Title:
VOLTAGE CONVERTER
Document Type and Number:
WIPO Patent Application WO/2019/188029
Kind Code:
A1
Abstract:
Provided is a voltage converter capable of improving a power conversion efficiency not only during a low load but also during a high load. A step-down type DC/DC converter 1 is provided with an inductor L1 with a tap and a capacitor C1. The inductor L1 and the capacitor C1 constitute an LC filter. The inductor L1 and a switching element SW3 constitute a variable inductor, the inductance value of which can be changed, and the capacitor C1 and a variable DC voltage source Vc constitute a variable capacitor, the capacitance value of which can be changed. A control unit 2 changes the inductance value of the variable inductor in accordance with the input/output voltage ratio Vin/Vout between a DC input voltage Vin and a DC output voltage Vout. When changing the inductance value of the variable inductor, the control unit 2 changes the capacitance value of the variable capacitor to a capacitance value with which an LC resonant frequency f0 is maintained constant.
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| JPS5944968 | CHOPPER TYPE POWER SOURCE CIRCUIT |
Inventors:
ONOZAKI NORIMICHI (JP)
Application Number:
PCT/JP2019/008526
Publication Date:
October 03, 2019
Filing Date:
March 05, 2019
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H02M3/155
Foreign References:
| JP2015192470A | 2015-11-02 | |||
| JP2007195335A | 2007-08-02 | |||
| JP2015061497A | 2015-03-30 | |||
| JP2005168157A | 2005-06-23 |
Attorney, Agent or Firm:
MINEGISHI Takeshi (JP)
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