High ouput power voltage using half bridge resonant

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Discussion Overview

The discussion revolves around the operation of a half bridge converter using the IR2153, specifically focusing on the output voltage across capacitors in the circuit and the effects of switching MOSFETs. Participants are exploring theoretical and practical aspects of the half bridge topology in the context of LTspice simulations.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant questions why the voltage across the two capacitors is not equal to half the source voltage (Vs/2) as expected from theory, suggesting possible interference from the transformer.
  • Another participant prompts a tracing of current flow in the circuit as the MOSFETs (M1 and M2) are switched on and off, implying a need to understand the source of current for the transformer.
  • A participant provides a description of the voltage measured at the gates of M1 and M2, indicating that the current supplied comes from the main supply, transformed into DC voltage by capacitors and resistors.
  • There is a request for clarification regarding the role of the capacitors in the circuit, indicating some confusion about their function during the switching process.
  • Another participant emphasizes the need to consider the behavior of the capacitors when the MOSFETs are activated, suggesting that their state affects the voltage across them.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus, as there are multiple interpretations of the behavior of the capacitors and the effects of the MOSFET switching. The discussion remains unresolved regarding the specific reasons for the observed voltage behavior.

Contextual Notes

There are limitations in the understanding of the circuit dynamics, particularly regarding the assumptions about capacitor behavior and the influence of the transformer, which remain unaddressed in the discussion.

akbibi
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Hi


Im doing a project based on half bridge converter of IR2153 which could produce a high output voltage using the LTspice simulation by means of half bridge topology. Well, I am just wondering as the volatge across the two capacitors that is pointed in the image shown wasnt give half the volatge source as stated in the theory of half bridge voltage source inverter. Can someone point me out and explain why the volatge across these two capacitor was not Vs/2? Does it something to do with some interference produced by the transformer in the cicuit? Thanks in advance.
 

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Trace what happens as M1 and M2 are alternately switched on / off. ALL of the current for the transformer comes from where?
 
The diagram below shows the voltage measured from the gate of M1 and M2. The blue graph and the green graph is the voltage in M1 and M2 respectively. The current supplied is basically comes from the main supply which is translated to DC voltage by means of capacitor and resistor connected labelled C1 and R1 from my understanding. Correct me if I am wrong.
 

Attachments

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Sorry I think you misunderstood... in the 1st post - follow the circuit and think about what happens to the caps - as the MOSFETs are turned on and off?
 
I am bit confused at the moment. what do you mean by the caps?
 
Back from Travels... But your OP queries "explain why the volatge across these two capacitor was not Vs/2"

What happens to these - when the MOSFETS turn on and off.
 

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