SWITCHING POWER SUPPLY CIRCUIT

WIPO Patent Application WO/2006/115223

A1

A switching power supply circuit according to a first invention wherein a smoothing circuit includes an electromagnetic induction circuit the inductance of which is variable, a control circuit controls the electromagnetic induction circuit so that the inductance of the electromagnetic induction circuit may be a predetermined value when the amount of variation of the current is below a predetermined value and may be below the predetermined value when the amount of variation is a predetermined value or more, whereby the ripple voltage is low and the transient response to a variation of the load current is quick. A switching power supply circuit according to a second invention wherein when the variation of the current is a predetermined value or more because of a load variation and when the current increases or decreases, charge is supplied from a capacitive element to the load or absorbed by the capacitive element from the load by applying a positive or negative voltage to the capacitive element to suppress the vibratory voltage whereby a lower ripple voltage is realized and the transient response to a variation of the load current is quick.

KONO MASASHI (JP)
ZHANG TING (JP)
LIU AIYAN (JP)
KIMURA KEIGO (JP)
KOBAYASHI HARUO (JP)
KOBORI YASUNORI (JP)

PCT/JP2006/308467

November 02, 2006

April 21, 2006

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UNIV GUNMA NAT UNIV CORP (JP)
KONO MASASHI (JP)
ZHANG TING (JP)
LIU AIYAN (JP)
KIMURA KEIGO (JP)
KOBAYASHI HARUO (JP)
KOBORI YASUNORI (JP)

H02M3/155

JPH04200274A	1992-07-21
JPH0833392A	1996-02-02
JP2000245147A	2000-09-08

Nakajima, Jun (NAKAJIMA & KATO Seventh Floor, HK-Shinjuku Bldg., 3-17, Shinjuku 4-chom, Shinjuku-ku Tokyo 22, JP)

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