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This paper presents the synthetic design of the transformer in flyback switching AC-DC converters. Firstly, the maximal power transferred by a standard size magnetic core such as EE-20 or EE-25 is theoretically determined. To obtain accurate analysis, a method based on the nonlinear finite element analysis (FEA) of electromagnetic field is employed. Secondly, from the view of reducing the maximal...
This paper analyzes the maximal power loss in the output diode of flyback switching converter operating in both continuous conducting mode (CCM) and discontinuous conducting mode (DCM). Comparing with the previous work, this paper extends the condition, under which the maximal power loss of the output diode occurs, from the CCM to the DCM. Three correlative tasks are included. Firstly, through an...
This paper presents a general method for deciding the input filter capacitance of flyback switching ac- dc converters with peak current-controlled mode. Firstly, a simulation model for flyback ac-dc converter is obtained by adding the rectifier and filter circuit to a flyback dc-dc converter model developed by the authors. The simulation results show that the processes of capacitor charging and discharging...
This paper presents the simulation model of flyback switching DC-DC converters operating in heavy load modes, and the application of the model in the converter design for improving the system reliability. To derive the simulation model, different operational modes and atomic circuit blocks (ACB) are established first. Then, the state-machine of the system is studied. Finally, the transfer function...
This paper presents a unified hybrid model with two level networks for peak current mode controlled buck-boost converters operating in continuous conduction mode (CCM) and discontinuous conduction mode (DCM). It is a network model with two levels in which both a detailed switching model and a small signal average model are included correspondingly. The nonlinearity of some electronic components and...
This paper presents a 2-D nonlinear finite element analysis (FEA) tool embedded in Matlab/Simulink surrounding for the application of electromagnetic field analysis in power converters. Comparing with other FEA tools such as ANSYS and ANSOFT, as different control arithmetic has been realized in Matlab/Simulink surrounding, the significant advance by using the FEA tool embedded in Matlab/Simulink surrounding...
This paper presents a general method for designing the transformer of flyback switching AC-DC converters based on nonlinear finite element analysis (FEA) of electromagnetic field coupled with external circuit. For that, the variation patterns of the PWM duty ratio and the current flowing through the windings of transformer versus the input voltage are introduced first, and then several important principles...
Based on the mathematical model of flyback switching DC-DC converter in the continuous current mode and the simulation model under heavy loads, this paper presents a study of the steady-state power loss in the output diode, including the loss calculation models under three operational modes (voltage control, under-voltage, and over-current modes), the relations of the diode loss versus the input and...
Based on the mathematical model of flyback switching DC-DC converter in the continuous current mode and the simulation model under heavy loads, this paper presents a study of the steady-state power loss in the output diode, including the loss calculation models under three operational modes (voltage control, under-voltage, and over-current modes), the relations of the diode loss versus the input and...
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