Use PWM to control your Jebao DCT pump using brushless motor controller from ebay

If it's generating less power drive, is it a frequency mismatch maybe? Then a fix could be changing a timing resistor/cap?

What are the other control variables?

The FETs can handle it, so... there's got to be a path forward.
 
the board I got is marked JYQD_V6.3E1
and I can't find any other version for this board.
I know there is a version of this board for motors with hall sensors and that won't work with the jebao pumps. The LM339 chip is missing from the board.

The board is advertised as used in electric scooters and bikes.

The speed is proportional to voltage/pwm. I checked the commutation signal with pwm connected to 5v, and I still see pwm like signal. I think that is reducing the output voltage. I'll check the BEMF circuit, maybe later this week, to see if I can find anything.
 
Last edited:
The standard driver circuit, as per datasheet looks like this

IR2101-circuits.jpg


I found an article with a slightly modified circuit (but using IR2110).

IR2110+-+2.png


It should not be hard to solder a 1k resistor between the Gate and Source of all 6 MOSFETS. Adding the diode might be a little bit trickier as you need to solder to SOP-8 smd pin. I will try adding the 1k resistor. I won't be able to do it till later this week.
 
d0ughb0y said:
the board I got is marked JYQD_V6.3E1
and I can't find any other version for this board.
I know there is a version of this board for motors with hall sensors and that won't work with the jebao pumps. The LM339 chip is missing from the board.

The board is advertised as used in electric scooters and bikes.

The speed is proportional to voltage/pwm. I checked the commutation signal with pwm connected to 5v, and I still see pwm like signal. I think that is reducing the output voltage. I'll check the BEMF circuit, maybe later this week, to see if I can find anything.
Click to expand...

Mine has the same marking
 
I wanted to document the Apex connections and clean up the overall design outside the board

<a href="http://s1062.photobucket.com/user/karimwassef/media/0_zpsye5ajie2.png.html" target="_blank"><img src="http://i1062.photobucket.com/albums/t496/karimwassef/0_zpsye5ajie2.png" border="0" alt=" photo 0_zpsye5ajie2.png"/></a>

with color coding to make it easier for others to do the same.

My VDM was outputting 0-10.8VDC so I needed to modify the resistor divider network to get exactly 0-5VDC (as close as I could). I checked it with two different multimeters and it's real.

Here is the resulting APEX programmed input (0-100) and measured VDC

<a href="http://s1062.photobucket.com/user/karimwassef/media/1_zpss5qyrcua.png.html" target="_blank"><img src="http://i1062.photobucket.com/albums/t496/karimwassef/1_zpss5qyrcua.png" border="0" alt=" photo 1_zpss5qyrcua.png"/></a>

Here are some pics of the connections

<a href="http://s1062.photobucket.com/user/karimwassef/media/IMG_6317_zpswgdrdwda.jpg.html" target="_blank"><img src="http://i1062.photobucket.com/albums/t496/karimwassef/IMG_6317_zpswgdrdwda.jpg" border="0" alt=" photo IMG_6317_zpswgdrdwda.jpg"/></a>

<a href="http://s1062.photobucket.com/user/karimwassef/media/IMG_6320_zpszlvm9xtn.jpg.html" target="_blank"><img src="http://i1062.photobucket.com/albums/t496/karimwassef/IMG_6320_zpszlvm9xtn.jpg" border="0" alt=" photo IMG_6320_zpszlvm9xtn.jpg"/></a>

<a href="http://s1062.photobucket.com/user/karimwassef/media/IMG_6321_zps1vsnon1i.jpg.html" target="_blank"><img src="http://i1062.photobucket.com/albums/t496/karimwassef/IMG_6321_zps1vsnon1i.jpg" border="0" alt=" photo IMG_6321_zps1vsnon1i.jpg"/></a>

<a href="http://s1062.photobucket.com/user/karimwassef/media/IMG_6322_zpsatw0kh4f.jpg.html" target="_blank"><img src="http://i1062.photobucket.com/albums/t496/karimwassef/IMG_6322_zpsatw0kh4f.jpg" border="0" alt=" photo IMG_6322_zpsatw0kh4f.jpg"/></a>
 
d0ughb0y said:
The standard driver circuit, as per datasheet looks like this

IR2101-circuits.jpg


I found an article with a slightly modified circuit (but using IR2110).

IR2110+-+2.png


It should not be hard to solder a 1k resistor between the Gate and Source of all 6 MOSFETS. Adding the diode might be a little bit trickier as you need to solder to SOP-8 smd pin. I will try adding the 1k resistor. I won't be able to do it till later this week.
Click to expand...

Is the idea that the 1K will improve the commutation timing to get more throughput power?
 
I think I'll add a small wire connection to the gate first and then wire the 1K to that.

Eh - it's a $12 board and there's two more on the way. If it doesn't work, at least we'll know.
 
Here's a closer look at the Ethernet resistor network

<a href="http://s1062.photobucket.com/user/karimwassef/media/karimwassef001/0_zps4gjnlhly.png.html" target="_blank"><img src="http://i1062.photobucket.com/albums/t496/karimwassef/karimwassef001/0_zps4gjnlhly.png" border="0" alt=" photo 0_zps4gjnlhly.png"/></a>

If I could go back, I'd get a 1K-10K pot instead of measuring and stringing resistors.
 
karimwassef said:
I think I'll add a small wire connection to the gate first and then wire the 1K to that.

Eh - it's a $12 board and there's two more on the way. If it doesn't work, at least we'll know.
Click to expand...

