High Frequency Switching Power Supply Research Articles

Gaussian process-based quasi-coherent noise suppression in magnetic confinement devices with superconductors

Gaussian process (GP)-based technique suppressing quasi-coherent noises, i.e. structured noises, is developed which is more effective than conventional denoising techniques such as using frequency-domain filters. Superconducting devices like KSTAR, EAST, JT-60SA and ITER require separate sets of normal conducting magnetic coils inside the tokamak vacuum vessels to achieve a prompt control of fusion-grade plasmas in response to various fast and abrupt plasma activities such as vertical displacement events. Hence, these in-vessel control coils are typically operated with high-frequency switching power supplies which generate quasi-coherent noises. Semi-conductor based bolometers in KSTAR, for instance, are vulnerable to the quasi-coherent noise that makes a tomographic reconstruction for the 2D poloidal radiation map with the noise-contaminated signals flawed. By modeling the quasi-coherent properties of the noise as multivariate Gaussian distribution and generating the kernel function for the GP solely based on the measurements, the proposed method is able to suppress the noise whose performance is superior to the conventional filtering schemes. The method not only suggests an estimate of the denoised signal but also informs the consistent (with the measurements) uncertainty of the estimate at a level smaller than the standard deviation of the quasi-coherent noise. Performance of the method is confirmed with synthetic data containing the quasi-coherent noises, and it is applied to the measured data obtained by the KSTAR bolometers.

Design and Implementation of Closed loop control for Flyback Converter

One of the high frequency switching power supply circuits is the flyback converter. Due to its inexpensive cost and electrical isolation properties, it is mostly employed in low power applications. It is well known that high frequency switching results in losses and lowers inverter efficiency, particularly at low powers. Consequently, a flyback DC-DC converter that is run in a closed control loop is explained in this study. Closed-loop control is the proposed topology for the flyback converter. For the same input/output conditions, the findings from the closed-loop converter are compared to those from the open-loop feedback topology. A closed-loop flyback has been found to be more effective than an open-loop flyback. MATLAB simulates the outcomes. One of the high frequency devices is the flyback converter.

Research on Electromagnetic Compatibility of High Frequency Switching Power Supply Based on Harmonic Balance Finite Element Method

With the rapid development of electronic technology, high frequency switching power supply has been widely used in various electrical equipment, and its electromagnetic interference has attracted more and more attention. In this paper, the harmonic balance finite element method is used to solve the electromagnetic compatibility of high frequency switching power supply. In this method, the coefficients of sine wave are applied to represent the waveform, and the solution is generated by linear synthesis. We propose to combine it with the finite element method to solve the steady-state response of electromagnetic field in frequency domain. It is proved the method we proposed is superior to the traditional time domain method.

Research on a Self-Coupling PID Control Strategy for a ZVS Phase-Shift Full-Bridge Converter

As an important part of the high-frequency switching power supply, the control accuracy of the phase-shift full-bridge converter directly affects the efficiency of the switching power supply. To improve the stability and antidisturbance ability of phase-shift control systems, this article presents a dual closed-loop control system based on Self-Coupling PID (SC-PID) control and applies the SC-PID control strategy to the voltage control of the phase-shift full-bridge converter. To begin with, in response to the contradiction of traditional PID, SC-PID breaks the limitation of PID control by introducing a new control idea instead of weighted summation of each gain, which fundamentally solves the contradiction between overshoot and rapidity. Then, using the dimension attributes between gains to develop new tuning rules to solve the system load disturbance, output voltage deviation from the reference value, and other problems, the purpose is to ensure the stability of the output voltage and improve the control effect. At the same time, the stability of the whole control system is analyzed in the complex frequency domain. Finally, with the same main circuit and parameters, three types of controllers are built separately, and using MATLAB for simulation comparison, the simulation results show that the control system based on SC-PID has better steady-state accuracy, faster response, and better robustness, which proves the feasibility of the SC-PID control idea.

Research and Design of an Intelligent Charging and Self-checking Car Charging Pile

This paper develops an intelligent, efficient, stable and reliable AC charging pile system. In order to achieve the goal of stability and reliability, the power supply uses a high-frequency switching power supply. The topology design must be reasonable. The power components selected can meet the working needs of the high-frequency switching power supply. In order to realize the automatic control function of the charging pile system and achieve the requirements of intelligence, the S3C44BOX embedded microprocessor is designed as the main controller of the charging pile system to realize various functions such as charging control and communication.

