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4-quadrant DC/DC converter - advantage and disadvantage

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Mehran:
I have been given a multi-part question to answer. Answered everything but stuck on the last part, which asked for a 4-quadrant DC/DC converter - advantage and disadvantage but can't use complexity and
cost as a disadvantage. I cant use the lecture sides since... don't want to say any bad... but not up to standard for an EE course. Google is like  :horse: plenty of advantages but not being able to say cost or complexity for a disadvantage has really cut me off at the knees.
Any good technical reasons why a 4-quadrant DC/DC converter should not be used over a 2-quadrant? Or a drawback...or anything other than cost or complexity?

Any ideas? thanks

Siwastaja:
The question seems, IMHO, so strange that just making sure, do you know what 4-quadrant operation means? Let's start there.

Obviously, if you require 4-quadrant operation, then it's indeed an "advantage" being able to do what you need to do. If you don't require it, then there are the obvious disadvantages of complexity and cost you already listed.

Benta:
I'm also stumped.
OP, could it be that you mean full-bridge vs. half-bridge?

Picuino:
1 quadrant means positive voltage and positive current. You feed a motor only in one direction and only for accelerate, not to slow it down.
You can do this with one transistor.

2 quadrant means positive voltage and positive or negative current. The motor runs only in one direction but in this case you can accelerate and decelerate it. In this case you need 2 transistors (half bridge) and has one disaventage: the deceleration energy of the motor pushes up the input voltage so, to avoid this, one mechanism is necessary to consume this electric energy.

4 quadrant is the same that 2 quadrant with the capacity of moving the motor in both directions. In this case you need 4 transistors (full bridge)

Benta:

--- Quote from: Picuino on May 23, 2020, 08:10:03 pm ---1 quadrant means positive voltage and positive current. You feed a motor only in one direction and only for accelerate, not to slow it down.
You can do this with one transistor.

2 quadrant means positive voltage and positive or negative current. The motor runs only in one direction but in this case you can accelerate and decelerate it. In this case you need 2 transistors (half bridge) and has one disaventage: the deceleration energy of the motor pushes up the input voltage so, to avoid this, one mechanism is necessary to consume this electric energy.

4 quadrant is the same that 2 quadrant with the capacity of moving the motor in both directions. In this case you need 4 transistors (full bridge)

--- End quote ---

From the Department of the Obvious.   :palm:

There's a heck of a lot of difference between a DC/DC converter and a motor controller.

We're still waiting for the OP's reply. I have a feeling it's a language issue.

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