Reverse current without reversing voltage?

Click For Summary

Discussion Overview

The discussion revolves around the operation of choppers in power electronics, specifically whether a chopper can function in both the first and second quadrants, allowing for positive voltage across the load while having both positive and negative load current. Participants explore the implications of this configuration and related concepts.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant questions the feasibility of a chopper operating in both the first and second quadrants, expressing skepticism about its possibility.
  • Another participant suggests that while current cannot be reversed, it can be made out of phase with the voltage, referencing the role of impedance in reactive circuits.
  • A participant acknowledges the phase shift due to reactances and seeks clarification on whether a chopper exists that can operate in both the first and second quadrants, indicating a need for visual aids to facilitate understanding.
  • One participant admits to a lack of familiarity with power electronics but expresses willingness to engage with the provided diagram for further clarification.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the possibility of a chopper operating in both the first and second quadrants, with differing viewpoints and a lack of definitive answers.

Contextual Notes

There is an assumption that the discussion is grounded in the principles of power electronics, but specific definitions and operational parameters of the choppers in question are not fully explored.

roTTer
Messages
18
Reaction score
1
I was studying First and Fourth quadrant choppers and that got me thinking.

Can the chopper run in the first and second quadrants meaning always Positive voltage across the load and Positive and negative load current.

My reasoning makes me think that it is not possible.

Any help?
 
Engineering news on Phys.org
You can't reverse current as such, but you can make it pi radians out of phase with the voltage.

It is caused by the imaginary part of impendance, in reactive circuits.

No clue what the context is - But chances are this is your answer.
 
I am aware of the phase shift using reactances.

Choppers are part of the Power electronics subject that we have in our courses.

The question that I have is there a chopper designed that can perform in the I and II quadrant?

I'll post the image of the I and IV quadrant chopper to clear things out more.
 
Ahh, my appologies in that case, power electronics is black magic to me, but if you post a diagram I'll definitelly try to work it out.
 

Similar threads

  • · Replies 8 ·
Replies
8
Views
3K
  • · Replies 26 ·
Replies
26
Views
3K
Replies
22
Views
2K
  • · Replies 16 ·
Replies
16
Views
8K
  • · Replies 7 ·
Replies
7
Views
4K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 5 ·
Replies
5
Views
3K
Replies
64
Views
8K
  • · Replies 10 ·
Replies
10
Views
2K
Replies
4
Views
2K