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4-quadrant DC/DC converter - advantage and disadvantage

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ch_scr:
If you only need one direction, the 4 quadrant has the downside of having more losses, does'nt it?

Picuino:

--- Quote from: Benta on May 23, 2020, 09:50:46 pm ---Who said anything about "hard braking"? PWM is also an option. And now you're talking about "resistors placed on top of trains"?

This is no longer normal.

--- End quote ---

I need a resistor to dissipate the braking energy. Why do you say the braking resistors are not normal?
http://www.resistorguide.com/braking-resistor/


--- Quote from: ch_scr on May 23, 2020, 10:41:32 pm ---If you only need one direction, the 4 quadrant has the downside of having more losses, does'nt it?

--- End quote ---

Yes, twice as many losses because the current goes through two transistors instead of one.

Jay_Diddy_B:
Hi,

There are other examples;

Low voltage UPS.

You can have a synchronous buck batter charger, working as a synchronous boost in the back-up mode.

This is two quadrant positive voltage, positive and negative current.

TEC controller

This is two quadrant, positive voltage, positive current and negative voltage, negative current.

A class D amplifier is four quadrant.

A 4 quadrant  power supply must be fed by a two quadrant power supply, that is one that can absorb power.

In two of the quadrants power is flowing from the load back to the source.

Regards,
Jay_Diddy_B

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