DM330023-2 Microchip Technology, DM330023-2 Datasheet - Page 43

• 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

 2012 Microchip Technology Inc.
R114, R107, C69, and C72 form a decoupling circuit for generating a 3.3V rail for the
analog circuitry such as the ADC reference and the current feedback reference. This
auxiliary 3.3V analog rail is applied to the system through R108.
4.2.3
The three-phase inverter is embedded in a power module (U16). This power module
contains:
• 600V/30A 3-phase IGBT Inverter Bridge
• Gate driver circuitry for each IGBT
• Three Independent connections to the negative DC bus for current sensing
• Short-circuit protection circuitry
• Thermal Shutdown
• Gate Driver Power Supply Undervoltage protection
• Gate Driver Power Supply Overvoltage protection
• Single-grounded power supply
• Isolation of 2.5 kV per minute
• Maximum switching frequency: 20 kHz
The PIC24 MCU or dsPIC DSC provides the PWM signals to this power module in
order to turn on/off the IGBT, and therefore apply power to the motor phases.
R95 and R124 set the threshold limit for the overcurrent circuitry. If this voltage is
greater than 0.5V (typical), a fault signal is asserted and the low-side IGTBs are turned
off. R94 and C53 form a low-pass RC filter that filters out the frequencies above
88.4 kHz.
C56 sets the fault pulse duration, the value of C56 is given by the following equation:
C56 = 18.3E-6 x 1.8E-3 seconds. Therefore, the fault pulse duration is 54 µs.
The power module fault output pin (VFO) is open-collector configured. R50 pulls up the
fault output to the analog 3.3V rail. R53 and C40 form a low-pass RC filter that filters
out the frequencies above 53 kHz.
For more information about this power module please refer to the manufacturer’s data
sheet.
4.2.4
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 PIC24 MCU or 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 PIC24 MCU or 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.
Note:
Power Module
Feedback Circuitry
It is the responsibility of the user to populate these components if an
external power supply is used.
DS52074A-page 43