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Registered Member #2115
Joined: Fri May 08 2009, 01:17PM
Location: Singapore
Posts: 46
Hi,
Since the MMC is connected in series with the primary of a DRSSTC then to the outputs of the H-bridge, why are high voltage bleeders across the MMC needed when a lower voltage resistor could just be placed across the H-bridge (upon power off, they will effectively be in series with the caps).
Registered Member #480
Joined: Thu Jul 06 2006, 07:08PM
Location: North America
Posts: 644
kiat -
In a string of series-connected capacitors, it's possible for individual capacitors to remain charged, even though the "ends" of the string are shorted by a transformer winding or other bleed path. An individual bleeder resistor across each cap is the only way to absolutely guarantee that each individual capacitor is discharged. This is probably more of a concern in a spark-gap coil, where tank voltages are generally higher than in a solid-state coil.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Hi kiat,
the bleeders don't really do anything but provide a conformal safety of knowing every cap in the string discharges after power is off, though unless some of the caps fail open or short or get drastically reduced capacitance, a single resistor across entire bank will work just as well.
In large MMC banks putting resistors over every cap may prove more nuisance than use.
Registered Member #2115
Joined: Fri May 08 2009, 01:17PM
Location: Singapore
Posts: 46
Ok, I understand. So bleeders are really not needed unless you want each and every cap to be fully discharged (as opposed to the MMC's terminals) after use.
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MMC Bleeders for DRSSTC
