 Decoupling caps
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Dr. Dark Current
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Mon Mar 10 2008, 05:31PM
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Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
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Sorry, I have a lot of questions lately 
Let's say I have two electrolytic caps of the same value in series, to filter a supply voltage to a half bridge inverter. Now, can I just connect the load between the bridge output and the "center point" of the caps, without decoupling caps? I heard some people talking against it but I can't really see any problems.
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Dr. Slack
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Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
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Yes.
However, you may need to make sure your load only draws AC, as the capacitor mid point cannot source DC long term. Start with the drive 50% mark/space, although small imbalances in the top and bottom power elements will still result in a small imbalacne. You could servo the drive m/s ratio to keep the capacitor mid point voltage at mid rail. Or use very stiff bleeder resistors across the caps to source any small amount of DC that the load takes.
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