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DC multi-input single-output resonant converter and control method thereof

A resonant converter and resonant conversion technology, applied in the direction of converting DC power input to DC power output, output power conversion device, control/regulation system, etc., can solve the problem of miniaturization of converters, many magnetic devices, and difficulty in increasing power Density and other issues, to achieve the effect of reducing the number of magnetic devices, increasing the power density, and reducing the size of the device

Inactive Publication Date: 2017-07-14
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most multi-input and single-output resonant converters use multiple LLC resonant conversion circuits for interleaved parallel operation. Such converters have the advantages of high conversion efficiency, good current sharing effect, and low output voltage ripple noise. However, due to the interleaved parallel There are many circuits, and each LLC resonant circuit has two magnetic devices, a resonant inductor and a resonant transformer, which leads to a large number of magnetic devices in the overall circuit, making it difficult to miniaturize the converter and increase the power density.

Method used

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  • DC multi-input single-output resonant converter and control method thereof
  • DC multi-input single-output resonant converter and control method thereof
  • DC multi-input single-output resonant converter and control method thereof

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Embodiment 1

[0048] Such as figure 1 As shown, a multi-input single-output direct current (DC / DC) resonant converter proposed by the embodiment of the present invention, wherein the resonant circuit includes but not limited to the LLC resonant circuit, and the topology of the LLC resonant circuit series includes a common half-bridge type with a diode Clamp half-bridge, full-bridge, rectifier circuit can use full-bridge rectifier circuit or full-wave rectifier circuit.

[0049] In the embodiment of the present invention, the resonant circuit is a half-bridge LLC resonant circuit, and the rectifier circuit adopts a full-wave rectifier circuit as an example to illustrate this embodiment. The resonant converter includes N independent DC input sources (N is an integer multiple of 2), N primary side circuits of LLC resonant converters and secondary side rectification circuits. The N DC input sources are: V in1 , V in2 ,...,V inN , and the amplitudes of these N independent DC input sources ar...

Embodiment 2

[0053] as attached figure 2 As shown, the converter consists of the following parts: two independent and equal amplitude DC input sources V in1 and V in2 , two half-bridge LLC resonant circuits, the secondary side of each half-bridge LLC resonant circuit is connected with a full-wave rectifier circuit, and the output terminals of the two full-wave rectifier circuits are connected in parallel. V in1 and V in2 The magnitude of the bus voltage of the traditional rectifier is 1 / 2. Transformer T 1 The primary is two half-bridge LLC resonant circuits working in parallel, T 1 The secondary is two full-wave rectifier circuits working in parallel, and the two half-bridge LLC resonant circuits have resonant inductance L r1 and L r2 , transformer primary winding L m1 and L m2 . The two half-bridge LLC resonant circuits work with a phase difference of 180°, using two resonant inductors L r1 and L r2 The magnitude of the medium current is equal and the phase difference is 180°...

Embodiment 3

[0055] The difference from Embodiment 2 is that in this embodiment, there are N independent DC input sources with the same amplitude, and N is an integer multiple of 2. Each DC input source is connected to a half-bridge LLC resonant circuit, and each half-bridge LLC The transformer secondary of the resonant circuit is connected to a full-wave rectifier circuit, and the outputs of all the full-wave rectifier circuits are connected in parallel for output, and the amplitude of the independent DC input source is 1 / N of the bus voltage of the traditional rectifier. The half-bridge LLC circuits connected to each DC input source work sequentially with a phase difference of 360° / N, and the inductors and transformers in the two LLC resonant circuits with a phase difference of 180° are integrated into an inductor and transformer respectively, and the integrated transformation The device has N / 2 resonant inductors and N / 2 transformers, as attached image 3 shown.

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Abstract

The invention proposes a DC multi-input single-output resonant converter and a control method thereof, and relates to the field of a resonant filter. The DC multi-input single-output resonant converter comprises one or more parallel resonant conversion coupling pairs and an output filter circuit, wherein each parallel resonant conversion coupling pair is connected in series with the output filter circuit and comprises two resonant conversion circuits, each resonant conversion circuit comprises a resonant circuit and a rectification circuit, the resonant circuits and the rectification circuits in each resonant conversion coupling pair are coupled by a transformer, and the two resonant circuits in each resonant conversion coupling pair are coupled by an inductor. By the DC multi-input single-output resonant converter, less magnetic devices are used, and the purposes of reducing the numbers of the magnetic devices, reducing the device volume and improving the power density can be achieved.

Description

technical field [0001] The invention relates to the field of resonant converters, in particular to a DC multi-input single-output resonant converter and a control method thereof. Background technique [0002] With the development of modern power electronics technology and power switching device technology, the requirements for the efficiency and power density of switching power supplies are getting higher and higher, so how to improve the efficiency of switching power supplies and reduce the volume of switching power supplies has gradually become a research trend. [0003] At present, most multi-input and single-output resonant converters use multiple LLC resonant conversion circuits for interleaved parallel operation. Such converters have the advantages of high conversion efficiency, good current sharing effect, and low output voltage ripple noise. However, due to the interleaved parallel There are many circuits, and each LLC resonant circuit has two magnetic devices, a res...

Claims

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Application Information

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IPC IPC(8): H02M3/335
CPCH02M3/3353H02M1/0083H02M3/335Y02B70/10
Inventor 王恰
Owner ZTE CORP
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