Effects of electromagnetic interference on controller-computer upsets and system stability

2000 ◽  
Vol 8 (2) ◽  
pp. 351-357 ◽  
Author(s):  
H. Kim ◽  
A.L. White ◽  
K.G. Shin
Keyword(s):  
Electromagnetic Interference ◽  
System Stability

scholarly journals A Low EMI DC-DC Buck Converter with a Triangular Spread-Spectrum Mechanism

Energies ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 856
Author(s):  
Jing-Yuan Lin ◽  
Yi-Chieh Hsu ◽  
Yo-Da Lin
Keyword(s):  
Spread Spectrum ◽  
Electromagnetic Interference ◽  
Output Voltage ◽  
Buck Converter ◽  
Circuit Board ◽  
System Stability ◽  
Maximum Efficiency ◽  
Load Current ◽  
Voltage Range ◽  
Switching Regulators

In this paper, a triangular spread-spectrum mechanism is proposed to suppress the electromagnetic interference (EMI) of a DC-DC buck converter. The proposed triangular spread-spectrum mechanism, which is implemented in the chip, can avoid modifying the printed circuit board of switching regulators. In addition, a lower ripple of output voltage of switching regulators and a better system stability can be realized by the inductive DC resistance (DCR) current sensing circuit. The chip is fabricated by using TSMC 0.18-μm 1P6M CMOS technology. The chip area including PADs is 1.2 × 1.15 mm2. The input voltage range is 2.7~3.3 V and the output voltage is 1.8 V. The maximum load current is 700 mA. The off-chip inductor and capacitor are 3.3 μH and 10 μF, respectively. The experimental results demonstrate that the maximum spur of the proposed DC-DC buck converter with the triangular spread-spectrum mechanism improves to 14dBm. Moreover, the transient recovery time of step-up and step-down loads are both 5 μs. The measured maximum efficiency is 94% when the load current is 200 mA.

scholarly journals High performance DC/DC buck converter using sliding mode controller

2019 ◽  
Vol 10 (4) ◽  
pp. 1806
Author(s):  
Mustafa Abbas Fadel Al-Qaisi ◽  
Mohanad A. Shehab ◽  
Ammar Al-Gizi ◽  
Mohammed Al-Saadi
Keyword(s):  
Electromagnetic Interference ◽  
High Performance ◽  
Pulse Width Modulation ◽  
Sliding Mode ◽  
Maximum Output Power ◽  
Buck Converter ◽  
System Stability ◽  
Control Technique ◽  
Sliding Mode Controller ◽  
Maximum Output

<span>This paper investigated the performance of the sliding mode control technique for dc/dc converter using frequency response method. The applications of the step down type switching regulator) buck converter (are found in the devices that use batteries as power source like laptop, cell phones, electric vehicle, and recently, it  has also been used in the renewable energy processing, as a maximum output power can be achieved at higher efficiency. In order to optimize the efficiency and for convenient power management, the issues like power on transients, the effect of load variation, Switching and Electromagnetic interference (EMI) losses has to be overcome for which controllers are used. In the proposed method, pulse width modulation (PWM) based on proportional-integral-derivative sliding mode voltage controller (PID SMVC) is designed for a buck converter and the response for appropriate control parameters has been obtained. The system stability has been examined and analyzed from the performance characteristics, which shows clearly that the buck converter controlled by the sliding mode controller has fast dynamic response and it’s very efficient for various applications.</span>

High-voltage monitoring by the fiber-optic recirculating measuring system

2020 ◽  
pp. 38-44
Author(s):  
A. V. Polyakov ◽  
M. A. Ksenofontov
Keyword(s):  
Optical Fibers ◽  
High Voltage ◽  
Optical Sensors ◽  
Electromagnetic Interference ◽  
Fiber Optic ◽  
Electric Power Industry ◽  
Measuring System ◽  
Voltage Range ◽  
External Electromagnetic Fields ◽  
Optic Communication

Optical technologies for measuring electrical quantities attract great attention due to their unique properties and significant advantages over other technologies used in high-voltage electric power industry: the use of optical fibers ensures high stability of measuring equipment to electromagnetic interference and galvanic isolation of high-voltage sensors; external electromagnetic fields do not influence the data transmitted from optical sensors via fiber-optic communication lines; problems associated with ground loops are eliminated, there are no side electromagnetic radiation and crosstalk between the channels. The structure and operation principle of a quasi-distributed fiber-optic high-voltage monitoring system is presented. The sensitive element is a combination of a piezo-ceramic tube with an optical fiber wound around it. The device uses reverse transverse piezoelectric effect. The measurement principle is based on recording the change in the recirculation frequency under the applied voltage influence. When the measuring sections are arranged in ascending order of the measured effective voltages relative to the receiving-transmitting unit, a relative resolution of 0,3–0,45 % is achieved for the PZT-5H and 0,8–1,2 % for the PZT-4 in the voltage range 20–150 kV.

Geomechanics of the “quarry - internal dump - natural environment” system stability

2018 ◽  
pp. 176-187
Author(s):  
M.S. Chetveryk ◽  
◽  
K.V. Babiy ◽  
O.A. Bubnova ◽  
V.N. Grebennik ◽  
...  
Keyword(s):  
Natural Environment ◽  
System Stability ◽  
Internal Dump

Analysis and Evaluation of Electromagnetic Interference between ThruChip Interface and LC-VCO

2016 ◽  
Vol E99.C (6) ◽  
pp. 659-662 ◽  
Author(s):  
Junichiro KADOMOTO ◽  
So HASEGAWA ◽  
Yusuke KIUCHI ◽  
Atsutake KOSUGE ◽  
Tadahiro KURODA
Keyword(s):  
Electromagnetic Interference ◽  
Analysis And Evaluation ◽  
Lc Vco
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