:
The current is sensed using the shunt resistor R95 and the operational amplifier
MCP6024 (U13C); R49, R51, R52, R56, and R57 set the gain. R58 shifts the
voltage present at the shunt resistor to a 1.65V DC level. Hence the voltage
applied to the PIC24 MCU or 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.
Reconstructed motor neutral voltage
4-1.
Matrix Board
It is possible to select any of these feedback signals using jumpers J12, J13
and J14, please refer to
information.
Shunt resistor signals (Direct)
MATRIX BOARD BLOCK DIAGRAM
Feedback signals
DC bus voltage
Potentiometer
Appendix A. “Board Layout and
Section 4.2.9 “User Interfaces”
Matrix
Board
 2012 Microchip Technology Inc.
Schematics”. The
Plug-In Module
for more