scholarly journals Designing and Development of 30 KV DC Rectifier Amplifier for Polling Optimization on PVDF Thin Film

2014 ◽  
Vol 15 (1) ◽  
pp. 23
Author(s):  
Ambran Hartono ◽  
Mitra Djamal ◽  
Suparno Satira ◽  
Herman Bahar ◽  
Ramli Ramli ◽  
...  
Keyword(s):  
Thin Films ◽  
Electric Field ◽  
High Voltage ◽  
Output Voltage ◽  
Pvdf Film ◽  
Test Results ◽  
Output Stability ◽  
Voltage Amplifier ◽  
Design And Manufacture

DC high voltage amplifier is one of the important components to support of PVDF thin films polling equipment. Hardware polling is a very important tool in the characterization of PVDF thin films to increase piezoelectric properties. The existence of the problem will be difficult to obtain a high voltage DC sources of lead in the market encouraged us to design and create high-voltage DC source. In research that has been done I've been able to design and create high-voltage amplifier 30 KV DC as a producer of high electric field. To validate the performance of this high voltage DC amplifier has created further testing and measuring the output voltage. Testing is performed to determine the precision, accuracy and stability of the output voltage of the amplifier for more than 60 minutes. From the test results and output measurements performed show that the relative error of 4.5%. Tool output stability is good enough for a span of 30 minutes. This indicates that the design and manufacture of high DC voltage gain have been successful.   Keywords: DC Amplifier, Electric field, High voltage, Polling, PVDF Film

Heartbeat Monitoring Technique Based on Corona-Poled PVDF Film Sensor for Smart Apparel Application

2007 ◽  
Vol 124-126 ◽  
pp. 299-302 ◽  
Author(s):  
You Min Chang ◽  
Jong Soon Lee ◽  
Kap Jin Kim
Keyword(s):  
Electric Field ◽  
Polyvinylidene Fluoride ◽  
Ferroelectric Properties ◽  
Computer Applications ◽  
Polymer Materials ◽  
Pvdf Film ◽  
Internal Electric Field ◽  
Film Sensor ◽  
Β Phase ◽  
Voltage Amplifier

Flexible piezoelectric polymer materials for smart apparel and wearable computer applications are of great interest. Among known ferroelectric and piezoelectric polymers, polyvinylidene fluoride (PVDF) exhibit β-phase under poling and is known to give highest piezo-, pyro-, and ferroelectric properties. Previous reports suggests that, during corona poling of the PVDF film, a high surface electric potential is generated resulting in a high internal electric field within the polymer film causing the polarization of the dipoles along the direction of the applied electric field. The resultant phase change from α- to β-phase and the dipole switching generates displacement of charges or piezoelectricity. And also mechanical variation would change dipole density of PVDF film. In this report, we measured human heartbeat signal from an DAQ interfaced with a custommade voltage-amplifier with specific frequency filtering function using the corona-poled PVDF film of various sizes and thickness as a piezoelectric sensor and analyzed it. We employed elastic textile band to sensor system for comfortable fit on wrist or ankle. And then, we found the feasibility of applying flexible PVDF film sensor to smart apparel application which can sense heartbeat rate, blood pressure, respiration rate, accidental external impact on human body, etc.

scholarly journals Electrical Characterization of a New Crosslinked Copolymer Blend for DC Cable Insulation

Energies ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1434 ◽  
Author(s):  
Sarath Kumara ◽  
Xiangdong Xu ◽  
Thomas Hammarström ◽  
Yingwei Ouyang ◽  
Amir Masoud Pourrahimi ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Electric Field ◽  
Surface Potential ◽  
High Voltage ◽  
Direct Current ◽  
Electrical Characterization ◽  
Copolymer Blend ◽  
New Material ◽  
Potential Decay

To design reliable high voltage cables, clean materials with superior insulating properties capable of operating at high electric field levels at elevated temperatures are required. This study aims at the electrical characterization of a byproduct-free crosslinked copolymer blend, which is seen as a promising alternative to conventional peroxide crosslinked polyethylene currently used for high voltage direct current cable insulation. The characterization entails direct current (DC) conductivity, dielectric response and surface potential decay measurements at different temperatures and electric field levels. In order to quantify the insulating performance of the new material, the electrical properties of the copolymer blend are compared with those of two reference materials; i.e., low-density polyethylene (LDPE) and peroxide crosslinked polyethylene (XLPE). It is found that, for electric fields of 10–50 kV/mm and temperatures varying from 30 °C to 70 °C, the DC conductivity of the copolymer blend is in the range of 10−17–10−13 S/m, which is close to the conductivity of crosslinked polyethylene. Furthermore, the loss tangent of the copolymer blend is about three to four times lower than that of crosslinked polyethylene and its magnitude is on the level of 0.01 at 50 °C and 0.12 at 70 °C (measured at 0.1 mHz and 6.66 kV/mm). The apparent conductivity and trap density distributions deduced from surface potential decay measurements also confirmed that the new material has electrical properties at least as good as currently used insulation materials based on XLPE (not byproduct-free). Thus, the proposed byproduct-free crosslinked copolymer blend has a high potential as a prospective insulation medium for extruded high voltage DC cables.

