How to Choose Medical Switching Power Supply

How to Choose Medical Switching Power Supply

Medical equipment such as ventilators, mask machines, PCR nucleic acid detectors, body temperature detectors, multi-parameter monitors, x-ray, CT/PET, blood analyzers, heart-lung machines, and diagnostic devices employ switching power supplies. X-ray power supplies are used in medicine. Follow these suggestions to choose a medical device power supply with low leakage current, dependable insulation, and high EMC performance.

Medical Uses

Medical devices must safeguard both doctors and patients. Operator and patient safety regulations vary. Since a patient’s health is weaker than an operator’s, the patient needs more protection. The medical device is categorized into three kinds (see below) based on electrical contact and how to touch the patient.

Medical devices that don’t have direct electrical contact with the patient (type B) solely offer operator safety; hence they have reduced power needs. If medical devices touch the patient’s heart (CF type), the body’s most sensitive area, they give the greatest degree of patient protection. Hence they have greater power needs.

Medical Power Supply Tips

First, check whether a medical device’s electrical contractor can touch the patient. Even a modest quantity of leakage current from medical gadgets might harm vulnerable individuals. Second, the medical device’s power supply leakage current must be minimized. Third, medical devices are more vulnerable to EMI than industrial ones. Third, medical power supplies should satisfy stricter EMI requirements. Safety and dependable insulation between the input and output are crucial for medical device power supplies to prevent electric shock. Insulation is provided by the transformer’s isolation voltage, safety distance, and clearance. Choosing a power supply for medical equipment requires consideration of leakage current, EMI, and insulation.

A medical- or industrial-grade power supply will offer adequate operator safety if the medical gadget doesn’t have electrical contact with the patient.

To determine switching power supply needs, follow these steps.

MOP comprises insulation, air clearance, creepage distances, impedances, and safe ground connections. MOPP protects patients and MOOP operators.

BF/CF medical device power supplies must satisfy 2x MOPP, whereas B-type medical equipment may utilize a medical-grade 2x MOOP or industrial power supply.

Analysis Of Venting

A ventilator delivers breaths to a patient who is physically unable to breathe or breathes inadequately by moving breathable air into and out of the lungs. Severe pneumonia patients frequently utilize a ventilator during therapy and life-saving equipment. First aid, anesthesia, ICU, and respiratory treatment utilize often.

The picture below shows how a ventilator regulates airflow via the inspiratory and exhalation valves and measures airflow, pressure, oxygen density, etc., to generate an alert when a patient is breathing abnormally.

Ventilator Power Needs

The ventilator has mains AC/DC, DC/DC, and internal backup batteries. A ventilator’s power supply is crucial to its stability, reliability, and safety. The ventilator’s power needs are below.

The mains ac to dc converter power supply must accept universal input voltage from 85Vac to 264Vac and offer steady 24Vdc output voltage with excellent precision. To prevent disturbing other medical equipment, the power supply’s EMI must conform with EN55011 (CISPR11) CLASS B. Because the ventilator doesn’t have direct electrical contact with the patient, an industrial AC/DC power source is also available.

DC/DC power supply input voltage ranges from 10.8Vdc to 33Vdc, compatible with 12Vdc and 24Vdc systems. The backup batteries within the ventilator offer quick power so it may continue to assist the patient in breathing during a power loss in the hospital.

The ventilator’s control system includes a blower, valve, flow meter, signal sampling, and fan, all requiring a stable power source.

Blower power supply requirements: 24Vdc input, ideal safeguards; for example, if the blower stops operating, the power supply’s output changes into short circuit protection mode. When choosing a power source, its output should equal the ventilator’s blower, between 1A and 3A.

As the front AC/DC or DC/DC power supply is already separated, non-isolated power sources are provided for the inspiratory, exhalation, and oxygen valves.

Flow meters detect a patient breath. Temperature and pressure sensors are part of the signal sampling system. Both need a power source with minimal ripple and noise. Non-isolated DC/DC power supplies are available; however, if the system is disturbed, utilize an isolated power source.

Mornsun provides dependable, safe power solutions with quick lead times for your power supply needs. For more information, feel free to contact us.

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