The Research of Capacitive Load Influence on Inductive Voltage Divider

2013 ◽  
Vol 718-720 ◽  
pp. 1537-1541
Author(s):  
Yan Qiang Li ◽  
Wen Feng Li ◽  
Hai Ming Shao ◽  
Fei Peng Lin ◽  
Bo Liang ◽  
...  
Keyword(s):  
High Voltage ◽  
Voltage Dependence ◽  
Low Voltage ◽  
Analytical Formula ◽  
Voltage Divider ◽  
Model Analysis ◽  
Circuit Model ◽  
Capacitive Load ◽  
In Series ◽  
Inductive Voltage Divider

The inductive voltage divider is usually used and calibrated at no-load situation, but it also used at taking load situation. For example in the situation of measuring voltage dependence of low voltage capacitors and detecting high voltage bridge, the inductive voltage divider need to take two specific capacitors. This paper have researched the influence of specific capacitive load on its ratio and deduced the analytical formula through related experiments and circuit model analysis when it takes capacitor. And use the method of connecting resistor in series to compensate its ratio accuracy to 1×10-6 degree.

A scalable strategy toward compliant tandem yarn-shaped supercapacitors with high voltage output

2021 ◽  
Author(s):  
Juan Zhang ◽  
Qingli Xu ◽  
Xiangyu Qian ◽  
Xinhou Wang ◽  
Kun Zhang
Keyword(s):  
High Voltage ◽  
Aqueous Electrolyte ◽  
Low Voltage ◽  
Voltage Output ◽  
In Series

Yarn-shaped supercapacitors (YSSCs) based on aqueous electrolyte exhibit relatively low voltage output due to the low decomposition voltage of water (~1.23 V). Applying organic-based electrolyte or connecting YSSCs in series...

Design of a Two Levels Self-Integrating Capacitive Divider

2014 ◽  
Vol 599-601 ◽  
pp. 882-886
Author(s):  
Bao Feng Cao ◽  
Jiang Bing Fan ◽  
Li Jun Song ◽  
Xue Qin Zhang ◽  
Xin Li ◽  
...  
Keyword(s):  
High Voltage ◽  
Voltage Pulse ◽  
Low Voltage ◽  
Voltage Divider ◽  
High Voltage Pulse ◽  
Pulse Source ◽  
Voltage Level ◽  
Capacitive Divider ◽  
Capacitive Voltage ◽  
Capacitive Voltage Divider

A ims . A kind of two levels self-integrating capacitive voltage divider is designed to online measure high voltage nanosecond pulse. Methods. The circuit principle of capacitive divider is analyzed, and the theoretical voltage ratio is calculated. The calibration is carried out by using a low voltage pulse source. The divider with a primary voltage divide ratio 601 has been tested to frequency response exceed 1GHz. The second voltage divide ratio can be set flexibly using different ratio attenuators according to the different voltage level of the source. Result. Finally, this divider is used in measuring 600kV high voltage pulse source, and the experimental results show that the present coaxial capacitive divider is reliable and satisfactory for the measuring requirement in time domain and frequency domain.

scholarly journals Na+ Block and Permeation in a K+ Channel of Known Structure

2002 ◽  
Vol 120 (3) ◽  
pp. 323-335 ◽  
Author(s):  
Crina M. Nimigean ◽  
Christopher Miller
Keyword(s):  
High Voltage ◽  
Voltage Dependence ◽  
Low Voltage ◽  
Selectivity Filter ◽  
K Channel ◽  
Voltage Dependent

The effects of intracellular Na+ were studied on K+ and Rb+ currents through single KcsA channels. At low voltage, Na+ produces voltage-dependent block, which becomes relieved at high voltage by a “punchthrough” mechanism representing Na+ escaping from its blocking site through the selectivity filter. The Na+ blocking site is located in the wide, hydrated vestibule, and it displays unexpected selectivity for K+ and Rb+ against Na+. The voltage dependence of Na+ block reflects coordinated movements of the blocker with permeant ions in the selectivity filter.

