Low-voltage-stress capacitance self-balancing seven-level inverter

A low-voltage, seven-level technology, used in electrical components, output power conversion devices, and AC power input to DC power output, etc. It can solve complex modulation/control, excessive use of power devices, and capacitor voltage balance. problems, etc.

CN109802588APending Publication Date: 2019-05-24SOUTH CHINA UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2019-05-24

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Abstract

The invention discloses a low-voltage-stress capacitance self-balancing seven-level inverter, and the inverter comprises a DC input power supply, a first capacitor, a second capacitor, a first switchtube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, a sixth switch tube, a seventh switch tube, an eighth switch tube, a ninth switch tube and a tenth switch tube. The positive electrode of the direct-current input power supply is connected with the drain electrodes of the first, third and fifth switching tubes, and the negative electrode is connected with the source electrode of the second switching tube, the source electrode of the sixth switching tube and the drain electrode of the seventh switching tube. The source electrode of the third switching tube is connected with the source electrode of the fourth switching tube, and the drain electrode of the fourth switching tube is connected with the drain electrode of the ninth switching tube and the positive electrode of the first capacitor. The negative electrode of the first capacitor is connected with the source electrode of the fifth switching tube, the drain electrode of the sixth switching tube and the positive electrode of the second capacitor. The negative electrode of the second capacitor is connected with the drain electrode of the eighth switching tube and the source electrode of the tenth switching tube. The source electrode of the eighth switching tube is connected with the source electrode of the seventh switching tube. The source electrode of the ninth switching tube is connected with the drain electrode of the tenth switching tube and the negative electrode of a load. The source electrode of the first switching tube is connected with the drain electrode of the second switching tube and the positive electrode of the load. The inverter has the advantages of self-balancing capacitance, low voltage stress and the like.
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Description

technical field

[0001] The invention relates to the technical field of a multilevel inverter (Multilevel Inverter, MLI), in particular to a low-voltage-stress capacitive self-balancing seven-level inverter. Background technique

[0002] With the increasing consumption of fossil energy and the prominence of environmental pollution, the efficient use of renewable energy (RenewableEnergy, RE) has become a very urgent need. The RE system can be applied to many industrial fields such as distributed energy, motors, and electric vehicles. As a conversion interface connecting new energy and industrial applications, multi-level inverters can output high-quality sine-wave-like ladder levels, and have attracted extensive attention from scholars in recent years. MLI has the advantages of low total harmonic distortion (Total Harmonic Distortion, THD), low electromagnetic interference (Electromagnetic Interference, EMI), low switching loss, high efficiency, etc., and is competitive in in...

Examples

Embodiment Construction

[0016] The present invention will be further described below in conjunction with specific implementation examples.

[0017] see figure 1 As shown, the capacitive self-balancing seven-level inverter with low voltage stress provided by this embodiment includes a DC input power supply V dc , the first capacitance C 1 , the second capacitor C 2 , the first switching tube S 1 , the second switch tube S 2 , the third switch tube S 3 , the fourth switch tube S 4 , the fifth switch tube S 5 , the sixth switch tube S 6 , the seventh switch tube S 7 , the eighth switch tube S 8 , the ninth switch tube S 9 , the tenth switch tube S 10 ; The DC input power supply V dc The anode of the first switching tube S is respectively connected to the 1 , the third switch tube S 3 , the fifth switch tube S 5 The drain is connected, and its negative pole is respectively connected with the second switching tube S 2 The source of the sixth switch tube S 6 The source of the seventh switc...