Well I can't understand what is going on in the circuit diagram.a bit sketchy but, you'll get an idea.
i just told you it's resistive load.Don't start a design until you have an acceptance criteria for noise out to a target load with a target cable and EMI line noise since it is> 100W.
The load can be any peripheral or step load or reactive motor and EMI noise. Otherwise you are not ready to design.
okay, don't like that rectifier, you can spill some milk in here post a correct part. did it even crossed your mind that that's why Im here? like when that thing is 100% why should I post here? to wait for your agreeable nothing? just ******* go some place other when you dont want to add nothing constructive. don't need that debility comments which leads to nothinganother example you are not ready to design is you have chose a bridge rectifier rated for 35 Vrms on the grid which can produce explosive transients from nearby lightning and you have no protection.
Start by reviewing similar existing designs and identify every function of most of the parts and how it is tested and rated with specs.
It would have helped to have shown that on the circuit diagram.J7 is connection for load; MOSFET is on the low side, so drain goes into the J7 with the + from the rectifier directly. load is resistive
So the live connections, which are the rectifier, MOSFET and load, as well as both sides of PS2, are all connected to the live and neutral so they should not have any connection to the chassis. Any connection to chassis would be dangerous or would trip an RCD on the supply.
yes, I think that's what I have, everything from this part connects to the 'power' part by opto-couplers..The low voltage side, so the output side of PS1, the processor, and the input to the opto-isolator, should have no connection to the live connections.
basically that is what I have, right? GND1 connected to Earth as you can see on the top of the schema.. GND and GND1 _never_ connects. this is what I wanted to validate here..if I can do any better..It's likely that the 0.25 mA leakage of PS1 will be most of the leakage. That amount of leakage is safe, but I agree that you can feel it. There is probably a mains-rated capacitor between the supply and output of PS1 to reduce noise.
If you have a supply with a ground connection as well as live and neutral, you can connect the -ve of the PSU output to ground. If not, and the leakage is unacceptable, you need a power supply with less leakage for PS1
sorry, thought that's pretty obvious as that MOSFET is there for powering the (resistive) load and it leads to J7.It would have helped to have shown that on the circuit diagram.
It certainly isn't clear from the circuit diagram.basically that is what I have, right? GND1 connected to Earth as you can see on the top of the schema.. GND and GND1 _never_ connects.
Perfectly normal (as you probably know), it's simply leakage through the suppression components from live to chassis, and neutral to chassis, if the earth wire is disconnected then the chassis will float at half mains voltage, at a very low current.Just to add, I had a bad earth connection on a washing machine, and I felt a definite tingle when I touched it lightly and touched the radiator at the same time. I couldn't feel anything if I wasn't touching both.
I measured around 120 V ac between the two. I can't remember if I checked the short circuit current, but it obviously wasn't enough to trip the RCD. There was no measurable voltage when the earth was connected properly.
I suspect that if you are feeling a slight shock when touching the circuit, either it isn't earthed properly, or something else is putting a voltage on your body. There is always some pick-up on people. A standard way of testing if an oscilloscope is working is to touch the input pin while not touching ground. If there isn't a pick up of some mains voltage, the oscilloscope isn't working. Of course that relies on the person being close to a load of mains-powered items, but that's almost always the case in any house or lab or office.
It got fixed very shortly after I realised what the problem was.However, REALLY bad news to have the earth disconnected from a washing machine, water and electricity don't play well together
nahh... when earth is connected it's all good. no phase on 'control' (PS1 powered) circuit part. I really just need someone more oriented in electronics to validate that or propose some more top-notch solution b/c intention with this is to go commercial. so 'power' part will be isolated out of touch and 'control' part earthened. i have it in front of me, it works, so far so good, just really need to get this done properly.I suspect that if you are feeling a slight shock when touching the circuit, either it isn't earthed properly, or something else is putting a voltage on your body.
in reality I'm using this GBP204. so far... which would be more suited?The proper bridge diode is one hgiher suffix letter for say 350V and then surge suppression. like a polyfuse and MOV or a fuse.
purpose in higher overview is for this 'power' circuit to drive a heatpad. that is generating a heat, sensed by temp meter hooked on RPI on which user sets desired target value and software regulates the power to get there. with PWM. so really, driving the resistive load (200W and I don't have any information on this heatpad from the reseller) with feedback loop through sensors and algo to set a duty cycle.More important is always start with the purpose of this project.
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?