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Registered Member #538
Joined: Sun Feb 18 2007, 08:33PM
Location: Finland
Posts: 181
I've always understood that one of the main things in having a resistor over every cap is to make sure every cap is discharged, if you have a resistor over the whole bank then invidual caps can still hold a charge.
Banned on 3/17/2009. Registered Member #487
Joined: Sun Jul 09 2006, 01:22AM
Location:
Posts: 617
Yeah I think the balancing thing would only apply to resistors across your DC buss not an MMC. Across the whole thing is probably just for safety. I dont use them anymore.
Registered Member #480
Joined: Thu Jul 06 2006, 07:08PM
Location: North America
Posts: 644
The main argument for bleeder resistors across each cap in a series string is that "isolated" caps in the center of a string can still retain a charge, even though the entire string is paralleled by a single resistor across the ends of a string. With a single resistor across the entire string, the net voltage across the MMC terminals may be zero, but individual caps may still be charged. When each cap is shunted by its own resistor, no "floating charges" can remain.
Since Dr. Spark's entire MMC is enclosed, its unlikely that anyone is at risk from putting their fingers across a single "isolated" cap in the middle of the string.
I think the "voltage equalizing" aspect was debunked quite a while ago. I think it may have been Gary Lau who demonstrated that given the time constant of a typical MMC capacitor and a 10 meg resistor, and the typical operating frequency of a TC tank circuit, that any voltage equalizing between individual caps in a string would be minimal.
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