POWER SUPPLY DEVICE

WIPO Patent Application WO/2015/156139

A1

A power supply device comprises: an inverter circuit (11) for converting a DC voltage to an AC voltage; a pulse signal generation circuit (12) for controlling the inverter circuit (11) at a set drive frequency; an insulating type piezoelectric transformer (15) for stepping down the AC voltage output from the inverter circuit (11); a parallel resonant circuit (14) connected between the inverter circuit (11) and the piezoelectric transformer (15); and another parallel resonant circuit (152) constituted by the piezoelectric transformer (15) and an inductor (L2) connected to the output side of the piezoelectric transformer (15) and having the same resonance frequency as the parallel resonant circuit (14). A process is performed at a predetermined period, in which the resonance frequency of the piezoelectric transformer (15) attributable to the parallel resonant circuits (14, 152) is detected at the input side of the piezoelectric transformer (15) by sweeping the drive frequency. The detected resonance frequency is set as the drive frequency.

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JP2006280094	PIEZOELECTRIC TRANSFORMER DRIVE CIRCUIT AND MANUFACTURING METHOD OF PIEZOELECTRIC TRANSFORMER DRIVE CIRCUIT
JP2013150422	PIEZOELECTRIC TRANSFORMER DRIVE DEVICE

TAKAHASHI HIRONOBU (JP)
ICHIKAWA KEIICHI (JP)

PCT/JP2015/059303

October 15, 2015

March 26, 2015

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MURATA MANUFACTURING CO (JP)

H02M3/24

WO2008056436A1

2008-05-15

JP2013132140A	2013-07-04
JP2011125145A	2011-06-23
JP2004048853A	2004-02-12

Kaede Patent Attorneys' Office (JP)
Patent business corporation Kaede Patent Attorneys' Office (JP)

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