Hybrid quasi Z source converter with discontinuous input current

Abstract

The invention provides a hybrid quasi Z source converter with a discontinuous input current. The converter comprises a direct current input power supply, a first inductor (L<1>), a first diode (D<1>), a first capacitor (C<1>), a second capacitor (C<2>), a second inductor (L<2>), a second diode (D<2>), a third capacitor (C<3>), a fourth capacitor (C<4>), a third inductor (L<3>), a third diode (D<3>), a fifth capacitor (C<5>), a sixth capacitor (C<6>), a fourth inductor (L<4>), a switch tube (S), a fourth diode (D<4>), an output capacitor (C<out>) and a load. Compared with a Boost converter, a Z source direct-current converter and the like, the hybrid quasi Z source converter with the discontinuous input current 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 with intermittent input current. Background technique [0002] In recent years, with the increasing depletion of fossil energy such as petroleum and coal, countries all over the world are vigorously developing new renewable clean energy. Therefore, the research on grid-connected power generation and related technologies of renewable energy such as solar photovoltaics and fuel cells is on a global scale. Has received extensive attention. Because the output voltage of single fuel cells and photovoltaic cells is low, a DC power converter with a higher boost function is usually required as an interface circuit to convert the lower battery voltage (18-50V) to a sufficiently high DC voltage (200 ~400V), and then carry out inverter to connect to the grid to generate electricity, or supply independent AC load. However, many boost DC / DC converters are limited...

AI Technical Summary

Problems solved by technology

However, many step-up DC / DC converters are limited by the duty cycle, heat generation and loss, and cannot achieve a large boost. For example, the Boost converter has a voltage gain of 1 / (1-D), and D is the duty ratio, but due to the influence of parasitic parameters, its gain is limited; another example is the Z-source DC 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 , there is also the problem of starting inrush current

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