How Does This Current Sensor Close its switch?

[ThomsCircuit]

What exactly is the "sensor switch"? Is it two wire holes?

What exactly is the "sensor switch

The white socket.

 

[Buk]

this setup is cost effective too.

For a petitioner that started with this question, your knowledge appears to have come on by leaps and bounds.

 

[ThomsCircuit]

your knowledge appears to have come on by leaps and bounds.

lol

 

[eTech]

just need to know how to complete the switch E-Tech. this setup is cost effective too.

The white socket.

If the switch is the white connector, then when closed, it shorts to ground. And seeing that its on a separate PCB makes me think it may be some distance away from the CT circuit. So...you would remove R2, and maybe C1, then connect Q1 Drain to a relay -coil then relay +coil to +12. Connect a deenergized relay contact to your switch sensor "connector". When the mosfet turns on, the relay should energize and close the contact.

Just a reminder...
1. This is an untested circuit.
2. As other members have stated, YOU will be working with DANGEROUS VOLTAGE LEVELS (levels that could even be Fatal if mishandled). Take every precaution for safety and stay on high alert!

 

[ThomsCircuit]

If the switch is the white connector, then when closed, it shorts to ground.

yes it does. Ive got a few signal switching relays left that are polarity sensitive so ive used them in this circuit.
here is the modified circuit. just give it your approval. And i will be careful.
Note the 2n7002 ive located is an SMD type 7.5 Ohm 115ma 60v. The Relay is a NA-12 W-K PDF Datasheet

 

[ronsimpson]

The Relay is a NA-12 W-K PDF Datasheet

Look at the schematic you posted and there is a diode across the relay coil. That is a good idea.
Do you now not want the "delays" in the original circuit?

 

[ThomsCircuit]

Look at the schematic you posted and there is a diode across the relay coil. That is a good idea

If your referring to my workshop project yes. Good idea.

Do you now not want the "delays" in the original circuit

No I want to keep the workshop circuit like it is. Have I done something to alter that? The delays are crucial.

 

[ThomsCircuit]

Workshop circuit

 

[ThomsCircuit]

CT circuit

 

[ThomsCircuit]

How does the CT circuit effect the workshop circuit??

 

[eTech]

How does the CT circuit effect the workshop circuit??

Your schematic #109 has a few errors:
1. You have the +5v connection wrong. +V (+5) should only connect to the + side of the relay coil.
2. +5V for the relay (you can use 12v if you want to use a 12v relay) will need to come from your DC power supply.
3. There should be a 1N4004 (minimum) across the relay coil. Cathode to +coil, Anode to -coil.
4. The DC ground connection needs to be the same DC power supply ground used for the workshop circuit.

I think the above errors is what RonS was referring to...

Anyway, with the noted corrections it shouldn't affect the workshop circuit at all except to open/shunt the sensor switch connector pins via the relay.

 

[ThomsCircuit]

I think the above errors is what RonS was referring to.

I actually had it like that at first but thought it was wrong. Ill correct it and upload. Thank you so much.

 

[ThomsCircuit]

OK. I believe i have this correct now.
Added (4148) across the coil of the relay
Used ground from Workshop circuit. It comes in from SW1 pin 1
Re-routed 12v to connect to just the positive side of relay coil (NA-12WK)
12v supply from SW2 pin1 of workshop circuit

--------------------------------------------
All components will be on a custom made board to fit this box.
The CT will protrude from the box on the other side of the circuit board
low voltage connections will be supplied to box via 3 pin plug from workshop circuit
Distance from each box is apx 5 inches. they are completely isolated from one another

 

[eTech]

Here is schematic

Simulation Results:

.step rl=12
.step rl=13
.step rl=14
.step rl=15
.step rl=16


Measurement: irms
step RMS(i(rlac))
1 9.9596 0 2
2 9.19328 0 2
3 8.55165 0 2
4 7.97648 0 2
5 7.47549 0 2

Measurement: led
step i(led)
1 0.0212006
2 0.0212007
3 0.0212014
4 1.06739e-008 <---LED off
5 1.06741e-008 <---LED off

The simulation shows the LED turns off when the AC line current falls below ~8.5 Amps.
But this is only a simulation. You'll need to test,tune, repeat, until the desired results are obtained.

 

[eTech]

OK. I believe i have this correct now.
Added (4148) across the coil of the relay
Used ground from Workshop circuit. It comes in from SW1 pin 1
Re-routed 12v to connect to just the positive side of relay coil (NA-12WK)
12v supply from SW2 pin1 of workshop circuit
View attachment 132686
--------------------------------------------
All components will be on a custom made board to fit this box.
The CT will protrude from the box on the other side of the circuit board
low voltage connections will be supplied to box via 3 pin plug from workshop circuit
Distance from each box is apx 5 inches. they are completely isolated from one another
View attachment 132682

Will there be any AC line voltages inside the box?

 

[ThomsCircuit]

ill there be any AC line voltages inside the box?

Absolutely NOT. I'll post the 3D render

 

[eTech]

Absolutely NOT. I'll post the 3D render

Excellent....just checking...

 

[ThomsCircuit]

The simulation shows the LED turns off when the AC line current falls below ~8.5 Amps.
But this is only a simulation. You'll need to test,tune, repeat, until the desired results are obtained.

Can you tell me if I connected the 250k Pot correctly? Best to see in the PCB. Copper pours will take care of the dangling grounds
Ive attached the SCH and top n bottom 3D renders. You can see the CT is opposite of the components. The PCB will be contained in a box and only the CT, LED, and 3 pin plug will be exposed.
C2 is a bi-polar cap 22uF 16V Radial Tantalum Capacitor

 

[eTech]

Can you tell me if I connected the 250k Pot correctly? Best to see in the PCB. Copper pours will take care of the dangling grounds
Ive attached the SCH and top n bottom 3D renders. You can see the CT is opposite of the components. The PCB will be contained in a box and only the CT, LED, and 3 pin plug will be exposed.
C2 is a bi-polar cap 22uF 16V Radial Tantalum Capacitor


View attachment 132697

If U1-pin 2 is the wiper then it looks correct.

On C2, you might want to put a + symbol next to the positive pin so it doesnt get installed backwards (and cause a firecracker sound when powered on ).

BTW - If your using Designspark PCB...you can design your own 3D printed box with Designspark Mechanical and pass the 3D PCB from DSPCB to DSM. I did this for my last project. Had the box 3D printed and the box came out nice. I didn't have to cut or drill any holes, etc. Took a couple of weeks to learn the software though and a couple of scapped printed boxes to get it right...but it was worth it. Now its easy....

 

[ThomsCircuit]

If U1-pin 2 is the wiper then it looks correct.

OK In other projects i connect the wiper (2) to 1 or 3 This setup is different.

On C2, you might want to put a + symbol next to the positive pin so it doesnt get installed backwards (and cause a firecracker sound when powered on ).

i thought these caps did not have a polarity? Im using ( bi-polar cap 22uF 16V Radial Tantalum Capacitor ) I will add the values though.

If your using Designspark PCB...you can design your own 3D printed box with Designspark Mechanical and pass the 3D PCB from DSPCB to DSM. I did this for my last project. Had the box 3D printed and the box came out nice. I didn't have to cut or drill any holes, etc. Took a couple of weeks to learn the software though and a couple of scapped printed boxes to get it right...but it was worth it. Now its easy....

So I can make my own enclosures? Now thats cool!