Electronics > Beginners

DC/DC converter topology identification help

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JimmyCad:
Hello,

I have came across a DC/DC converter topology used in high voltage applications. However I am struggling to understand what is happening in the circuit. I will attach an image of the converter in question. It outlines that it is a full bridge/half bridge topology.

I have seen both the half bridge and full bridge variants of the LCC converter, of which I am familiar with. However, the way this circuit is configured is quite confusing for me. I can only possibly think that the configuration is:

Two parallel half bridge LCC converters, each feeding a primary winding of the transformer. The only reason I can see this being beneficial is because the HB converter typically presents the transformer input with half of the input voltage.  maybe using two allows the full input voltage to be given, thus removing this drawback of the HB in comparison to the FB inverter which presents full voltage, which obviously is good for HV because the step up ratio is less in the FB variation. But I am fully confused by why it is labelled as a half-bridge/full-bridge converter - it can't be both, can it?

I don't see any other reason to use a half-bridge converter in a high step up high voltaeg application.

Thanks in advance!
Jim

cur8xgo:

--- Quote from: JimmyCad on July 02, 2019, 02:36:31 pm ---Hello,

I have came across a DC/DC converter topology used in high voltage applications. However I am struggling to understand what is happening in the circuit. I will attach an image of the converter in question. It outlines that it is a full bridge/half bridge topology.

I have seen both the half bridge and full bridge variants of the LCC converter, of which I am familiar with. However, the way this circuit is configured is quite confusing for me. I can only possibly think that the configuration is:

Two parallel half bridge LCC converters, each feeding a primary winding of the transformer. The only reason I can see this being beneficial is because the HB converter typically presents the transformer input with half of the input voltage.  maybe using two allows the full input voltage to be given, thus removing this drawback of the HB in comparison to the FB inverter which presents full voltage, which obviously is good for HV because the step up ratio is less in the FB variation. But I am fully confused by why it is labelled as a half-bridge/full-bridge converter - it can't be both, can it?

I don't see any other reason to use a half-bridge converter in a high step up high voltaeg application.

Thanks in advance!
Jim

--- End quote ---

Okay it looks like there are two primary windings? If each one goes to its own half bridge, and they are wound opposite each other, doesn't that make the net effect a full bridge?

JimmyCad:

[/quote]

Okay it looks like there are two primary windings? If each one goes to its own half bridge, and they are wound opposite each other, doesn't that make the net effect a full bridge?

[/quote]

That's what it looks like to me - but what is the point of using two half bridges, as opposed to a full bridge converter? What is the benefit of having two primary windings?

Also, if the windings are wound opposite to each other - wouldn't that cancel the effects and result in zero net voltage applied to the transformer windings?

 :o

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