High Power Density AC-DC Power Module For Medical Applications

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  • Optimised for conduction cooling, COSEL’s AC-DC power module series is capable of supporting high power requirements
  • The module series also includes overcurrent, overvoltage and thermal protection

COSEL has extended its TUNS series by adding the 1.2 kW, compact and low profile, onboard AC-DC power module, the TUNS1200 that has an input voltage range of 85VAC to 305VAC. With a design optimised for conduction cooling, the TUNS1200 is suitable for applications requiring a silent power solution such as in a surgery room. Equally, it is suitable for industrial applications when forced air ventilation is impossible due to environmental constraints.

In applications where more power is required and physical height is an issue, TUNS1200 modules can be connected in parallel up to nine units (up to 9,750W), their output voltage can be adjusted down to zero volts and easily set to constant voltage or constant current operating modes. When connected in parallel and utilising the Current Balance (CB) pin, the active current sharing ensures that each module delivers the correct amount of current to the load.

Wide operation range

Optimised for conduction cooling, the units can be operated from -40 degrees Celsius to +100 degrees Celsius baseplate temperatures, with full power operation up to +85 degrees Celsius, 20 – 95%RH (Non condensing). Depending on cooling and assembly method, a power derating may apply.

TUNS1200 power supplies have an input voltage range of 85VAC to 305VAC single phase and conform to the safety standards input voltage range of 100-277 VAC (50/60Hz). For applications such as battery chargers requiring constant current (CC), the TUNS1200 includes a dedicated pin (ITRM) and by applying a DC voltage or connecting a resistor to the –S terminal it is possible to set the constant current from just above zero to the desired current.

High power features

Housed in a sealed plastic case with aluminium baseplate, the TUNS1200 measures 117.3 x 86.8 x 12.7 mm (4.62 x 3.42 x 0.5 inches) and weighs less than 280 grams. Compared to conventional 1kW onboard AC-DC modules, the TUNS1200’s footprint is 36 per cent smaller while delivering 21 per cent more power.

The TUNS1200 series includes a 50W ¼ brick, 100W ½ brick and 300, 500 and 700W full brick units. The TUNS1200 series has three output voltages versions: TUNS1200F12 (12V / 84A), TUNS1200F28 (28V / 43A) and the TUNS1200F48 (48V / 25A). The output voltage can be adjusted +/- 20% (-20% /+10% for the 48V) using the trimming pin, though the TUNS1200 series include an active Voltage Trimming input (VTRM) making it possible to adjust the output voltage down to zero by applying an external voltage source. The TUNS1200 has a power efficiency of 92 per cent typical and a power factor of 0.98 at 100V.

The units have a 3,000VAC input to output isolation voltage (2MOOP), 2,000VAC input to ground (1MOOP) and 500VAC output to ground. Overcurrent, overvoltage and thermal protection are included as standard.

The TUNS1200 complies with several safety agency approvals and complies with the RoHS directive and is CE marked as per Low Voltage Directive.


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