Medical Design Briefs - November 2023 - 29

for communication with the rest of the
system. This can be invaluable during
the design of a power scheme, while engineers
are making their trade-off decisions.
With the power supply able to
monitor key parameters such as voltages,
currents and temperatures, the need for
expensive test equipment is reduced, as
is the setup time.
Once the design is completed and the
system is deployed, continuing to monitor
these parameters can provide early
warning of issues within the system. For
example, an increase in current draw on
a particular module, or a rapid rise in
temperature could be an early warning
of a forthcoming failure elsewhere,
which can be investigated and addressed
before it happens.
As well as enabling communication, PMBus™
also allows many aspects of the power
supply to be configured and controlled,
honing it for a particular application. By
compensating within the power supply, external
components can be reduced or eliminated,
minimizing the size and cost of the
overall solution.
For example, if it is known that an application
has a large complex impedance,
high levels of inrush current can be expected.
Minor firmware modifications can be
used to reduce the rise time of the power
supply; this inrush current can be controlled
with nothing more than a software
modification.
In many applications, the current capability
of an output module may be significantly
more than the application requires.
To enhance safety (for example when a rail
requiring 3 A is powered by a 20 A-capable
module), PMBus may also be used to reduce
the current limit of the module to suit
the application/use case.
n Configurable Technology
For example, Advanced Energy's
CoolX®1800 (part of the Excelsys product
line) is an 1800-W-rated configurable
modular power supply for medical applications
with efficiency levels as high as 91
percent. Intended for use in a wide variety
of applications such as clinical diagnostic
equipment, medical lasers, dialysis,
and radiology, CoolX1800 medical
units are approved to IEC 60601-1 3rd
Edition offering 2 x MOPP (Means of Patient
Protection) and IEC60601-1-2 4th
Edition for EMC.
Housed in a compact 1U high package,
each unit has six slots available for
Medical Design Briefs, November 2023
www.medicaldesignbriefs.com
29
output modules, giving the ability to be
configured with up to 12 separate outputs,
all of which are isolated from the
input (1,850 VAC). An additional 23.5
W always ON auxiliary power output is
provided for system standby functions.
A completed power supply measures
just 262 × 127 × 41 mm (10.5 × 5 in. ×
1U). MTBF exceeds 200,000 hours and
a five-year warranty is standard. A total
of 13 different output modules are
available offering single and dual outputs,
high power, high voltage, and wide
trim capabilities. The flexibility of the
CoolX1800 is significantly enhanced by
the inclusion of analog and digital management
via the monitoring and control
capability of PMBus.
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http://info.hotims.com/84485-754 http://www.medicaldesignbriefs.com
Medical Design Briefs - November 2023

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