Research On Coupled Inductor Switcher Modeling Method Based On Pwm Type High-voltage-conversion Ratio DC-DC Converter

High conversion ratio DC-DC converters were often employed in renewable energy applications.High performance,such as soft switching,low input current ripple and high effiencicy,were often required which result in more complicated topologies.It brings challenges to modeling analysis.According to the investigation,the dynamic modeling process of this deformed structure has a similar deduction process,that is,based on the basic topological unit model,it can be easily deduced based on the structural law to obtain a complex high-order topology model.Based on this idea,this paper is based on the Tapped Inductance Switcher modeling method(TIS).On the one hand,starting from complex highorder topology modeling,a general ETIS module is proposed.It is more suitable for highorder converter modeling.On the other hand,the original TIS modeling method based on continuous conduction mode(CCM)is extended to discontinuous conduction mode(DCM).And solve the modeling problem considering leakage inductance and soft-switching circuit.The specific research content is as follows:1)To modeling high-order converter,the ETIS modeling method is proposed.By pulling out the internal terminals of the TIS module,the degree of freedom in applying to different topologies is improved.On this basis,the non-ideal large-signal model,steady-state model and small-signal model of the ETIS module in CCM mode are derived.A large number of application examples illustrate the implementation method of this general modeling method.Finally,simulations and experiments verify the correctness,convenience,and wide applicability of the proposed ETIS modeling method.2)A non-ideal improve general modeling method based on TIS module in DCM mode is proposed.The accuracy of the traditional first-order DCM model is less than 1/5 of the switching frequency.Based on the the TIS modeling method,the frequency band width of the non-ideal improve DCM model derived above can reach 3/5 the switching frequency,which improves the modeling accuracy.3)A general modeling method based on TIS module with leakage inductance and softswitching circuit.High-voltage-conversion ratio converters often use transformers and coupled inductors,and their leakage inductance and soft-switching circuit are difficult points for modeling and analyzing converters.This paper introduces the clamping circuit branch inside the TIS module,and derives the non-ideal large-signal model,steady-state model,and small-signal model of the TIS module with leakage inductance and clamp terminals.Combined with practical application cases,simulations and experiments verify that the proposed general modeling method can accurately model at 2/3 switching frequency,and proves the correctness and validity of the theoretical analysis.This research enriches the technical means of dynamic modeling of PWM DC converters.The proposed general modeling method can reduce the workload of formula derivation in the modeling process and improve the modeling accuracy.Relevant theoretical analysis has carried out simulation and experimental demonstration by combining a large number of application examples,which has reference value for related research work.