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How to Improve the Safety of Medical Device Power System?

CONTENTS


With the continuous development of the medical industry, the technology and quality of medical equipment is improving, which has led to the continuous innovation and development of its upstream industry chain products. As the “heart” of the equipment, the demands and requirements of medical power supply are also increasing. How to match the development of the medical industry from the aspects of product performance, delivery, quality, safety regulations, certification, and so on is what medical power supply suppliers need to consider and achieve.

Medical Device Supply Chain.jpg



1. “Safety” and “Compliance”: the Foundation of Medical Device Power Supply

The most important criteria of medical device power supply are safety and compliance: safety depends on whether the power supply can meet the requirements of medical industry certification standard EN60601, including leakage current, safety distance, etc.; compliance is reflected in whether the production and materials can ensure sufficient consistency, whether the process control is reasonable and effective, and whether the outflow of nonconforming products is strictly prohibited.


*Safety standards include:

IEC 60601-1 General Requirements for basic safety and basic performance;

IEC 60601-1-2 electromagnetic interference requirements and tests.


Compliance standards include safety and EMC. Safety regulations are mandatory criteria, and the product whether meets the standard requirements or not depends on its design. EMC is a compatible criterion. The power supply itself must meet the requirements. At the same time, it is also required to consider the comprehensive design of the whole system of the layout, connecting wire, shielding, and so on. In particular, vitro diagnostic equipment includes many components such as circuit, waterway, structure, connecting wire, display, electric, heating, cooling, and so on, so that EMC should be considered at the beginning of the design to avoid expensive testing and rectification costs in the later stage.



2. How to Design High-Quality Medical Device Power Supply: a Brief Analysis of Design

Meet medical certification EN60601

Taking the LOF series as an example, this product has a 5-year warranty and its safety specification meets the IEC / EN / ES 60601 Standard, the leakage current is less than 0.1mA which is suitable for BF types of medical devices, and the isolation safety distance (creepage and clearance) meet the medical standard.

MORNSUN High-Quality Medical Device Power Supply: a Brief Analysis of Design.jpg


Outstanding EMC design

Medical power supply requirements of ultra-low leakage current, high safety distance and ability of high-voltage withstand and miniaturization, high power density design are mutual constraints. Most products on the market compromise on EMI to meet only the CLASS A standard, which greatly increases the risk of interference from power supply products to other functional circuit modules inside the medical device.


The conducted emission and radiated emission of the LOF series meet class B:

A. The input EMI filter module, the PFC module, and the main power module are respectively arranged in a centralized manner and effectively isolated by a radiator (grounding), which minimizes EMI interference, reduces some EMC components, and optimizes space.

MORNSUN LOF Series EMC Design.jpg

B. The input terminal is designed with a flat line common mode inductor, fully automatic winding and without overlapping, with a small capacitance between turns, and has a good impedance balance. EMI performance is much better than traditional magnetic ring common mode inductor and provides small size and beautiful appearance.


C. It is designed with PFC function and is easy to meet the standard of IEC / EN61000-3-2 CLASS A and CLASS D. The electrostatic requirements meet the latest standard of 8kV/15kV.


The conducted radiation waveform is as follows, with sufficient margin:

The conducted radiation waveform.jpg


When designing a good product, the process of improving production efficiency and reducing process complexity will be considered in advance, which can not only reduce labor cost but also greatly improve production efficiency and product quality, thus reducing the follow-up debugging of medical devices.

MORNSUN LOF series with new design controls the product quality precisely from the details.jpg

LOF series with new design controls the product quality precisely from the details:

Our transformer adopts an open-frame design, no flying wire, and the common-mode inductor with the base design, which reduces the complexity of production and improves production efficiency. 

The traditional compact design leads to the electrolytic capacitor being heated up by the transformer and diode nearby. The thin & long capacitor we choose can keep away from the heat source and solves this problem well.


The special application environment of medical equipment determines its preciseness. When selecting a medical power supply, it is necessary to consider not only safety regulations and EMC performance, but also the compatibility between structure and EMC in the design stage, as well as product reliability, supply stability, cost, technical support, and other factors.



3. Typical Application Cases of Medical Device Power Supply

Typical scheme I: Sputum extractor

MORNSUN Solution Typical scheme I: Sputum extractor.jpg

The main inductive loads of the Sputum extractor are relays, motors, pumps, etc., which are prone to spike interference. It is required that the power supply has sufficient anti-interference ability to ensure that the power supply can work stably and reliably for a long time.


The front end of MORNSUN’s LOF series power supply has more than two levels of differential mode and common mode filtering, which can effectively suppress peak interference. The power taken from the LOF output to supply inductive loads has been effectively filtered to eliminate the interference, which may result in conducted emission and radiated emission not passing the standard if it leaked into the supply network.

