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Bus capaeitance current weakening method and device

A technology of busbar capacitance and current, which is used in output power conversion devices, electrical components, conversion equipment with intermediate conversion to AC, etc.

Inactive Publication Date: 2007-12-19
DELTA ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method also has a certain effect, but if the system runs in a high temperature environment, this method also has certain limitations

Method used

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  • Bus capaeitance current weakening method and device
  • Bus capaeitance current weakening method and device
  • Bus capaeitance current weakening method and device

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Experimental program
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Embodiment Construction

[0033] In order to reduce the capacitor current of the DC bus, the present invention improves the design of the multi-stage converter from the perspective of the main circuit topology. The main circuit architecture of the first stage adopting frequency multiplication power factor correction circuit and the latter stage adopting phase-shifted full bridge circuit is proposed. As shown in Figure 4. The latter stage of the system uses the same circuit as Figure 1, the main difference is that the power factor correction circuit of the previous stage is improved, and the original single structure is changed to a dual structure. In the left part of the figure, Vin, inductors La, Lb, power switch components Sa, Sb, power secondary components Da, Db and bus capacitor C1 constitute a power factor correction unit. La, Sa, Da correspond to Lb, Sb, and Db respectively, each forming an independent unit. Its general working principle has two points. One is that the control signals of the two swi...

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Abstract

The invention discloses a dipolar structure with dc bus. The preceding stage is power factor correcting circuit (PFC circuit), while the back stage is the direct current-direct current transfer circuit. The dc bus is between the two poles. The preceding stage transforms the direct current into the alternating current and infuses it into the dc bus, while the direct current-direct current transfer unit of the back stage draws the current out of the dc bus. We need to connect a generatrix capacitor parallelly to connect the two stages, only make the alternating current (that is the generatrix capacitor current) pass through it to balance the instantaneous power imbalance between the two stages. The invention provides a method of weakening the generatrix capacitor current and its device.

Description

Technical field [0001] The present invention relates to a method and device for weakening bus capacitance current, in particular to a DC-DC conversion circuit with bus capacitance current weakening effect. Background technique [0002] In power electronic converters, considering the reliability of the circuit and the ease of production, a multi-level circuit structure is often used. Almost all multi-stage structures have a DC bus (DC Bus). Large electrolytic capacitors are often connected in parallel on the DC bus. For example, a common communication power supply usually uses a two-stage structure with a DC bus. The front stage is usually a power factor correction circuit (PFC circuit), and the latter stage is a DC-DC conversion circuit. Between the two stages is the so-called DC bus. The front stage converts AC power into DC power and injects it into the DC bus. The latter DC-DC conversion unit draws current from the DC bus. When the circuit works in a steady state, the average ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/14H02M3/28
CPCY02P80/10
Inventor 应建平张庆友邱爱斌刘腾郭兴宽曾剑鸿
Owner DELTA ELECTRONICS INC