![](http://image.uc.cn/s/wemedia/s/upload/2024/9fa30ee8efcb83ff31881a860478ce74.png)
推挽MOS管的开关频率设置为27.624kHz,LC谐振频率为29.058kHz,使得推挽MOS管工作于零电压开关、零电流关断状态;在此基础上,调节推挽开关管的漏源极电容,在漏源极电容变化的过程中,查看对推挽软开关的影响。
.step param Cds 100pF 4.7nF 1nF
漏源极电容从100pF仿真至4.7nF,电容步进为1nF,以下为仿真波形;
Cds = 100pF
![](http://image.uc.cn/s/wemedia/s/upload/2024/d5ceda010a3563abfbb4ece61844429e.png)
Cds = 1.1nF
![](http://image.uc.cn/s/wemedia/s/upload/2024/551006675f0edcd668701ac6a19fbdfe.jpg)
Cds = 2.1nF
![](http://image.uc.cn/s/wemedia/s/upload/2024/ceb0e52572f3b00b84c33f3bab8d704a.jpg)
Cds = 3.1nF
![](http://image.uc.cn/s/wemedia/s/upload/2024/37194bb9133acae470ec2bc17c3be405.jpg)
Cds = 4.1nF
![](http://image.uc.cn/s/wemedia/s/upload/2024/ef8f86894a39cd5a1abdc9da7777b4d3.jpg)
Cds = 4.7nF
![](http://image.uc.cn/s/wemedia/s/upload/2024/48671eaa98542bcb77e690df54272f4d.jpg)
从以上波形可以看出,漏源极之间的电容增加,对与推挽MOS管的零电压开通、零电流关断没有影响;用NMOS管模型继续进行仿真,验证是否模型的不同存在影响;
![](http://image.uc.cn/s/wemedia/s/upload/2024/31a31ec627d64080ae1e2cff31db6cd9.jpg)
Cds = 100pF
![](http://image.uc.cn/s/wemedia/s/upload/2024/6a6a38d1d418f188897e0e4c326d36ae.jpg)
Cds = 1.1nF
![](http://image.uc.cn/s/wemedia/s/upload/2024/5880aab2478661d2d673b6c2f4d63663.jpg)
Cds = 2.1nF
![](http://image.uc.cn/s/wemedia/s/upload/2024/cbddc4ffc327b65b6d612e3649a76c43.jpg)
Cds = 3.1nF
![](http://image.uc.cn/s/wemedia/s/upload/2024/bfb80590f03459390010f647518370bb.jpg)
Cds = 4.1nF
![](http://image.uc.cn/s/wemedia/s/upload/2024/4cca5031429cb75c1e782aac84638a35.jpg)
Cds = 4.7nF
![](http://image.uc.cn/s/wemedia/s/upload/2024/da60ec769274e229b472cc27f187cb05.jpg)
从以上波形可以看出,推挽开关管换成NMOS开关管后,变化漏源极电容对零电流开通、零电压关断没有什么影响。