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Low-ripple soft-switching Cuk converter circuit and modulation method

A modulation method and soft switching technology, which is applied to the conversion equipment of Cuk converter, the conversion equipment without intermediate conversion to AC, the conversion of DC power input to DC power output, etc., which can solve the problem of low efficiency and power density of Cuk converter Low, large output ripple, etc., to achieve the effect of improving life, reducing output ripple, and reducing switching loss

Pending Publication Date: 2022-03-01
JIANGSU UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of low efficiency, low power density and large output ripple in the traditional Cuk converter, the present invention proposes a low-ripple soft-switching Cuk converter circuit and modulation method

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  • Low-ripple soft-switching Cuk converter circuit and modulation method
  • Low-ripple soft-switching Cuk converter circuit and modulation method
  • Low-ripple soft-switching Cuk converter circuit and modulation method

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments of the present invention.

[0021] Such as figure 1 As shown, a schematic diagram of the circuit topology of a low-ripple soft-switching Cuk converter provided by the present invention, including: link energy storage capacitor C 1 , Resonant capacitance C s and output filter capacitor C o , resonant branch diode D ax , main switch Q 1 , Q 2 and auxiliary resonant switch Q ax , input inductance L 1 , output inductance L 2 and resonant inductance L ax and L 1 , L 2 Coupled inductance M after coupling.

[0022] The input inductance L 1 The input terminal of the DC source is connected to the positive pole of the DC source, and the other terminal is respectively connected to the main switching tube Q 1 The drain and resonant inductance L ax The input terminal is connected, the main switch tube Q 1 The drains respectively and the input inductance ...

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Abstract

The invention discloses a low-ripple soft-switching Cuk converter circuit and a modulation method, and belongs to the field of power electronics, and the low-ripple soft-switching Cuk converter circuit comprises a link energy storage capacitor C1, a resonant capacitor Cs, an output filter capacitor Co, a resonant branch diode Dax, main switching tubes Q1 and Q2, an auxiliary resonant switching tube Qax, an input inductor L1, an output inductor L2, a resonant inductor Lax and a coupling inductor M after the L1 and the L2 are coupled. The converter realizes zero-voltage conduction and zero-current turn-off of the main switch tube Q1, zero-voltage conduction of the main switch tube Q2 and zero-current turn-off of the anti-parallel diode DQ2 by controlling conduction and turn-off of the main switch tubes Q1 and Q2 and the auxiliary resonant switch tube Qax. The invention has the advantages that: 1) the output current ripple is small, and the power factor is high; 2) the link energy storage capacitor is designed in a critical conduction working mode, and a small-capacitance non-electrolytic capacitor can be used to replace an electrolytic capacitor; and 3) the soft switching function of main switching devices of the converter is realized, and the coupling inductance technology reduces the output ripple of the converter.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a low-ripple soft-switching Cuk circuit and a modulation method, which are suitable for switching power supplies and belong to the field of direct current / direct current (DC / DC) converters. Background technique [0002] With the rapid development of renewable energy systems, smart grids, and electric vehicles, the demand for high-performance non-isolated / isolated DC-DC converters has increased significantly in numerous applications. Since the main operating principles of basic power converters are well understood, the power density and efficiency of converters have received increasing attention. [0003] The most straightforward way to improve power density is to increase the switching frequency, since the size and volume of the built-in passive components are highly dependent on this. However, an increase in switching frequency can cause electromagnetic in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/00H02M1/14H02M3/07H02M1/088
CPCH02M3/005H02M1/14H02M3/07H02M1/088
Inventor 廖志凌王震娄金山
Owner JIANGSU UNIV
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