Continue to Site

Welcome to our site!

Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Battery charger help!

Status
Not open for further replies.

Noah_swann

New Member
Hi all, I'm hoping you can help me out in fixing my dads old battery charger (Century 60amp 6/12v) that is circa 40 years old!

I have ascertained that the rectifier is the problem as I have 31V AC from the two wires going into the rectifier plate from the transformer, but 0.6V DC coming out. I'm aware that having 2x 6 diode plates is old school and is relatively obsolete and expensive to repair (Century have a pack of 4 diodes for $23). What can I use to bring it kicking and screaming into the 21st century and how would I go about wiring it in? (Bearing in mind I've not been involved with electronics since my high school days some 18 years ago, so I'm fairly rusty!)

If it makes any difference, I'm in the UK so the unit has 230v input.

Thanks in advance for any advice!

(Apologies if I've posted in the wrong section!)
 
31 volts is rather a lot for a 12v battery charger.
This could be a bi-phase rectifier, rather than the more common bridge rectifier.

Pictures of the insides would help.
A schematic diagram would be even better.

JimB
 
Many thanks for getting back to me so quickly! I've attached a pic of the rectifier as it currently sits out of the unit. The 2 wires from the transformer were connected to the studs on top of each set of diodes with the output connected to the bolt on the base plate, which went via a voltmeter on the front of the unit to the battery clamp. I have some pics of it in the unit but are too large to upload so I'll resize them and add them later if needed.

Adam.
 

Attachments

  • 20190127_182410.jpg
    20190127_182410.jpg
    1.2 MB · Views: 226
2x 6 diode plates
Are you sure about the 6 diodes? It looks to me like there are only 2 diodes. I'd guess those big circular plates are selenium rectifiers each sitting on 6 insulators.
 
I'd guess those are standard silicon diodes. If so, be aware that for a given current a silicon diode will drop less voltage than a selenium rectifier plate, so you may need to add some series resistance to compensate.
 
Status
Not open for further replies.

Latest threads

New Articles From Microcontroller Tips

Back
Top