Non-input energy storage inductance soft switching isolation type three-phase PFC converter and control method thereof

A technology of energy storage inductance and input switch, which is applied in the direction of converting DC power input to DC power output, AC power input converting to DC power output, adjusting electrical variables, etc. and other problems, to achieve the effect of good stability, reliable equipment quality and improved efficiency

Pending Publication Date: 2022-04-08
刘三英
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Problems solved by technology

[0008] The object of the present invention is to provide a soft-switching isolated three-phase PFC converter without input energy storage inductance and its control method, which can solve the problem of limited application due to the complexity of the converter structure and control method in the above-mentioned prior art. technical problem

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  • Non-input energy storage inductance soft switching isolation type three-phase PFC converter and control method thereof
  • Non-input energy storage inductance soft switching isolation type three-phase PFC converter and control method thereof
  • Non-input energy storage inductance soft switching isolation type three-phase PFC converter and control method thereof

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[0053] In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. In the following description, many specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described here, therefore, the present invention is not limited to the specific embodiments disclosed below limit.

[0054] Unless otherwise defined, the technical terms or scientific terms used herein shall have the common meanings understood by those having ordinary skill in the field to which this application relates. "First", "second" and similar words used in the specification and claims of this patent application do not indicate any sequence, quantity or importance, but are only used to distinguish different components...

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Abstract

The invention relates to a non-input energy storage inductor soft switching isolation type three-phase PFC converter and a control method thereof. The non-input energy storage inductor soft switching isolation type three-phase PFC converter comprises an input switch type rectifier bridge arm group, an input absorption buffer unit, a bridge type resonant conversion unit, a transformer and a secondary rectification output unit, according to the invention, PWM driving signals in'middle 'and'high' modes are applied to switch tubes in the input switch type rectifier bridge arm group, and LLC full-bridge PWM driving signals with the frequency half of that of the input switch type rectifier bridge arm group are applied to the bridge type resonant conversion unit, so that three-phase no-input energy storage inductance isolation resonant soft switching rectification conversion and power factor correction are realized; the device is simple in structure, achieves the AC-DC conversion function, the power factor correction function, the isolation conversion function, the soft switching function and the voltage regulation function, reduces the switching loss of a power device, and is suitable for high-power-density occasions.

Description

technical field [0001] The present application relates to the technical field of DC converters, in particular to a soft-switching isolated three-phase PFC converter without input energy storage inductance and a control method thereof. Background technique [0002] In recent years, the power load capacity of single equipment has become larger and larger, most of which use three-phase power supply, such as electric vehicle charging stations, etc. If there is no PFC correction function, it will cause great damage to the power quality of the grid, and even lead to the breakdown of the power grid. As the country's requirements for power quality regulations become more and more stringent, the current high-power AC / DC power supplies must use PFC (power factor correction) circuits, including boost (Boost) and step-down (Buck) , in order to obtain a relatively stable and safe output voltage, it is generally necessary to add an isolated DC converter in the post-stage of the PFC conve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219H02M7/217H02M3/335H02M1/42H02M1/34H02M1/38H02M1/44
CPCY02B70/10
Inventor 刘斌李伦全
Owner 刘三英
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