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3W 3kV DC-DC converter for medical and industrial

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By Nick Flaherty


 

Cosel has launched a 3W DC-DC converter range with high isolation and ruggedised pins for medical and industrial applications.

Packaged in a Single In Line (SIP) type 8, the MH3 series has a reinforce isolation of 3kVAC, 4.2KVDC, complies with medical isolation standard (2MOOP (250VAC)) and ruggedized for industrial applications that might implies differential In/OUT voltage.

Three input voltages (4.5V-18V ; 9V – 36V and 18V -76V) and a large variety of single (MHFS3) and dual output (MHFW3) cover a large range of applications. Designed for performances, the MH3 has only 20pF max insulation capacitance reducing noise transfer.

The MH3 DC-Dc converter series has a reinforced insulation that supports 3kVAC and 4.2kVAC isolation test in accordance to safety standards and its transformer designed to sustain differential voltage that might happen in industrial applications. With long expertize in designing power supplies for equipment using IGBT drivers, Cosel designers applied high-power high-isolation best practice to the low power 3W MH3 series to reduce isolation fatigue resulting from differential high voltage happening in motor control or IGBT driver.

The Application Manual provides life expectancy curves helping system’s architects developing Gate Controllers for industrial equipment to apply proper design rules and cautions.

For medical applications, the MH3 series complies with the 2xMOOP (250VAC) (Means Of Operator Protection) isolation requirement, as specified in the IEC60601-1 3rd edition standard.

To reduce inventory but as well making their equipment easy to install and maintain, system designers require a DC-DC converter that is able to accept a large range of input voltages. This drives the three wide-input range voltages, with 4.5V to 18V covering 12V battery applications, 9V to 36V combining 12V and 24V battery systems and 18V to 76V addressing 24V and 48V systems. The DC-DC converter series is also available in five single output 3.3V, 5V, 9V, 12V, 15V (MHFS3) and two dual outputs +/-12V and +/-15V (MHFW3). Output can be used in series, delivering 24V or 30V. Single output voltage MHFS3 can be adjusted by using the Vout Trim pin on the secondary side.

The MH3 series has built-in overcurrent protection circuit, with automatic recovery. A remote control pin operating as negative logic (L:ON, H:OFF) is available on standard. Devices can be operated within a temperature range of -40 to +85C ambient, 20 – 95%RH (Non condensing). Depending on cooling, a power derating may apply to not exceed +105C at specified measuring point.

To reduce transfer noise, the isolation capacitance is reduced to the lowest possible level, reaching a maximum of 20 pF, which is a great benefit when powering motor control systems.

To reduce user’s board space, the MH3 series is housed in a SIP8 packaging measuring 22.0 x 12.0 x 9.5mm [0.87 x 0.48 x 0.38 in] (WXHXD) and has a weight of 7 grams maximum. Industrial and in some case medical equipment can be subject to vibrations engendering possible damages on the pins of SIP products. The pins are molded in an epoxy holder, strengthening the connections between the application PCB and the module, making the unit even more reliable when used in demanding applications. The DC-DC converter series has been qualified on vibrations testing: 10 – 55Hz 98.0m/s2 (10G), 3minute period, 60minutes each along X, Y and Z axis and shock: 490.3m/s2 (50G) 11ms, once each along X, Y and Z axis.

Addressing both, medical and industrial applications, the series conforms to UL62368-1, EN62368-1, c-UL (equivalent to CAN/CSA-C22.2 No.62368-1), ANSI/AAMI ES60601-1, EN60601-1 3rd, c-UL (equivalent to CAN/CSA-C22.2 No.60601-1).

The power supply complies with the RoHS directive and is CE marked in accordance with the Low Voltage Directive.

www.coseleurope.eu/Products/DC-DC/MHFSwww.coseleurope.eu/Products/DC-DC/MHFW

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