Communication line isolator
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United States of America Patent
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Oct 6, 2015
Grant Date -
Oct 31, 2013
app pub date -
Apr 11, 2013
filing date -
Apr 26, 2012
priority date (Note) -
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Abstract
An isolator 10 is formed with an isolation transformer 13 that blocks an abnormal voltage entering from a communication line 30 and protects a protection target device 40. A pulse transformer 43 in the device 40 includes a primary winding 43a connected to a secondary winding 13b of the transformer 13 and a secondary winding 43b connected to an inner circuit. A medium tap of the primary winding 43a is grounded through an inner capacitance Ci of the device 40. A parasitic capacitance Cs between the primary winding 13a and the secondary winding 13b of the transformer 13 and the inner capacitance Ci are connected in series, an abnormal voltage is divided by the capacitance Cs and the capacitance Ci, and a capacitance value of the capacitance Cs is set such that the divided voltage of the capacitance Ci is equal to or below a predetermined value.
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