Electronic filter

About: Electronic filter is a research topic. Over the lifetime, 13207 publications have been published within this topic receiving 93063 citations. The topic is also known as: filter.

Voltage Balancing Control for a Three-Level Diode-Clamped Converter in a Medium-Voltage Transformerless Hybrid Active Filter

Abstract: This paper discusses a transformerless hybrid active filter integrated into the 6.6-kV, 1-MW adjustable-speed motor drive having a three-phase diode rectifier at the front end. The hybrid filter consists of an active filter using a three-level diode-clamped pulsewidth modulator converter rated at 60 kVA, and a 250-kVA passive filter tuned to the seventh harmonic frequency. They are directly connected in series without a transformer. This circuit configuration enables one to use 1.2-kV insulated gate bipolar transistors because the dc voltage of the three-level converter is 1.32 kV (20% of 6.6 kV). Voltage balancing control characterized by superimposing a sixth harmonic zero-sequence voltage on the active filter voltage reference in each phase is introduced to the three-level converter with triangle carrier modulation. Experimental waveforms obtained from a 400-V, 15-kW downscaled system verify the viability and effectiveness of the proposed hybrid filter, keeping the two dc capacitor voltages well-balanced.

Design of Tri-Band Filter Based on Stub Loaded Resonator and DGS Resonator

Abstract: A tri-band bandpass filter using stub loaded resonator (SLR) and defected ground structure (DGS) resonator is proposed in this letter. The DGS resonator on the lower plane constructs the first pass-band, and the SLR on the upper plane forms the second and third pass-bands, in which a DGS loop is properly used to provide the coupling between the SLRs. The three pass-bands are combined together with a common T-shaped feed line, and a reasonable tuning method is adopted to tune the three pass-bands with smooth responses. A compact tri-band filter with three pass-bands centered at 2.45, 3.5, and 5.25 GHz is designed and fabricated. The measurement results agree well with the full-wave electromagnetic designed responses.

Component working with acoustic waves and having a matching network

Abstract: A component working with acoustic bulk waves is provided that has a multi-layer substrate, where the multi-layer substrate comprises an integrated matching network and further circuit elements for adapting the electrical filter properties and can serve as carrier substrate for thin-film resonators.

Power System Harmonics and Passive Filter Designs

Abstract: Description: Power System Harmonics provides comprehensive coverage of generation, effects, and control of harmonics, and presents its state–of–the–art technology and advancements This book is the first to cover Power System Harmonics in–depth, including real world, illustrative case studies. Written by a well–known author with extensive experience designing harmonic filters, this book is written in a thorough and easy to read way, making it an invaluable resource for practicing engineers, consultants, and academia. Coverage includes new harmonic mitigation technologies, detailed step–by–step design of passive filters, interharmonics and flicker, and more. Readers who are new to the field will be able to grasp the subject through the many examples, case studies and illustrations. More advanced readers who are already familiar with Power System Harmonics will be able to learn about new insights and the latest developments. Covers new harmonic mitigation technologies, such as advances in converter technologies for harmonic mitigation and simultaneous improvement of power factor, and detailed step–by–step design of passive filters not covered in other publications Covers comprehensive models of power system components and power systems for harmonic analysis Includes simulations of wind and solar power plants In depth coverage of the effects of harmonics Includes EMTP simulations (Electromagnetic Transients Program) for real world situations Richly illustrated; covers IEEE and IEC standards, and provides extensive references for further reading Power system harmonics, and mitigation of their deleterious effects, has become a fast–developing topic and this book will perform as a useful reference now, and in the future.

A Frequency-Doubling Optoelectronic Oscillator Using a Polarization Modulator

Abstract: A novel realization of a frequency-doubling optoelectronic oscillator (OEO) using a polarization modulator (PolM) is proposed and experimentally demonstrated. In the proposed system, the PolM in combination with two optical polarizers connected via two polarization controllers (PCs) is operating as a two-output intensity modulator. One output of the intensity modulator is connected to the radio-frequency port of the PolM, to form an optoelectronic loop for the generation of a microwave signal with the fundamental frequency determined by the center frequency of a narrowband electronic filter. The other output of the intensity modulator provides a fundamental or frequency-doubled optically modulated microwave signal depending on the static phase term introduced by the PC before the polarizer. The proposed OEO is experimentally demonstrated. A fundamental microwave signal at 10 GHz or a frequency-doubled microwave signal at 20 GHz is generated. The phase noise performance of the generated microwave signal is also investigated.