It should be noted that loads powered by mains power supply directly and loads with long connecting lines need to be further increased its filtering and reasonable wirings to avoid interference emitted from the connecting lines.


Typical scheme II: Ventilator


MORNSUN Solution Typical scheme II: Ventilator.jpg



The ventilator is a product contact directly with patients, and the safety protection level shall meet the isolation requirements of 2x MOPP. MORNSUN LO-MU series complies with IEC60601-1, EN60601-1, and other medical standards, and meets 2x MOPP. The patient leakage current is less than 75uA, and the noise is less than 25dB, ensuring a quiet and comfortable environment.


Meanwhile, MORNSUN’s LOF series is a high-power AC / DC power supply with a PFC function, which meets the harmonic requirements of IEC 61000-3-2.




4. Deep-Insight of Industry Trends and Market Demands

Safety and reliability are the primary concerns for the requirements of medical device power supply. Secondly, EMC, delivery, cost, and other factors need to be considered. Based on the comprehensive power supply R&D platform, MORNSUN works closely with clients and make research on the market demand and requirements of the medical device, response quickly, is committed to providing more reliable and stable power solutions to promote further development of the medical industry.

MORNSUN One stop slutions of power supplies.jpg

Series Power(W) Vin(VAC) Vin(VDC) Vout(VDC) Iout No. of Outputs Isolation Package Dimension(mm) Footprint & 3D Markings Datasheet Sample Buy
H0305S-1WR2 1 - 3.3 5 - 1 6000VDC SIP 19.50*9.80*12.50
-
H0503S-1WR2 1 - 5 3.3 - 1 6000VDC SIP 19.50*9.80*12.50
H0505S-1WR2 1 - 5 5 - 1 6000VDC SIP 19.50*9.80*12.50
H0512S-1WR2 1 - 5 12 - 1 6000VDC SIP 19.50*9.80*12.50
H0515S-1WR2 1 - 5 15 - 1 6000VDC SIP 19.50*9.80*12.50
H1205S-1WR2 1 - 12 5 - 1 6000VDC SIP 19.50*9.80*12.50
H1212S-1WR2 1 - 12 12 - 1 6000VDC SIP 19.50*9.80*12.50
H1215S-1WR2 1 - 12 15 - 1 6000VDC SIP 19.50*9.80*12.50
H2405S-1WR2 1 - 24 5 - 1 6000VDC SIP 19.50*9.80*12.50
H2412S-1WR2 1 - 24 12 - 1 6000VDC SIP 19.50*9.80*12.50
H2415S-1WR2 1 - 24 15 - 1 6000VDC SIP 19.50*9.80*12.50
LDE45-20B05 40 85-264 100-370 5 8A 1 4000VAC DIP 87.00*52.00*29.50
LDE45-20B12 45 85-264 100-370 12 3.8A 1 4000VAC DIP 87.00*52.00*29.50
LDE45-20B15 45 85-264 100-370 15 3A 1 4000VAC DIP 87.00*52.00*29.50
LDE45-20B24 45 85-264 100-370 24 1.9A 1 4000VAC DIP 87.00*52.00*29.50
LDE45-20B48 45 85-264 100-370 48 0.94A 1 4000VAC DIP 87.00*52.00*29.50
LH05-13B03 4 85-305 100-430 3.3 1250mA 1 3000VAC DIP 55.0*45.0*21.0
LH05-13B05 5 85-305 100-430 5 1000mA 1 3000VAC DIP 55.0*45.0*21.0
LH05-13B09 5 85-305 100-430 9 550mA 1 3000VAC DIP 55.0*45.0*21.0
LH05-13B12 5 85-305 100-430 12 420mA 1 3000VAC DIP 55.0*45.0*21.0
LH05-13B15 5 85-305 100-430 15 330mA 1 3000VAC DIP 55.0*45.0*21.0
LH05-13B24 5.5 85-305 100-430 24 230mA 1 3000VAC DIP 55.0*45.0*21.0
LH25-20B05MU 20.5 85-264 100-370 5 4100mA 1 4000VAC DIP 70.0*48.0*23.5
