Gallery View: Reliability compliance key for compact medical-use power supplies

Manufacturers of power supplies for medical products ensure output meets safety requirements.

Portable medical devices are surging in popularity, driving companies in China's power supply sector targeting this market to boost the release of small units with high reliability and safety features. These are projected to reach $80 billion by the end of 2020, nearly double the earlier estimate as global demand skyrockets amid the COVID-19 pandemic, according to a report by Global Industry Analysts.

Widely available power supplies in China are open-frame and desktop types for hospital-use equipment, and wall-mount variants for home devices. These come in a range of specifications such as 1 to 1,000W rated power and 3.3 to 48V rated voltage. Isolation voltage is usually more than 4,000V. These products meet international standards CE, cUL, DOE Level V or VI and UL. They also conform to safety guidelines specific to medical electrical equipment, including UL 60601-1, EN 60601-1, IEC 60601, EN 55022, GB 9706.1, MOPP and 2xMOPP.

Customization is a common practice. Power supplies based on buyers' specifications take up between 20 and 60 percent of total shipment from manufacturers interviewed for this report.

Key production inputs include chips, passive components, PCBs, cases, wires and connectors. Chips come mostly from US and other foreign suppliers, and the rest of the components from domestic sources. The cost of manufacturing inputs did not fluctuate in the past 12 months, keeping product prices flat. Some companies lowered their quotes to cope with intense competition. This generally stable trend is expected to persist in 2021.

5 to 36VDC output voltage

This power supply for medical products from Ninghai Yingjiao Electrical Co. Ltd, the YS6M-4298, has 100 to 240VAC, 50/60Hz input rating, and 5 to 36VDC output and 3kV withstand voltages. The unit, with overload, -voltage and short-circuit protection, meets CB, CE, DOE Level VI, FCC and RoHS requirements.

The 500-unit minimum order is for delivery within 20 days.

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30W-rated

Rated at 30W, the YSV25-4938 power supply from Ninghai Yingjiao Electrical Co. Ltd has 100 to 240VAC, 50/60Hz input rating and 5 to 36VDC output voltage. For medical products, it comes with a US, EU, UK or AU plug. This model meets CB, CCC, CE, cUL, EMC, EN 60601, GS, PSE, SAA, TÜV and UL standards.

An order of at least 1,000 units is required for delivery within 15 days.

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70% efficiency

Designed for medical products, the model FJ-SW328 power supply from Shenzhen Fujia Appliance Co. Ltd has 100 to 240VAC, 50/60Hz, maximum 0.4A rated input, 0.1mA leakage current and 70 percent efficiency. The unit complies with IEC 60601, EN 60601, UL 60601 and GB 4943 standards.

The minimum order is 3,000 units. Delivery is within 20 days.

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78 to 90% efficiency

Shenzhen Fujia Appliance Co. Ltd's FJ-SW3006 power supply for medical products has 100 to 240VAC, 50/60Hz, maximum 1.5A input and 5 to 48V, 0.1 to 6A output. Input frequency range is 47 to 63Hz. The unit, with 0.3W maximum standby power, has 78 to 90 percent efficiency. It complies with EN 60601 requirements.

The supplier requires a minimum order of 500 units. Delivery takes 20 days.

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12V, 2A output

From Shenzhen Shengji Mains Co. Ltd, the SJ-12020001 power supply for medical products has 100 to 240VAC, 250mA input and 12V, 2A output. Input frequency range is 47 to 63Hz and leakage current is less than 0.25mA. This model meets CB, CE, cUL, EK, EN 55022, 55024, 55013, 55020, 60065, 60950 and 60601, FCC, GS, PSE and UL standards.

An order of at least 1,000 units has a 15-day delivery lead time.

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24W output power

The SJ-1220-E model power supply offered by Shenzhen Shengji Mains Co. Ltd is designed for medical products, with 100 to 240VAC, 50/60Hz input and 12VDC, 2A output. The 24W unit, with 80 percent efficiency, has built-in overvoltage, -current, and short- and open-circuit protection. Operating temperature is -10 to 50 C.

The minimum order of 1,000 units has a delivery lead time of 15 days.

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