A Dedicated Device Based on the Spatial Electric Field for Measuring Voltage of Catenary System

2015 ◽  
Vol 734 ◽  
pp. 109-112
Author(s):  
Jia Song ◽  
Xiao Dong Zhang ◽  
Yue Jia Sun
Keyword(s):  
Electric Field ◽  
Field Test ◽  
High Voltage ◽  
Test Results ◽  
Induced Voltage ◽  
Voltage Measurement ◽  
Measuring Device ◽  
Voltage Difference ◽  
The Earth ◽  
Catenary System

The traditional high-voltage electroscope is difficult to distinguish normal catenary voltage and induced voltage. In order to solve the problem, a method to measure high-voltage based on the effect of space electric field is proposed and a dedicated catenary voltage measuring device is made. The method follows divider effect of spatial capacitance and achieves quantitative voltage measurement without grounding by measuring and transforming the induced voltage difference of the capacitance which is placed between the catenary system and the earth and showing the actual catenary voltage value in LCD. The device can effectively distinguish catenary normal voltage and induced voltage, then reflects catenary real operation state. The field test results show the device meets the requirement of catenary voltage measurement.

scholarly journals Growth and Characterization of Single Crystalline Bi4Ge3O12Fibers for Electrooptic High Voltage Sensors

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Stephan Wildermuth ◽  
Klaus Bohnert ◽  
Hubert Brändle ◽  
Jean-Marie Fourmigue ◽  
Didier Perrodin
Keyword(s):  
Optical Properties ◽  
Electric Field ◽  
High Voltage ◽  
Bismuth Germanate ◽  
Czochralski Technique ◽  
Voltage Sensors ◽  
Fiber Growth ◽  
Electric Insulation ◽  
Lower Electric Field

The micro-pulling-down technique for crystalline fiber growth is employed to grow fibers and thin rods of bismuth germanate, Bi4Ge3O12(BGO), for use in electrooptic high voltage sensors. The motivation is the growth of fibers that are considerably longer than the typical lengths (100–250 mm) that are achieved by more conventional growth techniques like the Czochralski technique. At a given voltage (several hundred kilovolts in high voltage substation applications) longer sensors result in lower electric field strengths and therefore more compact and simpler electric insulation. BGO samples with lengths up to 850 mm and thicknesses from 300 μm to 3 mm were grown. Particular challenges in the growth of BGO fibers are addressed. The relevant optical properties of the fibers are characterized, and the electrooptic response is investigated at voltages up to .

Program-Controlled Driving Power Supply for Single-Chamber and Single-Vibrator Piezoelectric Pump

2013 ◽  
Vol 401-403 ◽  
pp. 1703-1706
Author(s):  
Ye Ming Sun ◽  
Guang Ming Cheng ◽  
Ping Zeng
Keyword(s):  
High Voltage ◽  
Power Supply ◽  
Output Voltage ◽  
Low Cost ◽  
Voltage Controlled Oscillator ◽  
Piezoelectric Pump ◽  
Single Chamber ◽  
Voltage Amplifier ◽  
Pump Output ◽  
Sine Signal

According to driving requirements of single-chamber and single-vibrator piezoelectric pump, a program-controlled driving power supply is designed. The power supply first utilizes D/A converter and voltage-controlled oscillator to generate sine signal with adjustable frequency, then it changes the amplitude of signal by T-type resistor network. At last, it utilizes high-voltage amplifier and power amplifier to obtain a high voltage and a large current to realize drive of piezoelectric pump. Output voltage and frequency of power supply can be adjusted under control of program. Prototype of driving power supply is manufactured and its output performance is test. Experimental results show that, in power supply, waveform of the sine signal is satisfying, range of output voltage is 0-170V and range of output frequency is 5-600Hz. Power supply designed meets the driving requirements of piezoelectric pump, and also has merits of small size, light weight and low cost.

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