DC/TO/DC converter problems!

Hey all!


I have a DC/DC converter that I bought a week ago.
What im doing is using it in some project, using a battery as the power supply and the converter as a step up transformer and sometimes a stop down.

Problem is when i use the converter to power a small DC motor, it works for a few seconds and just stops! and i try to connect it again dosen't work.
On the converters board there is a small red LED that indicates the power!

When i connect the battery it lights up, i connect the output with a higher voltage from 12volts/IN to 13 -16/DC volts/OUT to the motor the LED light fades away slowly and the motor stops.

I said to myself their could be a problem with the charge or something... So I used a capacitor at 16 volt 2200 MicroFarads and a 3 AMP diode following this diagram exactly!:





So what really is the problem here? Im trying to power the DC motor using this converter all details in the link:

**broken link removed**


And the DC/Motor type and specs:

**broken link removed**


I say that there's a im not sure what they call it in the "electric world" im kinda new it :???: I think there a BACKFIRE of current maybe it flowing back to the capacitor or something?

*Note: I connected everything correctly interms of the + AND THE - terminals, I need to use the converter in this project it a MUST.
+ I used more than one type of converter with similar spec's still has the same problem. + The power supply is perfect no problems with it at all.

Dear Moha
Hi
The problem seems simple !
Did you use a flyback diode in parallel with your motor ?
How much is the maximum out put of your supply ?
And what are the specifications of your motor ?
best Wishes
Goldsmith

goldsmith said:

Dear Moha
Hi
The problem seems simple !
Did you use a flyback diode in parallel with your motor ?
How much is the maximum out put of your supply ?
And what are the specifications of your motor ?
best Wishes
Goldsmith

Click to expand...

I used a 1AMP 4001 diode exactly the same way the diagram image uploaded shows! Im not really familiar with a flyback diode really....
The output voltage is adjustable I would set it between 13.5 to 14.5volts/DC it depends.
I used the schematic showen above in the picture.

Motor specs:


Volts Current Rpm with no load (measured with scope)

2v 118ma 1176
3 128 1935
4 133 2727
5 139 3409
6 145 3896
7 147 4545
8 150 5769
9 153 6315
10 155 7142
11 150 7894
12 158 8571
13 158 9523
14 157 10169
15 160 11538
16 168 12000
17 168 13043
18 170 13333


there is a link showing you exact details above if you need more details

Thank you for everything so far!

Check out the links to get a good image of what im dealing with.

Again Hi
My mean by flybcak diode was this :
Do you know about lenz law ? each inductor , will have opposition , against instantaneous currents . and the inductor don't want allow to change the situation .
If your inductor has current , and when you cut the current of that , it will try to keep that current and will create high voltage at reverse polarity (linear torque ) or ( inertia ). and i think those reverse voltages are cause of your problem . and if you use a simple diode in parallel with your motor ( at reverse biasing ) , i think the problem will solve .
VL=L*di/dt (lenz law)
Good luck
Goldsmith

goldsmith said:

Again Hi
My mean by flybcak diode was this :
Do you know about lenz law ? each inductor , will have opposition , against instantaneous currents . and the inductor don't want allow to change the situation .
If your inductor has current , and when you cut the current of that , it will try to keep that current and will create high voltage at reverse polarity (linear torque ) or ( inertia ). and i think those reverse voltages are cause of your problem . and if you use a simple diode in parallel with your motor ( at reverse biasing ) , i think the problem will solve .
VL=L*di/dt (lenz law)
Good luck Goldsmith

Click to expand...

Well thats amazing! Could you show me a diagram on how this can be done.
Based on my diagram here:

It is simple . connect the cathode of your diode (e.g 1N4007) to the positive side of capacitor and the anode to ground .
Best Lucks
Goldsmith

goldsmith said:

It is simple . connect the cathode of your diode (e.g 1N4007) to the positive side of capacitor and the anode to ground .
Best Lucks
Goldsmith

Click to expand...

Sure, I'll try this out but did you see my picture digram? Is it like that?