Can some kind of LC circuit conduct constant AC current ?

[The Electrician]

The OP asked for a passive circuit consisting of Ls and Cs to provide a constant current to a load. The examples in Steinmetz's book give an answer.

Since the load current is only 15 mA, a relatively small inductor of about 25 henries is not totally out of the question. However, such an inductor would have to be wound with a lot of turns of little wire and the losses would be considerable.

The OP never did reveal his purpose. Maybe it was just an academic exercise. As a practical matter some other technique that might be a little lossy would probably do.

 

[MrAl]

Hello again,


Yes even my transformer times 2 circuit isnt as practical as i would like it to be. The upper transformer ratio has to be high enough to get good regulation, which puts it probably around a 1:50 ratio or better. That means we might need to use a 240vac transformer with 5vac output, backwards, and maybe a means to protect the 5v winding from overcurrent. So i figure it would be best for light currents only.

 

[MOR_AL]

1 - Constant Voltage, Current, and Power: A Circuit for All Reasons - Derek A. Paice - IEEE Transactionson industrial Electronics and Control Instrumentation , Vol. IECI - 25, NO. 1, FEB. 1978 - pg 55.
2 - The Derivation and Application of Design Equations for Ferroresonant Voltage Regulators and Regulated Rectifiers. - Harry P. Hart and Robert J. Kakalec. - IEEE Transactions on Magnetics, Vol. MAG-7, NO. 1, March 1971.
3 - Standard Handbook for Electrical Eng. - Fink and Beatu - pg. 10-106 to 10-109.
4 - The Geometry of Regulating Transformers - Nathan R. Grossner - IEEE Transactions on Magnetics, Vol. MAG-14, NO. 2, March 1978.

The first one shows how the same circuit may be used as Constant voltage, current or Power.
The second has some useful informations.
MOR_AL

 

[MrAl]

1 - Constant Voltage, Current, and Power: A Circuit for All Reasons - Derek A. Paice - IEEE Transactionson industrial Electronics and Control Instrumentation , Vol. IECI - 25, NO. 1, FEB. 1978 - pg 55.
2 - The Derivation and Application of Design Equations for Ferroresonant Voltage Regulators and Regulated Rectifiers. - Harry P. Hart and Robert J. Kakalec. - IEEE Transactions on Magnetics, Vol. MAG-7, NO. 1, March 1971.
3 - Standard Handbook for Electrical Eng. - Fink and Beatu - pg. 10-106 to 10-109.
4 - The Geometry of Regulating Transformers - Nathan R. Grossner - IEEE Transactions on Magnetics, Vol. MAG-14, NO. 2, March 1978.

The first one shows how the same circuit may be used as Constant voltage, current or Power.
The second has some useful informations.
MOR_AL

Hello there,

About your third reference there #3, what edition was that? Was that an old edition perhaps?

 

[MOR_AL]

Hello there,

About your third reference there #3, what edition was that? Was that an old edition perhaps?

Sorry.
I don’t have more information. Certainly it is an old edition.
MOR_AL