Switching Power Supply Design Research Articles

Design and evaluation of low-power switching power supplies using a zero-voltage boost converter with a snubber circuit

Design and evaluation of low-power switching power supplies using a zero-voltage boost converter with a snubber circuit

Design of a Takagi–Sugeno Fuzzy Exact Modeling of a Buck–Boost Converter

DC–DC converters are used in many power electronics applications, such as switching power supply design, photovoltaic, power management systems, and electric and hybrid vehicles. Traditionally, DC–DC converters are linearly modeled using a typical operating point for their control design. Some recent works use nonlinear models for DC–DC converters, due to the inherent nonlinearity of the switching process. In this sense, a standout modeling technique is the Takagi–Sugeno fuzzy exact method due to its ability to represent nonlinear systems over the entire operating range. It is more faithful to system behavior modeling, and allows a nonlinear closed-loop control design. The use of nonlinear models allows the testing of controllers obtained by linear methods to operate outside their linearization point, corroborating with robust controllers for specific applications. This work aims to perform the exact fuzzy Takagi–Sugeno modeling of a buck–boost converter with non-ideal components, and to design a discrete proportional–integral–derivative (PID) controller from the pole cancellation technique, obtained linearly, to test the controller at different operating points. The PID control ensured a satisfactory result compared with the stationary value of the different operating points, but it did not reach the desired transient response. Since the proposed model closely represents the operation of the buck–boost converter by considering the components’ non-idealities, other control techniques that consider the system’s nonlinearities can be applied and optimized later.

Fault logic circuit design of switching power supply based on soft reference circuit module

The basic idea of the circuit fault diagnosis method based on fault logic is to establish a computer expert database system first, connect the computer to the GPIB interface card, and then connect each intelligent instrument through the GPIB standard bus. Through the connection of the tested object adapter and the tested object, a circuit fault expert diagnosis and test platform are formed. Based on the traditional fault simulation model, this paper improves the fault logic circuit of switching power supply, designs the system model of fault simulation, deals with the logic structure and circuit hierarchy respectively, and produces the final output through the logic gate circuit by comparing the results of the fault logic circuit and the fault-free logic circuit. The designed switching power supply fault logic circuit works in the switching state, which has the characteristics of low loss and high energy conversion efficiency. Through the simulation analysis, the output is connected to the comparator, which plays the role of the whole wave. The simulation results are in line with the parameter indicators. The functional test results of the chip show that the function of the module is basically normal, which has practical application value and good portability and can be used as a reference for similar electrical designs.

A Case Study of a Small Switching Power Supply Process: Based on the Module of Production

With the rapid development of electronic products, technology plays an important role in the management and production of electronic products. In the increasingly fierce market competition, excellent technological process is also one of the important bargaining chips for the success of an enterprise, and it is the embodiment of the level of enterprise management ability. As a product of modern power electronic technology, switching power supply represents the development direction of regulated power supply, and it is an industry pursued by many electronic companies. Switching power supply manufacturers should not only pay attention to the miniaturized power module technology, but also do a good job in the quality management of the production process. Only by doing a good job in the production process design, can better ensure the function and quality of the miniaturized switching power supply module, and help enterprises gain an advantage in the market competition. Using the method of case study, this article interviewed the small switching power supply design engineers and production workshop workers in Factory A. combined with literature analysis and on-site observation, it is proposed that the production process of switching power supply module should involve three stages: before production, during production, and after production, which include 8 links: production preparation, coil production, the device welding assembly, cleaning, inspection, potting, sealing and marking. In particular, the requirements and precautions of each step are described in detail.

Optimization of key power loss for LLC circuits with planar transformer in high-frequency and high-power scenarios

An accurate power loss model, for the design of high-efficiency switching power supplies, is difficult to establish due to the complicated magnetic components where the power loss is hard to calculate. This paper proposed a multi-level power loss model of LLC circuits with a planar transformer of high frequency, high power, and low voltage output. The key loss items can be optimized by using this loss model, the accuracy of which and the feasibility of the optimization method are validated by extensive prototype experiments. The experimental results show that the average accuracy of the loss calculation is about 93.6%, and the high efficiency at high-power conversion (95.9% @ 3 kW, 224–16 V) has been realized using an optimized prototype converter.

