Page 6 - PEN eBook December 2022
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COVER STORY — DESIGN Cover Story — Design
presses generally require the use of a selection of the following elements for safe operation:
▶ Isolation amplifiers, analog-to-digital converters (ADCs)
▶ Isolation of digital circuits
▶ Interfaces/bus isolation — RS232, RS485, CAN, Interbus, Profibus
▶ Measurement and data acquisition
All of these applications have one thing in common: the isolation of their supply voltage from the
bus voltage. Why should you galvanically isolate a supply from a bus or from switching components?
Galvanic isolation prevents transient interference from the supply voltage from propagating into
the bus and disrupting its operation.
MICROMODULE WITH HIGH EFFICIENCY
As an isolated DC/DC converter, a power module with galvanic isolation provides a reliable supply
for an ADC in industrial applications. The isolated µModule 1769205132 of the Fixed Isolated
MicroModule (FIMM) series uses chiplet SiP technology to reduce the dimensions by 80%, resulting
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Space-Saving and Easy in a module with the dimensions 9 × 7 × 3.1 mm . The board space requirements are reduced by
more than 50% compared with a standard SMT-8 power module (9 × 7 mm versus 13.2 × 12.2 mm ).
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to Use: Interference- The MagI³C power module 1769205132 is based on a full-bridge topology. The module integrates
a switching power stage, control circuitry, rectifier diodes, input and output capacitors, and a
Free Power Supply with transformer (Figure 1). Because there is no feedback path from the output to the input, the duty
Isolated MicroModules
Modern industrial plants place high demands
on the reliability and interference immunity
of power supplies. Typically, the industrial
components are supplied by DC bus systems.
This article presents a low-interference
bipolar supply in the low-voltage range.
By Timur Uludag, senior technical marketing manager in the MagI³C Power
Modules business unit at Würth Elektronik eiSos Group
Industrial plants like warehouse logistics, filling plants, rolling mills, conveyor belts, and printing Figure 1: Structure of the isolated MicroModule 1769205132 of the FIMM series. It comprises a semiconductor IC, rectifier
diodes, input and output capacitors, and a transformer.
6 DECEMBER 2022 | www.powerelectronicsnews.com DECEMBER 2022 | www.powerelectronicsnews.com 7
