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dsPICDEM? MC1H 3-Phase High Voltage Power Module
1.2.6
1.2.6.1
Power Module Feedback Signals
INTRODUCTION
The power module may be operated in two distinct ways with respect to signal
isolation. This effects which of the feedback signals are available. All feedback signals
are preconditioned and scaled within the power module. Which particular set of
feedback signals the user requires will change depending on the application. Typically
industrial applications tend to use isolated signals for both safety, noise and
performance reasons. More cost-sensitive applications, and especially those that
have little or no user input, tend to run the control electronics live and use non-isolated
feedback signals.
1.2.6.2
ISOLATED FEEDBACK
TABLE 1-2:
ISOLATED SCALING
Feedback Signal
Inverter Output (R and Y) Hall Current Sensor
DC Input Hall Current Sensor
DC Bus Voltage via SPI? Channel
Rectified AC Voltage (|VAC|) via SPI Channel
Scaling
2.4 A/V with 2.5V = 0A
4.8 A/V with 2.5V = 0A
230 = 410V (1LSB = 1.78V)
230 = 369V (1LSB = 1.60V)
1.2.6.3
NON-ISOLATED FEEDBACK
As the system is delivered, access is not given to the non-isolated feedback signals to
ensure user safety. If an experienced user wishes to access these signals they should
read Section 1.4 “Detailed Description of Operation” along with Section
once the isolation barrier is bridged, all signals can no longer be considered to be
isolated from the power circuit. When operating in the non-isolated configuration, the
Hall current sensors and SPI voltage feedback signals are also available.
The scaling for the signals as the system is delivered is given below. For details of
TABLE 1-3:
NON-ISOLATED SCALING
Feedback Signal
R, Y, B Inverter Leg Shunts
Scaling
2.4 A/V with 2.5V = 0A*
DC Bus Shunt 2.38 A/V with 2.5V = 0A*
Brake Chopper Shunt 1.09 A/V
DC Bus Voltage 91.0 V/V
|VAC| Voltage 81.9 V/V
R. Y, B Inverter Output Voltages 92.0 V/V
* If a large rate of change of current occurs due to the use of a load with low inductance, the
voltage across the self-inductance of the shunts will cause an additional shunt voltage
that will add to the shunt feedback signals.
DS70096A-page 12
? 2003 Microchip Technology Inc.
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