scr application

[georgetwo]

I was reading a book on scr, one application of scr i dont know about is: how to use scr as a battery charger. Can any body pls help me with the circuit diagram or an explanation on how it works? I still need to know how to apply scr for a.c friquency controller. Thanks

 

[crutschow]

An SCR is typically use to turn on an AC waveform. It then automatically turns off when the waveform goes to zero. It can be used with a phase controlled gate signal to turn on at a particular point on each cycle to control the output voltage, which is how an SCR battery charger operates.

Using an SCR as an a.c. frequency controller requires a complex circuit (Google "cycloconverters").

 

[Hero999]

It's really too much of a vague question.

An SCR is just a switch that remains on once it's been triggered. A battery charger normally has a linear amplifier which either controls the voltage or current. I wouldn't expect to see an SCR used in a battery charger and certainly wouldn't used one if I were designing it but I wouldn't be surprised if there's a cheap Chinese charger which uses one.

 

[KMoffett]

Many yeas ago I built a lead acid battery charger who's pass-element was an SCR. It was straight out of an early GE SCR Data Manual. Used it for many years. If I could find the manual I'd post it, but I think its long gone.

Ken

Added: I recalled that this came up once before on another Forum and another poster came through with it : https://forum.allaboutcircuits.com/showpost.php?p=103339&postcount=10

 

[crutschow]

An SCR is just a switch that remains on once it's been triggered. A battery charger normally has a linear amplifier which either controls the voltage or current. I wouldn't expect to see an SCR used in a battery charger and certainly wouldn't used one if I were designing it but I wouldn't be surprised if there's a cheap Chinese charger which uses one.

It may not be appropriate for a small NiMH or Li ion battery charger but it makes a simple, high efficiency charger for automobile lead-acid batteries.