Hi,
I've been reading about the e-choke designs, for example:
What is a "Electronic Choke"
When using a normal choke (coil) we use a high capacity capacitor before and after the choke.
If the e-choke is not very fast, why not add another high capacity capacitor AFTER the e-choke?
Regards, Gerrit
I've been reading about the e-choke designs, for example:
What is a "Electronic Choke"
When using a normal choke (coil) we use a high capacity capacitor before and after the choke.
If the e-choke is not very fast, why not add another high capacity capacitor AFTER the e-choke?
Regards, Gerrit
E-Choke may, like E-Cigarette, be rather a trade name than description of an electrical equivalent.
An important characteristic of a choke is that it can store (magnetic) energy. Try to disconnect a real choke with good current running in it and you will see hazard. This small fellow, the E-Choke, cannot store much energy and cannot be used, for instance, in a Buck converter.
De facto, it is a ripple filter based on what I have heard being called a capacitance multiplier. The similarity, judged from euro21's diagram, with Juma's Easy Peasy Capacitance Multiplier is striking.
This means, the E-choke is not used as the choke in a PI-filter.
The E-Choke, as other ripple filters designed as source followers, should be rather fast in step response seen from the output. Then, a large output capacitor is not needed. A smaller low ESR capacitor should be sufficient.
Could it be that it is slow in reacting to input voltage variations, not output changes?
I believe that gerittube is right in that charging a large capacitance at the output during startup can cause some nasty surge currents.
An important characteristic of a choke is that it can store (magnetic) energy. Try to disconnect a real choke with good current running in it and you will see hazard. This small fellow, the E-Choke, cannot store much energy and cannot be used, for instance, in a Buck converter.
De facto, it is a ripple filter based on what I have heard being called a capacitance multiplier. The similarity, judged from euro21's diagram, with Juma's Easy Peasy Capacitance Multiplier is striking.
This means, the E-choke is not used as the choke in a PI-filter.
The E-Choke, as other ripple filters designed as source followers, should be rather fast in step response seen from the output. Then, a large output capacitor is not needed. A smaller low ESR capacitor should be sufficient.
Could it be that it is slow in reacting to input voltage variations, not output changes?
I believe that gerittube is right in that charging a large capacitance at the output during startup can cause some nasty surge currents.
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