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A two-stage conversion circuit

A technology for converting circuits and circuits, applied in the direction of converting DC power input into DC power output, AC power input into DC power output, electrical components, etc., and can solve problems such as high circuit control complexity and unbalanced bus midpoint potential , to achieve the effect of reducing the complexity of circuit control

Active Publication Date: 2022-04-08
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Then, during the operation of the two-stage conversion circuit structure, the intermediate DC bus inevitably has the problem of bus midpoint potential imbalance, which leads to the need to perform real-time bus midpoint potential balance control, and the circuit control complexity is relatively high.

Method used

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  • A two-stage conversion circuit
  • A two-stage conversion circuit
  • A two-stage conversion circuit

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Embodiment Construction

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0030] see image 3 , the embodiment of the present invention discloses a two-stage conversion circuit, the front stage is a DC / DC conversion circuit with one or more outputs connected in parallel, and the latter stage is a DC / AC conversion circuit with one or more inputs connected in parallel ( image 3 Only the front stage is a DC / DC conversion circuit and the rear stage is a DC / AC conversion circuit as an example), the front and rear stages are connected to...

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Abstract

The application discloses a two-stage conversion circuit, which reduces the circuit control complexity. The front stage of the two-stage conversion circuit is one or more DC / DC conversion circuits with parallel outputs, and the second stage is one or more DC / AC conversion circuits with parallel inputs, and the front and rear stages are connected together through an intermediate DC bus; The DC / DC conversion circuit adopts a capacitor-clamped multi-level DC / DC conversion circuit topology, and the number of levels is greater than or equal to 3; the DC / AC conversion circuit adopts a capacitor-clamped multi-level DC / AC conversion circuit topology , the number of levels is greater than or equal to 3; one or more bus capacitors are arranged on the intermediate DC bus, and the multiple bus capacitors are connected in series, in parallel or in a combination of series and parallel.

Description

technical field [0001] The present invention relates to the technical field of power electronics, and more specifically, relates to a two-stage conversion circuit. Background technique [0002] figure 1 , figure 2 Two typical two-stage conversion circuits are shown, the front stage is a DC / DC conversion circuit, the rear stage is a DC / AC conversion circuit, and the front and rear stages are connected together through an intermediate DC bus. figure 1 Among them, the DC / DC conversion circuit of the front stage adopts the topology of the capacitor-clamped three-level DC / DC conversion circuit, and the DC / AC conversion circuit of the latter stage adopts the topology of the diode-clamped three-level DC / AC conversion circuit. figure 2 Among them, the front-stage DC / DC conversion circuit adopts a symmetrical DC / DC conversion circuit topology, and the rear-stage DC / AC conversion circuit adopts a capacitor-clamped three-level DC / AC conversion circuit topology. [0003] but figur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158H02M7/487
CPCH02M3/1584H02M7/487H02M1/009
Inventor 陈鹏
Owner SUNGROW POWER SUPPLY CO LTD