Hardware Design
High-Voltage Hardware Set Components
DRM028 — Rev 0
Designer Reference Manual
MOTOROLA
Hardware Design
67
230-volt dc power supply or an ac line voltage. Either input is supplied
through connector J11. Current measuring circuitry is set up for 2.93
amps full scale. Both bus and phase leg currents are measured. A
cycle-by-cycle over-current trip point is set at 2.69 amps.
The high-voltage ac power stage has both a printed circuit board and a
power substrate. The printed circuit board contains IGBT gate drive
circuits, analog signal conditioning, low-voltage power supplies, power
factor control circuitry, and some of the large, passive, power
components. All of the power electronics which need to dissipate heat
are mounted on the power substrate. This substrate includes the power
IGBTs, brake resistors, current sensing resistors, a power factor
correction MOSFET, and temperature sensing diodes.
Figure 4-5
shows a block diagram.
Figure 4-5. 3-Phase AC High Voltage Power Stage
4.4.1.1 Electrical Characteristics of the 3-Phase AC/BLDC High Voltage Power Stage
The electrical characteristics in
Table 4-2
apply to operation at 25
°
C with
a 160-Vdc power supply voltage.
HV POWER
INPUT
SWITCH MODE
POWER SUPPLY
PFC CONTROL
dc BUS BRAKE
3-PHASE IGBT
GATE
PHASE CURRENT
PHASE VOLTAGE
BUS CURRENT
BUS VOLTAGE
MONITOR
ZERO CROSS
BACK-EMF SENSE
BOARD
ID BLOCK
3-PHASE AC
SIGNALS
TO/FROM
CONTROL
BOARD
POWER MODULE
DRIVERS
MOTOR
TO
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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