LH25-20B12MU 25 85-264 100-370 12 2100mA 1 4000VAC DIP 70.0*48.0*23.5
LH25-20B15MU 25 85-264 100-370 15 1600mA 1 4000VAC DIP 70.0*48.0*23.5
LH25-20B18MU 25 85-264 100-370 18 1400mA 1 4000VAC DIP 70.0*48.0*23.5
LH25-20B24MU 25 85-264 100-370 24 1100mA 1 4000VAC DIP 70.0*48.0*23.5
LHE10-20D0512-02ER2 10 85-264 100-370 5,12 1500mA,200mA 2 4000VAC DIP 62.00*45.00*30.00
-
LHE10-20D0524-02ER2 10 85-264 100-370 5,24 1000mA,200mA 2 4000VAC DIP 62.00*45.00*30.00
-
LHE60-23B05 50 85-305 100-430 5 10000mA 1 4000VAC DIP 109.00*58.50*30.00
LHE60-23B12 60 85-305 100-430 12 5000mA 1 4000VAC DIP 109.00*58.50*30.00
LHE60-23B15 60 85-305 100-430 15 4000mA 1 4000VAC DIP 109.00*58.50*30.00
LHE60-23B24 60 85-305 100-430 24 2500mA 1 4000VAC DIP 109.00*58.50*30.00
LHE60-23B48 60 85-305 100-430 48 1250mA 1 4000VAC DIP 109.00*58.50*30.00
LM100-23B05 90 85-305 120-430 5 18A 1 4000VAC - -
LM100-23B12 102 85-305 120-430 12 8.5A 1 4000VAC - -
LM100-23B15 105 85-305 120-430 15 7.0A 1 4000VAC - -
LM100-23B24 108 85-305 120-430 24 4.5A 1 4000VAC - -
LM100-23B36 100.8 85-305 120-430 36 2.8A 1 4000VAC - -
LM100-23B48 110.4 85-305 120-430 48 2.3A 1 4000VAC - -
LO45-20B03MU 26.4 85-264 100-370 3.3 8A 1 4000VAC Open frame 76.20*50.80*26.50
LO45-20B03MU-C 26.4 85-264 100-370 3.3 8A 1 4000VAC Enclosed 91.40*60.50*33.30
LO45-20B05MU 40 85-264 100-370 5 8A 1 4000VAC Open frame 76.20*50.80*26.50
LO45-20B05MU-C 40 85-264 100-370 5 8A 1 4000VAC Enclosed 91.40*60.50*33.30
LO45-20B12MU 45 85-264 100-370 12 3.75A 1 4000VAC Open frame 76.20*50.80*26.50
LO45-20B12MU-C 45 85-264 100-370 12 3.75A 1 4000VAC Enclosed 91.40*60.50*33.30
LO45-20B15MU 45 85-264 100-370 15 3A 1 4000VAC Open frame 76.20*50.80*26.50
LO45-20B15MU-C 45 85-264 100-370 15 3A 1 4000VAC Enclosed 91.40*60.50*33.30
LO45-20B24MU 45 85-264 100-370 24 1.875A 1 4000VAC Open frame 76.20*50.80*26.50
LO45-20B24MU-C 45 85-264 100-370 24 1.875A 1 4000VAC Enclosed 91.40*60.50*33.30
LO45-20B30MU 45 85-264 100-370 30 1.5A 1 4000VAC Chassis 76.20*50.80*26.50
LO45-20B30MU-C 45 85-264 100-370 30 1.5A 1 4000VAC Enclosed 91.40*60.50*33.30
LO45-20B36MU 45 85-264 100-370 36 1.25A 1 4000VAC Open frame 76.20*50.80*26.50
LO45-20B36MU-C 45 85-264 100-370 36 1.25A 1 4000VAC Enclosed 91.40*60.50*33.30
LO45-20B48MU 45 85-264 100-370 48 0.94A 1 4000VAC Open frame 76.20*50.80*26.50
LO45-20B48MU-C 45 85-264 100-370 48 0.94A 1 4000VAC Enclosed 91.40*60.50*33.30
LO65-20B03MU 33 85-264 100-370 3.3 10A 1 4000VAC Open frame 76.20*50.80*26.50
LO65-20B03MU-C 65 85-264 100-370 3.3 10A 1 4000VAC Enclosed 91.40*60.50*33.30
LO65-20B05MU 50 85-264 100-370 5 10A 1 4000VAC Open frame 76.20*50.80*26.50
LO65-20B05MU-C 50 85-264 100-370 5 10A 1 4000VAC Enclosed 91.40*60.50*33.30
LO65-20B12MU 65 85-264 100-370 12 5.42A 1 4000VAC Open frame 76.20*50.80*26.50
LO65-20B12MU-C 65 85-264 100-370 12 5.42A 1 4000VAC Enclosed 91.40*60.50*33.30
LO65-20B15MU 65 85-264 100-370 15 4.34A 1 4000VAC Open frame 76.20*50.80*26.50
