FEA
FEAT RE ATURE
POWER ELECTRON C
ONICI S
Power convertermodul e selectio n formedical equipment
en i comes to electroni H re, in stria
thing is m re so important than the s afety of the patient an d the h althcare person to thto them.. Here, industrial power module
r m le manufacturer, Mornsun exam es the core requi ements factu wide input range A
the require andcurre
lmost allmedical equipmentwillhave contactwithpeople andbecause of this rement for pro rentshazard
rotectionfro paramount; these re
a ra ge ofAC/DCModules andDC/DC Convertverters specifically for thismarket sector. The ra ge
ower conve range
range includes single outputAC/DC
modules of 5W(15Wand25Wmodels coming soon), single&dual outputDC/DCconvert of 1W, 2Wanda single output6Wseries. The level of protection of a specific power converter is referred to in respect toMOOP (method of operator protection) andMOPP (method of patient protection). Isolation protection includes creepage/clearance distances, insulation, and protective earths. The company’s products use specifically designed PCB’s to ensure that theymeet creepage
rters ge and clearance re
number of techniques that are needed to meet the specifications forminiature ower converters (Fig 1.). Transformers are designed using tri-ra
re pow ratedwire to prov
Formedical equipmentwith rement.
require dire connection there is a re ovide
multiple levels of insulation to themeet the require
rect patient rement for two
rovide isolation of the patient fromthe equipment in the event of a failure of the AC pow
levels of electrical safety.One level is to isolate the equipment fromthe 230VA supply and the second is aD C to pro
rters have 6KVDC (4.2KV AC) ge, the 1Wand 2W
input to output insulation based on a 240V ACworking input voltage
series products are rated at 1 xMOPP and 2 x MOOP and the 6Wseries is rated at 2 x MOPP. The AC/DCmodule converter series are rated at 2 xMOPP. Ultra-lowleakage
ge current - Lowleakage
current is a core principal of protection in medical electronics, theMornsun range of AC/DCmodules have amaximumleakage current of 80µA and theDC/DC converter series have amaximumpatient leakagekage current of 2 µA.
In addition to safety concerns,medical equipment designersmust also consider a
20 20 OCTOBER 201 BER 2016 | ELEC RO ELECTRONICS CS
/DC converte r VAC
ower
supply.Mornsunmedical specification DC/DC convert
rdous tohealthis requirements are statedin
IEC60601-1
edition3.1.Mornsun, a global pow
versionmanufacturer,has developed romvoltage ges
Power converter module selection for medical equipment
When it comes to electronic medical equipment design there are many aspects to be considered but nothing is more so important than the safety of the patient and the healthcare personnell attending Mornsun examines the core requirements
gewith 9-36V and 18-75V
inputs available,whichmakes this series suitable for battery applications in addition to other standard applications.
convert ensure
Both the AC/DCmodules and theDC/DC rters feature awide operating
roducts are specifically designed to re the excellent reliability required of criticalmedical systems. The latest SM D production techniques are used to ensure highmanufacturing repeatability and this coupledwith the highest quality components prov
temperature range (-40 to 85°C). These pro
ovides aminimumMTBF of 300K hr’s. Based on the quality approach used these products are providedwith a three year warranty.
host of other factorswhen choosing the best power supply for the application. Some of these specifications include input range, ow
req reuirements using a
output voltage, power output, standby rating temperature
power, opera warranties.
TheMornsun ra ge of AC/DCmodules offer a full universal input (85–264V AC) but can also accept awide rangeDC input (100–370VDC). These products also standard
nge 4V rd single outputs of 5V, 12V 15V and 24V. They feature power (0.3Wmax
The 1Wand 2W requirements.
high efficiency (81 re
%max) and lowstandby nominimumloadwith
DC/DC converter series ar e ) tomeet current
designed to have an input froma regulated source and offer inputs of 5V, 12V and 24V with standard
rt rd single (3.3V, 5V, 12V and 15V)
and dual (±5V, ±9V, ±12V and ±15V) outputs. The 6WseriesDC converters have an ultra-
re and pro roduct Figure 1: Figure 1:
The G S-2WR2 miniature power converter module
he G S-2WR2 miniature power converter module
ELEC ELECTROMAGNET CTROMAGNE IC IN ERFERENCE
Medical devices need tomeet the conducted and radiated emissions requirements of EN55011 and this is a challenge prov
ETIC INTERFERENCE re
gewhilst oviding lowleakage
Mornsun converters are designed tomeet Class A as aminimum.
kage and high isolation. re
PLANN NG FOR HE FUT PLANNINGI
specialistmedical pow process of developing
FOR THE FU URE
The development of newand innovative medical electro
forwardrw rdwith pace andMornsun are in the a greater range of
ronics is an area thatmoves re
UTURE re
ower conversion products Figure 2: Figure 2: The LD05-20BxxMU he LD05-20BxxM
to keep in stepwith newand upcoming requirements. The future introduction of the 15Wand 25WAC/DCmodule ranges is part of this development process but in addition re able to offer full or
to this the company are
semi-customproducts for volume requirements.
The products featured in theMornsun medical series are compact and based on industry
ow ry standard footprints and in addition
to use inmedical electronics theymay be used in other applicationswhere a requirement for high isolation and low leakage exists, such applications include electricitymetering andmonitoring, IGBT drivers and photo-voltaic control systems.
Mornsun
www.mornsun.co.uk www.mornsun.co.uk e:
info@powerpaxuk.com / ELECTRONICS ELECTRONICS
edical equipment design there are m ny aspects to be consi ered but atten in
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