Effect Of Transformer Leakage Inductance Research Articles

The Influence of Transformer Leakage Inductance and Distributed Capacitance Parameter on the Output of Switch Power Supply

Transformer is an important component of switch power supply system, the distribution parameters of the transformer affects the performance of switching power supply. This paper analyzes the simulation of transformer parameters, studies the effects of transformer leakage inductance and distributed capacitance ,and calculate it by using numerical analysis method. To ensure reliability of switch power supply , 2D modeling is used for the simulation of transformer in Ansoft Maxwell.

The Effect of Transformer Leakage Inductance on the Steady State Performance of Push-pull based Converter with Continuous Current

As a result of the advantages such as high efficiency, continuous current and high stability margin, push-pull converter with continuous current (PPCWCC) is competitive for battery discharge regulator (BDR) which plays an important role in power conditioning unit (PCU). Leakage inductance yields current spike in low-ripple current of PPCWCCs. The operating modes are added due to leakage inductance. Therefore the steady state performance is affected, which is embodied in the spike of low-ripple current. PPCWCCs which are suitable for BDR can be separated into three types by current spike characteristics. Three representative topologies IIs1, IIcb2 and Is3 are analyzed in order to investigate the factors on the magnitude and duration of spike. Equivalent current sampling method (ECSM) which eliminates the sampling time delay and achieves excellent dynamic performance is adopted to prevent the spike disturbance on current sampling. However, ECSM reduces the sampling accuracy and telemetry accuracy due to neglecting the spike. In this paper, ECSM used in PPCWCCs is summarized. The current sampling error is analyzed in quality and quantity, which provides the foundation for offsetting and enhancing the telemetry accuracy. Finally, current sampling error rate of three topologies is compared by experiment results, which verify the theoretical analysis.

Effect of Transformer's Parameters on Harmonic Generation

Recently, switching power supplies are used in almost all electronic devices to convert and regulate the voltage amplitude. The only obstacle on using these devices is the production of high frequency harmonics that violates different standards such as (FCC, VDE, 461). In this paper the sources of various noises in switching power supplies will be introduced. Then, using appropriate model for high frequency transformers, a sample switching power supply will be simulated. In this simulation, the effect of transformer leakage inductance on current and voltage waveforms of the input and output switches, which are the main cause of common and differential mode noises and radiations, will be discussed and harmonically analyzed. Finally the experimental results are given to confirm the simulation conclusions.

Harmonic analysis of a high frequency square wave cycloconvertor system

The paper introduces an unusual form of DC-to-AC convertor using an unregulated inverter, which is transformer coupled to a high frequency cycloconvertor. It gives a brief description of a prototype system and presents some practical waveforms. The main content of the paper is devoted to the development of a modulation law for the square wave cycloconvertor, which is done by comparison with conventional cycloconvertor techniques, and the analysis of the harmonic content of the resulting output waveforms. Comparison is made between the spectra produced by the cycloconvertors and a conventional inverter with sinusoidal pulsewidth modulation. The effects of transformer leakage inductance on the thyristor commutation process is discussed, and the modification made to the output waveform by overlap is identified and analysed; it is found to be small with low-leakage bifilar wound transformers. The effect of source frequency on the transformer leakage inductance is estimated, and it is shown that higher frequency systems are feasible without overlap causing any undue problems.