Non-isolated soft switching DC-DC converter with low current ripple and high voltage gain

A technology of current ripple and voltage gain, applied in high-efficiency power electronic conversion, conversion of DC power input to DC power output, adjustment of electrical variables, etc., to achieve the effect of reducing volume, reducing switching loss, and improving energy density

Active Publication Date: 2020-07-28
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These two characteristics well meet the requirements of the new energy power generation system for the input current and output voltage of the converter, but there is still the problem of hard switching

Method used

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  • Non-isolated soft switching DC-DC converter with low current ripple and high voltage gain
  • Non-isolated soft switching DC-DC converter with low current ripple and high voltage gain
  • Non-isolated soft switching DC-DC converter with low current ripple and high voltage gain

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Embodiment Construction

[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0027] The present invention provides a non-isolated soft-switching DC-DC converter with low input current ripple and high output voltage gain. The circuit topology of the converter is as follows: figure 1 shown. The circuit is mainly composed of a high gain boost circuit and a soft switching auxiliary circuit. by L 1 , S 1 、D 1 , C 1 The boost circuit constituted and consists of L 2 , S 2 、D 2 、C 2 The input of the boost circuit composed of parallel connection reduces the ripple of the input current, and they are passed by D 3 、C m The formed switched capacitor structure completes the output series connection and realizes the output high voltage gain. by only the auxiliar...

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Abstract

The invention discloses a non-isolated soft switching DC-DC converter with low input current ripple and high output voltage gain, which is composed of a high-gain boosted circuit and a soft switchingauxiliary circuit, wherein the high-gain boosted circuit comprises a first boosted circuit and a second boosted circuit, the first boosted circuit and the second boosted circuit are each composed of amain inductor, a capacitor, a diode and a main switching tube, the input ends of the first boosted circuit and the second boosted circuit are connected in parallel by adopting a two-phase staggered structure, the output ends of the first boosted circuit and the second boosted circuit are connected in series in a two-phase mode through a switched capacitor structure, the soft switching auxiliary circuit is composed of an auxiliary inductor and an auxiliary switching tube, the soft switching auxiliary circuit is connected with one phase in parallel, and zero-voltage conduction of the main switching tubes of the two boosted circuits is achieved; and the inductors of the first boosted circuit and the second boosted circuit and the auxiliary inductor are integrated in one magnetic core.

Description

technical field [0001] The invention relates to the technical field of DC-DC converters, in particular to a non-isolated soft-switching DC-DC converter with low input current ripple and high output voltage gain. Background technique [0002] With the rapid consumption of traditional fossil energy (such as oil, coal, natural gas, etc.) and the aggravation of environmental pollution, the rational and effective use of energy has attracted people's attention. Renewable energy has attracted extensive attention due to its advantages of sustainable utilization and less pollution to the environment. For renewable energy, systems such as solar photovoltaic power generation, wind power generation and fuel cell power have received more and more attention. The voltage is low, about 20-40V, and the inverter of the subsequent stage requires a higher DC bus voltage, so a DC-DC converter with high gain characteristics is required between the new energy source and the DC bus voltage. In ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158H02M1/14H02M1/44
CPCH02M3/1584H02M1/14H02M1/44H02M1/0064H02M1/0058H02M1/0077H02M1/123Y02B70/10
Inventor 王萍李博
Owner TIANJIN UNIV
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