Multi-unit diode capacitor network and coupling inductor high-gain DC converter

Abstract

The invention discloses a multi-unit diode capacitor network and coupling inductor high-gain DC converter. The main circuit topology fully combines the characteristics of a multi-winding coupling inductor and a diode capacitor boost network, and the converter has the following remarkable advantages: 1), improving the voltage gain, and reducing the voltage stress of a power device; 2), achieving zero output voltage ripple, and remarkably reducing the demands of an LC filter; 3), reducing the turn ratio of a coupling resistor, reducing the size of a magnetic element, and improving the power density; 4), inhibiting the turn-off voltage peak of a switching tube, reducing the switching loss, and improving the electric energy conversion efficiency; 5), achieving the modular design of a basic boost unit, and achieving high flexibility. The converter is good in application prospect in a new energy distributed power generation system.

Description

【Technical field】 [0001] The invention belongs to the field of distributed power generation such as new energy photovoltaics and fuel cells, and relates to a high-gain DC conversion technology, in particular to a multi-unit diode capacitor network and a coupled inductor high-gain DC converter. 【Background technique】 [0002] The development and utilization of green energy such as solar energy and fuel cells has important strategic significance for optimizing my country's energy structure and achieving sustainable economic and environmental development. Different from traditional DC power sources, such as DC generators and storage batteries, photovoltaics and fuel cells have the characteristics of low output voltage and obvious voltage drop. One of the many technical bottlenecks in the system. [0003] Typical photovoltaic and fuel cell power generation systems are divided into two types: single-stage and two-stage. The single-stage structure inverter (DC-AC) only undergoes...

AI Technical Summary

Problems solved by technology

However, due to the influence of parasitic parameters in the inductance loop of the main circuit and the performance of the controller, even if the duty cycle reaches the limit state close to 1, it is difficult to have a high voltage gain

The diode conducts in a very short time and bears relatively large voltage and current stress, which will inevitably lead to serious switching loss and EMI problems

figure 1 (b) is a multi-unit diode-capacitor network high-gain DC converter. When S=ON, the two capacitors in unit 1 are connected in series to charge the two capacitors in unit 2, and multiple capacitors with voltage source characteristics directly pass through the power The short-circuit charging and discharging process of the semiconductor device produces a huge inrush current, which increases the loss of the device

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