IRPT1058

page 2

The IRPT1058C

provides the complete

conversion function for a 0.75 hp (0.56 kW) variable frequency,

variable voltage, AC motor controller. The

combines a power module IRPT1058A with a Driver-Plus Board

IRPT1058D. Figure 1 shows the block diagram of the

within an AC motor control system.

The power module contains a single-phase input bridge

rectifier, 3-phase IGBT inverter, current sense shunts, and a

thermistor. It is designed for easy mounting to a heat sink. The

Driver-Plus Board contains DC link capacitors, capacitor soft

charge function using NTC thermistor, surge suppression MOV,

IGBT gate drivers, DC bus voltage and current feedback signals,

protection circuitry and local power supply. It is designed to mate

with a controller board through a single row header. Terminal

blocks are provided on the Driver-Plus Board for all end user line

input and motor output.

Output power is Pulse-Width Modulated (PWM) 3-phase,

variable frequency, variable voltage controlled by an externally

generated user-provided PWM controller for inverter IGBT

switching. The power supply offers the user non-isolated 5V and

15V to power the micro-controller.

The IRPT1058C offers several benefits to the drive

manufacturer listed below:

interconnection, gate drive, local power supply, thermal

sensing, current sensing and protection.

match the operating characteristics of the power

semiconductors. This allows power losses to be minimized and

power rating to be maximized to a greater extent than is

possible by designing with individual components.

semiconductor losses and junction temperature.

assembly.

[

specifications and ratings are given for system

input and output voltage and current, power losses and heat sink

requirements over a range of operating conditions.

system ratings are verified by IR in final testing.]

The IRPT1058A Power Module

The IRPT1059A Power Module, shown in figure 2, is a chip

and wire epoxy encapsulated module. It houses input rectifiers

output inverter, current sense shunts and NTC thermistor. The

single-phase input bridge rectifiers are rated at 800V. The

inverter section employs 600V, short circuit rated, ultrafast

IGBTs

and ultrafast freewheeling diodes. Current sensing is

achieved through 75m

Ω low inductance shunts provided in the

positive and negative DC bus rail. The NTC thermistor

provides temperature sensing capability. The lead spacing on the

power module meets UL840 pollution level 3 requirements.

The power circuit and layout within the module are carefully

designed to minimize inductance in the power path, to reduce

noise during inverter operation and to improve the inverter

efficiency. The Driver-Plus Board required to run the inverter

can be soldered to the power module pins, thus minimizing

assembly and alignment. The power module is designed to be

mounted to a heat sink with two screw mount positions, in order

to insure good thermal contact between the module substrate and

the heat sink.

System Description

Figure 2. IRPT1058C Power Module