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dsPICDEM? MC1H 3-Phase High Voltage Power Module
? U16, U17 – Low current (1.6 mA), medium speed (1 MHz) optocouplers to provide
the isolation for the clock and data lines.
? R149, R150 – Series resistors that help to set the current through the optocoupler
emitters. They are sized to allow a minimum of 1.8 mA to flow.
? C64, C70 – Speed up capacitors to help reduce the effect of the optocoupler's
emitter capacitance at high data rates.
? R170, R171 – Pull-up resistors for the open collector outputs of U16 and U17.
1.4.7.3
INVERTER OUTPUT VOLTAGE FEEDBACK AND SENSORLESS
DETECTION
Knowledge of the actual inverter output voltage is useful for two different uses. The
first is for accurately compensating for output voltage errors due to dead time and
power device voltage drops. This can be especially important for high current low
voltage systems with high PWM frequencies and high performance requirements. The
second use is for back EMF sensing for sensorless position detection schemes for
Brushless Permanent Magnet (BPM) and other types of motors.
The hardware for providing this is now discussed with reference to the RED phase.
The other two phases have identical circuits.
? R20, R21 and R144 – A resistor divider chain with scaling, the same as the DC
voltage feedback. The same scaling is required in order that the “back EMF
crossing” detection works correctly. The scaling is such that the maximum
expected output voltage will give 4.5V.
? C61 – This provides filtering of the inverter output voltage in combination with
R20, R21 and R144.
? D41 – This provides a clamp to ensure R_VPH_SENSE is protected.
? U31-B – A comparator used to provide a simple sensorless position detection
scheme for BPM motors. Whenever R_PH crosses half the DC bus voltage, an
output transition will occur. The R_CROSSING signal is only valid during regions
of the electrical cycle, where the RED phase output current is zero, so that the
back EMF of the motor determines the voltage of R_VPH. Thus the scheme is
only suitable for use on BPM motors where 120 degree conduction scheme is
used. Careful decoding of all three crossing signals and appropriate angle
interpolation is required for correct commutation. An alternative method for
commutation feedback must be used near zero speed where the back EMF is
insufficient for the scheme to work.
? R143, R147 – These provide a small amount of hysteresis to prevent oscillation of
R_CROSSING.
? R142 – The pull-up resistor for the open-collector output of the comparator.
DS70096A-page 26
? 2003 Microchip Technology Inc.
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