Add dead time in Simulink

Hi, I am trying to control an H bridge cell. So in order to avoid two swithes turn ON at the same time, I need to add the dead time. I would expect a similar waveform as below. Does anyone konw how to achieve this in Simulink? Thank you so much!

Answer 1

[Rick Hyde]

We now have the Gate Driver and Half-Bridge Drive blocks in Simscape™ Electrical™ which allow you to specify dead-time/blanking time in a numerically efficient way. Please see the screenshot below. Hope you find this solution useful.

Rick

[Nueraimaiti Aimaier]

Hi,

This is helpful, thanks. However, what kind of ports (or devices) should be connect to the output of Driver? I used Simulink-PS converter for the input, it can be connected. But, at the output, I used PS-Simulink converter and it cannot connected to Simulink signal MOSFET.

[Rick Hyde]

The output pins of the driver block should be directly connected to Simscape electrical ports on semiconductor device models in the Simscape Electrical library.

Answer 2

[Yonghui Xu]

Add following blocks to your switching signal path and you can set the deadtime by setting the time delay of the transport dealy block.

[Mehedi Hasan Masud]

tor o maire bap

[Lazuardi Agung]

thanks for the answer

Answer 3

[Mark Sherstan]

try: Transport Delay

[Jiaxiu Dong]

Hi Mark,

But transport delay only shift my pulse to the rigt.

How about the part I circled red? I need a narrower band for switch 2.

Thank you so much!

[Mark Sherstan]

So this is what you would like?

From what I can see some other people have ran into the same issue for example here and here. The best solution was either go to discrete time or build the signal with delays or logic gates. I generated the signal as so.

With the top pulse generator block having values of: 1, 2, 50, 0 and the bottom pule generator block having values of 1, 2, 25,1.25.

Its not the greatest solution but hopefully that works for you?

[Jiaxiu Dong]

Hi Mark,

Thank you for your help. But the problem is that the pulse here just represent a PWM. So the PWM is not a uniform pulse, I couldn't just enter numbers. I will take a look at your suggested link. Thank you again.

[Zoe Blatsi]

Hello,

I tried this for my discrete time PWM model:

and it seems to be working alright:

you could even configure a variable delay in the "delay" block settings.

I hope that helps.

Zoe

[Mehedi Hasan Masud]

tomar maire bap

Answer 4

[Lazuardi Agung]

thanks, for solving my problem. by just adding transport delay block we can easyly add dead time control