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A three-level topology circuit, single-phase inverter and three-phase inverter

A topological circuit and three-level technology, applied in the direction of high-efficiency power electronic conversion, electrical components, AC power input conversion to DC power output, etc., can solve the problem of poor versatility of soft switching circuits, difficulties in the application of soft switching circuits in inverters, Increased circuit complexity and failure points and other issues

Active Publication Date: 2021-03-26
SINENG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the soft switching circuit in the prior art is difficult to apply in the inverter, and the versatility of the soft switching circuit is poor, and some circuits need to add a large number of peripheral circuits to realize the soft switching, which increases the complexity and failure of the circuit point

Method used

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  • A three-level topology circuit, single-phase inverter and three-phase inverter
  • A three-level topology circuit, single-phase inverter and three-phase inverter

Examples

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Embodiment 1

[0042] figure 1 A schematic structural diagram of a three-level topology circuit provided in Embodiment 1 of the present invention, as shown in figure 1 As shown, the three-level topology circuit includes the positive busbar BUS+, the first inductor L1, the first switch module T1, the second switch module T2, the first diode D1, the second inductor L2, and the third inductor L3 , the third switch module T3, the fourth switch module T4, the second diode D2, the neutral point BUS_0 and the bus negative pole BUS-; the first end of the first inductor L1 is electrically connected to the bus positive pole BUS+, and the first inductor The second end of L1 is electrically connected to the input end of the first switch module T1; the output end of the first switch module T1 is electrically connected to the input end of the second switch module T2; the output end of the second switch module T2 is connected to the second inductor L2 is electrically connected; the anode of the first diod...

Embodiment 2

[0048] figure 2 A schematic structural diagram of a three-level topology circuit provided in Embodiment 2 of the present invention, as shown in figure 2 As shown, in addition to the three-level topology circuit in Embodiment 1, the three-level topology circuit in this embodiment also includes a third diode D3, a first capacitor C1, a fifth switch module T5, and a fourth diode Tube D4, fourth inductor L4, second capacitor C2, fifth diode D5, third capacitor C3, sixth switching module T6, sixth diode D6, fifth inductor L5 and fourth capacitor C4; The anode of the third diode D3 is electrically connected to the second end of the first inductor L1, and the cathode of the third diode D3 is electrically connected to the first end of the first capacitor C1; the second end of the first capacitor C1 is electrically connected to the second end of the first capacitor C1. The neutral point BUS_0 is electrically connected; the input end of the fifth switch module T5 is electrically conn...

Embodiment 3

[0057] Embodiment 3 of the present invention provides a single-phase inverter. The single-phase inverter includes a three-level topology circuit provided by Embodiment 1 and Embodiment 2 of the present invention. The three-level topology circuit reduces the Loss, improve the current utilization rate of the switching tube, and improve the conversion efficiency of the single-phase inverter.

[0058] Embodiment 3 of the present invention also provides a three-phase inverter. The three-phase inverter includes Embodiment 1 and Embodiment 2 of the present invention to provide a three-level topology circuit. The three-level topology circuit reduces the switching The tube loss is improved, the current utilization rate of the switching tube is improved, and the conversion efficiency of the three-phase inverter is improved at the same time.

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Abstract

The invention discloses a three-level topology circuit, a single-phase inverter and a three-phase inverter. The first end of the first inductor of the three-level topology circuit is electrically connected to the positive pole of the bus bar, and the second end is electrically connected to the input end of the first switch module; the output end of the first switch module is connected to the input of the second switch module Terminals are electrically connected; the output end of the second switch module is electrically connected to the second inductor; the positive pole of the first diode is electrically connected to the neutral point, and the negative pole is electrically connected to the input end of the second switch module; the third inductor The first end of the first end is electrically connected to the negative pole of the bus bar, and the second end is electrically connected to the output end of the fourth switch module; the input end of the fourth switch module is electrically connected to the output end of the third switch module; the input end of the third switch module It is electrically connected with the second inductor; the anode of the second diode is electrically connected with the output terminal of the third switch module, and the cathode is electrically connected with the midpoint of the bus bar. In order to realize the soft switching of the inverter and improve the conversion efficiency of the inverter.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of power electronic devices, in particular to a three-level topology circuit, a single-phase inverter and a three-phase inverter. Background technique [0002] The soft switching circuit is to turn on or off the switch tube so that the voltage at both ends of the switch tube is zero or the current through the switch tube is zero, so as to realize zero-voltage turn-on or zero-current turn-off, and reduce the turn-on and turn-off loss of the switch tube , improve the conversion efficiency of the switch tube, and can be widely used in electric energy conversion devices of power electronic devices. [0003] At present, soft switching circuits are mostly used in DC-DC conversion devices, and require a specific topology or need to add peripheral circuits to realize the soft start of the switching tube. [0004] However, the soft switching circuit in the prior art is difficult to apply in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483
CPCH02M7/483H02M1/0058Y02B70/10
Inventor 赵龙苑红李爱刚
Owner SINENG ELECTRIC CO LTD
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