PFM and PWM Hybrid Mode Control Strategy for Switching Power Supply and Its Implementation

A PFM and PWM hybrid control strategy for high frequency switching power supply is designed in the article. Power supply working in heavy load mode uses PWM, and power supply at startup or working in light load mode uses PFM. The TIDM-PSFB-DCDC dc regulated power supply produced by TI company is used for experimental verification in hybrid control model. Programming by the STMS320F28335 chip goes on the hardware implementation of control strategy, and a detailed introduction and key statements of the procedure are given. Through the final experimental waveform, the power supply can work smoothly under the mixed control mode, and working conditions of heavy load and light load can be distinguished, and which improves the power supply’s working efficiency.

The Development of High-Current Power Supply System for Electrolytic Copper Foil

A 6.5 V/50 kA high-frequency switching power supply (HSPS) system composed of 10 power modules is developed to meet the requirements of copper-foil electrolysis. The power module is composed of a two-leg pulse width modulation (PWM) rectifier and a DC/DC converter. The DC/DC converter adopts two full-wave rectifiers in parallel to enhance the output. For the two-leg PWM rectifier, the ripple of the DC-link voltage is derived. A composite control method with a ripple filter is then proposed to effectively improve the performance of the rectifier. To meet the process demand of copper-foil electrolysis, the virtual impedance-based current-sharing control method with load current full feedforward is proposed for n-parallel DC/DC converters. The roles of load current feedforward and virtual impedance are analyzed, and the current-sharing control model of the HSPS system is derived. Virtual impedance is used to adjust the current-sharing impedance without changing the equivalent output impedance, which can effectively reduce current-sharing errors. Finally, simulation and experimental results verify the structure and control method.

Research on Coating Devices with Applied Technology in Magnetron Sputtering Regulated Switching Power Supply Design

Magnetron power supply is one of the most important components in coating devices in applied technology. Magnetron regulated power supply with high power and high efficiency is studied and designed on the basis of high-frequency switching power supply technology. The principle of the main circuit and control circuit design are introduced. A MATLAB simulating model is composed to study parameters and waveforms of the designed circuits. The hardware circuit and software program are designed based on simulation results. The adjustment and display of the output voltage and the output current of the power supply under different work modes are achieved with TMS320F2812 DSP system. Practical applications confirm that the designed power supply has good constant current control effect, high reliability and working stability.

The Design and Research of Active Clamp Forward Converter Based on IR1150

Nowadays, the development of Power Electronics is very quickly. High frequency switching power supply has been widely used in many fields because of its advantages, such as high efficiency, low volume and low cost etc. this paper focuses on the research of DC-DC transform technology in switching power supply. In the foundation of the traditional forward converter, an active clamp forward converter based on one-cycle control is designed. The control IC is IR1150 based on one cycle control technique. The results show that the converter can effectively eliminate the interference of power ripple and switch error. The control method is simple and reliable. The peripheral circuit is easy to realize.

Application of LiFePO4 Battery in Power System DC Equipment Maintenance

The DC power substation equipment is all energy infrastructure, once therere some problems with the DC equipment, which will make all the related equipment loses power, it will directly affect the safe operation of the substation. This article discusses some shortcomings of the original lead-acid batteries for emergency DC power, demonstrated high frequency switching power supply with the combination used of LiFePO4 iron group of science, along with a brief description of the features and benefits of their work.

The Design of 5V/100W High Frequency Switching Power Supply

Switching power supply is an important field of application of power electronic technology, the high frequency switching DC power supply with high efficiency, small size, light weight and other advantages obtain the widespread application. The application of synchronous rectifier technology, photoelectric coupling isolation technology and the active clamp forward converter design high frequency switching power supply with 16~40V DC input and 5V/100W DC output . its operational principle is analyzed, and using LM5026 control chip describes design method of switching power supply.

