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Old 1st December 2010, 10:37 AM   #21
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Originally Posted by zigzagflux View Post
Hmmmm. Current travels at the speed of light, regardless of capacitor size and ripple frequency, but I understand your point. However, if we consider a 20 kHz signal, it really makes no difference if we are dealing with 100Hz or 300Hz recharge on the power supply capacitors. I would argue the same for the rising edge attack of a kick drum; by the time the dynamic attack has started and is over, a 300Hz recharge is actually quite slooooow, and cannot provide recharge fast enough.

The real advantage of higher ripple frequency is a reduced requirement on the LC filter size; this results in a lower source impedance as seen by the output stage. Apples to apples, three phase rectification results in lower peak-to-peak ripple.

Side note
To really get deluxe in the European DIY community, ...result in a 12 pulse rectifier. Now we're talking increasing our rectifier ripple to 600 Hz. Heck, take it another step with zigzag windings, and you can get out to 1200 Hz. As nice as this seems, the cost and weight of the iron just isn't worth the cost of a capacitor.
I think he means the response of the cap, not the general electron flow. Some people claim smaller caps respond quicker to dynamics...

I agree the cost of such a system just doesnt make up for it. Tho for the sake of going beyond, go for it...
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Old 1st December 2010, 11:45 AM   #22
imix500 is offline imix500  United States
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Actually, speaker arrays are getting more and more efficient. Considering the output capabilities of your average amp rack for those systems, they don't really waste that much energy at idle. Things get even better if those arrays are self powered and the amp modules have been designed for the cabinet they are in. Also, unless you are hosting DJ Tiesto or the like the average power consumed isn't that high.
Lighting is getting better too. Very few if any large acts are using hundreds of 1k par cans anymore. That's a bit 1980's to most. LED fixtures, LED video walls, more efficient ballasts for the HID lamps in intelligent fixtures and large video projectors, and the use of video driven LED based fixtures as part of the lighting design have notably cut down on power consumption.
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Old 1st December 2010, 03:37 PM   #23
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zigzagflux

the motor ran a hollow drum at 5000RPM. The outside of the drum was a negative with 132 rows of characters on the negative. Inside the drum was a bank of strobe lamps. When the right character was in front of the right strobe lamp the lamp would flash and project an image of the character to a print drum and voila! electronic printing. Long before laser printing. Oh yeah, only one character set, only landscape, only single sided, only 20lb paper, only 8 1/2 by 11inch paper and no graphics.
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Old 1st December 2010, 03:49 PM   #24
dmills is online now dmills  United Kingdom
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The subtle point with modern lighting is that while something like the "Bomber rig" switched banks of lanterns so only part of that massive number of parcans was on at any one time, the modern discharge stuff is struck at the start and runs continuously right through.

Lighting is still the power consumption king.

Now 208 or 220 split phase possibly makes sense in the US because of the massive weight savings, less current means less voltage drop and the higher voltage means that a given voltage drop matters less to start with, but I don't see genuine three phase input amps ever really being a mass market product.

Regards, Dan.
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