Evaulation_Engineering_March_2020 - 10

POWER SUPPLIES/LOADS

Sponsored by
Elektro-Automatik

products. For IoT and low-power applications, the Keysight X8712A can correlate
RF and DC events to power consumption.
"At the heart of the X8712A is the popular
N6705C and an SMU that can measure dynamic currents from nanoamps to amps
in a single pass," said product marketer
Bill Griffith. "While the N6705C has been
able to characterize battery run time
accurately, the X8712A helps engineers
understand the actual events that draw
a higher current."
Keysight also serves HEV/EV and
PV test applications with the regenerative RP7900 Series, including 5,000- and
10,000-W bidirectional models, and
customers can stack multiple units to
achieve higher power. "The regenerative
capability enables the energy consumed
to flow back onto the grid cleanly, saving
costs from energy consumption and cooling, while not interfering with the grid,"
Griffith said.
Yet another application that Keysight
serves is battery cell formation and
testing. "The Keysight BT2200 chargedischarge platform is cost-effective and
easily configurable for Li-ion cell forming," Griffith said. "Modular configurations support cells requiring maximum
currents ranging from 6 A to 200 A, with
8 to 256 cells or user channels per chassis.
You can easily deploy different channel
configurations as your cell requirements
and capacities change."
He added, "Keysight's BT2100 Series

self-discharge measurement solutions
provide a revolutionary reduction in
the time to measure and characterize
the self-discharge performance of Li-ion
cells. These lithium-ion self-discharge
measurement solutions determine a cell's
self-discharge by directly measuring its
self-discharge current."
Keysight also offers the N6790 Series
100- and 200-W DC electronic loads,
which add the ability to sink current to
the N6705C DC power analyzer and N6700
Series 1U system power supply for ATE
applications. "The ability to source and
sink current from a single mainframe
simplifies tests and reduces rack space
in an ATE system," said Griffith. "A sophisticated measurement system digitizes
voltage and current at 200 kS/s."
In addition, Keysight offers the E36200
Series 200- and 400-W autoranging supplies, which provide a variety of voltage
and current combinations in a small
bench power supply, Griffith said. For the
highest voltage and current, customers
can internally combine two outputs into
a single one providing 40 A or 120 V.
According to Philipp Weigell, director,
product management, power products, at
Rohde & Schwarz, the company's newest additions are the 2-quadrant R&S
NGL200 and R&S NGM200 power supplies, which are optimized for testing
battery-powered devices and batterymanagement systems. "As soon as the
externally applied voltage exceeds the set

Keysight Technologies E36200 Series 200- and 400-W autoranging power supplies.
Copyright Keysight Technologies. Reproduced with Permission.

EVALUATION ENGINEERING MARCH 2020

nominal voltage, the power supply automatically switches from supply mode to
load mode; current flows into the power
supply," he said.
He also commented that the supplies
offer up to four galvanically isolated,
floating channels. "The circuitry of each
single channel is completely isolated from
the others; there is no connection to the
ground chassis," he said. "This makes it
easy to combine the channels to drive bipolar circuitries that might need +12 V/12 V, for example, and avoids any ground
problems in complex DUTs."
Weigell elaborated on applications. "For
an increasing number of mobile devices,
the battery life is a critical factor," he said.
"Our specialty power supplies R&S NGL200
and R&S NGM200 include battery-simulation features, fast load recovery, and low
ripple and noise, to assist engineers to analyze and optimize their designs."
Weigell added, "In the next few weeks,
our next big introduction will take place.
Without revealing too much, it will
boost your efficiency for higher power
applications."1
Weigell elaborated on the company's
DC power-supply portfolio for test and
measurement applications. "As one of
the leading T&M suppliers for the wireless market, our products address mobile
handset applications as a high priority,"
he said. "The demands of T&M for electric cars, including 48-V technology, is
increasing rapidly. For high-speed digital
design with high power demand on many
input lanes for modern FPGAs the R&S
HMP4040 is ideal."
Keithley products include recently released mid-level power supplies in the company's Series 2230G product offering. The
products help fill out the company's offerings of multichannel supplies, now ranging
from 45 W to 375 W, according to Brad
Odhner, technical marketing manager.
"For the IoT space, I'd highlight our
2281S battery simulator, a favorite tool
for users developing battery powered
products in the IoT space," Odhner said.
"The 2281S has turned into a favorite for
engineers to simply emulate a variety
of batteries, either as a means of spot
checking their product anywhere along
the battery's life, or for testing their device

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