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Multiparameter patient monitors: Achieve isolation and safety with power and data architecturesPithadia

NOV
09
2020
09. NOV 2020

Lecture electronica Conferences > electronica Medical Electronics Conference > Session 2: SAFETY, SECURITY & REGULATORY

17:30-18:00 h | Virtual

Isolation and safety are critical parameters for any medical end equipments. Multiparameter patient monitors measure vital signs and use isolated modules for achieving the patient safety. These modules are small in size as they are inserted into the main monitor and support up to 5kV isolation. The data and power both are isolated using digital isolators and isolated power supplies respectively. This paper illustrates the design and testing of different power and data architectures to help achieve isolation and safety. It explains the isolation requirements and safety limits from medical standards and showcases how isolation is achieved in existing products. Further, this paper dwells deeper into critical design challenges associated with isolated power and data such as output voltage regulation, feedback mechanism, input voltage range, output power, emissions and size considerations. It not only talks about discrete topologies (like conventional and primary-side regulated flyback supporting wide-input and adjustable output power, open-loop and closed-loop push-pull highlighting feedback mechanism and output regulation) but also explains integrated isolated power and data modules for form-factor constraint designs. The component selection and calculations include detailed analysis for each of these topologies. Finally, it compares isolated architectures on the basis of output power levels, percentage output regulation, isolation levels, transformer design complexity, number of components, size (with the help of custom transformer and layout design), and system-level integration.

Subjects: Medical Electronics

Speaker: Sanjay Pithadia (Texas Instruments)

Type: Lecture

Speech: English

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Isolation and safety are critical parameters for any medical end equipments. Multiparameter patient monitors measure vital signs and use isolated modules for achieving the patient safety. These modules are small in size as they are inserted into the main monitor and support up to 5kV isolation. The data and power both are isolated using digital isolators and isolated power supplies respectively. This paper illustrates the design and testing of different power and data architectures to help achieve isolation and safety. It explains the isolation requirements and safety limits from medical standards and showcases how isolation is achieved in existing products. Further, this paper dwells deeper into critical design challenges associated with isolated power and data such as output voltage regulation, feedback mechanism, input voltage range, output power, emissions and size considerations. It not only talks about discrete topologies (like conventional and primary-side regulated flyback supporting wide-input and adjustable output power, open-loop and closed-loop push-pull highlighting feedback mechanism and output regulation) but also explains integrated isolated power and data modules for form-factor constraint designs. The component selection and calculations include detailed analysis for each of these topologies. Finally, it compares isolated architectures on the basis of output power levels, percentage output regulation, isolation levels, transformer design complexity, number of components, size (with the help of custom transformer and layout design), and system-level integration.

Sanjay Pithadia

Sanjay Pithadia

Texas Instruments

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Sanjay Pithadia
Sanjay Pithadia

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