公开(公告)号：US20180063891A1

公开(公告)日：2018-03-01

申请号：US15669125

申请日：2017-08-04

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Makoto IMAI ,  Atsushi FUJITA ,  Takayuki HIROKAWA

IPC: H05B6/04 ,  H02M5/458

CPC classification number: H05B6/04 ,  H02M1/4225 ,  H02M5/458 ,  H02M5/4585 ,  H02M7/53803 ,  H02M7/5387 ,  H02M2007/4815 ,  H02M2007/4818 ,  H05B6/062 ,  Y02B70/126 ,  Y02B70/1441 ,  Y02B70/145

Abstract: A resonant circuit in an inverter includes a first resonant circuit configured with a heating coil and a first resonant capacitor connected in series to the heating coil, a second resonant circuit configured with the first resonant circuit and a second resonant capacitor connected in parallel to the first resonant circuit, and a resonance choke coil connected in series to the second resonant circuit. The resonant circuit is configured so that impedance of the heating coil and the first resonant capacitor is set to be close to impedance of the second resonant capacitor, at a frequency of a current flowing through the heating coil. Thus, an object to be heated can be efficiently induction-heated without an increase in a current flowing through the switching element.

公开(公告)号：US20250030345A1

公开(公告)日：2025-01-23

申请号：US18713089

申请日：2022-09-27

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Ryusuke KANOMATA ,  Shinji UJITA ,  Kenichiro TANAKA ,  Takeshi NAKAYASHIKI ,  Takayuki HIROKAWA

IPC: H02M3/158 ,  H02M1/00 ,  H02M7/44

Abstract: The power conversion device can undergo autonomous search control for ZVS without a larger circuit area or lower reliability. The power conversion device performs, in each switching cycle, an operation of turning the control switch (CTLSW) on and afterward off while the synchronous rectification switch (SRSW) is off, and then turning the synchronous rectification switch on and afterward off while the control switch is off. Whether the inductor current (iL) is positive or negative is detected at the detection timing backed by a predetermined period (Text) from a timing at which the synchronous rectification switch switches from on to off, based on the detection result, the on-period (TOFF) of the synchronous rectification switch is corrected.