Power Electronics / Power Management


AC/DC power module for medical and industrial applications

25 November 2020 Power Electronics / Power Management

Cosel has added a 1,2 kW, compact and low-profile onboard AC/DC power module to its stable. Designed for demanding worldwide applications, the TUNS1200 has an input voltage range of 85 V a.c. to 305 V a.c. and is certified to meet industrial and medical standards.

Packaged in a sealed plastic case with aluminium baseplate, the TUNS1200 has a height of just 12,7 mm and weighs less than 280 grams. Compared to existing 1 kW onboard AC/DC modules, the TUNS1200’s footprint is 36% smaller while delivering 21% more power. The unit can be operated from -40°C to +100°C baseplate temperatures. TUNS1200 modules can be paralleled up to nine units (up to 9750 W), their output voltage can be adjusted down to zero volts, and they are easily set to constant voltage or constant current operating modes.

The TUNS1200 series embraces three output voltages versions: TUNS1200F12 (12 V / 84 A), TUNS1200F28 (28 V / 43 A) and the TUNS1200F48 (48 V / 25 A). Output voltage can be adjusted by +/-20% (-20% /+10% for the 48 V model) using the trimming pin, although 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. Using the latest technology, the TUNS1200 has a power efficiency of 92% typical and a power factor of 0,98 at 100 V.

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.

In applications where more power is required and physical height is an issue, it is possible to connect up to nine TUNS1200s in parallel, delivering up to 9750 W in conduction cooling mode. When connecting units in parallel and utilising the Current Balance (CB) pin, the Cosel active current sharing ensures that each module delivers the correct amount of current to the load.

Optimised for conduction cooling, the TUNS1200 series can be operated within a temperature range of -40°C to +100°C baseplate, 20-95% RH (non condensing). Depending on cooling and the assembly method, a power derating may apply.

Housed in a sealed plastic case with aluminium baseplate, the TUNS1200 measures 117,3 x 86,8 x 12,7 mm. The unit includes four mounting holes for fixing the unit to a cold plate or an additional heatsink. The standard unit comes with M3 threaded mounting holes, and a 3,4 millimetre non-threaded mounting insert option is available (option T).

The units have a 3000 V a.c. input to output isolation voltage (2MOOP), 2000 V a.c. input to ground (1MOOP) and 500 V a.c. output to ground. Overcurrent, overvoltage and thermal protection are included as standard.

Benefiting from 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 where forced air ventilation is impossible due to environmental constraints. Attached to a chassis or cold plate, the TUNS1200 can deliver impressive power with a high level of reliability.


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