Voltage Source Circuit Research Articles

Memristor‐based circuit design of continuously adjustable direct‐current voltage source

SummaryDirect‐current (DC) voltage source is an essential part in many occasions such as integrated systems and laboratory electricity, which can provide a stable and continuous voltage supply. Traditional voltage sources are frequently designed by bipolar junction and field effect transistors. Compared with these devices, memristors have lower power consumption and smaller size. At present, memristors have been used in the design of logic circuits and other functional circuits, which could provide a new idea for applying memristors into the design of DC voltage sources. In this paper, a memristor‐based circuit design of continuously adjustable DC voltage source is proposed for the first time. The proposed DC voltage source circuit only consists of two modules and has a simple structure. In addition, the output voltage amplitude of this voltage source can be continuously adjusted by the application of a control signal due to the utility of the memristor. The operation process of the whole circuit and the mathematical model between the input and output are analyzed in detail, which is greatly beneficial for use and expansion. Finally, the effectiveness of the circuit is verified in PSPICE, and the accuracy of the output amplitude of the voltage source is also investigated.

Resonant Power Supply for Plasma Cleaning Based on Fuzzy Logic Power Tracking

The coaxial cylindrical reactor with a rotary nozzle is proposed to be used as the plasma torch of the plasma cleaning machine. The phase-shifted full bridge series resonance circuit is used as the power circuit topology. Because the voltage source load resonance circuit technology is mature, the cycle and difficulty of research and development on this basis are relatively small, and the corresponding control strategy and algorithm are relatively easy to achieve. At the same time, the voltage source circuit is smaller than the current source circuit, in line with the development trend of plasma cleaning equipment. In this paper, based on the phase shift full bridge series resonant circuit, the control strategy is compared and analyzed. Considering the response speed, control precision and efficiency, a PSPWM-PFM (Phase Shift Pulse Width Modulation- Pulse Frequency Modulation) hybrid modulation control strategy is proposed, which makes the system not only have a fast response speed but can also construct a soft switch and has a high efficiency. A maximum power tracking algorithm based on a fuzzy PFM was proposed to solve the problem that the plasma power supply deviated from the resonant frequency point easily due to environmental perturbation, and thus deviated from the maximum power point.

Design and simulation of reference voltage sources circuit in lasers

AbstractFor the design of reference voltage source circuits in lasers, there is a problem of low accuracy using general design approach, this paper proposes an improved high‐precision voltage source circuit design. Firstly, a suitable reference voltage source chip is selected, then the excitation source circuit with better stability is designed, a high‐order filter is designed for filtering, and finally a compensation circuit is designed to improve the accuracy of the lasers voltage source. The effect of the designed voltage source circuit was verified, and the simulation results showed that the designed voltage source circuit was improved in output voltage accuracy, stability, and noise level, achieving a voltage noise level of 0.978 μV/Hz1/2 at 0.1 mHz at an input voltage of 2V. The validity of the voltage source circuit used for the lasers is verified, providing a high reference value for improving the lasers accuracy in laser spectroscopy.

Применение метода расширенных функций описания при проектировании контура управления источником питания

The article is devoted to issues related to the design of a control loop of an energy converter, where the method of extended description functions is used as a tool for research and analysis of frequency characteristics. The object of research is a stabilized voltage source based on a bridge converter with an LLC-resonant circuit, designed for the needs of industrial equipment. Within the framework of this work, a single-loop feedback with stabilization of the output voltage level is considered. Based on the calculations, the voltage source circuit was simulated in the LTSpice circuit simulation environment.

A Time-Domain Electromagnetic Transmitter with Great Power and Large Current by Using a Closed-Loop Phase Shifting Control Strategy

A time-domain electromagnetic transmitter (TDET) with great power and large current was designed by using a closed-loop phase shifting control strategy. A clamping voltage source circuit was applied in this system to improve the falling edge of emission current and shorten the turn-off time. The simulated results showed that this TDET exhibited the advantages including a large current, strong capability for rapid turn-off, stably output voltage, preferably dynamic performance, a widely adjustable range in transmitting voltage, accurate measurement precision.

