Title:
PFCコンバータ
Document Type and Number:
Japanese Patent JP5170096
Kind Code:
B2
Abstract:
A diode bridge (B1) that performs full-wave rectification on an AC input power supply (Vac) is provided. A switching element (Q1) that performs switching on an output voltage thereof, an inductor (L1) that passes a current interrupted by the switching element (Q1) and that accumulates and emits excitation energy, a diode (D1), and a smoothing capacitor (C1) constitute a step-up chopper circuit. A digital signal processing circuit (13) detects a phase of an input voltage (Vi), and a switching frequency of the switching element (Q1) is modulated in accordance with the phase. Accordingly, the switching frequency can be appropriately modulated without depending on an input voltage, so that a wide range of input voltages can be accepted while suppressing EMI noise with a peak generated in the switching frequency and higher-order frequency components thereof.
Inventors:
Yoshiyuki Uno
Tokugawa Tokuni
Tatsuya Hosoya
Tokugawa Tokuni
Tatsuya Hosoya
Application Number:
JP2009522537A
Publication Date:
March 27, 2013
Filing Date:
April 04, 2008
Export Citation:
Assignee:
MURATA MANUFACTURING CO.,LTD.
International Classes:
H02M7/12; H02M3/155
Domestic Patent References:
| JP2004282958A | 2004-10-07 | |||
| JP2001145358A | 2001-05-25 | |||
| JP2000069752A | 2000-03-03 | |||
| JP2001161069A | 2001-06-12 | |||
| JP2007046972A | 2007-02-22 |
Attorney, Agent or Firm:
Kaede International Patent Office