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This paper presents a new low-cost digital control solution that maximizes the AC/DC flyback power supply efficiency. This intelligent digital approach achieves the combined benefits of high performance, low cost and high reliability in a single controller. It introduces unique multiple PWM and PFM operational modes adaptively based on the power supply load changes. While the multi-mode PWM/PFM control...
In this study, a high power zero-voltages-witching flyback power supply is presented. An appropriate efficiency is achieved by designing an auxiliary circuit for reduction of dynamic losses in the power switch. Due to the importance of reliability in the switch mode power supplies, reliability assessment is discussed for this zero-voltage-switching flyback converter in details. This paper illustrates...
Reliability plays an important role in power electronic systems by which the number of system failures, repair costs, guarantee and etc are estimated. In this paper first, a boost power factor correction (PFC) converter is simulated in discontinues conduction mode (DCM) and continuous conduction mode (CCM) under different output power ratings. For these simulations, all of the inherent parameters...
Design an electrical locomotive 110 V D.C. source with PFC based on the structure of two-stage switching converter. Discuss the design scheme of main circuit and control circuit. Expound the calculation method of the key parameters. The experiments indicate that the device gets good performance on output and reliability. The electric source is appropriate for electrical locomotive and the other similar...
Today reliability is one of the serious requirements of electronic systems, and, using that, the number of system failures, repair cost, guarantee, etc are estimated by this factor. In this paper, the reliability of a switching power supply (SMPS) is evaluated and the effect of the type of transformer winding on the reliability is fully discoursed. It is proven that the interleaved winding will increase...
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