beautypg.com

Phase ac high voltage power stage – Motorola M68HC08 User Manual

Page 67

background image

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

F

re

e

sc

a

le

S

e

m

ic

o

n

d

u

c

to

r,

I

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

n

c

.

..