Title:
DERIVATION METHOD FOR EQUIVALENT CIRCUIT MODEL OF POWER SUPPLY SMOOTHING LC FILTER
Document Type and Number:
WIPO Patent Application WO/2014/024692
Kind Code:
A1
Abstract:
With conventional derivation methods for equivalent circuit models of power supply smoothing LC filters, it has been difficult to accurately express characteristics of a power supply smoothing LC filter when operating a power supply circuit. With this equivalent circuit model of a smoothing capacitor (Cout), a capacitance (C1) of a main capacitance element (C1) is multiplied by a rate of change in capacitance k(V) corresponding to a DC output voltage V of a DC/DC converter (1) as indicated in formula (11), and the capacitance (C1) of the main capacitance element (C1) is corrected. In addition, in an equivalent circuit model of a choke coil (L), with regard to a plurality of levels of a DC current I, an impedance ZL of the choke coil (L) is obtained in accordance with formula (3), and an impedance ZL with regard to an arbitrary level is obtained by performing interpolation complementation using formula (8) on the basis of the impedances ZL for the obtained plurality of levels. Accordingly, the equivalent circuit model of the power supply smoothing LC filter is precisely derived in accordance with the DC output voltage V and the DC output current I of the DC/DC converter (1).
Inventors:
TANAKA YUSUKE (JP)
SAKURAGI ATSUSHI (JP)
SAKURAGI ATSUSHI (JP)
Application Number:
PCT/JP2013/070190
Publication Date:
February 13, 2014
Filing Date:
July 25, 2013
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
G06F17/50; G01R27/26; H02M1/14; H02M3/155
Other References:
PRYMAK, JOHN D.: "SPICE Modeling of Capacitors", CARTS, 1995, pages 1 - 5, Retrieved from the Internet [retrieved on 20130930]
HIDEAKI DEGUCHI ET AL.: "Measurement for current dependency of coil inductance using a transient current switching circuit", IEICE TECHNICAL REPORT, vol. 106, no. 361, 10 November 2006 (2006-11-10), pages 13 - 16
GIJUTSU JOHO: "Denryoku Henkan Koritsu ni Eikyo suru Inductor no Factor no Chosa (Koatsu Hen)", TECHNICAL GUIDE, 28 June 2010 (2010-06-28), Retrieved from the Internet [retrieved on 20130930]
HIDEAKI DEGUCHI ET AL.: "Measurement for current dependency of coil inductance using a transient current switching circuit", IEICE TECHNICAL REPORT, vol. 106, no. 361, 10 November 2006 (2006-11-10), pages 13 - 16
GIJUTSU JOHO: "Denryoku Henkan Koritsu ni Eikyo suru Inductor no Factor no Chosa (Koatsu Hen)", TECHNICAL GUIDE, 28 June 2010 (2010-06-28), Retrieved from the Internet
Attorney, Agent or Firm:
MINEGISHI TAKESHI (JP)
Takeshi Minegishi (JP)
Takeshi Minegishi (JP)
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