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News

MEDICAL INNOVATION – POWER SUPPLIES

XP Power : 30 June, 2009  (Special Report)
FOCUS ZONE REPORT XP Power has introduced the world's first 250 W AC/DC power supply that achieves up to 95 percent efficiency and has been specifically designed to reduce the heat generated in medical, IT and industrial systems.
The power efficiency performance of the new CCM250 power supply is claimed to better rival products that typically operate at 90 percent maximum efficiency. The 10 percent of the input energy is converted to waste heat that needs to be removed. The five percent improvement in efficiency offered by the CCM250 means that it dissipates only half the heat, reducing or eliminating the requirement for heatsinks, or fans for forced-air cooling.

The new power supply design removes the need for fans in a system which helps increase reliability while reducing cost, audible noise, system complexity and size. Avoiding audible noise is a key factor in medical applications, where it disturbs patients. Both conducted and radiated emissions are below Class B limits as defined by EN55011, another important consideration in achieving type approval for medical equipment.

The power supply delivers full output with convection cooling over input voltages from 90 to 275 VAC, and 200 W from 80 VAC, in ambient temperatures of -10 to +50 degrees Centigrade. The device measures only 152.4 x 101.6 x 39.1 mm (6 x 4 x 1.54 inches), which XP claims makes it the smallest product in its class and ideal for fitting in 1U enclosures. Where short-term peak power is needed, for example for motor start-up, the power supply will deliver up to 300 W for 500 ms.
The units have a full feature set for controlling the supply and external monitoring and control equipment. This includes a 5 V standby rail, remote on/off switching and power fail signals.

The design of the CCM250 combines conventional and novel design techniques to achieve what is claimed as a step-function in power density and efficiency. The power supply's footprint is minimised through innovative mechanical construction. Heat-generating parts are bonded directly to the U-channel chassis, and magnetic components are conduction-cooled, enabling the use of smaller parts.

Steve Elliott, XP Power's European Sales Director, explained: “The medical market is one market that we have designed this product for. They have a particular requirement for medical devices that are designed to be used in the patient area, next to patient bed for example. In that environment space is at a premium with a lot of other electrical equipment being located in that area. A medical device needs to be as small as possible. In most medical devices the ventilation is quite limited because they want to avoid the ingress of certain substances and contaminants such as fluids, blood and fibres. Because the device is next to the patient, audible noise is also a key factor and this needs to be as low as it possibly can be which means for a power supply that a cooling fan needs to be avoided”.

“We expect this power supply to be used in critical care environments such as ventilators, patient monitoring equipment or point of care testing. Surgical equipment and endoscopes are other applications where this power supply could be used”.

Customer feedback from the medical sector helped XP identify that the power supplies needed to be capable of operating down to 80 Vac. In certain countries the power supplies need to be able to survive brownout conditions as low as 80 V. At the other end of the input voltage scale, the power supplies need to handle spikes up to 275 Vac because in certain medical applications power inputs are supplied from generators if there is a power failure in the hospital. Power surges are common in those situations.
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