Reliability Design of Control Circuit for Quartz Crystal Feeding System

2014 ◽  
Vol 722 ◽  
pp. 222-225
Author(s):  
Tao Yan ◽  
Gui Qin Jin ◽  
Ze Ding Wei
Keyword(s):  
Electromagnetic Interference ◽  
High Frequency ◽  
Electromagnetic Compatibility ◽  
Quartz Crystal ◽  
Feeding System ◽  
Large Power ◽  
Laser Marking ◽  
Reliability Design ◽  
Crystal Laser ◽  
Design And Manufacturing

Quartz crystal laser marking is the last process of quartz crystal production, and quartz crystal automatic feeding system works in harsh environment, like high frequency, strong electromagnetic interference, static electricity and large power, and feeding system itself also contains many electromagnetic interference factors, To ensure the system working stably and reliably, in the design and manufacturing of control system, using high quality components, the reasonable wiring and grounding, in the aspect of electromagnetic compatibility, hardware and software anti-interference measures were taken. Through a lot of test working in the laboratory and field, and the design scheme was modified for many times, it finally makes that the feeding system is so stable in the workplace that it could meet the requirements of the customer, and it has a certain guiding significance for the design of other mechanical and electrical products production.

Design and Implementation of Software for Quartz Crystal Feeding System

2014 ◽  
Vol 722 ◽  
pp. 243-246
Author(s):  
Tao Yan ◽  
Gui Qin Jin ◽  
Ze Ding Wei
Keyword(s):  
Quartz Crystal ◽  
Main Function ◽  
Feeding System ◽  
Working Process ◽  
Laser Marking ◽  
Equipment Operation ◽  
Design And Implementation ◽  
Crystal Laser ◽  
Man Machine Dialogue ◽  
And Control

The paper mainly introduced the working process of automatic feeding system for quartz crystal laser marking, elaborated the human-computer interaction and control software design and implementation. System used double CPU system to control the mechanical parts movement and to send the laser marking control signal, and to conduct the man-machine dialogue. At first, the system realized the main function such as structured programming, reasonable allocation of system resources, and the software anti-interference design. Eventually system realized the automatic feeding and laser marking of quartz crystal, and was favorable to the effective management of the equipment operation personnel, and to meet the requirements of the user.

Electromagnetic Compatibility Analysis Method for FBAR Devices

2015 ◽  
Vol 719-720 ◽  
pp. 452-460
Author(s):  
Yang Gao ◽  
Bin Zhou ◽  
Yi He ◽  
Wan Jing He
Keyword(s):  
Electric Fields ◽  
Electromagnetic Interference ◽  
High Frequency ◽  
Electromagnetic Compatibility ◽  
Effective Permittivity ◽  
Element Model ◽  
Acoustic Resonator ◽  
Simulation Software ◽  
Property A ◽  
Compatibility Analysis

With the increasing of resonant frequency and integration of film bulk acoustic resonator (FBAR), the electromagnetic interference (EMI) of FBAR devices appears to be extremely important. The electric fields of the common electrical model and finite element model are assumed to be quasi-static and cannot simulate the electromagnetic (EM) property. A 3-D EM model of FBAR is achieved by means of high frequency EM simulation software HFSS. A real-time simulation of EM distributed effects, EM coupling and piezoelectric effects is achieved by employing an effective permittivity in the EM model. The effects of the high frequency EM distributed effects and the EM coupling on resonant characteristics are analyzed. By optimizing the distance between FBAR and components, introducing substrate materials with different permittivity, the EM coupling is effectively reduced.

scholarly journals Analysis of Permanent Magnet Motors in High Frequency—A Review

2021 ◽  
Vol 11 (14) ◽  
pp. 6334
Author(s):  
Yerai Moreno ◽  
Gaizka Almandoz ◽  
Aritz Egea ◽  
Beñat Arribas ◽  
Ander Urdangarin
Keyword(s):  
Finite Element ◽  
Electromagnetic Interference ◽  
High Frequency ◽  
Electromagnetic Compatibility ◽  
Equivalent Circuit Model ◽  
Design Parameters ◽  
Electrical Machine ◽  
Element Analysis ◽  
Electrical Equivalent Circuit ◽  
Electric Drives

