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Hardware
4.2.2
Power Supplies
The system default configuration is to get the 15V, 3.3V and 3.3V analog rail voltages
from the PFC stage board. However, it is also possible to use an external 24V power
supply to generate these voltages.
U19, C70, C73, C71 and C74 regulate the voltage applied to the system via J15 (28V
max). The output of the regulator is connected to the system through R109. The circuit
Note:
It is the responsibility of the user to populate these components if an
external power supply is used.
U18, C67, R110, C68, D16, D15, L3, R111, R112 and C75 regulate the 15 volts to cre-
ate a 3.3V digital rail. This auxiliary 3.3V digital rail is applied to the system through
Note:
It is the responsibility of the user to populate these components if an
external power supply is used.
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.
Note:
4.2.3
It is the responsibility of the user to populate these components if an
external power supply is used.
Power Module
The three-phase inverter is embedded in a power module (U16). This power module
contains:
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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 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 sets the threshold limit for the overcurrent circuitry. If this voltage is greater than
0.5 V (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.
? 2009 Microchip Technology Inc.
DS70605A-page 37
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