Why my push-pull is giving 0 V?
Hi,
I am designing a push-pull converter. I copied the control from this example after having tried the control that was in another example made by a user. However, that one wasn’t giving a correct closed-loop answer as it was giving an input of 0 to the gates while the output voltage was stable. So someone suggested me to see the example from the first link and now that control is making the output voltage to be 0 V. The control is as shown below:
As you can see, my reference voltage is 350 V and the switching frequency is 50000 Hz. My input voltage is 137.14 V because it will come from another stage that will give at most an output voltage of 137.14 V. It doesn’t even work with this control in open-loop when I connect a constant value of 0.159 to the gain of 0.5 and the PI and comparison of the left is not connected.
I know that in a push-pull the transistors conduct the same time but not simultaneously a maximum of 50% each, but could someone explain me how this control ensures this and why is not working for me?
I see that the left transistor is not switching by looking at the waveforms:
The gate_L waveform is the top right one and the top left is for the output voltage.
Also, these are the values I have in the multi-winding transformer (no taps) as I am using the black blocks and not the blue as in the example:
The push-pull looks like this:
Thanks.
CarlosHi,
I am designing a push-pull converter. I copied the control from this example after having tried the control that was in another example made by a user. However, that one wasn’t giving a correct closed-loop answer as it was giving an input of 0 to the gates while the output voltage was stable. So someone suggested me to see the example from the first link and now that control is making the output voltage to be 0 V. The control is as shown below:
As you can see, my reference voltage is 350 V and the switching frequency is 50000 Hz. My input voltage is 137.14 V because it will come from another stage that will give at most an output voltage of 137.14 V. It doesn’t even work with this control in open-loop when I connect a constant value of 0.159 to the gain of 0.5 and the PI and comparison of the left is not connected.
I know that in a push-pull the transistors conduct the same time but not simultaneously a maximum of 50% each, but could someone explain me how this control ensures this and why is not working for me?
I see that the left transistor is not switching by looking at the waveforms:
The gate_L waveform is the top right one and the top left is for the output voltage.
Also, these are the values I have in the multi-winding transformer (no taps) as I am using the black blocks and not the blue as in the example:
The push-pull looks like this:
Thanks.
Carlos Hi,
I am designing a push-pull converter. I copied the control from this example after having tried the control that was in another example made by a user. However, that one wasn’t giving a correct closed-loop answer as it was giving an input of 0 to the gates while the output voltage was stable. So someone suggested me to see the example from the first link and now that control is making the output voltage to be 0 V. The control is as shown below:
As you can see, my reference voltage is 350 V and the switching frequency is 50000 Hz. My input voltage is 137.14 V because it will come from another stage that will give at most an output voltage of 137.14 V. It doesn’t even work with this control in open-loop when I connect a constant value of 0.159 to the gain of 0.5 and the PI and comparison of the left is not connected.
I know that in a push-pull the transistors conduct the same time but not simultaneously a maximum of 50% each, but could someone explain me how this control ensures this and why is not working for me?
I see that the left transistor is not switching by looking at the waveforms:
The gate_L waveform is the top right one and the top left is for the output voltage.
Also, these are the values I have in the multi-winding transformer (no taps) as I am using the black blocks and not the blue as in the example:
The push-pull looks like this:
Thanks.
Carlos push-pull converter, power_electronics_control, power_conversion_control, simulink, pi controller MATLAB Answers — New Questions
