公开(公告)号：US20160216332A1

公开(公告)日：2016-07-28

申请号：US14991139

申请日：2016-01-08

Applicant: ROLLS-ROYCE plc

Inventor： Chandana Jayampathi GAJANAYAKE ,  Shantha Dharmasiri Gamini JAYASINGHE ,  Sivakumar NADARAJAN ,  Amit Kumar GUPTA

IPC: G01R31/327 ,  G01R31/40

CPC classification number: G01R31/42

Abstract: A method of open-switch fault detection in a two-level voltage source power converter comprises the steps of: i. acquiring the waveforms of three-phase alternating current of the two-level voltage source power converter; ii. calculating at least a first time derivative of each acquired waveform; and iii. using the at least first time derivatives to determine whether an open-switch fault is present in the two-level voltage source power converter.

Abstract translation: 一种二电平电压源功率转换器中开路故障检测的方法，包括以下步骤： 获取二电平电压源功率转换器的三相交流电波形; ii。 计算每个获取的波形的至少第一时间导数; 和iii。 使用至少第一次导数来确定两级电压源功率转换器中是否存在开路开关故障。

公开(公告)号：US20160154065A1

公开(公告)日：2016-06-02

申请号：US14926853

申请日：2015-10-29

Applicant: ROLLS-ROYCE PLC

Inventor： Sivakumar NADARAJAN ,  Shantha Dharmasiri Gamini JAYASINGHE ,  Amit Kumar GUPTA ,  Chandana Jayampathi GAJANAYAKE ,  Viswanathan VAIYAPURI

IPC: G01R31/40

CPC classification number: G01R31/40 ,  G01R29/16 ,  G01R31/343

Abstract: A method of assessing a condition of a multi-phase power system comprises the steps of: acquiring a voltage signal and a current signal for each phase of the multi-phase power system; calculating a product of the voltage signal for each phase of the multi-phase power system with one of the current signals such that the product is between a voltage signal for one phase and a current signal for a different phase for at least two of the products; summing the calculated products; and identifying the possible existence of a fault in the multi-phase power system based on a frequency analysis of the summed calculated products.

Abstract translation: 一种评估多相电力系统状况的方法，包括以下步骤：获取多相电力系统各相的电压信号和电流信号; 使用所述电流信号之一来计算所述多相电力系统的各相的电压信号的乘积，使得所述乘积位于所述一相的电压信号与所述产品中的至少两个产品的不同相的电流信号之间 ; 计算产品的总和; 并基于对所计算出的产品的频率分析，确定多相电力系统中可能存在的故障。

公开(公告)号：US20170350934A1

公开(公告)日：2017-12-07

申请号：US15596878

申请日：2017-05-16

Applicant: ROLLS-ROYCE plc

Inventor： Mohamed Halick Mohamed SATHIK ,  Chandana Jayamapathi GAJANAYAKE ,  Shantha Dharmasiri Gamini JAYASINGHE ,  Amit Kumar GUPTA ,  Rejeki SIMANJORANG

IPC: G01R31/26 ,  H02M3/158 ,  H02M7/217 ,  H02M7/537

CPC classification number: G01R31/2617 ,  G01R31/2621 ,  G01R31/2637 ,  G01R31/327 ,  G01R31/40 ,  H02M3/158 ,  H02M7/217 ,  H02M7/537

Abstract: A method of monitoring the health of a semiconductor power electronic switch such as an insulated gate bipolar transistor (IGBT) is provided. The method having the steps of: measuring one or more parameters selected from the group consisting of: a rate of change of voltage ( dV dt ) across the switch; a rate of change of current ( di dt ) through the switch, a charge present on a gate of the switch (QG), a peak overshoot voltage (VPO) across the switch, and a peak overshoot or reverse recovery current (IRR) through the switch; and estimating the health of the switch based on the measured parameter(s).

公开(公告)号：US20160315558A1

公开(公告)日：2016-10-27

申请号：US15092372

申请日：2016-04-06

Applicant: ROLLS-ROYCE plc

Inventor： Meng Yeong LEE ,  Chandana Jayamapathi GAJANAYAKE ,  Shantha Dharmasiri Gamini JAYASINGHE ,  Sivakumar NADARAJAN ,  Amit Kumar GUPTA

IPC: H02M7/537

CPC classification number: H02M7/537 ,  H02M1/32 ,  H02M7/5387 ,  H02M7/5395 ,  H02M2001/327

Abstract: A method of controlling an inverter, in which the inverter includes a single-phase inverter arrangement comprising a complementary pair of power switches, comprises the steps of:controlling the complementary pair of power switches with a modulating signal to output an AC signal;judging which of the power switches in the complementary pair of power switches is at a higher temperature;determining the magnitude and sign of a DC offset signal to apply to the modulating signal to reduce the total current in the power switch judged to be at the higher temperature; andapplying the DC offset signal to the modulating signal.

Abstract translation: 将DC偏移信号应用于调制信号。