CLTCL resonant current converter

Abstract

The invention discloses a CLTCL resonant current converter. The CLTCL resonant current converter is composed of a half-bridge inversion circuit, a CLTCL resonant circuit and a diode rectification circuit, which are connected in sequence; the converter is input through the half-bridge inversion circuit and is output from the diode rectification circuit through the action of the CLTCL resonant circuit; the half-bridge inversion circuit is composed of a first switching tube and a second switching tube; the CLTCL resonant circuit is composed of a first capacitor, a second capacitor, a first inductor, a second inductor, a first transformer and a second transformer; the diode rectification circuit comprises a first diode, a second diode, a third diode, a fourth diode and a third capacitor; the converter is of a novel direct-current converter circuit topology and can realize zero voltage switching (ZVS) and quasi-zero current switching (Q-ZCS) of the switching tubes, and zero current switching (ZCS) of the diodes of the rear-grade rectification circuit; the efficiency and capacity of the converter are improved; the CLTCL resonant current converter has the characteristic that an input / output voltage wide range is adjustable.

Description

technical field [0001] The invention belongs to a resonant soft-switching DC converter, in particular to a CLTCL resonant DC converter with high efficiency, wide frequency and wide voltage range. Background technique [0002] The vigorous development of new energy and the vigorous development of distributed energy have a significant role in alleviating the energy crisis, environmental pollution and other problems brought about by traditional fossil energy, and will play a more important role in the future. In the future household distributed energy system, various new energy sources such as small wind power generation, photovoltaic power generation, and fuel cells will be integrated in the same energy system and connected to the AC and DC voltage busbar of the household system to flexibly realize energy transmission and application. Among them, as an important part of the DC bus, the DC-DC converter plays an important role, with multiple functions such as controlling the bu...

AI Technical Summary

Problems solved by technology

The former connects resonant inductors and capacitors in series, which has many advantages such as high efficiency, zero-voltage turn-on soft switching, DC voltage isolation on the input side of the circuit, and input current following load changes. However, it is difficult to adjust the output voltage when the circuit is light-loaded. and other problems; the parallel LC circuit is to connect the resonant inductor and capacitor elements in parallel, which has the advantages of high efficiency, zero-voltage turn-on soft switch, and adjustable output voltage at no-load, but at the same time, it has low efficiency at light load, etc. question

Further, some literatures have proposed LLC resonant circuit, which has all the advantages of series and parallel LC circuits at the same time, while avoiding the shortcomings of the two traditional circuits and has good operating characteristics, but there are still some problems in this circuit: the switch tube is only It can realize zero-voltage turn-on soft switching, and cannot realize soft switching off of the switching tube at the same time, so that the efficiency of the converter cannot be further improved; the input and output voltage ranges are narrow, and the application range is limited; only a single power converter, considering the saturation of magnetic components problem, the converter transmits limited power, etc.

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