All you need to do is solder 1k to pins 1 and 3 of each MOSFET. You can do it either on top side or bottom side. The resistor is to prevent surge current. The diode is for faster discharge of the FET capacitance, or something like that. In the above circuit, the mosfet gate resistor is 10 ohms, the one on the green board is 510ohms. Perhaps the value may be too high, so I think the diode could make a difference.

I think that's about all you can do with the driver circuit.

I have to check the back emf feedback circuit.
 
karimwassef said:
Here's a closer look at the Ethernet resistor network

<a href="http://s1062.photobucket.com/user/karimwassef/media/karimwassef001/0_zps4gjnlhly.png.html" target="_blank"><img src="http://i1062.photobucket.com/albums/t496/karimwassef/karimwassef001/0_zps4gjnlhly.png" border="0" alt=" photo 0_zps4gjnlhly.png"/></a>

If I could go back, I'd get a 1K-10K pot instead of measuring and stringing resistors.
Click to expand...

The image got corrupted. Here it is again:

<a href="http://s1062.photobucket.com/user/karimwassef/media/0_zps4gjnlhly.png.html" target="_blank"><img src="http://i1062.photobucket.com/albums/t496/karimwassef/0_zps4gjnlhly.png" border="0" alt=" photo 0_zps4gjnlhly.png"/></a>
 
I'm in the process of setting up a flow meter to measure flow. Just waiting on my signal converter to come in. Once I have that, I can test flow rates fairly easily.
 
karimwassef said:
would this controller not work without the hall sensors?

http://www.ebay.com/itm/NEWEST-DC-1...r-Hall-Balanced-Car-Driver-Board/231954428640

or just go beefier?

http://www.ebay.com/itm/12V-24v-30A...high-current-motor-driver-board-/111954645718
Click to expand...

The first one requires hall sensor, so it won't work with jebao pump.

the second one is rated 18v max only.

I'm thinking another thing to try is to replace the mosfet. The specs of the mosfet used on the board looks fine, but maybe the quality may not be good.

I am also going to capture the 6 motor drive signals for the green board and compare it to the data I captured from the stock controller just to make sure the phase is similar.

I think it is just a matter of component value choice to get this working.

regarding the addition of the diode to help discharge FET capacitance. I just check the specs again, and the input capacitance of the NE6990 is 2 to 3 times higher than a couple other MOSFETs I checked. So perhaps either adding the diode or changing the mosfet may improve the power.
 
Last edited:
karimwassef said:
ok. based on the datasheet:

http://www.maxim4u.com/download.php...34EE77B83D2F7B9&file=0528\nce6990_8192231.pdf

I'm going to connect gate to source with 1K:

<a href="http://s1062.photobucket.com/user/karimwassef/media/0_zpsnebrj6xt.png.html" target="_blank"><img src="http://i1062.photobucket.com/albums/t496/karimwassef/0_zpsnebrj6xt.png" border="0" alt=" photo 0_zpsnebrj6xt.png"/></a>

right?
Click to expand...

Here's the missing image

<a href="http://s1062.photobucket.com/user/karimwassef/media/0_zpsrjd6cvue.png.html" target="_blank"><img src="http://i1062.photobucket.com/albums/t496/karimwassef/0_zpsrjd6cvue.png" border="0" alt=" photo 0_zpsrjd6cvue.png"/></a>
 
https://www.amazon.com/DIGITEN-Effe...TF8&qid=1467041469&sr=1-5&keywords=flow+meter

People claim that this G thread or BSP thread wouldn't work with NPT fittings. That was my only concern, but I got it over the weekend and it fits perfectly with a 1" female NPT fitting. Put some teflon tape on it and it will seal just fine.

Anyway, its just a simple hall effect senor that outputs a PWM singal. I need the signal conditioner to converter it to a 4-20mA signal to input into my PLC.
 
d0ughb0y said:
The first one requires hall sensor, so it won't work with jebao pump.

the second one is rated 18v max only.

I'm thinking another thing to try is to replace the mosfet. The specs of the mosfet used on the board looks fine, but maybe the quality may not be good.

I am also going to capture the 6 motor drive signals for the green board and compare it to the data I captured from the stock controller just to make sure the phase is similar.

I think it is just a matter of component value choice to get this working.

regarding the addition of the diode to help discharge FET capacitance. I just check the specs again, and the input capacitance of the NE6990 is 2 to 3 times higher than a couple other MOSFETs I checked. So perhaps either adding the diode or changing the mosfet may improve the power.
Click to expand...

I'm with you on this. I think it may just be that the components used are not the best quality. I have found this to be the case on lots of electronic parts coming in from china.
 
stage3-s4 said:
https://www.amazon.com/DIGITEN-Effe...TF8&qid=1467041469&sr=1-5&keywords=flow+meter

People claim that this G thread or BSP thread wouldn't work with NPT fittings. That was my only concern, but I got it over the weekend and it fits perfectly with a 1" female NPT fitting. Put some teflon tape on it and it will seal just fine.

Anyway, its just a simple hall effect senor that outputs a PWM singal. I need the signal conditioner to converter it to a 4-20mA signal to input into my PLC.
Click to expand...



I take it this does not have any metal part in contact with water right? This would be a nice addition to a controller.
 
d0ughb0y said:
I take it this does not have any metal part in contact with water right? This would be a nice addition to a controller.
Click to expand...

Its pretty much all plastic. I haven't taken apart the entire thing yet to verify. The shaft for the wheel inside could be stainless steal but its so small I'm not worried about it. You could easily add something like this to your controller. I think its great to have with a variable pump. You could start to program PID control loops and stuff if you really wanted to get crazy.

I went to Reefapaloza this weekend and of course neptune was there displaying the new flow meter that they are coming out with. Its almost identical to this one. I asked when I could buy one and no one could confirm a date or price yet. Why wait for theirs?
 
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