Active network boost converter

Abstract

The invention relates to an active network boost converter, and belongs to the technical field of power converters. The active network boost converter comprises an X type active network and an output filter circuit which are sequentially connected. The X type active network comprises two groups of inductors and power switch tubes in parallel connection, and the two power switch tubes are placed in an X type. According to the active network boost converter, the chosen inductors are small in current, small in induction value and small in size, therefore the size and the weight of the boost converter are reduced, and meanwhile the power switch tubes with small duty ratios are utilized to achieve boost conversion in high conversion efficiency.

Description

technical field [0001] The invention relates to an active network boost converter and belongs to the technical field of power electronic converters. Background technique [0002] Boost converters are widely used in industrial fields, such as battery charge and discharge managers, new energy power generation, motor drives and other occasions. The traditional boost converter circuit topology is Boost circuit. The Boost circuit has a simple structure and is widely used, but it also has the following defects: (1) When a large boost ratio is required, the duty cycle is large, so the energy transfer mode takes a small amount of time, resulting in reduced efficiency; ( 2) The required boost inductance is large, the entire input current flows through the inductor, and the inductor current value is the input current value. At the same time, due to the large duty cycle and the long energy storage time of the inductor, the inductor current ripple is large, so the inductor's Large vol...

AI Technical Summary

Problems solved by technology

The Boost circuit has a simple structure and is widely used, but it also has the following defects: (1) When a large boost ratio is required, the duty cycle is large, so the energy transfer mode takes a small amount of time, resulting in reduced efficiency; ( 2) The required boost inductance is large, the entire input current flows through the inductor, and the inductor current value is the input current value. At the same time, due to the large duty cycle and the long energy storage time of the inductor, the inductor current ripple is large, so the inductor's Large volume and weight; (3) The voltage stress of the switch tube is relatively high, which is the power supply voltage, and a power switch tube with higher voltage stress must be selected. (4) When the power switch and the power diode are turned on, the entire inductor current flows, that is, the input current flows, and its on-state loss is large and the efficiency is low; (5) Due to the large duty ratio of the work, the output The current ripple is large, and a large output filter capacitor needs to be selected, which increases the volume, weight and cost of the system

Images