Datasheet Directories

Power Supplies for Medical Use

Written by Jeff Child

Compliance for Care

Over the past year, there’s been an increasing trend toward new products that have some sort of application or industry focus. That means supplies that include either certifications, special performance specs or tailored packaging intended for a specific application area such as medical.

If you look at the power supply products released over the last 12 months, there’s been a definite uptick in new products that have some sort of application or industry focus. While this hasn’t diminished the role of general-purpose power supplies, the trend has been toward supplies that include either certifications, special performance specs or tailored packaging intended for a specific application—and medical is one such application area.

Medical applications face strict regulatory requirements. Power supplies used in these applications must provide the characteristics to meet the necessary standards for medical use in a hospital or residential home (Figure 1). The worldwide ES/IEC/EN 60601-1 3rd Edition standard provides guidelines. According to RECOM, these are more stringent compared to guidelines for commercial or industrial appliances. Higher safety standards and lower electromagnetic interference (EMI) are required.

To feed the needs of medical equipment developers, power supply vendors are building medical grade DC-DC and AC-DC power supply series that provide reinforced isolation with two means of patient protection (2xMoPP), low leakage (BF and CF ratings) and other medical specific features. Reinforced isolation provides an additional level of safety beyond the standard functional isolation to comply with the medical safety standard ES/IEC/EN 60601-1 3rd Ed. The 3rd edition of IEC 60601 focuses on the safety of operating personnel and patients. To assess medical electrical equipment, a new classification system MOP (means of protection) was introduced.

The product falls into category MOPP when there will be direct physical contact between the device and the patient and then must meet extremely stringent safety standards, especially in regard to insulation. To protect patients against electric shock, such products must feature two separate insulation barriers. The closer the contact between the device and the patient, the lower the permissible leakage current. Application devices are, therefore, classified according to the type of contact with the patient.

Figure 1
Medical applications face strict regulatory requirements. Power supplies used in these applications must provide the characteristics to meet the necessary standards for medical use in a hospital or residential home.

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AC-DC Power Supplies Feature Small Footprint

The VMS-180 series from CUI is a 180 W high density open frame AC-DC power supply certified to the medical 60601-1 edition 3.1 safety standards for 2xMoPP applications and 4th edition EMC requirements. Packaged in a low profile, industry standard 2" x 4" footprint with high efficiency up to 92%, these medical power supplies are well suited for space-constrained medical and dental applications where reliability and regulatory compliance are major concerns.

• Up to 180 W continuous power

• -40°C to +70°C temperature range

• Input voltage: 80 V to 264 V

• Efficiency up to 94%

• Industry standard 2" x 4" footprint

• 12 V auxiliary fan output

• Medical 60601-1 4th edition safety approvals

• Designed for 2xMoPP applications

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1 W Converters in Encapsulated SIP-7/SMD Packages

MINMAX Technology’s MINMAX MAU01M/MSCU01M series is a new range of high performance 1 W medical safety approved DC-DC converters with encapsulated SIP-7 and SMD packages. They are specifically designed for medical applications. The series includes models available for input voltages of 4.5 VDC to 5.5 VDC, 10.8 VDC to 13.2 VDC, and 21.6 to 26.4 VDC. The I/O isolation is specified for 4,000 VAC with reinforced insulation and rated for a 300 VRMS working voltage.

• Industrial standard SIP-7 package
• I/O isolation 4,000 VAC with reinforced insulation
• Low leakage current less than 2 µA
• Operating ambient temp. range -40°C to 95°C
• Short circuit protection
• Medical EMC Standard with 4th Edition of EMI EN 55011 and EMS EN 60601-1-2 Approved
• 2xM0PP per 3rd Edition of IEC/EN 60601-1 & ANSI/AAMI ES60601-1 approved with CE marking

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Regulated 1 W Converters Feature Low-Profile SMT Package

The NXF1 series of DC-DC converters from Murata Power Solutions is used where a tightly regulated supply is required. They are ideal for situations where the input voltage is not tightly controlled. The single rail regulated output makes the ideal choice to power sensors, such as pressure transducers, Hall effect sensors and mass airflow sensors.

• UL60950 recognition pending
• Output regulation less than 1%
• Single isolated output
• 3 kVDC isolation “Hi-Pot Test”
• 3.3 V and 5 V input
• 3.3 V and 5 V output
• SMD construction
• Patent protected
• Short circuit protection

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DC-DC Converters Meet Critical Medical Certifications

RECOM’s REM15-W, REM20-W and REM30-W series are medical-grade DC/DC modules in a power range from 15  W to 30 W. They can be easily integrated into medical designs due to their compact case size and full medical certifications. They feature reinforced isolation of 5 kVAC, low leakage current, while offering extra wide 4:1 input voltage ranges.

• 60601-1 3rd Edition Certification
• 5 kVAC reinforced isolation rated at 250 VAC
• Case sizes: 1.6" x 1" and 2” x 1"
• Extra-wide 4:1 input voltage range
• Efficiency of up to 90%
• -40°C to 105°C operating temperature
• Single output options: 5 V to 24 V
• Dual outputs either 5 V, 12 V or 15 V

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600 W Programmable Power Supplies Certified to Medical Standards

TDK-Lambda’s GXE600 AC-DC programmable power supplies are a convection cooled 600 W-rated series is certified to the medical IEC 60601-1 and industrial IEC 60950-1 and IEC 62368-1 standards. The GXE600 is suitable for medical, industrial, test and measurement applications requiring wide-range output voltage and current programming, with sensitivity to noise from cooling fans. The GXE600 is available with a nominal 24 V or 48 V output and can be programmed, using the RS-485 interface (Modbus RTU protocol) or an external 0 to 6 V analog signal, for constant voltage and constant current (CVCC) operation.

• Convection cooled
• Up to 95% efficient
• Modbus RTU (RS-485) communication
• Constant voltage and constant current modes
• Monitoring and programming functions
• Digital or analog programming
• Seven year warranty

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Tiny 150 W AC-DC Supply Meets Med Approvals

The EPL150 series from XP Power is a range of high density, low profile, open-frame AC-DC power supplies aimed at space-critical, cost-sensitive, industrial, ITE and healthcare applications. The series features comprehensive safety agency approvals including IEC60950-1-1 for ITE, IEC62368-1 for ITE and IEC/ES60601-1 for medical. Medical approvals are for 2xMoPP from input to output and 1xMoPP from both input to earth and output to earth, suitable for BF applied-part applications.

• 100 W convection/150 W forced-cooled ratings
• 2" x 4" footprint
• Low 0.99" profile
• Class I and Class II operation
• 12 V fan output
• High efficiency, up to 94%
• ITE and Medical (BF) approvals
• High power density
• Less than 0.5 W no load input power

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Editor-in-Chief at Circuit Cellar | Website | + posts

Jeff Child has more than 28 years of experience in the technology magazine business—including editing and writing technical content, and engaging in all aspects of magazine leadership and production. He joined the Circuit Cellar after serving as Editor-in-Chief of COTS Journal for over 10 years. Over his career Jeff held senior editorial positions at several of leading electronic engineering publications, including EE Times and Electronic Design and RTC Magazine. Before entering the world of technology journalism, Jeff worked as a design engineer in the data acquisition market.

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Power Supplies for Medical Use

by Jeff Child time to read: 2 min