Abstract
Electric vehicle batteries have the problem of low output voltage, so the application of a high-gain converter is a research hotspot. The symmetrical dual-switch high gain converter has the merits of simple structure, low voltage and current stress, and low EMI. Due to the deterioration of circuit performance caused by circuit parasitic parameters under high frequency operating conditions, the former analysis under low frequency condition cannot satisfy the requirements for performance evaluation. To clarify whether the symmetrical dual-switch high-gain converter can maintain its operating characteristics under high-frequency operating conditions, this paper establishes the converter model considering parasitic parameters, and deduces the sneak circuit modes at high frequency. The effects of parasitic parameters at high frequency on voltage gain, switch stress, and symmetrical operating are analyzed, which is beneficial for the selection and optimization of power devices. This paper believes that considering parasitic parameters may reduce the output gain of the symmetrical double-switch high-gain converter considering parasitic parameters under high frequency conditions, increase the switching stress, and affect the symmetry of the circuit operation when the parasitic parameter values are different. Finally, an experimental platform rated on 200 W with 200 kHz switching frequency is established, and experimental verification is given to verify the analysis.
Highlights
IntroductionWith the increasingly serious problems of environmental pollution and energy crisis, the new energy vehicle battery has gradually become a research hotspot in the field of new energy vehicles [1]
With the increasingly serious problems of environmental pollution and energy crisis, the new energy vehicle battery has gradually become a research hotspot in the field of new energy vehicles [1].The new energy vehicle battery refers to a kind of power source that provides driving power source for electric vehicles, electric trains, electric bicycles, and other transportation tools
A model analyzes the characteristics of the high-frequency down-converter considering the parasitic of the symmetrical dual-switch high-gain converter considering parasitic parameters is established, parameters
Summary
With the increasingly serious problems of environmental pollution and energy crisis, the new energy vehicle battery has gradually become a research hotspot in the field of new energy vehicles [1]. Investigations into the effect of parasitic components under high frequency conditions can be summarized as the switching performances of MOSFET (metal-oxide-semiconductor field-effect transistor), switching loss, electromagnetic interference problems, the line current total harmonic distortion of Boost PFC (power factor correction) converter, and the voltage gain of the converter [10,11,12,13,14]. Refer to the analysis content and analysis ideas of the above documents, this paper analyzes the sneak circuit and operating characteristics of the symmetrical dual-switch high gain converter considering parasitic parameters at high frequencies. The effects of parasitic parameters at high frequency on voltage gain, switch stress, and symmetrical operating are analyzed, which is beneficial for the selection and optimization of power devices.
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