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Modulation method and device for a 1-shaped multilevel circuit

A modulation method and multi-level technology, applied in the output power conversion device, electrical components, AC power input to DC power output and other directions, can solve the problem of insufficient bootstrap capacitor energy, unable to drive Q3, and the system cannot use bootstrap Drive and other issues to achieve the effect of reducing the number of switching operations and on-time, reducing driving loss and switching loss

Active Publication Date: 2017-04-19
SUNGROW POWER SUPPLY CO LTD
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Problems solved by technology

[0004] This modulation method is universal and can be applied regardless of pure active or reactive conditions. However, in the positive half cycle of the modulation wave Vr, Q3 works at high frequencies and Q4 is normally closed. The bootstrap capacitor C Li Insufficient energy to drive Q3, making the system unable to use bootstrap drive

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  • Modulation method and device for a 1-shaped multilevel circuit
  • Modulation method and device for a 1-shaped multilevel circuit
  • Modulation method and device for a 1-shaped multilevel circuit

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Embodiment Construction

[0055] 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.

[0056] The embodiment of the present invention discloses a modulation method for a 1-shaped multi-level circuit to realize reliable bootstrap driving, including: without affecting the modulation result and ensuring that the voltage stress of each switch tube in the 1-shaped multi-level circuit is not On the premise of exceeding the limit, close all or part of the reactive channels in the idle state in the 1-shaped multi-level circuit, and when the bootstrap dri...

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Abstract

The application discloses a modulating method and a modulating device of a 1-type multi-level circuit. The method comprises the following steps: closing all or partial reactive channels in idle state in the 1-type multi-level circuit on the premise of not influencing the modulation result and guaranteeing that each switch tube voltage stress in the 1-type multi-level circuit is not exceeded, and increasing the conduction time of a low-voltage tube in a preset modulation region when the bootstrapping drive charge of the 1-type multi-level circuit is lower than the preset standard so as to realize reliable bootstrapping.

Description

technical field [0001] The present invention relates to the technical field of power electronics, and more specifically, to a modulation method and device for a 1-shaped multilevel circuit. Background technique [0002] Most of the existing 1-shaped multi-level circuits use isolated drive circuits to drive the switch tubes. Compared with the isolated drive circuit, the bootstrap drive circuit not only has the advantages of simple structure, small size, high efficiency, and low cost, but also can reduce the number of isolated drive power circuits, thereby reducing the cost and volume of the auxiliary power supply, but it is limited by the 1-shaped The existing modulation methods of multi-level circuits often have the problem of insufficient bootstrap drive charge in practical applications. [0003] by figure 1 The shown 1-shaped three-level circuit using a bootstrap drive circuit is taken as an example, wherein the switching tubes Q1 and Q2 are high and low voltage tubes co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483
Inventor 刘宝其崔开涌薛丽英胡兵
Owner SUNGROW POWER SUPPLY CO LTD
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