The Research Of Surge In Electric Power Electronic Equipment Produced By Broadband Electronic Transformer

With the rapid development of power electronics technology, the relationship between power electronics devices and our life and work becomes closer. Switching power supply is an important part of power electronic device, providing reliable power supply for electronic device, and controlling the duty cycle to achieve a stable output voltage, In order to adapt to the trends of smaller, lighter, more efficient electronics devices, operating frequency of the switching power supply is becoming higher and higher. However, the power electronic transformer, as the core components of switching power supply, its distributed parameter will seriously affect the performance of the switching power supply because of the increasing frequency. In the switching operation instant, the surge voltage and surge current caused by leakage inductance and stray capacitance may lead to increased losses, as well as serious damage to the switch and electronic equipment. Therefore, in the case of wideband to study the electronic transformer high-frequency characteristics is very important.Since the toroidal transformer with good output characteristics and anti-jamming capability, the toroidal transformer is studied as an example for how to get the leakage inductance parameters. With the principle of energy equivalence, the leakage inductance calculation method of single coil winding, single layer winding, multi-layer winding and Sandwich structure winding are obtained based on electromagnetic theory. Meanwhile, for the sake of experimental verification, in this paper, a low-power electronic transformer power transmission circuit is designed, its output current and voltage and power waveforms are observed by Cadence, and the results of circuit simulation demonstrate the effectiveness and feasibility of the design. The value of the leakage inductance obtained by analytical calculation is compared with the value obtained by experiment, which verified the analytical calculation method is accuracy and validity. Since it is difficult to reduce the leakage inductance and stray capacitance parameters simultaneously, according to the NSGA-Ⅱ algorithm, the improved NSGA-Ⅱ algorithm is proposed in this paper. From electronic transformer optimal design, the improved NSGA-Ⅱ algorithm is proved to not only get ideal optimization results, but also can upgrade the optimize performance.