6 pulses rectifier
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Posted by Enzo Ternavasio on December 12, 2005, 10:44 am
Please log in for more thread options Is there someone who knows some micro/dsp to use in developing a 6 pulses rectifier (or even 12 pulses). I have a blackfin of Analog, but i do not know if there is something better. Enzo | |||||||||||||||||||||||||
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Posted by Frithiof Andreas Jensen on December 12, 2005, 11:54 am
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I would choose ease-of-implementation over fast - mains commutated rectifiers is usually an application that have response times that runs over *many* 50/6 Hz cycles; The shortest response time will be the about 3.33 msec that it takes to swith one rectifier on at a new angle. IMO it would require effort to find a CPU *not* fast enough or *work* to make it too slow ;-) Look for chips that have driver logic built in. For example the Infineon C166 - got 3 phase motor drive logic built in (and many other typical "converter modes" by setting the right options). This is an old chip Something similar and better might be around. . Beware of what is out there: Some people derive the phase reference from some central clock locked to a 50 Hz reference off one phase - this is a common mistake that will show excess output ripple and blow big fuses more often than it has to (Makes the site tech happy though, I have about 700 grammes of pure Silver stashed from such a job ;-). You have to measure and control the firing angles on all the three phases - because out in the real world, the 3 phase system might not be symmetric. Essentially, what you will be building are three, single-phase, 2-scr rectifier modules with the outputs paralleled and each phase controller derives it's reference from the voltage between its own phase and the midpoint/neutral. That works even when the system is skewed. And then you might not need one "super-micro" to control it all - maybe it is easier to use three for phase angle control and one for calculating the phase angle, hosting the control algorithm and distribute it to the SCR modules. The CAN bus might be plenty fast for that kind of thing. So, cpus with: 16 Bit CPU, CAN, ADC and some drive logic is the business. > Enzo
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Posted by Ken Smith on December 13, 2005, 3:03 pm
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[... 3 phase control ...] >So, cpus with: 16 Bit CPU, CAN, ADC and some drive logic is the business.
An 8 bit micro or even a 4 bitter is more than enough. You have "days" to do the multidigit math. Micros with built in timers would be easier to do it with. -- -- kensmith@rahul.net forging knowledge | |||||||||||||||||||||||||
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Posted by on December 14, 2005, 5:43 am
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Enzo Ternavasio wrote: > Is there someone who knows some micro/dsp to use in developing a 6 pulses
> rectifier (or even 12 pulses). > I have a blackfin of Analog, but i do not know if there is something better. > > Enzo I did this back in the 80's with a 8051, 12Mhz, 40pin bottom spec device. Just about anything with enough pins will do. | |||||||||||||||||||||||||
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Posted by Enzo Ternavasio on December 14, 2005, 8:53 am
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Thanks a lot for your answers Enzo Ternavasio | |||||||||||||||||||||||||
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> rectifier (or even 12 pulses).
> I have a blackfin of Analog, but i do not know if there is something