Industrial Electronics

Toroidal Transformer Minimizes Leakage Current in Medical-Grade Power Source

10 February 2016

Incorporating low leakage toroidal transformer, magnetic components supplier Triad Magnetics has readied a new series of rugged, portable medical-grade power sources called the MD Series. The medical-grade units come with power cord and receptacles, and provide a simple and reliable way of safely isolating medical devices, diagnostic instruments, patient monitoring equipment and other electrical stimulus therapeutic equipment from the power line. To minimize cost and enhance reliability, according to the manufacturer, the toroidal transformer design does not include additional unnecessary filtering. Unlike others, to effectively limit chassis and ground leakage current, the MD Series keeps the output neutral floating.

Portable power sources offer 3 kV medical-grade isolation.Portable power sources offer 3 kV medical-grade isolation.

Besides minimizing leakage currents from the power line through to the patient and equipment, the construction of the MD Series toroidal transformer also minimizes radiated magnetic fields that can adversely affect very sensitive patient diagnostic, monitoring and therapy instruments. In addition, the medical-grade isolation power units are certified to UL 60601-1 2nd edition and CAN/CSA-C22.2 No. 601.1 international safety standards. In essence, the MD Series offers users, such as hospital and medical center personnel, the capability of providing medical-grade power to several different instruments within the space of a patient’s room.

The MD Series is available in models with output voltage of 120 VAC in ratings from 250 VA to 2400 VA, with two or four NEMA 5-15 receptacles (based on VA rating). Units are available with 240 VAC or 120 VAC input. All units feature 3 kV galvanic isolation, 5 percent no-load to full-load regulation, and 92 percent typical efficiency at full load and less than 10 μA typical leakage. In quantities of 10, a 250 VA model costs $136.87 and 2400 VA unit is priced at $457.69.

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