scholarly journals Cascade frequency converters control features

2020 ◽  
Vol 241 ◽  
pp. 37
Author(s):  
A. Vorontsov ◽  
V. Glushakov ◽  
M. Pronin ◽  
Yu. Sychev
Keyword(s):  
High Voltage ◽  
Single Phase ◽  
Power Converters ◽  
Low Voltage ◽  
Frequency Converter ◽  
Frequency Converters ◽  
Three Phase ◽  
In Series ◽  
Load Characteristics ◽  
Active Rectifiers

The structures of systems with high-voltage cascade frequency converters containing multi-winding transformers and low-voltage low-power converters connected in series at each output phase of the load are considered. Low-voltage blocks contain three-phase diode or active rectifiers, DC capacitor filters, single-phase stand-alone voltage inverters and block disconnecting devices in partial modes (in case of failure when part of the blocks are disconnected). The possibilities of operation of cascade converters are determined, equations for correcting tasks to units in partial modes are given, tables of correction of tasks with estimates of achievable load characteristics are proposed. The results of experiments on the model of a powerful installation with a cascade frequency converter are presented, confirming the possibility of ensuring the symmetry of the load currents when disconnecting part of the blocks and the asymmetry of the circuit.  

An Auxiliary Power Supply for Gate Drive of Medium Voltage SiC Devices in High Voltage Applications

2018 ◽  
Vol 924 ◽  
pp. 836-840
Author(s):  
Bo Xue Hu ◽  
He Li ◽  
Zhuo Wei ◽  
Ya Feng Wang ◽  
Diang Xing ◽  
...  
Keyword(s):  
High Voltage ◽  
Power Supply ◽  
Low Voltage ◽  
High Reliability ◽  
Voltage Divider ◽  
Input Voltage ◽  
Voltage Regulation ◽  
Multilevel Converters ◽  
Medium Voltage ◽  
Auxiliary Power

A high-reliability auxiliary power supply (APS) for gate drive circuits is crucial to utilization of emerging medium voltage (MV ≥ 10 kV) Silicon Carbide (SiC) devices in high voltage applications. This paper proposes an active voltage divider based APS with lower arm voltage regulation. The proposed APS circuit is targeting the application of MV SiC devices in modular multilevel converters (MMCs). It can harvest energy from a MV (≥ 7 kV) dc bus to provide an isolated low voltage output to gate drive circuits of MV SiC devices. Compared to existing APS solutions, it can achieve a high input voltage (≥ 7 kV) with simple circuit structure and control scheme. In this paper, the working principle of the proposed APS is presented and a circuit design example is shown. A circuit prototype with 7 kV input and 15 V/10 W output has been built and tested to verify the effectiveness of the proposed solution.

scholarly journals Implementation and Control of an AC/DC/AC Converter for Double Wound Flywheel Application

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
J. G. Oliveira ◽  
H. Schettino ◽  
V. Gama ◽  
R. Carvalho ◽  
H. Bernhoff
Keyword(s):  
High Voltage ◽  
Low Voltage ◽  
Experimental Tests ◽  
Prototype System ◽  
Unity Power Factor ◽  
Good Efficiency ◽  
In Series ◽  
Vector Modulation ◽  
Acceleration Mode ◽  
And Control

An all-electric driveline based on a double wound flywheel, connected in series between main energy storage and a wheel motor, is presented. The flywheel works as a power buffer, allowing the battery to deliver optimized power. It also separates electrically the system in two sides, with the battery connected to the low voltage side and the wheel motor connected to the high voltage side. This paper presents the implementation and control of the AC/DC/AC converter, used to connect the flywheel high voltage windings to the wheel motor. The converter general operation and the adopted control strategy are discussed. The implementation of the AC/DC/AC converter has been described from a practical perspective. Results from experimental tests performed in the full-system prototype are presented. The prototype system is running with satisfactory stability during acceleration mode. Good efficiency and unity power factor could be achieved, based on vector control and space vector modulation.

scholarly journals Development of Broadband Resistive–Capacitive Parallel–Connection Voltage Divider for Transient Voltage Monitoring

Energies ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 451
Author(s):  
Shijun Xie ◽  
Zhou Mu ◽  
Weidong Ding ◽  
Zhenbo Wan ◽  
Shaochun Su ◽  
...  
Keyword(s):  
Power Systems ◽  
High Voltage ◽  
Low Voltage ◽  
Influence Factors ◽  
Voltage Divider ◽  
Step Response ◽  
Internal Electric Field ◽  
Scale Factors ◽  
Different Temperatures ◽  
Transient Voltages

