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dsPICDEM? MC1H 3-Phase High Voltage Power Module
TABLE 1-5:
DC BUS SHUNT RESISTOR FEEDBACK
Fire R Top
0
0
0
0
1
1
1
1
Phase Y Top
0
0
1
1
0
0
1
1
Phase B Top
0
1
0
1
0
1
0
1
DC Bus Shunt
0
+IB
+IY
-IR
+IR
-IY
-IB
0
From this table it is clear that bipolar sensing requires with the same scaling as that
used for the inverter leg shunts. It can be seen that for the 000 and 111 conditions
(which corresponds to zero output phase voltage), no information is available. This
can cause considerable problems if operation at low output voltages is required when
using sinusoidal modulation.
Instead of actually physically implementing the bus shunt, in this design, the signal
has been derived as the sum of the three inverter leg shunts. In this way, power circuit
layout was not compromised. In a commercial application, it is normal to implement all
three leg shunts or the bus shunt, but not both schemes. The summing amplifier
circuit used can be seen on Appendix A, Sheet 3.
1.4.6.4
BRAKE SHUNT RESISTOR FEEDBACK
Knowledge of the brake resistor current magnitude is not required for control of the
DC bus voltage with a brake chopper. Only feedback of the DC bus magnitude is
required. Knowledge of the brake resistor value and the applied PWM can be used to
determine peak and average current flowing for thermal protection of both the resistor
and the power devices. However, knowledge of the brake chopper current is useful for
protection of the switch should a wiring fault occur or the resistor fail. Although a fuse
could be used it is often difficult to design and expensive requiring very fast acting
types. In this instance instead of a fuse, the switch current is monitored by a shunt
between the emitter and the -DC bus in exactly the same way as used for the inverter.
This is used for an over-current trip and is also made available as an optional
feedback signal. Thus, the brake chopper can also be used as either an open or
closed loop, low-side chopper for single quadrant applications. The differential
amplifier circuit is shown on Appendix A, Sheet 3. See Section
1.4.6.1 “Introduction” for a more detailed explanation.
1.4.7
1.4.7.1
Voltage Feedback (Appendix A, Sheets 1, 6 and 7)
INTRODUCTION
Provision has been made for three different types of voltage feedback:
? DC bus voltage feedback – This is required for regulation via the brake chopper or
the active Power Factor Correction (PFC) circuit. It is also used to compensate for
variations in the inverter output voltages that occur due to any ripple on the DC
bus and as a FAULT trip.
? Rectified mains voltage feedback (|VAC|) – This is required for synchronization
and shaping of the input current by the active PFC circuit.
? Inverter output voltage feedback – As well as providing the feedback signal a
comparator circuit is included for sensorless operation.
The first two of these signals are available as isolated signals, whereas the inverter
output voltages are only available when the system is used in the non-isolated manner
DS70096A-page 24
? 2003 Microchip Technology Inc.
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