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An ultra-wide voltage range isolated llc converter

An ultra-wide voltage, isolation transformer technology, applied in the direction of adjusting electrical variables, converting DC power input to DC power output, instruments, etc., can solve the problem of large output voltage range of DC charging piles and design difficulties of isolated DC-DC converters etc. to achieve the effects of simplified circuit layout design, high switching power supply efficiency, and simple control

Active Publication Date: 2021-06-11
NANJING INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the different design standards of electric vehicle manufacturers, the charging system needs to be designed and installed uniformly, resulting in a large range of DC charging pile output voltage, especially for the design of isolated DC-DC converters.

Method used

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  • An ultra-wide voltage range isolated llc converter
  • An ultra-wide voltage range isolated llc converter
  • An ultra-wide voltage range isolated llc converter

Examples

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Embodiment Construction

[0046] The present invention will be further described below. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0047] see figure 1 , the present invention provides an ultra-wide voltage range isolated LLC converter, including 2 H-bridge circuits, 2 LLC resonant circuits, 2 isolation transformers and 1 three-phase rectifier; wherein, the 2 H-bridge circuits are connected to the input Terminal power supply, as follows:

[0048] The first H-bridge circuit includes 4 MOSFET tubes S1-S4, of which S1-S2 forms the left bridge arm, and S3-S4 forms the right bridge arm; the second H-bridge circuit includes 4 MOSFET tubes S5-S8, of which S5- S6 forms the left bridge arm, and S7-S8 forms the right bridge arm.

[0049] The first LLC resonant circuit includes resonant inductance Lr1, resonant capacitor Cr1, and excitation inductance Lm1 corresponding to isola...

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Abstract

The invention discloses an ultra-wide voltage range isolation type LLC converter, comprising two high-voltage side H bridge circuits, two LLC resonant circuits, two isolating transformers with the same transformation ratio and three-phase bridge circuits; The H-bridge circuit on the high-voltage side is connected to the power supply at the input end, and the primary side of the isolation transformer is connected to the midpoint of the LLC resonant circuit and the H-bridge circuit respectively; the secondary side of the isolation transformer is connected in series in reverse polarity, and the three nodes of the transformer group are connected in series. to the neutral point of the three-phase bridge circuit; the invention utilizes the advantages of LLC frequency conversion and voltage regulation, and combines the 180º phase shift of the PWM pulse to realize fast switching between series and parallel, which can realize the output voltage adjustment in a wide range, and at the same time play the role of the PWM rectifier within a certain safety range. The invention has the advantages of small switching loss, high efficiency, high power density of the power supply and small volume.

Description

technical field [0001] The invention relates to an ultra-wide voltage range isolated LLC converter, which belongs to the technical field of converters. Background technique [0002] In recent years, with the rapid development of new energy, electric vehicles and distributed distribution networks, the application and scale of energy storage batteries have continued to expand. In addition to the battery itself, the research on DC-DC converters with a wide voltage output range has become a research focus. However, due to the different design standards of electric vehicle manufacturers, the charging system needs to be designed and installed uniformly, resulting in a large output voltage range of DC charging piles, especially for the design of isolated DC-DC converters. Therefore, starting from the actual charging needs of electric vehicles, converters that meet the charging needs of electric vehicles with different specifications have become an urgent problem to be solved. Co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335B60L53/22
CPCB60L53/22H02M3/33523H02M3/33569H02M1/0058Y02T10/70Y02T10/7072Y02T10/72Y02T10/92Y02T90/14
Inventor 倪喜军白雨辰李先允王书征骆皓张东东李东野
Owner NANJING INST OF TECH
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