公开(公告)号：US20150311822A1

公开(公告)日：2015-10-29

申请号：US14680272

申请日：2015-04-07

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Yue MA ,  Hitoshi TSUJI ,  Koichi UEKI

IPC: H02M7/5387

CPC classification number: H02M7/53871 ,  H02M7/483 ,  H02M7/487 ,  H02M2001/007

Abstract: A three-level inverter circuit includes first to fourth front-stage switches connected in series, and a floating capacitor connected between a connection point of the first and second front-stage switches and a connection point of the third and fourth front-stage switch elements, and outputs an intermediate voltage of a DC power supply through a connection point of the second and third front-stage switches. A bridge circuit includes first, second, third, and fourth rear-stage switches which are bridge-connected to first to fourth terminals. The first terminal thereof is connected to a connection point of the second front-stage switch and the third front-stage switch and a second terminal thereof is connected to the second input terminal.

Abstract translation: 三级逆变器电路包括串联连接的第一至第四前级开关和连接在第一和第二前级开关的连接点与第三和第四前级开关元件的连接点之间的浮动电容器 通过第二和第三前级开关的连接点输出直流电源的中间电压。 桥接电路包括桥接到第一至第四端子的第一，第二，第三和第四后级开关。 其第一端子连接到第二前级开关和第三前级开关的连接点，并且其第二端子连接到第二输入端子。

公开(公告)号：US20140369090A1

公开(公告)日：2014-12-18

申请号：US14474620

申请日：2014-09-02

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Koichi UEKI ,  Junichi ITOH ,  Yoshiya OHNUMA

IPC: H02M7/5387 ,  H02M3/335 ,  H02M1/15

CPC classification number: H02M7/53871 ,  H02M1/15 ,  H02M3/1588 ,  H02M3/33507 ,  H02M7/5387 ,  H02M2001/007 ,  H02M2001/0093 ,  Y02B70/1466

Abstract: In an inverter apparatus, an output voltage of an active filter circuit that steps up and smoothes a DC voltage is converted into an AC voltage by an inverter circuit. The active filter circuit includes a capacitor and a rectifier device connected between an input node and an output node. An inductor, one end of which is connected to the input node and the other end of which is connected the output node through the rectifier device, and a switch device connected between the other end and a low-potential-side line, and a first control circuit for the switch device are provided. The inductor stores energy while the switch device is on and releases the energy while the switch device is off. The rectifier device conducts such that the stored energy of the inductor is released.

Abstract translation: 在逆变器装置中，通过逆变器电路将升压平滑直流电压的有源滤波电路的输出电压转换为交流电压。 有源滤波器电路包括连接在输入节点和输出节点之间的电容器和整流器件。 一个电感器，其一端连接到输入节点，另一端通过整流装置连接输出节点，连接在另一端和低电位侧线之间的开关装置，第一 提供了用于开关装置的控制电路。 当开关器件接通时，电感器存储能量，并在开关器件关闭时释放能量。 整流器件导通，释放电感器的存储能量。

公开(公告)号：US20180262101A1

公开(公告)日：2018-09-13

申请号：US15973561

申请日：2018-05-08

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Yuki ISHIKURA ,  Koichi UEKI

IPC: H02M1/38 ,  H02M3/335 ,  H02M1/08

Abstract: A power conversion device includes a power conversion circuit that performs switching control of first and second semiconductor switches connected in series and converts an input direct current voltage into an alternating current voltage. A switching adjustment circuit includes a first capacitance addition circuit that increases an output capacitance of the first semiconductor switch. The first capacitance addition circuit includes a first capacitive element and a first switching unit connected in series and is connected in parallel to the first semiconductor switch. A first driving control circuit drives and controls the first capacitance addition circuit. The first driving control circuit turns on the first switching unit when the first semiconductor switch is turned off, increasing the output capacitance of the first semiconductor switch, and turns off the first switching unit when a predetermined time period elapses after the first semiconductor switch is turned off.