Electric drives consume a great amount of the world’s energy, and it will keep increasing due to the electromobility trend. Thus, the efficiency of electric drives must be improved to reach the desired sustainability goal. The Silicon Carbide devices contribute to this objective due to their high working frequency and lower switching losses. However, working at higher frequencies may bring serious Electromagnetic Compatibility (EMC) problems, as well as insulation stress and higher bearing currents. Hence, it is important to have an electrical machine electrical equivalent circuit model to predict the electromagnetic interference levels. This review summarizes the current state of the art in electrical machine modeling and analysis in high frequency. The main analysis tools as Finite Element Methods, analytic and measurement-based tools are compared in their application on high-frequency electrical machine analysis. Then, different machine high-frequency models are reported, detailing their individual features. Additionally, the influence of the machine design parameters in EMC behavior is outlined for future analysis. All in all, Finite Element analysis is the most accurate tool for high-frequency analysis, provided that mesh size is thinner than the skin depth. It is also concluded that the winding placement is an essential parameter to define the high-frequency behavior of the machine.

scholarly journals Electromagnetic Spectrum of the Corona Discharge and Their Fundamental Frequency

2021 ◽  
Author(s):  
Luis E. Martínez Santos ◽  
Roberto Linares y Miranda ◽  
Fermín P. Espino-Cortés
Keyword(s):  
Corona Discharge ◽  
Electromagnetic Interference ◽  
High Frequency ◽  
Communication Systems ◽  
Electromagnetic Compatibility ◽  
Design Criterion ◽  
Past Century ◽  
Electromagnetic Spectrum ◽  
Radio Communication ◽  
High Voltage Direct Current

Historically, the Electromagnetic Compatibility (EMC) began with the disturbances at the radio navigation systems generated by the electrical power distribution lines; hence it was referred to as Radio Interference (RI). This disturbance is an Electromagnetic Interference (EMI). Although this type of EMI has been studied since the first decades of the past century, it still maintains a continued interest of the researchers, especially with the Corona Discharge (CD), generated by High Voltage Direct Current (HVDC) systems. Because of its design criterion and the concern that this phenomenon may affect the new radio communication systems in the very high frequency (VHF), ultra high frequency (UHF), and microwave bands, interest in their studies continues. In this chapter, an analysis of the electromagnetic spectrum of the CD is presented. The CD is generated at a short transmission line located within a semi-anechoic chamber. To be sure of the phenomenon, the CD is identified by its current pulse, which is well studied. The instruments used are an oscilloscope of 2 GHz and 2 GS/s, a spectrum analyzer, and an EMI test receiver. The results show that the CD concentrates its energy at frequencies below 70 MHz. In the UHF band, only narrowband signals very separated were found, with levels that cannot affect radio communication systems.

scholarly journals High-Frequency Electromagnetic Interference Diagnostics

2021 ◽  
Author(s):  
Ling Zhang ◽  
Yuru Feng ◽  
Jun Fan ◽  
Er-Ping Li
Keyword(s):  
Statistical Analysis ◽  
Electromagnetic Interference ◽  
High Frequency ◽  
Electromagnetic Compatibility ◽  
Measurement Techniques ◽  
Emission Source ◽  
Far Field ◽  
Large Network ◽  
Typical Type ◽  
Coupling Path

Electromagnetic interference (EMI) is becoming more troublesome in modern electronic systems due to the continuous increase of communication data rates. This chapter reviews some new methodologies for high-frequency EMI diagnostics in recent researches. Optical modules, as a typical type of gigahertz radiator, are studied in this chapter. First, the dominant radiation modules and EMI coupling paths in an explicit optical module are analyzed using simulation and measurement techniques. Correspondingly, practical mitigation approaches are proposed to suppress the radiation in real product applications. Moreover, an emission source microscopy (ESM) method, which can rapidly localize far-field radiators, is applied to diagnose multiple optical modules and identify the dominant sources. Finally, when numerous optical modules work simultaneously in a large network router, a formula based on statistical analysis can estimate the maximum far-field emission and the probability of passing electromagnetic compatibility (EMC) regulations. This chapter reviews a systematic procedure for EMI diagnostics at high frequencies, including EMI coupling path analysis and mitigation, emission source localization, and radiation estimation using statistical analysis.

