• Journal of Power Electronics
• /
• 제16권1호
• /
• pp.57-65
• /
• 2016

Reverse matrix converters, which can step up voltages, are suitable for applications with source voltages that are lower than load voltages, such as generator systems. Reverse matrix converter topologies are advantageous because they do not require additional components to conventional matrix converters. In this paper, a detection method and a post-fault modulation strategy to operate a converter as close as possible to its desired normal operation under the open-switch fault condition in the rectifier stage are proposed. An open-switch fault in the rectifier stage of a reverse matrix converter causes current distortions and voltage ripples in the system. Therefore, fault-tolerant control for open-switch faults is required to improve the reliability of a system. The proposed strategy determines the appropriate switching stages from among the remaining healthy switches of the converter. This is done based on reference currents or voltages. The performance of the proposed strategy is experimentally verified.

• Journal of Power Electronics
• /
• 제9권6호
• /
• pp.949-959
• /
• 2009

This paper presents a systematic investigation of the fault-mode behaviors of matrix converter systems. Knowledge about converter behaviors after fault occurrence is important from the standpoint of reliable system design, protection and fault-tolerant control. Converter behaviors have been, in detail, examined with both qualitative and quantitative approaches for key fault types, such as switch open-circuited faults and switch short-circuited faults. Investigating the fault-mode behaviors of matrix converters reveals that converter operation with switch short-circuited faults leads to overvoltage stresses as well as overcurrent stresses on other healthy switching components. On the other hand, switch open-circuited faults only result in overvoltage to other switching components. This study can be used to predict fault-mode converter behaviors and determine additional stresses on remaining power circuit components under fault-mode operations.

• JSTS:Journal of Semiconductor Technology and Science
• /
• 제14권6호
• /
• pp.760-767
• /
• 2014

This paper describes a high-radix crossbar switch design with low latency and power dissipation for Network-on-Chip (NoC) applications. The reduction in latency and power is achieved by employing a folded-clos topology, implementing the switch organized as three stages of low-radix switches connected in cascade. In addition, to facilitate the uniform placement of wires among the sub-switch stages, this paper proposes a Mux-Matrix-Mux structure, which implements the first and third switch stages as multiplexer-based crossbars and the second stage as a matrix-type crossbar. The proposed 256-radix, 8-bit crossbar switch designed in a 65nm CMOS has the simulated power dissipation of 1.92-W and worst-case propagation delay of 0.991-ns while operating at 1.2-V supply and 500-MHz frequency. Compared with the state-of-the-art designs in literature, the proposed crossbar switch achieves the best energy-delay-area efficiency of $0.73-fJ/cycle{\cdot}ns{\cdot}{\lambda}^2$.

• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2002년도 전력전자학술대회 논문집
• /
• pp.519-524
• /
• 2002

This paper presents a soft-switching technique of single-stage power conversion Matrix Converter of AC-AC converters. Conventional hard-switching method is limited to operate at low switching frequency due to increased switching loss. In this paper, by additional auxiliary switch circuits, it is shown that the main switch of the matrix converter operate as a zero-voltage switches, and the auxiliary switch operate as a zero current switch. Finally, the soft-switching technique with auxiliary switches is compared with conventional hard-switching technique, and Is analyzed by simulation.

• 한국통신학회논문지
• /
• 제31권2A호
• /
• pp.201-206
• /
• 2006

다중 빔 위성중계기 부품중의 하나인 MSM(Microwave Switch Matrix)에 필요한 SPST 스위치 MMIC를 설계 및 제작하였다. 설계된 스위치 MMIC는 3GHz 대역에서 동작하며, 새로운 구조를 채택하여 기존의 FET 스위치보다 전력 특성과 격리도를 개선하였으며, 스위치의 On/Off 상태에서의 입출력 반사손실 특성이 우수하다. MMIC는 0.15um GaAs pHEMT 공정으로 제작되었으며, 3$\∼$4GHz 대역에서 2.0dB 이하의 삽입손실과, 63dB 이상의 격리도 성능을 가지는 것으로 측정되었다. 또한 사용된 단위 pHEMT 소자가 0.2mm Gate Width 임에도 불구하고 320dBm 이상의 OIP3 특성을 가지고 있는 것으로 측정되었으며, 이 결과는 기존의 발표된 FET 스위치에 비해 높은 전력 특성이다.