The Design of AC-DC Converter Based on Double Closed Loop PFC

Based on the requirements of switching power supply design and application, this paper proposes a PFC AC-DC voltage stabilized power supply with two closed loops of current and voltage as the core. The modeling and analysis results show that the power factor is over 99% and the output DC voltage has high stability. The circuit has certain application and popularization value.

Design of a flyback high-efficiency switching power supply

Switching power supplies are widely used in automotive, aviation, and DC speed control fields. Its biggest requirement is stable output and high efficiency. It is usually realized by resonant converters, but its control circuit is complex and the output ripple is large. In this paper, a new type of flyback switching power supply is designed using a flyback conversion circuit and a single-tube self-excited conversion circuit. Experiments have shown that the designed switching power supply improves the efficiency and reliability of the power supply while obtaining a small ripple, continuously adjustable, and stable DC voltage.

Design of high efficiency dc switching power supply based on soft switch

At present, due to the small size, high power density, high efficiency, a variety of switching power supply is getting more and more widely used. With the improvement of automation degree of power system, especially the microcomputer of protection device, the program control of communication device and the requirement of power efficiency are also increasing. In order to solve the problem of high power consumption and unstable output of linear circuit in the process of energy conversion, this paper proposes a stable switching power supply based on SG3525 control. The constant voltage source USES PWM control principle to control the duty ratio of the switch tube to achieve the output voltage of 24V. Since the switch power supply design is usually based on the ideal state of the device, SABER simulation software is used to verify the feasibility of the circuit. At the same time, through physical verification, the circuit performance when the input voltage fluctuates. And test the load capacity and work efficiency of the circuit.

Design of Adjustable Switching Power Supply with Current Type Single-Ended Flyback Output

This study is based on the UC3845 controller, designed a flyback switching power supply, which has a wide input voltage range, high output voltage accuracy, and high load regulation. According to the characteristics of flyback switching power supply and UC3845, adding filter circuit, a feedback circuit, protection circuit, etc., develop a single-ended flyback switching power supply with adjustable output, stable and reliable, and high efficiency. According to the simulation results, it can be seen that the designed switching power supply has high output voltage accuracy, and the input voltage in the range of 200V∼240V, the accuracy of the output voltage is kept within 1.3%; the voltage adjustment is less than 1%, The output ripple factor is kept below 0.09%, and the output voltage is adjustable.

Analysis of Power Categories Problems in National Undergraduate Electronic Design Contest

This article describes the power categories problems that often appear in National Undergraduate Electronic Design Contest, and gives a switching power supply design and power performance test results. Finally, the article summarizes the knowledge of power categories problems involved as well as the contents participants to master.

Design of a Flyback Switching Power for Smart Meter

With switching power supply being widely used in Smart Meter, there exists more restrictions on the performance of it. This paper designs a single-ended flyback switching power supply based on LNK364DN chips which is used in intelligent single-phase table, Compares the advantages and disadvantages of the switching power supply and the traditional linear regulated power supply, and introduces the reaction type switching power supply design principle and working process. In order to satisfy the security requirements, this paper also designs the EMI suppression circuit, surge suppression current, clamp circuit, etc. The design process, including the maximum duty cycle including transformer, the primary inductance calculation, etc, of the flyback type switch power supply transformer is introduced in detail. The experimental results show that the switch regulated power supply has small volume, good electromagnetic compatibility, small ripple, low power consumption, high efficiency of AC/DC transform and excellent performance .

Design of Switch Transformer about Half Bridge Switching Power Supply

Half bridge switching power supply is a kind of form in the family. It has the characteristics of good voltage output, high efficiency, the simple circuit and so on. On the design of the half bridge switching power supply, the key and difficult point is the design of switch transformer. Taking the switch transformer of a half bridge switching power supply as the research object and based on the design requirements, this paper aims to realize the calculation of the coil turns and the selection of core in switching transformer. the design of switch transformer of the push-pull switch power supply has been completed by circuit simulation and implementation.

