Patents Assigned to EMC Inc.
  • Noise filter and electronic apparatus having the same
    Patent number: 7015774
    Abstract: A noise filter of the present invention includes an inductor and a resistor connected in parallel with each other. A power supply frequency current does not pass the resistor but passes through the inductor with no loss. On the other hand, a high frequency noise current including a resonance frequency current, does not pass the inductor but is dissipated at the resistor. Therefore, the noise filter does not charge noise power and so does not suffer from a problem due to power discharging. The resonance frequency current caused by the noise filter and the earth capacitance is also dissipated at the resistor. Therefore, no problem is caused by the resonance frequency current.
    Type: Grant
    Filed: December 10, 2003
    Date of Patent: March 21, 2006
    Assignee: EMC Inc.
    Inventors: Takashige Terakawa, Hideyuki Yamanaka
  • Noise filter and electronic apparatus having the same
    Publication number: 20040263284
    Abstract: A noise filter of the present invention includes an inductor and a resistor connected in parallel with each other. A power supply frequency current does not pass the resistor but passes through the inductor with no loss. On the other hand, a high frequency noise current including a resonance frequency current, does not pass the inductor but is dissipated at the resistor. Therefore, the noise filter does not charge noise power and so does not suffer from a problem due to power discharging. The resonance frequency current caused by the noise filter and the earth capacitance is also dissipated at the resistor. Therefore, no problem is caused by the resonance frequency current.
    Type: Application
    Filed: December 10, 2003
    Publication date: December 30, 2004
    Applicant: EMC Inc.
    Inventors: Takashige Terakawa, Hideyuki Yamanaka
  • Noise filter
    Patent number: 6801103
    Abstract: A noise filter 10 of the present invention includes an inductor 71 and a resistor 11 connected in parallel with each other. A power supply frequency current bypasses the resistor 11 but passes through the inductor 71. A high frequency noise current including a resonance frequency current, on the other hand, bypasses the inductor 71 but is dissipated at the resistor 11. Therefore, the noise filter 10 does not accumulate noise power and so does not suffer from a problem due to power releasing. The resonance frequency current caused by combination of inductance of the inductance and earth capacitance in the noise filter 10 is also dissipated at the resistor 11, thus giving rise to no problem of its own.
    Type: Grant
    Filed: July 18, 2002
    Date of Patent: October 5, 2004
    Assignee: EMC Inc.
    Inventors: Takashige Terakawa, Hideyuki Yamanaka
  • Noise filter
    Publication number: 20030117814
    Abstract: A noise filter 10 of the present invention includes an inductor 71 and a resistor 11 connected in parallel with each other. A power supply frequency current bypasses the resistor 11 but passes through the inductor 71. A high frequency noise current including a resonance frequency current, on the other hand, bypasses the inductor 71 but is dissipated at the resistor 11. Therefore, the noise filter 10 does not accumulate noise power and so does not suffer from a problem due to power releasing. The resonance frequency current caused by combination of inductance of the inductance and earth capacitance in the noise filter 10 is also dissipated at the resistor 11, thus giving rise to no problem of its own.
    Type: Application
    Filed: July 18, 2002
    Publication date: June 26, 2003
    Applicant: EMC Inc.
    Inventors: Takashige Terakawa, Hideyuki Yamanaka