Flicker Index
Senior Member
- Location
- Pac NW
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- Lights
As opposed to proper DC such as something you'd get from a battery.
What is the name for unidirectional arches coming out from a bridge rectifier?
- Thread starter Flicker Index
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winnie
Senior Member
- Location
- Springfield, MA, USA
- Occupation
- Electric motor research
I've heard 'pulsing DC'.
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Unfiltered full-wave DC.
- Location
- Tennessee NEC:2017
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- Semi-Retired Electrician
M&Ms
ptonsparky
Tom
- Occupation
- EC - retired
That's what I've called it.
Lately I've wanted to know the math involved in applying a capacitor to smooth it out a bit.
hbiss
EC, New York NEC: 2017
- Location
- Little Falls, New York NEC: 2017
- Occupation
- EC
The bigger the better to a point. What's even better is pi filtering- cap>swinging choke (reactor)>cap.
The math would involve knowing the load.
-Hal
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Then there's the capacitance multiplier:
ptonsparky
Tom
- Occupation
- EC - retired
Yes, I've put the biggest I have on them. Haven't played with adding a choke because it hasn't been that important.
If you're filtering an unregulated power supply, huge capacitors won't hurt. But large capacitance on the output of an active supply will slow the response time. There is a trade off with regulation response time and how much ripple you get.
I always used choles AKA smoothing chokes.
winnie
Senior Member
- Location
- Springfield, MA, USA
- Occupation
- Electric motor research
One downside of bigger capacitors is that the diode conduction period gets shorter and the peak current higher.
I agree - that's why we use chokes.
ptonsparky
Tom
- Occupation
- EC - retired
My uses were bench top testing and have never been mission critical. PLCs, HMIs transducers, etc all seemed to work. Anything out the door only saw real power supplies
- Location
- San Francisco Bay Area, CA, USA
- Occupation
- Electrical Engineer
Not to mention the capacitor charging current goes up, requiring a more robust presage circuit.
Flicker Index
Senior Member
- Location
- Pac NW
- Occupation
- Lights
90 or 180v dc motors used in equipment like treadmill relies in the zero crossing to be able to control speed.
https://www.grainger.com/product/5X412 devices like this essentially work like a wall light dimmer.
Also, switch and fuse rating for unidirectional arches are comparable to AC rating.
A steady 90v DC can't be controlled with a simple SCR and switches and fuses are completely different as well.
https://www.grainger.com/product/5X412 devices like this essentially work like a wall light dimmer.
Also, switch and fuse rating for unidirectional arches are comparable to AC rating.
A steady 90v DC can't be controlled with a simple SCR and switches and fuses are completely different as well.