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Non-isolated high-gain direct-current converter

A DC converter, high-gain technology, applied in the direction of converting DC power input to DC power output, high-efficiency power electronic conversion, instruments, etc., can solve the problem of system efficiency decline, no improvement in maximum gain, large magnetic core size and on-state loss and other problems, to achieve the effect of simple control, simple structure, and reduced on-state loss

Active Publication Date: 2021-09-03
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Similar to traditional Boost converters, under extreme duty cycle conditions, that is, D is close to 0.5, the system efficiency also drops sharply, so the actual maximum gain does not improve
In addition, in the above high-gain scheme, the average current of the input inductor is equal to the input current, so the core size and on-state loss are large

Method used

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Embodiment Construction

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

[0026] The invention provides a non-isolated high-gain DC converter, the circuit structure is as follows figure 1 shown. The non-isolated high-gain DC converter includes a DC power supply U in , Input filter capacitor C in , the first inductance L 1 , the second inductance L 2 , the third inductance L 3 , switch tube S, first diode D 1 , the second diode D 2 , the third diode D 3 , the fourth diode D 4 , the fifth diode D 5 , the six...

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Abstract

The invention discloses a non-isolated high-gain direct current converter. A direct current power supply anode of the converter is connected with the anode of an input filter capacitor, one end of a first inductor and the anode of a third diode; the other end of the first inductor is connected with the anode of a first diode and the anode of a second diode; the cathode of the second diode is connected with one end of a second inductor and the cathode of the third diode; the other end of the second inductor is connected with the anode of a fourth diode and the anode of a fifth diode; the cathode of the fifth diode is connected with the anode of a first capacitor and one end of a third inductor; the other end of the third inductor is connected with the cathode of the first diode, the cathode of the fourth diode, the anode of a sixth diode and the drain of a switching tube; the cathode of the sixth diode is connected with the anode of an output filter capacitor and one end of a direct-current load; and the other end of the direct-current load is connected with the cathode of the output filter capacitor the source electrode of the switching tube, the cathode of the first capacitor, the cathode of the input filter capacitor and the cathode of an input power supply. The converter has the advantages of strong boost capability and low current stress.

Description

technical field [0001] The invention belongs to the technical field of DC-DC step-up converters, in particular to a non-isolated high-gain DC converter. Background technique [0002] In recent years, high-gain DC-DC conversion technology has been widely used in uninterruptible power supply systems, renewable energy systems, fuel cells, and hybrid vehicles. However, in these applications, the output voltage of power modules such as photovoltaic cells, fuel cells, and storage batteries is low and varies in a wide range; for this reason, it is usually necessary to use a DC converter with a strong boost capability, and sometimes the voltage of the converter The gain even needs to reach more than a dozen to increase the output voltage to the voltage level required by the inverter. [0003] To this end, scholars from various countries have proposed various high-gain converter topologies, which can be roughly divided into two types: isolated and non-isolated. Compared with the fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/156
CPCH02M3/156Y02B70/10
Inventor 秦杨许兴
Owner JIANGSU UNIV
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