AN1524 Freescale Semiconductor / Motorola, AN1524 Datasheet - Page 3

• Manufacturer Part Number: AN1524
• Description: AC Motor Drive Using Integrated Power Stage
• Manufacturer: Freescale Semiconductor / Motorola

drives for both low voltage (up to 240 VAC) and high voltage
(up to 480 VAC). Table 1 contains the part numbers and the
Stage family of modules. A photograph of this demo board is
included at the end of the text as shown in Figure 13. The
purpose of this demo board is to provide a vehicle for
evaluating the performance of these modules and to enable
customers to rapidly develop proof of concept systems. The
board contains the integrated power stage module, passive
power components and gate drive. It also contains a current
amplifier, temperature amplifier and voltage divider for
monitoring
comparators and a programmable logic device provide
instantaneous fault protection.
Power Circuit
Figure 4. Three phase or single phase AC power is connected
to the input terminals R, S, and T. The order of the input
connections makes absolutely no difference. The Integrated
Power Stage (U1) rectifies the AC and provides a DC output
at P1 (1) and N1 (25). Negative temperature coefficient
thermistors (R1 and R2) are used to limit the inrush current
and protect the rectifier diodes from excessive surge current.
Two thermistors with a cold resistance of 1
IPS AC MOTOR DRIVE DEMO BOARD CIRCUITRY
MOTOROLA
There is a family of six modules for 1, 2 and 3 hp motor
A demo board has been developed for the Integrated Power
The power electronics for the demo board is shown in
V CES
V CES
(Volts)
(Volts)
drive
1200
600
status.
MHPM7A8A120A
Over–current,
Freescale Semiconductor, Inc.
Figure 3. Integrated Power Stage Module Illustration
8
For More Information On This Product,
Table 1. Integrated Power Stage Ratings
are sufficient to
Go to: www.freescale.com
over–voltage
MHPM7A12A120A
12
voltage and current ratings for the Integrated Power Stage
modules.
protect the low voltage systems. Alternatively, a relay and
precharge resistor could be used to limit inrush current. Both
upper and lower branches of the DC buss are split between
the rectifier and brake for flexibility.
frequency performance. Capacitors C2 and C3 are the DC
buss capacitors. Jumpers are provided to configure these
capacitors in series or parallel. The PC board is designed for
both high voltage and low voltage systems. All the values
shown are for the low voltage configuration.
motor. Exchanging the order of the connections will reverse
the direction of the motor rotation. The motor rotation can also
be reversed by software control. A connector is also provided
for dynamic brake connection.
through one of the module standoffs. The heatsink should be
earth grounded for safety reasons. The clearance and
creepage distances for the printed circuit board are designed
to meet the spacing requirements of UL 840 and IEC 335 for
480 VAC drives. The AC drive standards UL 508, UL 508C,
VDE 0110, and VDE 0160 refer to these standards or use
similar clearance tables.
MHPM7A16A120B
MHPM7A15A60A
Capacitor C1 is a polypropylene capacitor for high
The output terminals U, V, and W are connected to the
The heatsink of U1 is earth grounded using a small screw
I C (Amps)
15 – 16
MHPM7A20A60A
20
MHPM7A30A60B
30
AN1524
3