DC/DC Voltage Conversion | on ElectriciansForums

Discuss DC/DC Voltage Conversion in the UK Electrical Forum area at ElectriciansForums.net

xpistos

DIY
Joined
Sep 28, 2023
Messages
10
Reaction score
3
Location
West midlands
Hi Guys,

Looking for a bit of advice for my kids power wheel car.

I have a 24v to 12v converter which I need to use for the steering motor as its still 12v. Currently the controller has 2 wires which connect to the steering motor, the polarity of the wires switches to turn either left of right.

With the polarity switching am I still able to use a regular dc/dc converter?

Thanks

Chris
 
Random idea, but could you use two of the voltage converters, each protected with an appropriate polarity beefy diode in front as a sort of 'or' gate, making one converter for each polarity, then combining the outputs after an appropriate polarity diode on each output. A little bit of voltage drop, but it might work?
Or maybe some sort of dropper? What 12V current are you dealing with?
 
Last edited:
As long as the startup time for the regulator is longer than any capacitor on the output that might be a good idea , or a large power resistor roughly equivalent to the resistance of the load.
Trouble is the load is a motor (might even be the traction motors?) so I thought a purely resistive dropper would not be appropriate the varying mechanical load (meaning a varying electrical load!).
High power zeners (equivalent) on a huge heatsink??!!
 
Or another way using 24V coil and suitable contact rating relays, and a single 24 to 12V regulator.

Pair of relays (as below) driven from the 24v, one via diode one way round, other via diode the other way round, so with +24V one relay operates, and with -24V the other operates.
The 12V regulator output connected to the +/- input to the relays as per the article below!

 
I'll be honest that's all way over my head! Looking into it further its more complicated then I thought. After tuning with the remote an opposite voltage is sent via the controller unit to recentre the wheels. This voltage actually steps down gradually from +-24v to 0v, once the voltage drops below +-12v the converter does nothing anyway and the wheels get stuck left or right.

Think the easiest solution will be to find a 24v motor for the steering and go from there

Thanks for all the advice regardless
 
This might seem like a daft idea, but bear with me.

the original motor is probably rated at 24v continuous rating, if it is only used on and off for steering it has a duty cycle of less then 10% by my estimate.

the thing that kills motors is hear build-up, so just leave the original motor in place and over supply it with 24v and odds are all will be fine. worst case is the motor dies and you have to replace it (what you are looking at doing anyway?)
 

Reply to DC/DC Voltage Conversion in the UK Electrical Forum area at ElectriciansForums.net

Similar threads

  • Question
I was suspicious that your MH-CD42 was not producing sufficient voltage under load for the PWM controller. If you have a multimeter you could...
Replies
4
Views
962
Hello again everyone, it's been a while and I have not had a great deal of time on this project but hear is where it's at. I had one in the office...
    • Like
2
Replies
26
Views
2K

OFFICIAL SPONSORS

Electrical Goods - Electrical Tools - Brand Names Electrician Courses Green Electrical Goods PCB Way Electrical Goods - Electrical Tools - Brand Names Pushfit Wire Connectors Electric Underfloor Heating Electrician Courses
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc

YOUR Unread Posts

This website was designed, optimised and is hosted by untold.media Operating under the name Untold Media since 2001.
Back
Top