Title:
STEP-DOWN CHOPPER DEVICE
Document Type and Number:
WIPO Patent Application WO/2012/056501
Kind Code:
A1
Abstract:
A switching element (SW) is disposed on a first current path between an input node (Nin1) and an intermediate node (N1). An inductor (L1) is disposed in series with a load element (RD) on a second current path between the intermediate node (N1) and an input node (N2). A reflux element (D1) is disposed on a third current path between the intermediate node (N1) and an input node (Nin2), and returns current to the second and third current paths in periods when the switching element (SW) is off. A control circuit (11) switches the switching element (SW) on and off in such a manner that the instantaneous current value of a switching current (iSW) approaches a target current value (iTG) when the time that elapses from when the switching element turns on equals a first time ratio with respect to the duration from when the switching element turns on to when the switching element turns off.
Inventors:
MURATA KAZUHIRO
SAKIMURA HIROKO
SAKIMURA HIROKO
Application Number:
PCT/JP2010/006411
Publication Date:
May 03, 2012
Filing Date:
October 29, 2010
Export Citation:
Assignee:
PANASONIC CORP (JP)
MURATA KAZUHIRO
SAKIMURA HIROKO
MURATA KAZUHIRO
SAKIMURA HIROKO
International Classes:
H02M3/155
Foreign References:
| JP2009240114A | 2009-10-15 | |||
| JP2008061440A | 2008-03-13 | |||
| JP2008539565A | 2008-11-13 |
Attorney, Agent or Firm:
MAEDA, Hiroshi et al. (JP)
Hiroshi Maeda (JP)
Hiroshi Maeda (JP)
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Claims: