Power Electronics / Power Management


Power supplies for medical technology

28 April 2010 Power Electronics / Power Management

Phoenix Contact’s single-phase Quint Power SFB power supplies with 24 V and 48 V d.c. output voltage have been certified for the medical sector. With a test certificate in accordance with IEC 60601-1 and EN 60601-1, they may now be used in electrical and electronic medical equipment; for instance, in lighting systems for operating rooms or in hospital beds.

With output currents of 3,5, 5, 10 and 20 A, the units guarantee maximum availability of the connected loads. In order to trigger standard circuit breakers magnetically – and thus within a few milliseconds – power supplies must briefly deliver a current that is multiple times higher than the rated current. The Quint power supply provides this power reserve with its ‘selective fuse breaking’ (SFB) technology. Fault current circuits are selectively shut down with up to six times the rated current for 12 ms; the fault is isolated and critical system components remain in operation.

A static ‘power boost’ power reserve with up to 1,5 times the rated current is permanently available to ensure that loads with high inrush currents start reliably. Comprehensive diagnostics are ensured by constantly monitoring the output voltage and current. This means that critical operating states are visualised and signalled to the control before faults can actually occur.

These power supplies are suitable for worldwide use thanks to their wide-range input, extensive international approvals and a wide temperature range from


-25°C up to +70°C. The high withstand voltage of up to 300 V a.c. ensures additional operational reliability. At just 32 x 90 mm, this slim device saves space on mounting rails.

For more information contact Lou du Plessis, Phoenix Contact, +27 (0)11 801 8200, loudp@phoenixcontact.co.za, www.phoenixcontact.co.za



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