公开(公告)号：US20170110986A1

公开(公告)日：2017-04-20

申请号：US15116022

申请日：2015-02-04

Applicant: DENSO CORPORATION

Inventor： Takashi IMURA

IPC: H02M7/5387 ,  H02P6/14 ,  H02P27/08 ,  H02M1/14

CPC classification number: H02M7/5387 ,  H02M1/12 ,  H02M1/14 ,  H02M1/15 ,  H02M2001/008 ,  H02P6/14 ,  H02P23/04 ,  H02P27/08 ,  Y02B70/1441

Abstract: In a power conversion system, when a frequency of a ripple current, flowing into a power supply line of a direct current power source, is equal to a resonance frequency of an LC filter, a resonance is efficiently restricted. In the LC filter connected between the direct current power source and an inverter circuit, an N channel MOSFET is arranged between a capacitor and ground. When a BPF detects an occurrence of the resonance in the LC filter, an inverting amplifier operates the N channel MOSFET and changes a series resistance value of a current path on which the capacitor is arranged.

公开(公告)号：US20190379299A1

公开(公告)日：2019-12-12

申请号：US16430924

申请日：2019-06-04

Applicant: DENSO CORPORATION

Inventor： Takashi IMURA

IPC: H02M7/5387 ,  G01R19/165 ,  H02H7/12 ,  H02H7/122 ,  G11C16/30

Abstract: A power conversion circuit is provided. The power conversion circuit includes a bridge circuit connected between power input terminals, a drive circuit supplied with power from a DC power source via the power input terminals, a boost circuit for, when the DC power source is reversely connected, starting up and supplying power to a control circuit, and a reverse voltage detection circuit for detecting a reverse voltage generated when the DC power source is reversely connected.

公开(公告)号：US20190199264A1

公开(公告)日：2019-06-27

申请号：US16221823

申请日：2018-12-17

Applicant: DENSO CORPORATION

Inventor： Takashi IMURA ,  Junya OISHI

IPC: H02P27/06 ,  H02M1/14 ,  H02P6/28 ,  H02K7/00

CPC classification number: H02P27/06 ,  H02K7/006 ,  H02M1/14 ,  H02M2001/0038 ,  H02P6/28

Abstract: A motor drive device includes a storage unit that stores an initial value of a static capacitance correlation value of a static capacitance of a smoothing capacitor in an initial state, when the smoothing capacitor is connected to an inverter. A measurement unit of the motor drive device includes a timing generation circuit and a calculation unit. The measurement unit measures the static capacitance correlation value of the smoothing capacitor as a measured value at a time after the initial state. A determination unit of the motor drive device determines whether there is deterioration in the smoothing capacitor based on a relationship between the measured value and the initial value. A restrictor of the motor drive device restricts a maximum rotation number of a motor when capacitor deterioration is determined, thereby reducing a ripple current, limiting heat generation in the capacitor, and extending the product life of the capacitor, without increasing the number of parts in the motor drive device.

公开(公告)号：US20190190409A1

公开(公告)日：2019-06-20

申请号：US16193093

申请日：2018-11-16

Applicant: DENSO CORPORATION

Inventor： Takashi IMURA

IPC: H02P6/10 ,  H02M3/158 ,  H02M7/5387 ,  H02M1/14

CPC classification number: H02P6/10 ,  H02M1/14 ,  H02M3/1582 ,  H02M7/5387 ,  H02M2001/0009 ,  H02P2201/07

Abstract: A motor driver drives a motor by receiving a power supply from a direct current power source, and includes a half-bridge circuit, a smoothing capacitor, a power supply circuit, a current adjuster circuit, and a control circuit. The half-bridge circuit and the smoothing capacitor are connected at positions between a power supply line and a ground line. The current adjuster circuit adjusts a current supply amount to the power supply circuit. The control circuit controls the half-bridge circuit and the current adjuster circuit. The control circuit controls the current adjuster circuit based on an operating state of the half-bridge circuit.

