TEChNOLOgy REviEW > continued
Why you need to know your MOPPS from your MOOPS when choosing a medical power supply
leakage current In any AC-connected power supply there will be leakage current caused by capacitive coupling across power transformers and by the Y-class filter capacitors that are necessary to maintain EMC performance. In IEC/ EN 60601-1 the leakage current limits are the same for MDs of all classes: no-indirect patient contact, direct patient contact, and direct patient contact with the heart. The limits are defined for both normal operation and under fault conditions, as shown in Figure 3 (right).
It should be noted that where medical products are to be sold in the North American market, conformance to UL 60601-1 dictates that the maximum allowable leakage current is 0.3mA, rather than 0.5mA.
Figure 3: IEC/EN 60601-1 leakage current limits. Current
Earth discharge current Cabinet discharge current 0.5mA 0.1mA Normal operation Failure mode 1 1.0mA 0.5mA
Where a power supply conforming to IEC/EN 60950 is selected to power an IVD, the leakage current limits of IEC/EN 60601-1 must still be met.
Figure 4: Aimtec, Delta, Emerson, Mean Well, Murata-PS and Power One and now all offer medical power supplies with 2 x MOPP qualification AvA Supplier
Aimtec Aimtec Aimtec Aimtec Aimtec Aimtec Aimtec Delta Delta
Emerson Emerson Emerson Emerson Emerson Emerson Emerson Emerson Emerson Emerson Emerson Emerson Emerson Emerson Emerson Emerson
Mean Well Mean Well Mean Well Mean Well Murata-PS Murata-PS Power-One
Model
AMEL5-MAZ AMEL10-MAZ
AME 15/30/40-MAZ AMEL15-MAZ
AMEx 15/30/40-MAZ AMEL20-MAZ
AMEOx 30/40-MAZ MDS 060/90/150
MDS 040/065/100/400 NPS-M 20/40/60 NPT-M 40
LPS-M LPT-M 40/60/100 LPS-M 50
NLP-M 65/110 LPT-M 100 TLP-M 150 LPS-M 170
LPS-M/LPQ-M 200 NLP 200 LCC 200
NTS-M 500
LCM 300/600/1500 µMP iMP iVS DA-M 12/18 DPS-M 50
MSP 100/200/300
MPx 30/45/65/200/300 GSM 18/25/36/40/60/90 RPx 60/75/160/300 MVAD 040/065 MVAC 250/400
MBC 40/60/150/201/250/300
www.avnet-abacus.eu EN 60601-1
Primary to Secondary 1MOOP 2MOOP 2nd Ed 2nd Ed 2nd Ed MOOP 2nd Ed 2MOPP 2MOPP 2MOPP 2MOPP 2MOPP 2MOOP 2MOOP 2MOOP 2MOOP 2MOPP 2MOPP 2MOOP 2MOOP 2MOOP 2MOPP 2MOPP 2MOPP 2MOOP 2MOPP 2MOPP 2MOPP 2MOPP 2MOOP 2MOOP 2MOPP
6 Insulation
4kVac 4kVac 4kVac 4kVac 4kVac 4kVac 4kVac 4kVac 4kVac 4kVac 4kVac 4kVac 3kVac 3kVac 3kVac 3kVac 4kVac 4kVac 3kVac 3kVac 3kVac 4kVac 4kVac 4kVac 3kVac 4kVac 4kVac 4kVac 4kVac 3kVac 3kVac 4kVac
Style
Board Mount Board Mount Board Mount Board Mount Panel Mount Board Mount Open frame External
Panel Mount Open frame Open frame Open frame Open frame Open frame Open frame Open frame Open frame Open frame Open frame Box type
Panel Mount Front End
Configurable External External
Panel Mount Open frame External External
Open frame Open frame Open frame
focus magazine - issue 17
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