Multiloop interleaved control for three-level buck converter in solar charging applications

Abstract

In this paper, a nonisolated three-level (TL) buck converter is used for high voltage high power solar charging application. In order to search the maximum power point tracking (MPPT) point, keep the capacitor voltage balance and realize the function of constant current (CC) and constant voltage (CV) charging, a multiloop interleaved control (MIC) method is proposed. The proposed TL buck battery charger and the MIC method have the advantage of lower inductor current ripple, lower switch withstanding voltage and lower switching loss compared with the conventional buck charger. The proposed MIC method is digitally implemented by a digital-signal-processor (DSP)-based system. Simulation and experimental results based on a 4000 W prototype circuit are presented to demonstrate the effectiveness of the proposed control method.

A series-connected asymmetrical PWM half-bridge three-level converter with reduced circulating current

“…1. The voltage stresses of the switches in the primary side are clamped to the half of input voltage [1][2][3][4][5]. However, there are also some drawbacks in the traditional TL converter.…”

A Fast and Simple Fault Diagnosis Method for Interleaved DC-DC Converters Based on Output Voltage Analysis

“…In recent years, interleaved DC-DC converters have been widely used in household appliances, industrial equipment, and national defense construction, among others [1,2]. Interleaved DC-DC converters can effectively reduce the amplitude of the total current ripple, increase the ripple frequency of the output current, and improve the ability to control high currents [3][4][5][6][7]. Within DC-DC converters, the power switch works at very high switching frequencies.…”

A new transition regulation method for circuit balance enhancements of three-level DC-DC converters

“…In recent years, isolated three-level converters are attractive candidates in small-scale or residential DC grids applications because of the low voltage stress on active switches [1,2,3,4,5,6]. With the lower-rated voltage, the three-level converter can utilize semiconductor components that obtaining lower equivalent turn-on resistance, parasitic parameters, and switching characteristics [7,8,9,10,11,12,13,14,15,16]. Therefore, previous researches are dedicated to making topological simplification and control method improvement for better performance including higher conversion efficiency and practicality [17,18,19,20].…”