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.

Single-Ended Forward Switching Power Supply Design Based on UCC2800 PWM Controller

Switching Power Supply which has a lot of advantages compared with Linear Power Supply is used very widely in the modern life. This paper discussed a kind of DC/DC switching power supply based on the UCC2800 PWM controller chip, the basic technical indicators is DC 28V rated input voltage ranging from 16V to 40V, 5V30W output, and analyzed its working principle、soft start and short-circuit protection, finally, briefly described switching power supply design methods in the use of UCC2800 PWM controller chip.

FPGA-Based High Precision and Low EMI Switching Power Supply Design

We analyze the reasons why DC-DC switching power supply generates the electromagnetic interference (EMI), and through the FPGA control the digital-to-analog converter (DAC) to output the pulse width modulation (PWM) signal with high precision and slew rate controlled, the slew rates of the voltage and current of external N-channel MOSFET are controlled. So, dv/dt and di/dt can be decreased in the circuit; and the ripple noise and EMI of switching power supply are reduced vastly in this way. Experimental results show that the ripple noise of switching power supply could be reduced by 80% and EMI reduced 15dBμV. The experiment has proved that we can cut down the ripple noise and EMI of switching power supply by lessening the slew rates of the voltage and current of MOSFET switching tube.

Multiple Output Single-Ended Flyback DC-DC Switching Power Supply Design

The paper described selection principle of the device, carried out a detailed analysis and the design of the diagram of the high-frequency transformer. At the same time, the PCB layout design was put forward. Experimental results show that the power supply would still be able to output stable DC in the case of grid voltage fluctuation and larger load disturbance, had the characteristic of good stability and high precision, all parameters can meet the system requirements.

Design of a new switching power supply for the ATLAS TileCAL front-end electronics

We present the design of an upgraded switching power supply for the front-end electronics of the ATLAS hadron tile calorimeter (TileCAL) at the LHC. The new design features significant improvement in noise, improved fault detection, and improved reliability, while retaining the compact size, water-cooling, output control, and monitoring features. We discuss the steps taken to improve the design. We present the results from extensive radiation testing to qualify the design, including sensitivity to Single Event Upset. We also present our reliability analysis. Production of 2400 new bricks for the detector is currently in progress, and we present preliminary results from the production checkout.

Flyback Transformer Optimum Design and Simulation

In the design of low-power mode switching power supply, reducing power loss so as to improve the efficiency of power supply is one of the most important goals, and the flyback transformer design is particularly critical. In this paper, the author optimized the design of the flyback transformer and made a theoretical calculation, and obtained a set of optimized design parameters. Then the author confirmed the effectiveness of optimization through SABER simulation. The results show that power loss has been markedly reduced after optimization.

Fuzzy logic design of self-tuning switching power supply

This paper presents the design of a variable-voltage DC source using proportional and integral (PI)-like fuzzy logic controller (FLC). Three types of topology (buck converter, boost converter, and buck-boost converter) are used to step down, step up, and negate the input voltage. The output voltage of the proposed scheme can be adjusted automatically according to the pre-set reference DC voltage. PC implementation of the controller offers great flexibility in both the design and maintenance phases. Both simulations and experimental results are provided to verify the theoretical analysis through an experimental prototype of the proposed controller. The closed-loop performance of simple variable-voltage DC source is investigated for buck, boost and buck-boost converters in respect to load regulation and line regulation. The controller shows very interesting tracking features and is able to cope with load changes and input voltage variations. The proposed controller structure is general and can be directly applied to any DC–DC converter topologies.

817 スイッチング電源設計における熱流体シミュレーションの適用 : プリント基板上部品温度の解析

817 スイッチング電源設計における熱流体シミュレーションの適用 : プリント基板上部品温度の解析