Hybrid quasi Z source converter employing transformer

Abstract

The invention provides a hybrid quasi Z source converter employing transformer. The converter comprises a direct-current input power supply, the transformer (T) with the turn ratio of 1 to n, a first diode (D1), a first capacitor (C1), a second capacitor (C2), a first inductor (L1), a third capacitor (C3), a second diode (D2), a fourth capacitor (C4), a second inductor (L2), a switch tube (S), a third diode (D3), an output capacitor (Cout) and a load. Compared with a flyback converter, a quasi Z source converter and the like, the hybrid quasi Z source converter provided by the invention has a higher voltage gain, and is suitable for the occasion of non-isolating high-gain direct-current voltage conversion.

Description

technical field [0001] The invention relates to the field of DC / DC converters, in particular to a hybrid quasi-Z source converter using a transformer. Background technique [0002] In new energy power generation systems, fuel cells have attracted the attention of many researchers because of their extremely high power generation efficiency and power density, low noise, and continuous work. In view of the disadvantages of low output voltage, wide range, and slow dynamic response of the fuel cell, it is necessary to add a DC / DC converter between the fuel cell and the load to output stable high-voltage direct current. However, many step-up DC / DC converters are limited by the duty cycle, parasitic parameters and losses, and cannot achieve a large boost. For example, the flyback converter has a voltage gain of nD / (1-D), where n is the transformer Turn ratio, D is the duty cycle, but due to the influence of parasitic parameters, its gain is limited; another example is the quasi-Z ...

AI Technical Summary

Problems solved by technology

In view of the disadvantages of low output voltage, wide range, and slow dynamic response of the fuel cell, it is necessary to add a DC / DC converter between the fuel cell and the load to output stable high-voltage direct current

However, many step-up DC / DC converters are limited by the duty cycle, parasitic parameters and losses, and cannot achieve a large boost. For example, the flyback converter has a voltage gain of nD / (1-D), where n is the transformer Turn ratio, D is the duty cycle, but due to the influence of parasitic parameters, its gain is limited; another example is the quasi-Z source converter, its voltage gain is 1 / (1-2D), which has a certain improvement compared with the Boost converter , but there is still room for improvement

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