# Parallel Resonance

5 replies to this topic

Intermediate Member

• Members
• 11 posts

Posted 06 September 2005 - 06:11 AM

Hi, What does the Parallel Resonance in the filter harmonics term mean, and how to detect them.

### #2 marke

marke

Posting Freak

• Moderator
• 2,651 posts
• Gender:Male
• Location:Christchurch, New Zealand

Posted 06 September 2005 - 07:02 PM

When ever you have a combination of capacitance and inductance, you have a resonant circuit. The resonant frequency is a function of the inductance and capacitance. The formula is commonly available but a little hard to quickly add here.

If the inductance and capacitance are in parallel, you have a parallel resonant circuit. If the shunt resistance is high (High impedance suppy), the Q factor is also high and the resonant circuit will ring if excited by transients or harmonics close to the resonant frequency.

It is common for supply resonance to occur, made up of the power factor correction capacitance and the inductance of the supply.

Best regards,

Intermediate Member

• Members
• 11 posts

Posted 07 September 2005 - 12:29 AM

Hi, marke can you send me about the formula to define the parallel resonance to my email: tabirsurya@yahoo.com?

Thank's

### #4 bob

bob

Member

• Full Member
• 187 posts
• Gender:Male

Posted 07 September 2005 - 04:04 AM

Any decent electrical enginering handbook will give you the formula for resonance.

Regards.

Bob

Intermediate Member

• Members
• 11 posts

Posted 07 September 2005 - 04:59 AM

Dear bob,

Yes, I have found the formula but I don't understand about that. I mean, I don't know how the parallel resonance in the actual electrical circuit. Did the resonance cause the voltage will be increase or decrease? And I don't know how to define Q factor of the circuit.

Regards.

### #6 bob

bob

Member

• Full Member
• 187 posts
• Gender:Male

Posted 07 September 2005 - 05:34 AM