Abstract
In this study, we propose a method to remove bio-signal distortions generated when the power is at transient condition in a high-powered portable medical device. To verify the method, three units were designed that consists of a main control unit, bio-signal measurement unit, and power unit. Also, each units were separated with galvanic isolation. For stable operation at the surge condition, the power unit was composed using push-pull converter topology. The design has been examined in both transient and steady state of the operating conditions. The experiment result shows that galvanic isolation between each units was efficient in high-powered potable medical device.
Highlights
As medical emergency situations gain interest, the existing electronic medical devices used by connecting power-lines are gradually becoming portable [1, 2]
Because of a lot of current from the battery is instantly delivered to the main circuit, bio-signal distortion occurs due to the noise generated from the operation of power converter and drop of battery voltage in a moment
The clearance is set to 3.5 mm according to the ‘Means of Patient Protection (MOPP)’ in the IEC60601-3rd edition presented by the international medical device standards [11]
Summary
As medical emergency situations gain interest, the existing electronic medical devices used by connecting power-lines are gradually becoming portable [1, 2]. Since around 150~360 Joule of energy is needed for heart resuscitation, AED converts the low voltage of its inner battery to a high voltage up to about 1,500 ~ 2,000 volts for capacitor At this point, to increase the success rate of defibrillation, the voltage of the capacitor has to reach its target voltage in a short time. For voltage conversion and fast charging, most of the AEDs are made consuming a lot of current for initial stage of charge At this time, because of a lot of current from the battery is instantly delivered to the main circuit, bio-signal distortion occurs due to the noise generated from the operation of power converter and drop of battery voltage in a moment. Each of circuit units such as the main control, power, and bio-signal measurement unit was designed and separated by galvanic isolation to eliminate distortion of bio-signal at the transient condition of power source
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