Time filter

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El Segundo, CA, United States

International Rectifier is an American power management technology company that manufactures analog and mixed-signal ICs, advanced circuit devices, integrated power systems, and integrated components that enable high-performance in computing. IR's products are used in motherboards, appliances, lighting, automobiles, satellites, aircraft, and defense systems. On 13 January 2015 the company became a part of Infineon Technologies. Wikipedia.

Huang R.,International Rectifier | Mazumder S.K.,University of Illinois at Chicago
IEEE Transactions on Power Electronics | Year: 2010

This paper outlines a switching scheme to improve the energy efficiency for an isolated high-frequency multiphase dc/pulsating-dc converter, which is the front end of a three-phase rectifier-type high-frequency-link inverter. Without using any auxiliary circuit, the proposed switching scheme achieves zero-current or zero-voltage switching for the power switches on the front-end multiphase dc/pulsating-dc converter. Moreover, on the back-end pulsating-dc/ac converter, the proposed soft-switching scheme reduces the switching frequency requirements for the associated switchers, which need high-frequency switching. In conjunction with the back-end pulsating-dc/ac converter, operating with a patent-filed hybrid modulation scheme, the proposed switching scheme leads to reduced overall switching loss as compared with other existing schemes. It is more suitable for isolated low-voltage dc to three-phase high-voltage ac applications from the standpoints of cost, efficiency, and footprint. © 2011 IEEE.

Tjokrorahardjo A.,International Rectifier
Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC | Year: 2010

Compact Fluorescent Lamp (CFL) and Light Emitting Diode (LED) are energy efficient light sources. However, they have a disadvantage that they cannot be directly dimmed with a triac dimmer. This article briefly explains the incompatibility issues, and suggests a CFL ballast circuit to overcome this disadvantage. The ballast is based on resonant mode topology, with additional circuitry for triac interface and dimming control. Furthermore, this article also presents, with few modifications to the CFL ballast circuit, an LED driver circuit that is dimmable with triac dimmer. Experimental results show that both proposed circuits are able to be dimmed down close to 10% of the light output. ©2010 IEEE.

Rahimi A.M.,International Rectifier | Williamson G.A.,Illinois Institute of Technology | Emadi A.,Illinois Institute of Technology
IEEE Transactions on Vehicular Technology | Year: 2010

Tightly regulated closed-loop converters are problematic when used as a load since they tend to draw constant power and exhibit negative incremental resistance. This negative resistance causes stability problems for the feeder system, whether it is an input filter or another converter. In multiconverter power electronic systems, which exist in different land, sea, air, and space vehicles, including electric, hybrid, plug-in hybrid, and fuel-cell vehicles, there are many converters loaded by other converters. Therefore, the destabilizing effect of the load converters, which are called constant-power loads, is a major issue. In this paper, a novel nonlinear feedback, which is called loop cancellation, is introduced. This technique is used to cancel the destabilizing effect of the constant-power loads. Theoretically, any amount of constant-power load can be compensated by this technique, and it can identically be implemented on different types of converters. The effectiveness of the proposed technique has been verified by PSpice simulations and experimental results. © 2010 IEEE.

Wang D.,Queens University | Wang D.,International Rectifier | Liu Y.-F.,Queens University
IEEE Transactions on Power Electronics | Year: 2014

A new driving method for synchronous rectifier (SR) in LLC resonant converter is presented. By adding a zero-crossing noise filter (ZCNF) to the drain and source of the SR FET, the false-triggering of the SR can be effectively eliminated. Moreover, the resistor and the capacitor in the filter can be used as a compensator to solve the duty-cycle loss issue caused by the trace inductance of the MOSFET package. Only three passive components are needed in the proposed filter, which makes it reliable and easy to implement. Simulation and experimental results show that the ZCNF can significantly improve the reliability as well as the efficiency of the power circuit. A prototype of 400 V to 12 V 600-W half-bridge LLC resonant converter is built to verify the advantages of the ZCNF. An efficiency improvement of 0.8% is achieved by the ZCNF. © 2013 IEEE.

Rahimi A.M.,International Rectifier | Emadi A.,Illinois Institute of Technology
IEEE Transactions on Industrial Electronics | Year: 2010

One of the major issues in multiconverter power-electronic systems, which exist in different land, sea, air, and space vehicles, is the stability problem imposed by constant-power loads (CPLs). The research work done in this field has been focused mainly on continuous-conduction mode of operation. In this paper, we study the case when the loaded converter operates in discontinuous-conduction mode (DCM). We prove that the open-loop dc/dc converters operating in DCM are stable when they are loaded by CPLs. Furthermore, we present that the problem of feedback design for a converter operating in DCM and loaded by a CPL can be translated into a conventional feedback-design task for the same converter with a resistive load. Simulation and experimental results verify the presented discussion. © 2010 IEEE.

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