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Patent Searching and Data

Document Type and Number:
WIPO Patent Application WO/2015/068998
Kind Code:
The present invention relates to a protection circuit for a power device which protects a power device from a surge by effectively discharging an SMPS power unit when a surge voltage or a surge current is applied through an AC power input terminal. The present invention comprises: a surge protection portion comprising first and second surge protectors, which are respectively connected in parallel between a live terminal, a neutral terminal, and a frame ground (FG) from among AC power input terminals, for forming first and second bypasses when the voltage level of AC power is at least a predetermined first operating voltage while clamping an output voltage with a second operating voltage, and a third surge protector, which is connected in parallel between the live terminal and the neutral terminal, for forming a third bypass when the voltage level of AC power is at least the predetermined first operating voltage; and an EMI filter portion, which is connected to the rear end of the surge protection portion, is provided with X-caps at the front end and at the rear end of a common mode choke (CMC), and which is provided with a Y-cap between the live terminal and the frame ground and between the neutral terminal and the frame ground.

PARK, Jin Pyo (101-205, 30 Seonyuseo-ro 21-gil,,Yeongdeungpo-gu, Seoul 150-043, 150-043, KR)
NA, Won San (55-206, 36 Gaepo-ro 110-gil,Gangnam-gu, Seoul 135-946, 135-946, KR)
YOO, Soo Yeub (1 16, Sinchon 4-ro Dongnam-gu,Cheonan-si, Chungcheongnam-do 330-770, 330-770, KR)
LEE, Bae Geun (1 22, Haryul-ro 30beon-gil Jangan-gu,Suwon-si, Gyeonggi-do 440-725, 440-725, KR)
Application Number:
Publication Date:
May 14, 2015
Filing Date:
November 04, 2014
Export Citation:
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AMOSENSE CO., LTD. (19-1 Block, Cheonan 4th Regional Industrial Areas 90, 4sandan 5-gil, Jiksan-eup, Seobuk-gu,Cheonan-si, Chungcheongnam-do 331-814, 331-814, KR)
International Classes:
H02M1/32; H02H9/02; H02M1/12
Foreign References:
Attorney, Agent or Firm:
LEE, Jae Hwa (4th floor, 7 Teheran-ro 28-gil,Gangnam-gu, Seoul 135-920, 135-920, KR)
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