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.

公开(公告)号：US20250088107A1

公开(公告)日：2025-03-13

申请号：US18702022

申请日：2022-10-04

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Koki MINE ,  Koji YOSHIDA ,  Takeshi NAKAYASHIKI

IPC: H02M3/158 ,  B60R16/033

Abstract: A power conversion device includes: a DC/DC converter including a conversion circuit; and a control circuit that detects a first voltage at an output terminal, a first current flowing through the conversion circuit, and a second voltage at an input terminal, obtains information indicating a target output voltage and a predetermined voltage, and performs calculations to emit a PWM signal for operating the conversion circuit. The control circuit performs: a first calculation for calculating a target current for approximating the first voltage to the target output voltage; a second calculation for calculating a first duty ratio for approximating the first current to the target current; a third calculation for calculating a second duty ratio based on the predetermined voltage and the second voltage; and a fourth calculation for calculating a driving duty ratio of the PWM signal using the first and the second duty ratios to control the first voltage.