Medical Electronics

Pyreos gives priority to shipping for medical breath monitoring systems


yreos has announced that during the Covid-19 pandemic it is prioritising delivery of its infrared pyroelectric detectors to manufacturers of critical medical systems, particularly capnography systems and anaesthetic gas monitors. Typically used with ventilators, Capnometers continuously measure CO2 concentration in breath and the high speed of Pyreos infrared sensors makes them particularly suitable. CO2 monitoring permits clinicians to check whether

ventilators have been correctly set up (intubated) and also supports diagnosis of lung and heart function and other conditions. World Health Organisation (WHO) guidelines state that capnography is part of the recommended minimum equipment for anaesthesia and for ventilator use. In the UK, capnography is mandatory for patients anaesthetised in theatre and its broader use is growing in the UK.

Pyreos supplied its dual channel analogue infrared detectors for

capnography to leading European and Asian medical equipment manufacturers for several years and is in development with a major global customer. The company is also working with other established capnography manufacturers to support accelerated development programmes launched during the pandemic. As a result of the pandemic, it has ramped the production of its ezPyro, anaesthesia and CO2 detection products to support OEMs manufacturing of these vital systems worldwide. The company is

also supporting research and development projects in two universities on ventilation and breath measurement by offering advice, reference designs and design help. This support includes open-sourcing of relevant reference designs.

Pyreos holds stock of many products and may be able to satisfy some short- term requirements. Customers can contact Pyreos, their local distributor or go to for short term needs or updated lead time information.

3W high isolation DC/DC converters for medical and industrial applications


OSEL has launched a new series of high isolation 3W DC/ DC converters for medical and industrial applications. Packaged in a Single In Line (SIP) type 8, the

COSEL 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 COSEL MH3 is a unique design from COSEL, manufactured in Japan and covers by a 5 years warranty.

Designed with high reliability in mind, the COSEL MH3 series has a reinforced insulation, sustains 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. COSEL conducted tests and verifications and provides, in the Application Manual, 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’s designers require DC/DC converter able to accept

a large range of input voltages. The COSEL MH3 series is available in three wide-input range voltage: 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 MH3 series is 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. The MH3 series 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, COSEL designers reduced the isolation capacity to lowest possible level, reaching a maximum of 20 pF, which is a great benefit when powering motor control systems. Industrial and in some case medical

equipment can be subject to vibrations engendering possible damages on the pins of SIP products. COSEL MH3 series 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 MH3 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 MH3 series received the agency approvals: 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). To reduce user’s board space, the MH3 series is housed in a SIP8 packaging measuring 22.0X12.0X9.5mm [0.87X0.48X0.38 inches] (WXHXD) and with a weight of 7 grams maximum. The power supply complies with the RoHS directive and is CE marked in accordance with the Low Voltage Directive.

Components in Electronics October 2020 17

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