Driving method and device of switching tube, and inverter

A driving method and inverter technology, applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve the problem of small path damping, increasing the current stress of the switch tube, and affecting the inverter inductance Problems such as the quality of the current waveform can be improved to achieve the effect of improving the quality of the current waveform and reducing the common mode current

Active Publication Date: 2022-04-08
SHENZHEN SOFAR SOLAR
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Problems solved by technology

[0003] However, the internal common-mode current loop of the inverter is composed of DC bus capacitors, switch tubes, inverter inductors, and filter capacitors. The damping of this path is small, and it is easy to form LC resonance, which increases the current stress of the switch tubes and affects the current waveform of the inverter inductor. quality

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  • Driving method and device of switching tube, and inverter
  • Driving method and device of switching tube, and inverter
  • Driving method and device of switching tube, and inverter

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[0075] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

[0076] Please refer to figure 1 , figure 1 It is a schematic structural diagram of the inverter provided in the embodiment of the present application. Such as figure 1 As shown, the inverter includes at least one phase inverter circuit and a control processing device (not shown). In this embodiment, it is taken as an example that the inverter includes a t...

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Abstract

The invention discloses a driving method and device of a switching tube and an inverter, and relates to the technical field of inverters, the driving method of the switching tube is applied to the inverter, and the method comprises the following steps: obtaining the current of each phase of the inverter, and determining the common-mode current of the inverter according to the average value of each current. A common-mode voltage suppression component of the inverter is determined according to the common-mode current and first impedance, the first impedance comprises at least one of a first resistor, a first inductor and a first capacitor, and the common-mode voltage suppression component is used for suppressing the common-mode current. And driving the switching tube according to the common-mode voltage suppression component. Through the above mode, the common-mode current can be suppressed in the working process of the inverter, and the quality of the inverter inductive current waveform is improved.

Description

technical field [0001] The present application relates to the technical field of inverters, in particular to a method and device for driving a switch tube, and an inverter. Background technique [0002] In order to reduce the ground leakage current of the photovoltaic inverter, most of the current three-phase inverters connect the midpoint of the filter capacitor to the midpoint of the DC bus to provide a low impedance path for the common mode current. In this way, most of the common-mode current flows back to the midpoint of the DC bus through the neutral line, and the leakage current of the inverter to the ground can be greatly reduced. [0003] However, the internal common-mode current loop of the inverter is composed of DC bus capacitors, switch tubes, inverter inductors, and filter capacitors. The damping of this path is small, and it is easy to form LC resonance, which increases the current stress of the switch tubes and affects the current waveform of the inverter ind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/08H02M1/088H02M1/12H02M7/5395
Inventor 易德刚资志翔姜国中
Owner SHENZHEN SOFAR SOLAR
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