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Method and system for reducing energy-storage capacitor at output end of power converter

A technology of power converters and energy storage capacitors, applied in output power conversion devices, electrical components, high-efficiency power electronic conversion and other directions, can solve the problems of unfavorable product cost and power density control, unfavorable harmonic injection current order and proportional adjustment And other issues

Inactive Publication Date: 2019-08-16
ZHEJIANG KEENWOO TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the object of the present invention is to provide a method and system for reducing the energy storage capacitance at the output end of the power converter, which is used to solve the problem of reducing the energy storage capacitance at the output end of the power converter in the prior art. The scheme is not conducive to product cost and power density control, and is not conducive to harmonic injection current order and proportional adjustment.

Method used

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  • Method and system for reducing energy-storage capacitor at output end of power converter
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  • Method and system for reducing energy-storage capacitor at output end of power converter

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Embodiment 1

[0107] Such as image 3 As shown, this embodiment provides a method for reducing the energy storage capacitance at the output end of the power converter, and the method for reducing the energy storage capacitance at the output end of the power converter includes:

[0108] 11) Gather the input voltage at the front end of the PFC main circuit in the power converter, the PFC inductor current i in the PFC main circuit Lb And the DC bus voltage V output by the PFC main circuit bus .

[0109] Specifically, the input voltage at the front end of the PFC main circuit includes the grid input voltage U in and the input voltage U of the PFC main circuit pfc_in . In this embodiment, the input voltage at the front end of the PFC main circuit includes the grid input voltage U in .

[0110] 12) Based on the input voltage of the front end of the PFC main circuit and the DC bus voltage V output by the PFC main circuit bus , get the preset current i of the PFC inductor Lb_1 .

[0111] S...

Embodiment 2

[0162] Such as Figure 16 As shown, this embodiment provides a method for reducing the energy storage capacitor at the output end of the power converter. The difference from Embodiment 1 is that the method for obtaining the given current of the PFC inductor is different. Steps 12) to 14) are replaced by the following steps:

[0163] 12') Obtain the second compensation factor A2 based on the input voltage at the front end of the PFC main circuit.

[0164] Specifically, in this embodiment, the input voltage at the front end of the PFC main circuit includes the grid input voltage U in , the step of obtaining the second compensation factor A2 includes:

[0165] 121') based on the grid input voltage U in Obtain the phase angle θ of the fundamental wave of the grid input voltage and the sine value sinθ of the phase angle θ of the fundamental wave of the grid input voltage and the sine value sin( jθ), in this embodiment, the phase angle θ of the fundamental wave of the input volt...

Embodiment 3

[0182] Such as Figure 18 As shown, this embodiment provides a method for reducing the energy storage capacitor at the output end of the power converter. Compared with Embodiments 1 and 2, the phase angle of the fundamental wave of the grid input voltage, the fundamental wave of the grid input voltage The method of the sine value of the phase angle of n and j times the sine value of the phase angle of the fundamental wave of the grid input voltage is different, specifically comprising the following steps:

[0183] 21) Gather the input voltage at the front end of the PFC main circuit, the PFC inductor current i Lb And the DC bus voltage V output by the PFC main circuit bus .

[0184] In this embodiment, the input voltage at the front end of the PFC main circuit includes the grid input voltage U in and the input voltage U of the PFC main circuit pfc_in .

[0185] 22) Based on the input voltage U of the PFC main circuit pfc_in Obtain the absolute value |sinθ| of the sine va...

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Abstract

The invention provides a method and system for reducing an energy-storage capacitor at the output end of a power converter. The method comprises the following steps: collecting input voltage at the front end of a PFC main circuit, PFC inductor current and DC bus voltage output by the PFC main circuit; based on the input voltage at the front end of the PFC main circuit and the DC bus voltage, obtaining pre-given current of a PFC inductor and combination of n corresponding proportions of j times compensation current; injecting the combination of n corresponding proportions of j times compensation current into the pre-given current of the PFC inductor to obtain given current of the PFC inductor; generating duty ratio of a power switch tube control signal based on the PFC inductor current andthe given current of the PFC inductor; and controlling on / off of the power switch tube based on the duty ratio. The method reduces the energy-storage capacitor at the output end of the PFC conversioncircuit through a software mode, thereby greatly reducing product cost and facilitating control of power density; and adjustment of order and proportion of harmonic injection current is more flexible,and the method is suitable for industry application.

Description

technical field [0001] The invention relates to the field of power conversion, in particular to a method and system for reducing the energy storage capacitance at the output end of a power converter. Background technique [0002] Adding an active power factor correction PFC (Power Factor Correction) converter to the air conditioner inverter can improve the power factor of the grid and reduce the harmonics flowing into the grid. However, with the improvement of power factor, the energy storage capacitor at the output end of the PFC converter often needs to select a larger capacity to balance the power fluctuation of the double frequency of the power grid. The input power fluctuation forms a double frequency charge and discharge current on the energy storage capacitor, which is commonly referred to as low frequency ripple current. Usually, the capacitor manufacturer will give the tolerance value of the ripple current of this capacitor in the manual. Generally, the larger the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/42
CPCH02M1/4208Y02B70/10
Inventor 蒲波宇安伟国甘鸿坚
Owner ZHEJIANG KEENWOO TECH CO LTD
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