| 1. | But the increase of switching frequency results in higher switching loss
而传统变换器开关频率的提高必然带来开关损耗的增加。 |
| 2. | But the switching loss is increased as the switching frequency is improved and so the converter efficiency is decreased
但随着开关频率的提高，硬开关的开关损耗增加，变换器的工作效率随之下降。 |
| 3. | The voltage peak and switching loss during switching of inverter is the main cause that due to the damage of igbt
逆变桥电路开关过程中出现的电压尖峰和大的开关损耗是导致主开关器件igbt损坏的主要原因之一。 |
| 4. | For increasing the switching frequency and reducing switching losses and emi noise of the pfc circuits , soft - switching technologies are adopted
在功率因数校正变换器中采用软开关变换技术可以使开关频率提高、降低开关损耗、并有效抑制emi 。 |
| 5. | However , the h - bridge maglev chopper has serious switching losses , so as to have snubber circuit ; there is high emi with the chopper
然而, h -桥斩波器开关损耗大,需要添加缓冲网络,电磁干扰十分严重;对供电电源有反向电流冲击,容易造成供电电源和滤波电容的损坏。 |
| 6. | With this method , the minimum switching losses can be reached , and the maximum switching current can be reduced effectively . so this method can meet the requirement of hvdc - vsc where lower switch loss is emphasized
这种方法开关损耗最小，并可有效降低开关器件的最大开关电流，适应了hvdc - vsc降低开关损耗的需要。 |
| 7. | First of all , the main - switches of the zvs chopper have zero - voltage turn - on and turn - off totally , so it has little switching losses . for this , the efficiency of the chopper can be improved
首先,零电压软开关斩波器的主功率器件完全实现了零电压开通和关断,所以它的热损耗很小,减小了系统的热损耗,提高了系统的电源变换效率。 |
| 8. | For the limitations of traditional pwm hard switching circuit , a kind of zero of pair soft switching technology is introduced and the switching loss can be cut down by it and the reliability of inverter in case of high frequency can be improved also
由于传统pwm硬开关电路的局限性，本文采用一种双零谐振型软开关技术降低开关损耗以及在高频情况下提高整机的可靠性。 |
| 9. | The theoretical analysis and result of simulation indicate that the two - phase modulation reduces the switching losses 50 % relative to the quasi - optimum and the space vector modulation and overmodulation can generate higher voltages with low total harmonic distortion
分析表明二相调制方法相对于准优化方法减少开关损耗近30 ，空间矢量的调制与过调制可以大大的提高直流母线电压的利用率。 |
| 10. | The inverters based on space - vector pwm technique have many good qualities , such as less pulsating torque , higher usage of dc bus voltage , less switching loss , better high - speed regulation performance , so it is applicable for the high - performance motor control system
电压空间矢量pwm技术( svpwm )将逆变器和电动机视为一体，由之控制的变频器具有输出转矩脉动量低、直流电压利用率高、开关损耗小、高速调速性能好等优点，适用于高性能电机调速控制系统。 |
