about the relationship between the ripple current and direct current of the capacitor

[[email protected]]

hello everyone:
I have a inquiry about the ripple current and direction current of the
electrolytic capacitor.
in the inverter ,6-pulse rectifier.
according to the power, the direct current can be calculated,
and then how to get the value of the ripple current in order to select
the electrolytic capacitor?
thanks

 

[Rene Tschaggelar]

hello everyone:
I have a inquiry about the ripple current and direction current of the
electrolytic capacitor.
in the inverter ,6-pulse rectifier.
according to the power, the direct current can be calculated,
and then how to get the value of the ripple current in order to select
the electrolytic capacitor?

A model with source impedance plus some
diode and capacitor parameters is the way to go.
Calculate one pulse at staedy state conditions
and give some slack for the power up.

Rene

 

[Ian Bell]

hello everyone:
I have a inquiry about the ripple current and direction current of the
electrolytic capacitor.
in the inverter ,6-pulse rectifier.
according to the power, the direct current can be calculated,
and then how to get the value of the ripple current in order to select
the electrolytic capacitor?
thanks

A little bit of math will do the trick. To a first approximation you can
use:

C*dV = I.dt

Where C is the smoothing cap. I is the load current and dt is the pulse
period.

ian

 

[Don Lancaster]

A little bit of math will do the trick. To a first approximation you can
use:

C*dV = I.dt

Where C is the smoothing cap. I is the load current and dt is the pulse
period.

ian

The simple full wave rule of thumb is easily modified for six pulse:

In an 8300 microfarad capacitor, the amps of current equals the volts of
ripple at 60 Hertz x 2.



--
Many thanks,

Don Lancaster voice phone: (928)428-4073
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
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