 Why a diode in Anti-parallel, and not series?
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Inducktion
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Thu Nov 10 2011, 04:03AM
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Registered Member #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
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Is there any particular reason behind it? Or is it because of the inductor = voltage needs to go somewhere thing?
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Saz43
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Registered Member #1525
Joined: Mon Jun 09 2008, 12:16AM
Location: America
Posts: 294
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Current and voltage are 90 degrees out of phase in an RLC circuit. Blocking reverse current (which the SCR already does in most designs) will not protect your capacitors- voltage goes negative during forward current, and max negative voltage occurs when current is zero.
The solution is to prevent a reverse charge from building up across the capacitor with an anti-parallel diode. You can also think of it as bypassing the capacitor after it reaches zero volts and switching to an RL circuit.
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