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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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