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System overview, Isolated gate drive and ipm interface – Avago Technologies ACPL-224-500E User Manual

Page 47

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AV02-4387EN

44

Avago Technologies

Inverter Design Using Gate Drive

and Current Sense Optocouplers

Figure 1. Isolation Circuits for Power Control – System Overview

System Overview

A typical motor drive and power

control system shown in Figure 1

requires isolation between the high

voltage devices (IGBT/MOSFET) and

the low voltage devices (micro-con-

troller). In addition to meeting the

severe
requirements for the isolation func-

tion, Avago Technologies optocou-

plers provide customized function-

ality such as direct gate drive for

IGBTs or power MOSFETs, and analog

isolation for motor current sensing,

voltage sensing, speed measure-

ment, and position measurement.

Isolated Gate Drive and IPM Interface

and IPM interface optocouplers

meet stringent industrial require-

ments with critical performance:
• Minimum Common Mode Rejec-

tion: 10 kV/

µs slew rate at 1,500 V

peak transients

• Wide Operating Temperature

Range: -40°C to +85°C

• Over Current Protection and Fault

Feedback (HCPL-316J)

• Safety Standards Certifications:

UL, CSA, IEC/EN/DIN EN 60747-5-2

• Fast Switching Speeds: 500 ns

range (see detailed part number

specifications)

• Wide Supply Voltage Range: 15 V

to 30 V

Many motor drive and power control

systems use pulse width modulation

switching of power devices to gen-

erate a three phase variable voltage

and variable frequency power

source. High performance motor

drives require precision timing

for turning on and turning off the

power devices on the inverter.

The micro-controller that controls

the turn-on and turn-off of these

power devices needs to be isolated

from the high voltage inverter side.

Avago Technologies offers a variety

of optocouplers that have built-in

gate drive capability. For solutions

that require only a simple isolation

interface, Avago provides Intelligent

Power Module (IPM) interface opto-

couplers. All of Avago’s gate drive

VOLTAGE

SENSE

MICRO-

CONTROLLER

CURRENT

SENSE

CURRENT

SENSE

GATE

DRIVE

GATE

DRIVE

B

A

3- PHASE

OUTPUT

U+

U-

V+

V-

W+

W-

+HV

C

-HV

ANALOG

ISOLATION

MOTOR SPEED, POSITION

A, B, C

U+, U-, V+, V-, W+, W-

GATE

DRIVE

GATE

DRIVE

GATE

DRIVE

GATE

DRIVE

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