scholarly journals Network Power Sharing Device: Power Sharing Via USB to Power Port with Output Voltage/Current 17v-19v/4A-

10.28945/3283 ◽  
2008 ◽  
Author(s):  
Oludele Awodele ◽  
Oghenerukevwe Onoruvie ◽  
Sharon Okoruwa ◽  
Victor Dibia
Keyword(s):  
Power Supply ◽  
Output Voltage ◽  
Third World ◽  
Ease Of Use ◽  
Power Sharing ◽  
Data Loss ◽  
System Specification ◽  
Notebook Computers ◽  
Data Compromise ◽  
Network Power

The ongoing migration of mobile lifestyles and the increasing capabilities of portable systems will continue to drive demand for more flexible and portable battery charging systems (Brown, 2006). The use of computers has been limited due to lack of constant availability of power -issues such as data loss, transaction breakages, data compromise have become major challenges in areas (especially third world countries) where power supply is a problem. Thus there is a need to provide a means of power sharing through USB for computers to share power between two systems (with special emphasis on laptops). Related works/ research has shown that the power sharing between a computer system has only been possible with smaller devices like iPod, since the USB port gives 500mA/ +5V maximum. This paper describes a device that draws similar voltage and current as the iPod for a destination system after an amplification operation has been carried out on the supplied voltage and power. The power being transferred is initiated by the software driver on detection with destination voltage and current 18V-19V/4.5A with female connector. After construction it will be available to notebook computers system specification and very useful in emergencies and available to all due to its ease of use.

A Bandgap Reference with Temperature Coefficient of 13.2 ppm/°C

2014 ◽  
Vol 981 ◽  
pp. 66-69
Author(s):  
Ming Yuan Ren ◽  
En Ming Zhao
Keyword(s):  
Power Supply ◽  
Process Simulation ◽  
Output Voltage ◽  
Operating Temperature ◽  
Cmos Process ◽  
Bandgap Reference ◽  
Analysis Method ◽  
Operation Condition ◽  
Reference Circuit ◽  
Simulation Results

This paper presents a design and analysis method of a bandgap reference circuit. The Bandgap design is realized through the 0.18um CMOS process. Simulation results show that the bandgap circuit outputs 1.239V in the typical operation condition. The variance rate of output voltage is 0.016mV/°C? with the operating temperature varying from-60°C? to 160°C?. And it is 3.27mV/V with the power supply changes from 1.8V to 3.3V.

scholarly journals Stability of electric characteristics of solar cells for continuous power supply

2015 ◽  
Vol 30 (4) ◽  
pp. 306-310 ◽  
Author(s):  
Nebojsa Stojanovic ◽  
Koviljka Stankovic ◽  
Tomislav Stojic ◽  
Djordje Lazarevic
Keyword(s):  
Solar Cells ◽  
Working Conditions ◽  
Mobile Communication ◽  
Power Supply ◽  
Output Voltage ◽  
Rechargeable Batteries ◽  
Electronic Systems ◽  
Output Characteristics ◽  
Continuous Power ◽  
Photovoltaic Solar Cells

This paper investigates the output characteristics of photovoltaic solar cells working in hostile working conditions. Examined cells, produced by different innovative procedures, are available in the market. The goal was to investigate stability of electric characteristics of solar cells, which are used today in photovoltaic solar modules for charging rechargeable batteries which, coupled with batteries, supply various electronic systems such as radio repeaters on mountains tops, airplanes, mobile communication stations and other remote facilities. Charging of rechargeable batteries requires up to 25 % higher voltage compared to nominal output voltage of the battery. This paper presents results of research of solar cells, which also apply to cases in which continuous power supply is required.

scholarly journals Inter-Stage Output Voltage Amplitude Improvement Circuit Integrated with Class-B Transmit Voltage Amplifier for Mobile Ultrasound Machines

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 6244 ◽  
Author(s):  
Kiheum You ◽  
Hojong Choi
Keyword(s):  
Power Supply ◽  
Piezoelectric Transducer ◽  
Output Voltage ◽  
Piezoelectric Transducers ◽  
Voltage Amplitude ◽  
Voltage Amplifier ◽  
Class B ◽  
Voltage Signal ◽  
Limited Power ◽  
Limited Power Supply

Piezoelectric transducers are triggered by the output voltage signal of a transmit voltage amplifier (TVA). In mobile ultrasound instruments, the sensitivity of piezoelectric transducers is a critical parameter under limited power supply from portable batteries. Therefore, the enhancement of the output voltage amplitude of the amplifier under limited power supply could increase the sensitivity of the piezoelectric transducer. Several-stage TVAs are used to increase the voltage amplitude. However, inter-stage design issues between each TVA block may reduce the voltage amplitude and bandwidth because the electronic components of the amplifier are nonlinearly operated at the desired frequency ranges. To compensate for this effect, we propose a novel inter-stage output voltage amplitude improvement (OVAI) circuit integrated with a class-B TVA circuit. We performed fundamental A-mode pulse-echo tests using a 15-MHz immersion-type piezoelectric transducer to verify the design. The echo amplitude and bandwidth when using an inter-stage OVAI circuit integrated with a class-B TVA circuit (696 mVPP and 29.91%, respectively) were higher than those obtained when using only the class-B TVA circuit (576 mVPP and 24.21%, respectively). Therefore, the proposed OVAI circuit could be beneficial for increasing the output amplitude of the class-B TVA circuit for mobile ultrasound machines.

scholarly journals Lyapunov Stability and Performance Analysis of the Fractional Order Sliding Mode Control for a Parallel Connected UPS System under Unbalanced and Nonlinear Load Conditions

Energies ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 3475 ◽  
Author(s):  
Muhammad Ali ◽  
Muhammad Aamir ◽  
Hussain Sarwar Khan ◽  
Asad Waqar ◽  
Faheem Haroon ◽  
...  
Keyword(s):  
Sliding Mode Control ◽  
Critical Load ◽  
Lyapunov Stability ◽  
Control Strategy ◽  
Power Supply ◽  
Output Voltage ◽  
Sliding Mode ◽  
Voltage Control Strategy ◽  
Nonlinear Load ◽  
Load Conditions

Parallel-connected uninterruptible power supply (UPS) systems have been used to maintain power supply to the critical load in order to increase power capacity and system reliability. This paper presents a robust and precise voltage control strategy for parallel-connected UPS systems. Each parallel-connected UPS system consists of a three-phase inverter with an output inductor-capacitor (LC) filter directly connected to an AC common bus in order to feed the critical load. Fractional-order sliding mode control (FOSMC) is proposed to maintain the quality of the output voltage despite linear, unbalanced and/or nonlinear load condition. The Riemann-Liouville (RL) fractional derivative is employed in designing the sliding surface. The voltage control strategy effectively eliminates the parametric uncertainties, external disturbances, and reduce the total harmonic distortion (THD) of the output voltage. Furthermore, it also maintains very good voltage regulation such as dynamic response and steady-state error under the nonlinear or unbalanced load conditions. The stability of the proposed controller is proven by applying Lyapunov stability theory. Droop control approach and virtual output impedance (VOI) loop are investigated to guarantee the accurate active and reactive power-sharing for parallel-connected UPS system. Finally, the implementation of the control scheme is carried out by using MATLAB/Simulink real-time environment.

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