Title:
CIRCUIT FOR COUNTERMEASURING AGAINST HIT OF POWER SUPPLY
Document Type and Number:
Japanese Patent JP3144653
Kind Code:
B2
Abstract:
PURPOSE: To reduce a restoration time after release of hit and to prevent production of impulse noise.
CONSTITUTION: A DC power supply superimposed with an AC signal is supplied from an intra-station equipment to a subscriber's equipment through 2-wire metallic subscriber lines 11,12. A switch section 32 closes or interrupts either of the 2-wire metallic subscriber lines 11, 12 and a capacitor C1 for AC signal separation in a DC AC separation circuit 21. A voltage monitor section 31 closes the switch section 32 when the voltage between the 2-wire metallic subscriber lines 11, 12 is a prescribed voltage or over and interrupts the switch section 32 when less than the prescribed voltage.
Inventors:
Masakazu Oi
Tohru Hayasaka
Tohru Hayasaka
Application Number:
JP15957392A
Publication Date:
March 12, 2001
Filing Date:
June 18, 1992
Export Citation:
Assignee:
富士通株式会社
富士通電装株式会社
富士通電装株式会社
International Classes:
H02J9/06; H02J9/00; H03K17/24; H04M11/00; H04M19/00; H04M19/08; (IPC1-7): H04M19/08; H04M11/00
Attorney, Agent or Firm:
Tadahiko Ito (2 outside)