TP4056 charging module and DC Motor

Thread Starter

isagollo

Joined Feb 20, 2021
15
Hi, everyone!

Could someone give me hand with this situation? Every time I connect a DC MOTOR R140 (see specs below) in parallel with my Lithium Battery 3.7V 2000mAh ( that is connected to the TP4056 charging module) the voltage goes to 0V - I believe this must be from the short-circuit protection IC - What can I do to solve this problem? I believe it must be some resistor to change it - what value it should be to match the motor current specification?

motor_specs.jpeg
 

wayneh

Joined Sep 9, 2010
17,153
Does the battery voltage go to zero when it is directly connected to the motor? I mean with no confusion with the charge module, just the battery and the motor. Do you have a 5V power supply you can use to test your motor?
 

LowQCab

Joined Nov 6, 2012
1,110
Did the Motor work good one time, and now it doesn't work ?
It is possible that the RFI-Hash that a Brushed-DC-Motor puts out could have
fried your Battery-Protection-Circuit.

A Ceramic-Capacitor across the Motor Terminals may prevent this with your next New Battery.
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Thread Starter

isagollo

Joined Feb 20, 2021
15
Did the Motor work good one time, and now it doesn't work ?
It is possible that the RFI-Hash that a Brushed-DC-Motor puts out could have
fried your Battery-Protection-Circuit.

A Ceramic-Capacitor across the Motor Terminals may prevent this with your next New Battery.
.
.
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It worked once and it stopped. I measured 0V with the multimeter in the ic output and after I waited for a while it only worked when I connected a LED instead of the dc motor. The DC motor and the battery is fine. I believe that must be something due to the resistor value in the ic (short-circuit current or something like this). What value and voltage specifications for the Ceramic-Capacitor I should use?
 

LowQCab

Joined Nov 6, 2012
1,110
Your Capacitor selection will depend on the characteristics of the Motor.
More Current, and Higher Voltages, will
create Higher Voltage, and Higher Current, "RFI-Hash".

As far as I know, there are no definite, exact, formulas for selecting the Capacitor(s).
Since you have a Low-Voltage Battery-Powered project,
the Capacitor Voltage Ratings will be lower.
I would "suggest" that you select a Voltage-Rating at least 5-X,
and maybe even up to 10-X, of the normal operating Voltage of the Motor.

The Capacitance "Values" don't change with Voltage or Current.
Ceramic Capacitors have a "Frequency-Response-Curve",
they do not respond in a completely Linear fashion to changes in Frequency
like you might expect,
so, a selection of various Capacitance Values in parallel is called for.
This will cause their individual Frequency Response curves to "over-lap" each other,
making sure that all, ( or most ), RFI Frequencies are suppressed.

Many Ceramic Capacitors will show you what
this Frequency Response Curve looks like in their Data-Sheet.

With Ceramic Capacitors, you get what you pay for.
Expensive Ceramic Capacitors almost always give superior performance.

The Cost difference can be easily seen when you start comparing the different "Ratings".
The ones you want are designated : COG / NPO,
They have the greatest stability under changes in Temperature, and, DC-Bias-Voltage Changes.
Check out this Generalized Temperature Graph ............
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.Ceramic Properties .PNG


There are also Graphs that show the changes caused by DC-Voltage to the Capacitance Values

This is a General generic application of Ceramic Capacitors used on
the Power-Supply-Rails of an Op-Amp, to prevent Oscillations.
Notice how the Values are radically different, to cover the widest range of Frequencies .......
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.IC Bypassing .PNG

Your needs are not quite so demanding,
and just the 330nf, and 10nf, across your Motor-Leads will "probably" do the trick.
But there are few guarantees that can be made.
And sometimes the frequencies can get so high, ( Ghz Range ), that they will not
show-up on an inexpensive Oscilloscope.

This is one of the HUGE advantages of "Brush-less" Motors, they don't create "RFI-Hash" .
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