公开(公告)号：US20130134952A1

公开(公告)日：2013-05-30

申请号：US13684720

申请日：2012-11-26

Applicant: DENSO CORPORATION

Inventor： Takashi IMURA

IPC: G05F1/575

CPC classification number: G05F1/575

Abstract: In a power supply circuit, an error amplifier controls a main transistor based on a detection voltage according to an output voltage and a reference voltage corresponding to a target voltage of the output voltage such that the output voltage coincides with the target value. A phase compensation circuit for the power supply circuit includes a level shift circuit and a phase compensation capacitor. The level shift circuit generates a shift voltage by shifting a dc component of the output voltage toward a ground potential by a predetermined voltage, and outputs the shift voltage from an output terminal of the level shift circuit. The phase compensation capacitor is disposed on a route between the output terminal of the level shift circuit and an input terminal of an amplifier circuit of the error amplifier.

Abstract translation: 在电源电路中，误差放大器根据与输出电压的目标电压对应的输出电压和基准电压的检测电压来控制主晶体管，使得输出电压与目标值一致。 用于电源电路的相位补偿电路包括电平移位电路和相位补偿电容器。 电平移位电路通过将输出电压的直流分量向接地电位移动预定电压来产生移位电压，并从电平移位电路的输出端输出移位电压。 相位补偿电容器设置在电平移位电路的输出端子和误差放大器的放大器电路的输入端子之间的路径上。

公开(公告)号：US20180316279A1

公开(公告)日：2018-11-01

申请号：US15951724

申请日：2018-04-12

Applicant: DENSO CORPORATION

Inventor： Takashi IMURA

IPC: H02M7/5375 ,  H02M1/36 ,  H02M7/5387 ,  H03K17/14

CPC classification number: H02M7/5375 ,  H02M1/36 ,  H02M7/53871 ,  H02M2001/0038 ,  H03K17/145

Abstract: A power device includes a semiconductor relay and a pre-charger that has a reference voltage generator and a controller. The semiconductor relay is disposed at a position between a battery supplying electric power to a power converter that serves as a load and a smoothing capacitor connected on a battery side of the power converter in parallel with the power converter. The reference voltage generator generates a reference voltage having a gradually-increasing voltage value in a pre-charge period, prior to a turning ON of the semiconductor relay accompanying a turning ON of an ignition switch. The controller controls the semiconductor relay such that a charge voltage which is an inter-terminal voltage of the smoothing capacitor is set to a preset value according to the reference voltage.

公开(公告)号：US20180034384A1

公开(公告)日：2018-02-01

申请号：US15658851

申请日：2017-07-25

Applicant: DENSO CORPORATION

Inventor： Takashi IMURA

IPC: H02M7/5395 ,  H02M1/08

CPC classification number: H02M7/5395 ,  H02M1/08 ,  H02M7/5387 ,  H02P27/08 ,  H03K17/0822 ,  H03K2217/0054

Abstract: An inverter main circuit using high-side MOSFETS converts a power source voltage of a battery to an alternating current, and supplies the alternating current to a three-phase motor. A control circuit drives, via a high-side drive circuit and a low-side drive circuit, the MOSFETS. A charge pump circuit boosts the power source voltage to a charge pump voltage. A bootstrap circuit outputs a bootstrap voltage that is boosted by diodes and capacitors, which is then passed to a clamp circuit for clamping and outputting as a clamp voltage. Based on the supply of the charge pump voltage or the clamp voltage in response to a fluctuation of the power source voltage, a continuous circuit operation is provided while protecting the circuit in operation.

公开(公告)号：US20160091917A1

公开(公告)日：2016-03-31

申请号：US14891743

申请日：2014-06-17

Applicant: DENSO CORPORATION

Inventor： Takashi IMURA

IPC: G05F3/26

CPC classification number: G05F3/262 ,  G05F3/18 ,  G05F3/24

Abstract: A constant current-constant voltage circuit includes a first resistor; a first transistor that is an N-channel type; a second transistor; a third transistor that is a P-channel type; a fourth transistor that is a P-channel type; a fifth transistor; a second resistor; and a first constant voltage element. The second resistor is coupled between the intermediate node and a source of the third transistor and the first constant voltage element is coupled between a source of the second transistor and the second power source line. A bias is set up and a source potential of the first transistor is equal to a source potential of the fifth transistor.

Abstract translation: 恒定电流恒压电路包括第一电阻器; 第一晶体管是N沟道型; 第二晶体管; 第三晶体管是P沟道型; 第四晶体管是P沟道型; 第五晶体管; 第二电阻器; 和第一恒压元件。 第二电阻器耦合在中间节点和第三晶体管的源极之间，第一恒压元件耦合在第二晶体管的源极和第二电源线之间。 建立偏置，并且第一晶体管的源极电位等于第五晶体管的源极电位。