scholarly journals Influence of Aircraft Power Electronics Processing on Backup VHF Radio Systems

Electronics ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 777
Author(s):  
Jan Leuchter ◽  
Radim Bloudicek ◽  
Jan Boril ◽  
Josef Bajer ◽  
Erik Blasch
Keyword(s):  
Power Electronics ◽  
Electromagnetic Interference ◽  
Communication Systems ◽  
Electromagnetic Compatibility ◽  
Intermediate Frequency ◽  
Radio Communication ◽  
Very High Frequency ◽  
Switching Power ◽  
Radio Systems ◽  
The Impact

The paper describes the influence of power electronics, energy processing, and emergency radio systems (ERS) immunity testing on onboard aircraft equipment and ground stations providing air traffic services. The implementation of next-generation power electronics introduces potential hazards for the safety and reliability of aircraft systems, especially the interferences from power electronics with high-power processing. The paper focuses on clearly identifying, experimentally verifying, and quantifiably measuring the effects of power electronics processing using switching modes versus the electromagnetic compatibility (EMC) of emergency radio systems with electromagnetic interference (EMI). EMI can be very critical when switching power radios utilize backup receivers, which are used as aircraft backup systems or airport last-resort systems. The switching power electronics process produces interfering electromagnetic energy to create problems with onboard aircraft radios or instrument landing system (ILS) avionics services. Analyses demonstrate significant threats and risks resulting from interferences between radio and power electronics in airborne systems. Results demonstrate the impact of interferences on intermediate-frequency processing, namely, for very high frequency (VHF) radios. The paper also describes the methodology of testing radio immunity against both weak and strong signals in accordance with recent aviation standards and guidance for military radio communication systems in the VHF band.

scholarly journals Reduction of Electromagnetic Interference Using ZnO-PCL Nanocomposites at Microwave Frequency

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Abubakar Yakubu ◽  
Zulkifly Abbas ◽  
Nor Azowa Ibrahim ◽  
Ahmad Fahad
Keyword(s):  
Electromagnetic Interference ◽  
Electromagnetic Compatibility ◽  
Environmentally Friendly ◽  
Microwave Frequency ◽  
Absorption Properties ◽  
Radio Emissions ◽  
Surface Areas ◽  
Home Appliance ◽  
Coaxial Probe ◽  
Very High

In industrial equipment and home appliance applications, the electromagnetic compatibility compliance directive (ECCD) demands that electromagnetic interference side effects be eliminated or marginally minimized. The equipment must not disturb radio and telecommunication as well as other appliances. Additionally the ECCD also governs the immunity of such equipment to interference and seeks to ensure that this equipment is not disturbed by radio emissions when used as intended. Many types of absorbing materials are commercially available. However, many are expensive and not environmentally friendly. It is in the light of the above that we studied the electromagnetic absorption properties of ZnO-PCL nanocomposites prepared from cheap and abundant resources which are environmentally friendly (zinc and polycaprolactone). The test was carried out using a microstrip, open ended coaxial probe, and vector network analyzer. Amongst other findings, result showed that the ZnO-PCL nanocomposite has the capability of attenuating microwave frequency up to −18.2 dB due to their very high specific surface areas attributed to the nanofillers at 12 GHz.

Nanoelectromagnetic of the N-doped single wall carbon nanotube in the extremely high frequency band

Nanoscale ◽  
2017 ◽  
Vol 9 (37) ◽  
pp. 14192-14200 ◽  
Author(s):  
B. Aïssa ◽  
M. Nedil ◽  
J. Kroeger ◽  
M. I. Hossain ◽  
K. Mahmoud ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
Frequency Band ◽  
Electromagnetic Interference ◽  
High Frequency ◽  
High Electrical Conductivity ◽  
High Frequency Band ◽  
High Demand ◽  
Extremely High Frequency ◽  
Minimal Thickness

Materials offering excellent mechanical flexibility, high electrical conductivity and electromagnetic interference (EMI) attenuation with minimal thickness are in high demand, particularly if they can be easily processed into films.

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