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Three-level topological circuit, single-phase inverter and three-phase inverter

A topological circuit, 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 increasing circuit complexity and fault points, and soft switching circuits in inverters Difficult application, poor versatility of soft switching circuits, etc.

Active Publication Date: 2019-02-22
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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  • Three-level topological circuit, single-phase inverter and three-phase inverter
  • Three-level topological circuit, single-phase inverter and three-phase inverter

Examples

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Effect test

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 switch 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 present invention discloses a three-level topological circuit, a single-phase inverter and a three-phase inverter. The first end of a first inductor of the three-level topological circuit is electrically connected with the positive pole of a bus, and the second end of the first inductor of the three-level topological circuit is electrically connected with the input end of a first switching module; the output end of the first switching module is electrically connected with the input end of a second switching module; the output end of the second switching module is electrically connected with a second inductor; the positive pole of a first diode is electrically connected with a neutral point, the negative pole of the first diode is electrically connected with the input end of the secondswitching module; the first end of a third inductor is electrically connected with the negative pole of the bus, and the second end of the third inductor is electrically connected with the output endof a fourth switching module; the input end of the fourth switching module is electrically connected with the output end of a third switching module; the input end of the third switching module is electrically connected with the second inductor; and the positive pole of a second diode is electrically connected with the output end of the third switching module, and the negative pole of the second diode is electrically connected with the midpoint of the bus. The three-level topological circuit, the single-phase inverter and the three-phase inverter can achieve a soft switch of the inverter to improve the inverter swithing efficiency.

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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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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