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Method for improving efficiency of power electronic transformer by utilizing zero-crossing detection technology

A power electronics, zero-crossing detection technology, applied in the direction of high-efficiency power electronic conversion, adjustment of electrical variables, output power conversion devices, etc. Efficiency, reduced turn-off loss, and simple and easy-to-implement solutions

Inactive Publication Date: 2020-08-28
QINGDAO TOPSCOMM COMM
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Problems solved by technology

However, the essence of the current resonant dual active bridge is to use the natural resonance process of capacitance and inductance to transmit energy, which itself is not controllable. When the IGBT control signal is applied, it will cause the hard turn-off of the IGBT, resulting in a decrease in efficiency

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  • Method for improving efficiency of power electronic transformer by utilizing zero-crossing detection technology
  • Method for improving efficiency of power electronic transformer by utilizing zero-crossing detection technology
  • Method for improving efficiency of power electronic transformer by utilizing zero-crossing detection technology

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Embodiment Construction

[0023] Hereinafter, specific embodiments of the present invention will be further described in conjunction with the accompanying drawings.

[0024] A method for improving the efficiency of a power electronic transformer using zero-crossing detection technology, the method comprising the steps of:

[0025] step 1: figure 1 It is a common topology diagram of power electronic transformers, each phase is composed of N modules, and there are 3N modules in total. Its single-module structure includes a cascaded H-bridge topology (21) and a resonance-type dual active bridge topology (1). The cascaded H-bridge topology (21) realizes AC-DC rectification, and the resonant double active bridge topology (1) realizes isolation and DC-DC change. The cascaded H-bridge topology (21) can reduce the withstand voltage requirements of power devices through cascading. The resonant dual active bridge topology (1) can reduce the requirement on the flow capacity of the switching tube through paral...

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Abstract

The invention discloses a method for improving the efficiency of a power electronic transformer by using a zero-crossing detection technology, and belongs to the technical field of power electronic transformer control. According to the technical scheme, an AD zero-crossing detection circuit (7) is used for monitoring a resonance current zero point (9) in real time; a resonance frequency is calculated through calculation of a DSP (8); a switching frequency is adjusted according to the calculation result; and IGBTs (13, 14, 15, 16, 17, 18, 19 and 20) are controlled to be turned off at the momentwhen the current is zero, so that the turn-off loss of the IGBTs (13, 14, 15, 16, 17, 18, 19 and 20) is reduced. The method is applied to the aspect of isolation stage DC-DC topology of a power electronic transformer, can reduce the system loss, is simple in control scheme, and improves the energy conversion efficiency.

Description

technical field [0001] The invention relates to the technical field of power electronic transformer control, in particular to a method for improving the efficiency of a power electronic transformer by using a zero-crossing detection technology. Background technique [0002] At present, the commonly used method of the resonant dual active bridge is to first control the switching frequency to be lower than the resonance frequency, and then apply a control signal with a duty ratio of 50% on the active side of the energy outflow according to the flow direction of the energy, and adopt a control signal for the passive measurement of the energy inflow. Diodes rectify naturally. This method needs to actively judge the direction of energy flow. To realize the natural two-way flow of energy, control signals must be applied to the IGBT at the same time on the medium voltage side (3) of the preceding stage and the low voltage side (4) of the subsequent stage. However, the essence of ...

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Application Information

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IPC IPC(8): H02M3/335
CPCH02M3/33584H02M3/33515H02M3/33523H02M1/0012H02M1/0009H02M1/0058Y02B70/10
Inventor 赵新举徐鹏飞金立亭李健勋李鸿儒王庆园纪华丽
Owner QINGDAO TOPSCOMM COMM
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