Research on High Frequency and High Voltage Switching Power Supply for Electrostatic Precipitator

Electrostatic precipitator is the efficient dust removal equipment for environmental protection. As the core part, high voltage inverter power supply determines the efficiency and effect of dust removal. This paper design a high frequency and high voltage switching power supply for electrostatic precipitator based on FPGA. The power supply system is composed of rectifier and filter circuit, high frequency inverter circuit, step-up transformer and high voltage rectifier silicon reactor circuit. Using IRFP460N as power switches, single-phase full-bridge inverter was set up. The SPWM signals produced by FPGA EP2C5T144C8 were isolated and amplified through drive circuit IR2110. The function of variable frequency and voltage was realized. Hardware test showed the whole system operated safely and reliably.

Technical Design of Arc-Discharge and Deceleration Power Supply for MW Level NBI System on HL-2A Tokamak

Neutral beam injection (NBI) is one of the most effective ways to heat and drive plasma in a tokamak. The mega watt level neutral beam injector on the HL-2A tokamak consists of four high-power ion sources. Each source is supplied by discharge, beam extraction and auxiliary power supplies. Some circuit topologies and control sequences designed for the system are presented in this paper. Some important technologies such as the notching circuit, insulated gate bipolar transistor (IGBT) series-connected switch, high-frequency switching power supply and control system based on a digital signal processor (DSP) have been used. The system can be effectively used for high current ion beam extraction, protection, ion optics and so on. The power system has been safely used in HL-2A high-parameter NBI experiments for three years. The power of NBI can be kept at higher than 0.75 MW for 1 second and the ion beam power extracted from the ion source is higher than 2 MW. The ion temperature of the plasma center is close to 2.0 keV. These results show that the design of this power system is reasonable and reliable, and it can fully meet the system requirements for NBI of the HL-2A tokamak.

Densification, Grain Growth and Microstructure of Ni-Zn Ferrites

Nio 0.65 Zn 0.35 Fe 2 O 4 , with high density and fine grain size, is a desirable composition for applications of high frequency switching power supplies. This composition has been studied under different sintering conditions. Observed changes in density, grain size and microstructure in these ferrites have been correlated to the volatilization of zinc from the samples at elevated sintering temperatures. Densification and grain growth are observed to be Arrhenius controlled rate processes with activation energies of 63.9 and 64.4 Kcal/mole respectively.

Application of harmonic balance-finite element method (HBFEM) in the design of switching power supplies

Numerical modeling and analysis are effective techniques to assist in the design of high-frequency switching power supplies. Striving for high power densities and higher efficiencies has pushed the operating frequencies up, resulting in new circuit configurations and different component architecture. This paper presents a numerical method that is used to analyze magnetic systems for switching power supplies, in particular the switching resonant DC-DC converters. The method uses the harmonic balance technique combined with finite element methods and is referred to as the harmonic balance-finite element method (HBFEM). The HBFEM is used to solve various harmonic, eddy-current, hysteresis, and nonlinear problems applied to magnetic circuits used in switching power supplies. To evaluate the numerical results, comparisons are made with experimental results.

フィルム変圧器の基礎的考察

In order to realize light and small power supplies, this paper proposes a film-shape transformer called film transformer. The basic operating principle of this transformer is the skin effect similar to those of the coreless transformer previously exploited by the authors. Both the primary and secondary coils composed of thin-film conductors are arranged coaxially on the one-layer film base, and the film transformer is constructed by the lamination of these films. In this paper, experimental as well as numerical studies are carried out about basic characteristics of the film transformer in order to examine possibilities in practical use. As a result, it is shown that the film transformer may be applicable to high-frequency switching power supplies.

New power supply method for soft magnetic material characterization at high flux density values

A novel power supply is proposed to improve the characterization of soft magnetic materials at high flux density. The power supply consists of a high-frequency switching power supply (PWM inverter) with a voltage regulator to control the distortion of the electromotive force induced in the device under test (Epstein yoke, wound, core, etc.). Experimental results confirm the good features of the proposed solution for flux density values up to 1.9-2.1 T.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Effects of gamma-ray irradiation on thin-gate-oxide VDMOSFET characteristics

Effects of gamma-ray irradiation on thin-gate-oxide VDMOSFET characteristics are described. The gate-oxide thickness of the device is 34 nm. The device has a radiation tolerance of 2*10/sup 5/ rad, which is four times higher than that of 100-nm gate-oxide device. Although the thin gate oxide increases input capacitance, reverse transfer capacitance is reduced by using the VDMOSFET cell structure with an additional p region. The VDMOSFET is suitable as a switching device for high-frequency switching power supplies used in communication satellites. >