An Approximate Closed-Form Transfer Function Model for Multiconductor Transmission Lines

This brief presents an intuitive, simple, and widely applicable approximate closed-form transfer function model for multiconductor transmission lines (MTLs). Rigorous closed-form transfer functions are derived from the telegrapher’s equation and approximated for a wide range of MTLs that satisfy validity conditions. Theoretical error bounds are also proposed and tightly estimate the approximation errors. The approximate formulas are simple yet accurate, and can be intuitively interpreted by a simple voltage-controlled voltage source circuit model. In demonstration, we show that the proposed model allows designers intuitively to understand and accurately to analyze complex MTLs.

Bipolar Triangular Wave Current Pulse Inverter for Shallow TEM Survey

A bipolar triangular wave current pulse inverter for shallow TEM survey is described. It can generate a peak current more than 10A and the PRF of the bipolar current pulse is between 1Hz and 10kHz. The proposed inverter contains a high voltage source circuit for the rising edge and a Zener diodes circuit with constant voltage clamping for the falling edge. Measurement results are presented, which show the high quality triangular wave current pulse with linear rising edge and rapidly turnoff falling edge.

Sizing standalone battery charging systems based on Photovoltaic (PVTCP) Temperature Crossing Points using Voltage Source Photovoltaic Model (VSPVM)

Rural and semi-rural communities in third world countries harness solar energy mostly by using standalone Photovoltaic (PV) battery charging systems. Basic electronics circuits that do not include direct current to direct current (DC-DC) voltage converters are employed. These provide raw voltage levels from the solar PV modules that sometimes charge batteries insufficiently, leading to shorter battery lives. By modelling the solar PV module using a voltage source circuit representation, the effects of temperature on the PV module voltage could easily be illustrated to these rudimentary trained communities that deal mostly with voltage sources and not current sources. A Voltage Source PV Model (VSPVM) was developed from the well understood PV cell mathematical model. Microsoft Excel (MSE) was used as the data fitting environment and the PSpice environment was used to capture the electronic circuit topology proposed for the VSPVM. Validating the model against experimental data fitted maximum power points within 5% of the experimental data. Observations made on I-V characteristics plotted on the same graph showed interesting patterns of crossing points referred to here as Photovoltaic Temperature Crossing Points (PVTCP). A low temperature cluster and a high temperature cluster which were indicative of thresholds of some sort were observed. For hot climate regions, the power point voltage which exists between the two clusters could be considered as a guide to the possible range within which a PV battery charging system should operation.

バイアスオフセット型ＣＭＯＳ線形トランスコンダクタの高性能化

A transconductor is an important building block for analog signal processing circuits. A bias-offset transconductor is known as a linear MOS transconductor. Recently, transconductors are required to have linearity, low-voltage operation, and low power consumption. This paper presents a design of a transconductor based on a bias-offset transconductor for low-power operation with high linearity. The adaptively biasing technique is used to reduce wasteful operating current without reduction of the operating range. However, using adaptively biasing technique, the linearity of transconductance characteristic is deteriorated. Two MOSFETs operating as resistors are employed to improve the linearity. Moreover, high-precision floating voltage source circuit for low-voltage low-current operation is also presented. Simulation results show that the proposed techniques are effective to realize low-power and high-linearity transconductor.

Phase-domain power flows in the rectangular co-ordinates frame of reference including VSC-based FACTS controllers

This paper presents a method for systematic modelling of VSC-based FACTS controllers within three-phase power flows in rectangular co-ordinates. Among the FACTS controllers modelled are the STATCOM, SSSC, UPFC and HVDC-VSC. The approach taken is to represent the fundamental frequency operation of each power converter as a three-phase voltage source behind a leakage reactance, where one or two of them may be connected in either series or parallel depending on the FACTS controller being modelled. Active and reactive power flow equations are developed for each voltage source circuit together with constraint equations to account for co-ordinated operation of two converters, such as in modelling of UPFC and HVDC-VSC. The power flow equations representing the VSC-based FACTS controllers are combined with the nodal power equations of the power network for a combined iterative solution using a Newton–Raphson three-phase power flow algorithm in rectangular co-ordinates enabling robust and efficient solutions of three-phase power networks with any number and kind of VSC-based controllers.