The on-site measurement of transient voltages is of great significance in analyzing the fault cause of power systems and optimizing the insulation coordination of power equipment. Conventional voltage transformers normally have a narrow bandwidth and are unable to accurately measure various transient voltages in power systems. In this paper, a wideband parallel resistive–capacitive voltage divider is developed, which can be used for online monitoring of transient voltages in a 220 kV power grid. The structures of the high-voltage and low-voltage arms were designed. The internal electric field distribution of the high-voltage arm was analyzed. The influence factors and improvement techniques of the upper frequency limit were studied. The parameters of the elements of the divider were determined. The voltage withstand performances and scale factors under lightning impulses and AC and DC voltages, the temperature stabilities of scale factors and the step response and bandwidth of the developed voltage divider were tested. The results show that the deviations of the scale factors under various voltage waveforms and different temperatures ranging from −20 to 40 °C are within 3%. The withstand voltage meets the relevant requirements specified in IEC60071-1-2011. The step response 10~90% rise time is approximately 29 ns, and the 3 dB bandwidth covers the range of DC to 10 MHz.

scholarly journals High Voltage, Low Current High-Power Multichannel LEDs LLC Driver by Stacking Single-Ended Rectifiers with Balancing Capacitors

Electronics ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 529
Author(s):  
Kang Hyun Yi
Keyword(s):  
High Voltage ◽  
High Power ◽  
Low Voltage ◽  
Driving Voltage ◽  
Led Driver ◽  
Leakage Inductance ◽  
Voltage Stress ◽  
Driver Circuit ◽  
In Series ◽  
The Difference

In this paper, a new LLC converter for series-connected, high-voltage LEDs is proposed. The proposed LLC converter consists of two stacked, single-ended rectifiers and one balancing capacitor, to compensate for the current deviation of two individual LED strings. The proposed LLC LED driver can use a diode with low voltage stress, even if the secondary LED is connected in series to have a high driving voltage. In addition, even if several series-connected LEDs are changed into two-stacked structures, the balancing capacitor can compensate for the current deviation of the two separated LEDs, as well as the difference in leakage inductance of the two stacked single-ended rectifiers. The balancing capacitor can be made equal to the voltage tolerance of the stacked, single-ended rectifier diodes. The proposed circuit can be easily extended to a series channel LED driver circuit, without increasing the voltage stress. To verify the characteristics and operation of the proposed LLC LED driver, a 260W high-power LED driver is implemented.

scholarly journals A Current Monitor System in High-Voltage Applications in a Range from Picoamps to Microamps

Electronics ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 164
Author(s):  
Rabí Soto-Camacho ◽  
Sergio Vergara-Limon ◽  
María Aurora Diozcora Vargas-Treviño ◽  
Guy Paic ◽  
Jesús López-Gómez ◽  
...  
Keyword(s):  
High Voltage ◽  
Particle Physics ◽  
High Energy Physics ◽  
Low Voltage ◽  
High Energy ◽  
Electron Multiplier ◽  
Current Consumption ◽  
Constant Operation ◽  
Analog Part ◽  
In Series

In this article, we present a system to measure current in the range of 0 to 10 μA with high-voltage isolation up to 5 kV. This current monitor consists of three ammeters connected in series, to improve the resolution in the measurement. The design features several innovative elements such as using low voltage to provide power to the devices to measure the current and digitize it with a sampling frequency of 1 KHz, it is generated based on a DC-DC converter that produces three voltages, +12 V, −12 V, and 5 V, from a conventional 10 V source. The three voltages are referenced to the same floating ground. The DC-DC converter has a high voltage insulation up to 5 kV and four optocouplers with an insulation up to 20 kV are used to read the digitized data. The introduction of a DC-DC converter contributed to reduce the noise level in the analog part of the circuit which has been resolved implementing shields inside the board. In particle physics, several systems are used to detect particles in high-energy physics experiments such as Gas Electron Multiplier (GEM), micromegas, etc. GEMs suffer small deteriorations due to discharges in constant operation and require monitoring the current consumption at high frequency (1 kHz). In this work, we present the design and operation of a 0 to 10 μA auto scale ammeter. The results obtained by monitoring the current in a 10 × 10 cm2 GEM are shown.

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