designing of resonant LC dc dc converter

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vamsi krishna741651

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iam doing a project on resonant dc dc converter half bridge.. using zero voltage switching (ZVS). here iam attaching my abstract also.. actually my input is 24v... and a switching frequency of 100khz, and normalised frquency is 0.45.. will u sir please help in finding the values of L and C.. and what type l and c are to be used.. and also the what is the output voltge..

sir i have only 4days left out... please help in doing this..
thank you sir,
 

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  • final lc circuit.JPG
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As a general rule...

Select L and C values so that their reactive impedance is about the same as impedance of your load. Another way of saying this is, they must not seriously restrict current, at your operating frequency.

Regarding the inductor...

The greater the Henry value, the greater the reactive impedance, and the more an inductor impedes current flow. Therefore you should make the inductor small enough to permit your required current, at the operating frequency.

Its reactive impedance at a given frequency is calculated as:

X_L = 2 Pi f L

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Its ohmic resistance must not be too great either. This is the value you measure with an ordinary VOM.

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Regarding the capacitor...

The smaller the Farad value, the greater its reactive impedance, and the more it impedes current flow.

Capacitive impedance formula:

X_C = 1 / (2 Pi f C)

Therefore the Farad value must be high enough to pass the desired amount of current, at your operating frequency.

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The above is only a general rule.

It would help for you to run simulations, to demonstrate the waveforms in your circuit. You'll want to see what is the influence of the L and C values.
 


thank you sir, for ur valuable suggestion.. will u please suggest me values of inductor and capacitor.. the switching frequency of 100khz.. and resonant frequency of 1)222.222khz,
2)45Khz.. sir pls send me the suggested vaues of both resonanat frequencies..
thank you
 


Your schematic appears to be in simulator software. You'll need to run many simulations to get your answer. You need to look at waveforms, Ampere levels, etc.

You state two resonant frequencies. It is not clear how you expect your circuit to operate. It is not clear how you expect resonant action to cooperate with switching action.

You may need to split up your circuit into sections, and discover how each section performs. Tailor the values so that you obtain desired operation.

Try changing LC values. Try different LC ratios.

Inductor value upward, capacitor downward, in steps of 2x. This will maintain the same resonating frequency.

Solve for values using the formula for resonant frequency:

f_resonant = 1 / (2 Pi √(LC) )
 

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