Charging cap with three phase

[Andrew Borg]

Sir I need to charge a capacitor with three phase generator. Did three diode bridge but not charging. Any clue pls?
Thks

 

[duke37]

Draw out your circuit.
Three diodes will need a four wire drive.
Six diodes in a bridge can operate without the common wire.

 

[Andrew Borg]

Hi duke37 you're right I meant six diodes regarding the bridge. I connected the three wires coming out of the generator to the middle of those six diodes but cap not charging.

 

[Hunter64]

Draw out your circuit!

 

[bertus]

Hello,

Have a look at this page:
https://www.electronics-tutorials.ws/power/three-phase-rectification.html

Bertus

 

[duke37]

Draw out your circuit.
Disconnect the bridge,
Measure the resistance between the alternator outputs. Three readings.
Measure the output voltage between the three alternator outputs when running. Three readings.

Measure the resistance or voltage drop of each diode at both polarity. Twelve readings.
If one reading is different to the rest, disconnrct one end and measure it on its own.
Measure voltage drop across the bridge at each polarity. Two readings.

 

[Andrew Borg]

Draw out your circuit!

Hello,

Have a look at this page:
https://www.electronics-tutorials.ws/power/three-phase-rectification.html

Bertus

Draw out your circuit.
Disconnect the bridge,
Measure the resistance between the alternator outputs. Three readings.
Measure the output voltage between the three alternator outputs when running. Three readings.

Measure the resistance or voltage drop of each diode at both polarity. Twelve readings.
If one reading is different to the rest, disconnrct one end and measure it on its own.
Measure voltage drop across the bridge at each polarity. Two readings.

Thanks guys for response here is my circuit but capacitor not charging don't know why is this??!!!

 

[bertus]

Hello,

Can you measure the AC voltage between the phases?

Bertus

 

[Andrew Borg]

Hello,

Can you measure the AC voltage between the phases?

Bertus

Depends how much generator is spinning but measured it all giving same voltage.
About 12vac
On bridge about 18v

 

[bertus]

Hello,

What capacitor do you use?
You have given no information on that.

Bertus

 

[Andrew Borg]

Hello,

What capacitor do you use?
You have given no information on that.

Bertus

I am trying many but not one is holding charge. Is it maybe frequency problem??
Cannot understand why.

 

[bertus]

Hello,

You say you have tried several capacitors.
What where the values of them?
Is there a load accross the capacitor?
Depending on the load, the capacitor will be drained sooner or later.

Bertus

 

[duke37]

Unless youu have a very sophisticated meter, it will discharge the capacitor. To get a significant discharge time you will need a large electrolytic capacitor and a meter with 10M input resistance.

 

[Andrew Borg]

Hello,

You say you have tried several capacitors.
What where the values of them?
Is there a load accross the capacitor?
Depending on the load, the capacitor will be drained sooner or later.
Bertus

No I tried with no load

Unless youu have a very sophisticated meter, it will discharge the capacitor. To get a significant discharge time you will need a large electrolytic capacitor and a meter with 10M input resistance.

I used it on other capacitor without problem.

 

[crutschow]

I am trying many but not one is holding charge

What do you mean "not one is holding charge"?

 

[Martaine2005]

The OP never returned to this thread.
Two years too late!

Martin

 

[Harald Kapp]

Aargh. One should start reading a thread from the beginning,

 

[Minder]

The OP never returned to this thread.
Two years too late!

Martin

He'd depleted all his 'spent' up energy!

 

[davenn]

deletion and tidy up

Thread closed