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1. (WO2005064760) APPAREIL POUR LA PROTECTION DE DISPOSITIF DE COMMUNICATION DE LA FOUDRE ET DE SURTENSION
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[CLAIMS]
[Claim l]
An apparatus for protecting cortuπunication equipment from lightning and surges, comprising:
a primary protection unit (11) for protecting circuits from an overvoltage that enters through an inlet side telephone line;
a current limiting unit (12) for limiting the overvoltage having passed through the primary protection unit (11) to a predetermined value;
a high-pass filter unit (13) for separating only high frequency data signals from various signals that enter through telephone lines;
an interface unit (14) connected to the high-pass filter unit (13) to eliminate line noise, adapted to implement a pseudo-ground by realizing equal potentials between the lines and a ground, and adapted to transmit the data signals to an output unit; and
a secondary protection unit (15) for blocking surge voltages transmitted to a modem (16) and a computer (17) by suppressing a residual potential of the primary protection unit 11 behind the interface unit (14) .

[Claim 2]
The apparatus as set forth in claim 1, wherein the high-pass filter unit (13) comprises two condensers (Cu and Ci2) connected in series to tip and ring lines, respectively, and a single coil (L21) connected in parallel between the tip and ring lines .

[Claim 3]
The apparatus as set forth in claim 1, wherein the current limiting unit (12) is constructed by connecting common mode chock coils (LZu and LZX2) in series to tip and ring lines .

[Claim 4]
The apparatus as set forth in claim 1, wherein the interface unit (14) is constructed by connecting coils (L22 and L23) in series between tip and ring lines, the coils (L22 and L23) being composed of two coils or a single coil having a central tap.

[Claim 5]
The apparatus as set forth in claim 4, further comprising a transformer (TI) that is positioned behind the coils (L22 and L23) of the interface unit (14) and realizes electrical insulation with the secondary protection unit (15) .

[Claim 6] The apparatus as set forth in claim 1, further comprising a low-pass filter unit (22) for separating only low frequency voice signals from various signals that enter through telephone lines between the primary protection unit (11) or current limiting unit (12) and a telephone (24) , and a voice protection unit (23) for protecting telephone side equipment.

[Claim 7]
The apparatus as set forth in claim 1, further comprising a power source side surge protection unit (20) in which two surge limiting elements (Mu and Mi2) are connected in series between the computer (17) and a power input terminal of an adaptor (18) , and a connection point between the surge limiting elements (Mu and M12) is connected to a body ground through a negative terminal of the computer (17) or adapter (18) , thus blocking surges that enter through power lines .

[Claim 8]
The apparatus as set forth in claim 1, 6 or 7, wherein a single equipotential loop is constructed by commonly grounding ground terminals of the interface unit (14) , the secondary protection unit (15) , the voice protection unit (23) , the modem (16) and the computer (17) as well as the primary protection unit (11) through a pseudo-ground (21) .