Magnetics Business & Technology - March/April 2023 - 20

PRODUCT NEWS
Murata Develops New Components for Power Electronics Design
The world's first chip-type noise suppression components to have 20A current rating, says Murata
Product designers have several new capabilities available to them
from components developed by Murata where, in each case, magnetics
aspects are key to their advanced functionality. The components
are chip ferrite beads with high current capacity for noise
suppression, shown above, open-loop current sensors for industrial
systems and broadband inductors for the automotive market.
The BLE32SN series of chip ferrite beads are the world's first
chip-type noise suppression components to have 20A current
rating, says Murata. They are designed to provide noise suppression
in circuits with large current flows such as the battery charging
systems and powertrains of electric vehicles as well as in industrial
equipment.
Previously, says the company, there was no chip-type noise suppression
filter that could attain a 20A current rating. This meant that
multiple chips had to be mounted in parallel, which added to the
bill-of-materials costs and took up valuable board real estate.
By leveraging advanced structural simulation techniques, Murata
engineers have been successful in creating a proprietary internal
electrode design. This increases the electrode volume of these
chips compared with those using a conventional arrangement. It
has resulted in a significant lowering of their DC resistance characteristics.
The
new MRD
series of open-loop
current sensors
for industrial
systems integrate
high-performance
tunnel magnetoresistive
elements,
enabling precision
measurement with
regard to both DC
and AC currents
20 Magnetics Business & Technology * March/April 2023
The new LQW43FT series is a three-module line of broadband
inductors developed for the automotive market. The 1812 size is
the world's smallest inductor for Bias-T circuits, says Murata. The
inductors leverage the company's proprietary material and coil
structure technologies to provide superior performance in the low
frequency band up to 100 MHz, says Murata. They have an inductance
range of 10 μH to 22 μH and high current of 700 mA. Their
high impedance over a broad range can decrease required inductors.
With the increased adoption of ADAS, the demand for PoC
cables capable of carrying both signals and power is also rising. To
separate the two, multiple inductors are typically combined to form
a broadband and high impedance filter.
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up to 40A, as well as maintaining stable characteristics across an
extensive temperature range.
Their coreless structure does not exhibit hysteresis effects or
saturation issues which are typical side-effects with an iron core. It
also results in reduced size and weight, as well as making mounting
easier. Their proprietary differential measurement with two TMRbased
elements gives immunity against external magnetic stray
fields. This makes them suitable for use in application environments
with high levels of electromagnetic noise such as photovoltaic
inverters, DC-DC converters, EV charging infrastructure and power
conditioning systems.

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Magnetics Business & Technology - March/April 2023

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