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dsPICDEM? MC1H 3-Phase High Voltage Power Module
? If the user has bypassed the PFC diode or even the entire PFC section (see
Section 1.5.3.3 “Bypassing The PFC” ) then LK1 for U2 may be used to allow
higher peak input currents while still ensuring ground FAULT protection is active.
Alternatively if the user wishes to develop a low power PFC application, then LK3
may be used for improved feedback sensitivity.
? The scaling of U3 and 4 is different from that shown above. This is because the
output leads are also passed through the transducers thereby giving an additional
turn for increased sensitivity. The scaling and trip levels for U3 and U4 are shown
in Table 1-10.
TABLE 1-10:
INVERTER LEG CURRENT TRANSDUCER SCALING SELECTION
LK 15/18 Closed
LK14/17 Closed
LK13/16 Closed
Scaling (A / V)
Trip Level (A)
2.4
± 4.4
3.2
± 5.9
4.8
± 8.9
Caution:
Owing to thermal limitations of the inverter power devices, the user
should be very careful about changing the scaling of U3 and 4. If the
user has robust current regulation and stall detection software then
LK14 and LK17 may be used to allow higher output currents. However
the power devices will only be sufficiently cooled if PWM duty cycles do
not exceed 75% below 10 Hz fundamental output frequency. Under no
circumstances should LK13 and LK16 be used, as adequate thermal
protection of the power devices is not provided.
? Once the modification is complete, install the lid ensuring all the screws are
replaced.
1.5.3.1
CHANGING VOLTAGE FEEDBACK AND TRIP SCALING
The voltage feedback scaling is configured for the maximum range of input voltages. If
the user requires full ADC resolution at lower voltages, then this can easily be
accomplished by changing the high voltage resistors mounted on the top of the PCB.
? Follow the procedure given in Section 1.5.2 “Accessing The System” for
accessing the unit.
? To change DC bus voltage scaling, modify R10, R13, R14. Note, if using the back
EMF crossing detection circuitry (see Section 1.4.7.3 “Inverter Output Voltage
Feedback and Sensorless Detection” ), the user should also change the phase
voltage feedback resistors to ensure consistent scaling.
? To change |VAC| voltage scaling modify R12 and R15.
? To change phase voltage scaling modify R16-R20.
? In all cases, it is suggested that the changes be made from the top of the board. If
new component legs are inserted, these should be cropped to ensure that the
maximum length of lead protruding below the PCB is 4 mm.
? Once the modification is complete, install the lid ensuring all the screws are
replaced.
DS70096A-page 32
? 2003 Microchip Technology Inc.
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