The End of the Full Bridge Rectifier? (Sorry ElectroBOOM)
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Date: 2022-05-15
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Comments and reviews: 10
ibles
Probably active rectifiers are suitable for supplying reactive loads as well as complex loads such as induction heating inverters. Certain types of inverter circuits have time to throw back reactive power to the dc rail.
If you use a full-wave rectifier, the reactive power that is thrown back to the dc rail causes an instantaneous increase of voltage across the dc rail. This instantaneous increase of voltage can reach very high values that can cause damage. The instantaneous voltage rise must be limited by a limiter such as an arrester. The application of an arrester will increase the power dissipation, lowering the efficiency of the system.
If you use an active rectifier, the thrown back reactive power will be returned to the grid. The mosfet in an active rectifier acts as a bilateral switch.
Cmiiw, please
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Probably active rectifiers are suitable for supplying reactive loads as well as complex loads such as induction heating inverters. Certain types of inverter circuits have time to throw back reactive power to the dc rail.
If you use a full-wave rectifier, the reactive power that is thrown back to the dc rail causes an instantaneous increase of voltage across the dc rail. This instantaneous increase of voltage can reach very high values that can cause damage. The instantaneous voltage rise must be limited by a limiter such as an arrester. The application of an arrester will increase the power dissipation, lowering the efficiency of the system.
If you use an active rectifier, the thrown back reactive power will be returned to the grid. The mosfet in an active rectifier acts as a bilateral switch.
Cmiiw, please
reply
a1nelson
Is anyone here familiar with a boost converter IC that also acts like a rectifier MOSFET controller? Given the requirement that they be used together, a combination IC seems like the logical next step.
Of course, there are oodles and oodles of boost (+buck) converter ICs, for a huge variety of applications. However, given that the MOSFET rectifier has a somewhat narrower range of worthwhile applications, I m guessing that a combo IC would large _enough_ coverage of target applications to make it marketable. That s just speculation on my part though.
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Is anyone here familiar with a boost converter IC that also acts like a rectifier MOSFET controller? Given the requirement that they be used together, a combination IC seems like the logical next step.
Of course, there are oodles and oodles of boost (+buck) converter ICs, for a huge variety of applications. However, given that the MOSFET rectifier has a somewhat narrower range of worthwhile applications, I m guessing that a combo IC would large _enough_ coverage of target applications to make it marketable. That s just speculation on my part though.
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ashare
I think the reason why a PFC stage needs to follow such an active rectifier circuit is because of the inability of the system to prevent reverse current from the capacitor directly connected at the output i. e. when Vout > Vin. Upon a quick look at the datasheet, I couldn't find such a protection circuit mechanism in place. That could be the reason why it works well with resistive loads and not capacitive. What a PFC essentially does is mimicking a resistive load by controlling the current to be in phase with the voltage.
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I think the reason why a PFC stage needs to follow such an active rectifier circuit is because of the inability of the system to prevent reverse current from the capacitor directly connected at the output i. e. when Vout > Vin. Upon a quick look at the datasheet, I couldn't find such a protection circuit mechanism in place. That could be the reason why it works well with resistive loads and not capacitive. What a PFC essentially does is mimicking a resistive load by controlling the current to be in phase with the voltage.
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Factory400
I have been designing these active rectifier for a long time and they are amazing. until the controller is destabilized for some reason. Over time, I learned that every attempt to throw it pulses, noise, etc would reveal any stability issues.
The end result is a very high-current design with no need for a fan and many times, no need for a heat sink of any kind. Totally worth it.
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I have been designing these active rectifier for a long time and they are amazing. until the controller is destabilized for some reason. Over time, I learned that every attempt to throw it pulses, noise, etc would reveal any stability issues.
The end result is a very high-current design with no need for a fan and many times, no need for a heat sink of any kind. Totally worth it.
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Alfino
My motorcycle came with 3phase PMA and active rectifier/regulator.
It stays cool to touch even when Im running 100watt of load or if im running no load.
The body of rectifier itself doesn't even come with fins.
Compare it with similarly rated 3phase PMA with traditional FBR + SCR( shunt type) rectifier/regulator, the later came with large fins and it really warm to touch.
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My motorcycle came with 3phase PMA and active rectifier/regulator.
It stays cool to touch even when Im running 100watt of load or if im running no load.
The body of rectifier itself doesn't even come with fins.
Compare it with similarly rated 3phase PMA with traditional FBR + SCR( shunt type) rectifier/regulator, the later came with large fins and it really warm to touch.
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Balloon
Could you do a diy or buy video on a portable power station? All the ones I can find are several hundreds of dollars. I want to use my dewalt battery s to power the station. I would think I would need some inverters, usb controllers, a ac out let and some kind of case but I can t see spending any where near 500 to make one.
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Could you do a diy or buy video on a portable power station? All the ones I can find are several hundreds of dollars. I want to use my dewalt battery s to power the station. I would think I would need some inverters, usb controllers, a ac out let and some kind of case but I can t see spending any where near 500 to make one.
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shoutitallloud
I think with the capacitors fully charged, and when the MOSFETs in a bridge start to open, you have higher voltage on DC side an lower voltage on AC side. That makes a path for capacitors to discharge. So all the process is actually pumping/draining the capacitors. You still need a diode, to prevent that backflow.
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I think with the capacitors fully charged, and when the MOSFETs in a bridge start to open, you have higher voltage on DC side an lower voltage on AC side. That makes a path for capacitors to discharge. So all the process is actually pumping/draining the capacitors. You still need a diode, to prevent that backflow.
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taith2
I hope we will one day see whole unit in one package for low power applications, would pretty much take over classic rectifiers, I have low power/low voltage use for it, thing is it's 6V AC, as of now I doubt anyone soon will produce low voltage rectifier for even 4x the price or schottky bridge any time soon.
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I hope we will one day see whole unit in one package for low power applications, would pretty much take over classic rectifiers, I have low power/low voltage use for it, thing is it's 6V AC, as of now I doubt anyone soon will produce low voltage rectifier for even 4x the price or schottky bridge any time soon.
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Christopher
FBR may also be a better option in adverse thermal environments. You end up with less variation in output characteristics, which makes handling that variation safely much easier. Even with well-designed power supplies, you might be amazed how differently a device might act at -40C vs. at 85C
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FBR may also be a better option in adverse thermal environments. You end up with less variation in output characteristics, which makes handling that variation safely much easier. Even with well-designed power supplies, you might be amazed how differently a device might act at -40C vs. at 85C
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Luca
can you not just add diodest from the ac current source to each mosfet with correct orientation, that would switch them when the voltage is applied correctly. I see no need for the 2206-IC? Or am i wrong? Those diodes wouldnt have to pass a current, they only have to switch the mosfets.
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can you not just add diodest from the ac current source to each mosfet with correct orientation, that would switch them when the voltage is applied correctly. I see no need for the 2206-IC? Or am i wrong? Those diodes wouldnt have to pass a current, they only have to switch the mosfets.
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