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Power Adapters in Medical Machine
Chargers can be brought on the plane, but the charging treasure on the rules, 1, charging treasure less than 20,000 mA can be carried over the security check on the plane. 2, more than 20,000 mA less than 32,000 mA must be approved by the airlines to bring on the plane. 3, the charging treasure...
Description
What is the Arcing Characteristics of Power Adapters
This article will provide a more in-depth discussion of arc characteristics in power adapter gases. While this is not always necessary, it can be informative to an engineer designing a power adapter ballast for certain decisions to be made at some point. Concentrated research into the conductive properties of gases began in the 19th century. This led to a deeper understanding of the properties and nature of electrons, as well as the initial understanding of atomic structure and the use of X-rays in medical diagnostics.
Paxing studied the DC breakdown voltage as a function of gas pressure between a pair of electrodes in air in 1889. He used spherical electrodes with a diameter much larger than the distance between the two electrodes, which avoided high voltage gradients near the tip or edge. The conclusion he reached, the famous Paxing curve, is shown in Fig. 16. 6. When the two electrodes are separated by 0. 3 to 0. 5 cm, the breakdown voltage at one atmosphere is close to 1000 V. As the air pressure decreases, the breakdown voltage will continue to fall to a minimum of about 300 V, after which it rises rapidly. Other gases exhibit the same behavior, except that the critical air pressure at the point of lowest breakdown voltage varies.
Paxing's law provides an experimental explanation for the phenomenon mentioned above, namely collisional ionization. At high air pressure, the mean distance between atoms (i.e., the mean free range) is small. Thus, when an electron or positive ion is accelerated by an electric field to a sufficiently large velocity to ionize a neutral atom before it collides with other atoms. As the gas pressure decreases, the mean free range will increase, and the electron or positive ion will then be accelerated through a longer distance before colliding, thus accumulating enough velocity. At the final collision, they then have enough energy to ionize the atom, which creates an avalanche effect of carriers, which initiates the arc.
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