• ETRI Journal
• /
• 제19권4호
• /
• pp.326-343
• /
• 1997

In this paper, we propose an ATM switch with the rate more than gigabits per second to cope with future broadband service environments. The basic idea is to separate the connection control flow from the data information flow inside the switch. The proposed switch has a dual-plane switch matrix with the synchronous control algorithm. The queuing behaviors of the proposed switch are shown by the discrete-time queuing analysis. Numerical analyses are taken both in the non-blocking crossbar switch and the banyan switch with internal blocking. Results show that a proposed dual-plane $16{\times}16$ switch would have the acceptable performance with maximum throughput of about 95 percent.

• Journal of the Korean Data and Information Science Society
• /
• 제26권6호
• /
• pp.1593-1600
• /
• 2015

A control chart is very useful in monitoring various production process. There are many situations in which the simultaneous control of two or more related quality variables is necessary. We construct bivariate Shewhart control charts based on the trace of the product of the estimated variance-covariance matrix and the inverse of the in-control matrix and investigate the properties of bivariate Shewart control charts with VSI procedure for monitoring covariance matrix in term of ATS (Average time to signal) and ANSW (Average number of switch) and probability of switch, ASI (Average sampling interval). Numerical results show that ATS is smaller than ARL. From examining the properties of switching in changing covariances and variances in ${\Sigma}$, ANSW values show that it does not switch frequently and does not matter to use VSI procedure.

• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2019년도 전력전자학술대회
• /
• pp.74-76
• /
• 2019

This paper proposes an open-switch fault tolerant strategy based on the model predictive control for a full bidirectional switches indirect matrix converter (FBS-IMC). Compared to the conventional Indirect Matrix Converter (IMC), the FBS-IMC can provide healthy current path when open-switch fault is occurred. To keep the continuous operation, the fault tolerant strategy is developed by means of reversing the DC-link voltage polarity regardless of the faulty switch location in the rectifier or inverter stage. Therefore, the proposed control strategy can maintain the same input and output performances during the faulty condition as the normal condition. The simulation results are given to verify the effectiveness of the proposed strategy.

• 한국정보디스플레이학회:학술대회논문집
• /
• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
• /
• pp.854-857
• /
• 2009

The concept of a microplasma current switch for a device operated in a current mode like organic light-emitting diodes, which features matrix addressability and current switching, is presented as well as its architecture and operational principle. To verify the concept, we have fabricated a 100 mm ${\times}$ 100 mm microplasma current switch panel with a cell pitch of $1080{\mu}m{\times}1080{\mu}m$. Moreover, the current-voltage measurements of the unit cell are performed for three different driving voltage amplitudes. They show the characteristic of an asymmetric floating double probe diagnosing plasmas.

• 한국전자통신학회논문지
• /
• 제12권1호
• /
• pp.101-108
• /
• 2017

양자게이트 행렬은 치수가 r, 제어상태벡터 수가 n 및 표적상태벡터 수가 1인 경우에 $r^{n+1}{\times}r^{n+1}$ 차원 행렬이므로 n 증가에 따른 행렬 크기는 지수 함수적 증가 특성을 갖는다. 만약 제어상태벡터의 경우 수가 $2^n$이라면 $2^n-1$ 경우는 입력이 출력에 보전되는 단위행렬의 항등연산이고, 오직 한 개의 제어상태벡터 연산만이 표적상태벡터에 대한 유니터리 연산이다. 본 논문은 행렬차원 증가에 결정적 기여를 하는 $2^n-1$개의 단위행렬 연산을 한 동작의 산술멱승 연산으로 대체할 수 있는 새로운 함수 임베딩 방법을 제안한다. 제안한 함수 임베딩 방법은 다치 임계값을 갖는 2진 리터럴 스위치를 사용하므로 범용 하이브리드 MCU 게이트를 $r{\times}r$ 유니터리 행렬로 실현할 수 있다.