LO65-20B15MU-C 65 85-264 100-370 15 4.34A 1 4000VAC Enclosed 91.40*60.50*33.30
LO65-20B24MU 65 85-264 100-370 24 2.71A 1 4000VAC Open frame 76.20*50.80*26.50
LO65-20B24MU-C 65 85-264 100-370 24 2.71A 1 4000VAC Enclosed 91.40*60.50*33.30
LO65-20B36MU 65 85-264 100-370 36 1.81A 1 4000VAC Open frame 76.20*50.80*26.50
LO65-20B36MU-C 65 85-264 100-370 36 1.81A 1 4000VAC Enclosed 91.40*60.50*33.30
LO65-20B48MU 65 85-264 100-370 48 1.36A 1 4000VAC Open frame 76.20*50.80*26.50
LO65-20B48MU-C 65 85-264 100-370 48 1.36A 1 4000VAC Enclosed 91.40*60.50*33.30
LOF350-20B12-C 300 90-264 127-370 12 25A - 4000VAC - -
LOF350-20B15-C 325 90-264 127-370 15 21.67A - 4000VAC - -
LOF350-20B18-C 324 90-264 127-370 18 18A - 4000VAC - -
-
LOF350-20B19-C 324.9 90-264 127-370 19 17.1A - 4000VAC - -
-
LOF350-20B24-C 350.4 90-264 127-370 24 14.6A - 4000VAC - -
LOF350-20B27-C 351 90-264 127-370 27 13A - 4000VAC - -
LOF350-20B36-C 350.28 90-264 127-370 36 9.73A - 4000VAC - -
LOF350-20B48-C 350.4 90-264 127-370 48 7.3A - 4000VAC - -
LOF350-20B54-C 351 90-264 127-370 54 6.5A - 4000VAC - -
LOF450-20B12-C 399.6 90-264 127-370 12 33.3A - 4000VAC - -
LOF450-20B15-C 400.5 90-264 127-370 15 26.7A - 4000VAC - -
LOF450-20B18-C 399.6 90-264 127-370 18 22.2A - 4000VAC - -
-
LOF450-20B19-C 400.9 90-264 127-370 19 21.1A - 4000VAC - -
-
LOF450-20B24-C 450 90-264 127-370 24 18.75A - 4000VAC - -
LOF450-20B27-C 450.9 90-264 127-370 27 16.7A - 4000VAC - -
LOF450-20B36-C 450 90-264 127-370 36 12.5A - 4000VAC - -
LOF450-20B48-C 151.2 90-264 127-370 48 9.4A - 4000VAC - -
LOF450-20B54-C 449.8 90-264 127-370 54 8.33A - 4000VAC - -
-
LOF550-20B12-C 499.2 90-264 127-370 12 41.6A - 4000VAC - -
LOF550-20B15-C 499.5 90-264 127-370 15 33.3A - 4000VAC - -
LOF550-20B18-C 500.4 90-264 127-370 18 27.8A - 4000VAC - -
-
LOF550-20B19-C 499.7 90-264 127-370 19 26.3A - 4000VAC - -
-
LOF550-20B24-C 549.6 90-264 127-370 24 22.9A - 4000VAC - -
LOF550-20B27-C 550.8 90-264 127-370 27 20.4A - 4000VAC - -
LOF550-20B36-C 550.8 90-264 127-370 36 15.3A - 4000VAC - -
LOF550-20B48-C 550 90-264 127-370 48 11.46A - 4000VAC - -
LOF550-20B54-C 550.8 90-264 127-370 54 10.2A - 4000VAC - -
-
URH2405P-6WR3 6 - 24(9-36) 5 - 1 6000VDC DIP 31.60*20.30*10.20
URH2406P-6WR3 6 - 24(9-36) 6 - 1 6000VDC DIP 31.60*20.30*10.20
URH2409P-6WR3 6 - 24(9-36) 9 - 1 6000VDC DIP 31.60*20.30*10.20
URH2412P-6WR3 6 - 24(9-36) 12 - 1 6000VDC DIP 31.60*20.30*10.20
URH2415P-6WR3 6 - 24(9-36) 15 - 1 6000VDC DIP 31.60*20.30*10.20
URH2418P-6WR3 6 - 24(9-36) 18 - 1 6000VDC DIP 31.60*20.30*10.20
-
URH2424P-6WR3 6 - 24(9-36) 24 - 1 6000VDC DIP 31.60*20.30*10.20
URH4805P-6WR3 6 - 48(18-75) 5 - 1 6000VDC DIP 31.60*20.30*10.20
URH4809P-6WR3 6 - 48(18-75) 9 - 1 6000VDC DIP 31.60*20.30*10.20
URH4812P-6WR3 6 - 48(18-75) 12 - 1 6000VDC DIP 31.60*20.30*10.20
URH4815P-6WR3 6 - 48(18-75) 15 - 1 6000VDC DIP 31.60*20.30*10.20
URH4824P-6WR3 6 - 48(18-75) 24 - 1 6000VDC DIP 31.60*20.30*10.20

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