Neutral-point active clamping three-level inverter, control method and control device

A three-level inverter, clamping technology, applied in the output power conversion device, electrical components, high-efficiency power electronic conversion and other directions, can solve the problems of poor stability, uneven heating of switching tubes, low power conversion efficiency, etc. Achieve the effect of reducing voltage stress, improving power conversion efficiency, and uniform heating

Pending Publication Date: 2020-09-25
SINENG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The embodiment of the present invention provides a midpoint active clamp three-level inverter, which aims to solve the problems of uneven heating of each switching tube in the circuit, low power conversion efficiency and poor stability

Method used

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  • Neutral-point active clamping three-level inverter, control method and control device
  • Neutral-point active clamping three-level inverter, control method and control device
  • Neutral-point active clamping three-level inverter, control method and control device

Examples

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Embodiment 1

[0035] like figure 1 as shown, figure 1 It is a circuit diagram of a midpoint active clamping three-level inverter provided by an embodiment of the present invention. The midpoint active clamping three-level inverter includes: a bridge arm unit 2, and the bridge arm unit 2 connected to the clamping unit 3, and the bridge arm output terminal 1 connected to the bridge arm unit 2.

[0036] The bridge arm unit 2 includes a first switch tube T1, a second switch tube T2, a third switch tube T3, and a fourth switch tube T4 connected in series in sequence, corresponding to the first switch tube T1 and the second switch tube T4 one by one. The first diode D1 , the second diode D2 , the third diode D3 and the fourth diode D4 are connected in antiparallel to the T2 , the third switch tube T3 , and the fourth switch tube T4 .

[0037] The clamping unit 3 includes a fifth switch tube T5 and a sixth switch tube T6 connected in series in sequence, corresponding to the fifth diode D5 and th...

Embodiment 2

[0056] like figure 2 as shown, figure 2 It is a flow chart of a control method for a midpoint active clamping three-level inverter provided in an embodiment of the present invention, which is used for the midpoint active clamping three-level inverter provided in the above embodiment, The control method of the midpoint active-clamped three-level inverter includes the following steps:

[0057] Step 101. Obtain the first drive signal, the second drive signal, and the third drive signal corresponding to the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, and the sixth switch tube. signal, the fourth driving signal, the fifth driving signal and the sixth driving signal.

[0058] Wherein, the first driving signal, the second driving signal, the third driving signal, the fourth driving signal, the fifth driving signal and the sixth driving signal are used to drive the first switching tube, the second switching tube,...

Embodiment 3

[0094] like Figure 13 as shown, Figure 13 It is a schematic structural diagram of a control device for a midpoint active-clamped three-level inverter provided by an embodiment of the present invention. The control device 400 for a midpoint active-clamped three-level inverter includes:

[0095] The obtaining unit 401 is configured to obtain the first drive signal, the second drive signal, the second drive signal, The third driving signal, the fourth driving signal, the fifth driving signal and the sixth driving signal.

[0096] Wherein, the first driving signal, the second driving signal, the third driving signal, the fourth driving signal, the fifth driving signal and the sixth driving signal are used to drive the first switching tube, the second switching tube, and the third switching tube , the fourth switching tube, the fifth switching tube and the sixth switching tube. The first driving signal, the second driving signal, the third driving signal, the fourth driving si...

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PUM

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Abstract

The invention is suitable for the technical field of inverters, and provides a neutral-point active clamping three-level inverter, a control method and a control device. The neutral-point active clamping three-level inverter comprises a bridge arm unit, a clamping unit connected with the bridge arm unit, and a bridge arm output end connected with the bridge arm unit. The bridge arm unit comprisesa first switching tube, a second switching tube, a third switching tube and a fourth switching tube, and a first diode, a second diode, a third diode and a fourth diode which are in anti-parallel connection with the first switching tube, the second switching tube, the third switching tube and the fourth switching tube. The clamping unit comprises a fifth switching tube, a sixth switching tube, a fifth diode and a sixth diode, wherein the fifth diode and the sixth diode are connected with the fifth switching tube and the sixth switching tube in antiparallel. The fifth diode and the sixth diodeare silicon carbide diodes. Non-uniform heating of each switching tube can be reduced, and the electric energy conversion efficiency and stability are improved.

Description

technical field [0001] The invention belongs to the technical field of inverters, and in particular relates to a midpoint active clamp three-level inverter, a control method and a control device. Background technique [0002] The inverter is a power conversion device that converts direct current into alternating current. In practical applications, two-level and three-level topologies are mostly used, and the three-level topology is divided into T-type three-level, I-type three-level and midpoint Active clamp tri-level etc. The existing extension and control processing scheme of the inverter: 1. T-type three-level is suitable for 1000V system due to the limitation of switch tube specifications, and I-type three-level switch tubes of different specifications can be selected to deal with 1000V system and 1500V system respectively. However, the performance of the inner tube and the clamping diode of the I-type three-level is relatively limited, and the clamping switch tube is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/487
CPCH02M7/487H02M1/0054Y02B70/10
Inventor 苑红邓福伟罗劼李爱刚
Owner SINENG ELECTRIC CO LTD
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