Common-ground high-gain Z source boost converter

Abstract

The invention provides a common-ground high-gain Z source boost converter comprising a direct-current input power supply, a first diode, a first inductor, a second inductor, a first capacitor, a second capacitor, a switch tube, a second diode, an output capacitor and a load. One end of the direct-current input power supply is connected with an anode of the first diode. A cathode of the first diode is connected with one end of the first inductor, one end of the first capacitor and an anode of the second diode. The other end of the first inductor is connected with one end of the second capacitor and a drain electrode of the switch tube. The other end of the first capacitor is connected with a source electrode of the switch tube and one end of the second inductor. The second diode is connected with one end of the output capacitor and one end of the load. The other end of the direct-current input power supply is connected with the other end of the second capacitor, the other end of the second inductor, the other end of the output capacitor and the other end of the load. Compared with a Boost converter and a conventional Z source boost converter, the common-ground high-gain Z source boost converter has a relatively high voltage gain.

Description

technical field [0001] The invention relates to the field of DC / DC converters, in particular to a common-ground high-gain Z-source boost converter. Background technique [0002] In the renewable energy power generation system, the output of most renewable energy such as solar energy, wind energy, and fuel cells is generally low-level DC voltage. If it is to be connected to the grid, a high-gain converter needs to be used to convert low-voltage DC into High-voltage direct current, and then output alternating current through the function of the inverter to be connected to the grid. However, the traditional DC / DC boost converter is 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), where D is the duty cycle Duty ratio, when the duty ratio is close to 1, a higher voltage gain can be obtained, but at the same time, the above-mentioned problems will be encountered; and many Z-sourc...

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Problems solved by technology

However, the traditional DC / DC boost converter is 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), where D is the duty cycle Duty ratio, when the duty ratio is close to 1, a higher voltage gain can be obtained, but at the same time, the above-mentioned problems will be encountered; and many Z-source DC / DC converters, although using the Z-source network to achieve boost, However, there is still room for improvement in the voltage gain. For example, the voltage gain of the Z-source boost converter is (1-D) / (1-2D). In addition, there are problems such as different grounds and high stress on the switch tube.

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