Questions tagged [hysteresis]
The hysteresis tag has no usage guidance.
108
questions
1
vote
1
answer
40
views
Need help driving the enable pin on a TPS2595 with a voltage divider; not exactly sure which method is better to use
I'm a hobbyist at best, and am trying to overcome the learning curve as far as pull-up and pull-down resistors, N channel transistors and P channel transistors, etc, etc.
I've got a USB Type-C charge ...
- 35
-1
votes
1
answer
46
views
Transformer's Hysteresis Loss
Relation between hysteresis loss and the magnetic field intensity is given but I don't know how the loss is affected by the frequency of the current. What is the relation between the frequency and ...
0
votes
0
answers
23
views
Hysteresis measurement voltage behaviour
I am currently doing a hysteresis measurement using the below depicted measurement setup, however with different values.
The odd thing is that I have different VM2 values, depending on how I connect +...
2
votes
1
answer
91
views
Designing a simple controller for a hot plate
I have a hotplate with a TS port meant for an external temperature control unit. The manufacturer's customer service told me that this port is not connected to anything internally in the model I own. ...
- 31
0
votes
1
answer
47
views
adjusting amount of hysteresis band
How is the amount of hysteresis band in the on/off controller adjusted?
I know that there should be a relation with time constant but I can't find the exact proportion.
Read so many papers but didn't ...
2
votes
3
answers
161
views
Is hysteresis needed for this non-inverting comparator?
I’m trying to figure out if the following comparator circuit (TL331) would be reliable in the following application, or whether I would need to add anything, like hysteresis.
To explain the ...
- 35
3
votes
1
answer
72
views
Single-cell lithium battery powered comparator circuit with hysteresis
I recently was reviewing a circuit I made and began to question its feasibility. The circuit cuts off a battery's connection to a load after the voltage has fallen below a certain threshold.
To ...
- 1,125
2
votes
1
answer
117
views
Calculating hysteresis with an open drain comparator
I have a circuit as follows which will compare an input voltage to a 2.5 V (actually 2.3 V) reference. In one of the documents, it mentions that the feedback resistor must be 100 × Rpullup. If my ...
- 189
3
votes
1
answer
58
views
Input voltage shift of a comparator
I am working on an envelope detector circuit. The circuit diagram is as shown here:
The output of the envelope detector (RC) is connected to the inverting input of the comparator with hysteresis which ...
1
vote
1
answer
137
views
Implementing UVLO on battery charging and boost controller ICs
I recently bought a Adafruit PowerBoost 1000 Charger and found out it does not have 32.V UVLO to protect the battery.
The boost controller IC has low voltage sense (LBO goes low when undervoltage) ...
- 427
0
votes
1
answer
95
views
How to understand the next values of a comparator inverting with hysteresis (Schmitt Trigger)?
I have my test graded and I'm curious about a question, since I think it's badly graded and I may need to request a revision.
I have been told there is a comparator inverter with hysteresis so \$|V_{...
- 485
2
votes
2
answers
201
views
Trying to implement a comparator with hysteresis
So here's the circuit:
I need to design the comparator with hysteresis.
So i saw this video:
I was thinking of doing the same on my circuit.
Vin will be connected to R1 and RNTC where it will form a ...
- 763
0
votes
1
answer
54
views
Improve conceptual intervalometer for rotating potted plants
I'm trying to avoid having my plants tilting or otherwise looking bad after only getting sunlight from one direction. To solve it, I want to make the pots rotate.
I'm trying to design a cheap, stand ...
- 321
1
vote
3
answers
223
views
Inverting Schmitt trigger design with subtle changes to the hysteresis loop and tripping voltages
Currently, I'm trying to analyze a Schmitt trigger circuit using the 741 IC op-amp, and how it overcomes the problems faced by an open loop comparator circuit.
This is a typical positive feedback ...
- 41
0
votes
0
answers
172
views
Power MUX Circuit with 5V & 3.3V Regulation + Reverse Polarity Using LM358 - Questions & Concerns
I'm working on a circuit that can be powered via USB or via header pins.
The goals are:
The MUX will determine, and prioritize, the higher voltage supply.
The MUX will provide reverse polarity and ...
- 69
1
vote
2
answers
275
views
How to scale (0-7V, 15-18V) to (0V, 3.3V) for OTGW project
Introduction
There is an open source project for implementation of Opentherm protocol which defines the master and slave circuit for digital communication according to the protocol specification. ...
- 335
1
vote
1
answer
181
views
Does the thermostat cause arcing?
I am planning use to resettable thermostat switch in my circuit. I will use it to turn off the optocoupler input. With 5 volt, current is 5-10 mA in optocoupler LED. But I'm worried that an electric ...
- 55
3
votes
1
answer
181
views
Why does this hysteresis curve approach saturation so immediately?
I am trying to find out the hysteresis curve of a transformer iron core. I use an LM741 for the op-amp integrator.
As I increase my 50Hz input voltage, I observe that Vin (value on the x-axis) does ...
- 151
0
votes
1
answer
71
views
Hysteresis curve's Y axis seems to be primarily measuring the DC dual power supply of the opamp integrator
I am trying to find the hysteresis curve of a transformer's iron core.
The curve looks good, but I do have a doubt:
The LM741 op-amp integrates the output voltage signal from the transformer's ...
- 151
8
votes
1
answer
165
views
Why is the saturation in the opposite direction different from the saturation?
I am trying to obtain the hysteresis curve of a iron core transformer.
To integrate the voltage output from the secondary coil, I used an LM741 opamp, 10k ohm resistor, 0.1uF capacitor, and 1M ...
- 151
3
votes
1
answer
297
views
Hysteresis curve does not look like what is expected on the oscilloscope
update: Based one the comment from @Andy aka, I tried to obtain the curve without using the integrator. It does give me a better looking graph.
Afterward, I switched the power supply to another larger ...
- 151
0
votes
1
answer
94
views
How to set up an oscilloscope with a 10000 turns 0.05A transformer and an AC power supply, in order to generate a hysteresis curve of the transformer?
I am a high school student investigating how varying the current output affects the shape of the hysteresis curve of a transformer.
To measure the hysteresis curve of the transformer's core, I tried ...
- 151
0
votes
0
answers
40
views
What do fixed values for the coercivity and remanence of magnetic materials really mean?
I've recently found a table in a book that lists values for the coercivity and remanence of some magnetic materials, one value per material. As far as my understanding goes, the shape of a material's ...
- 11
3
votes
2
answers
86
views
Why is B-H curve preferred to B-B_vac curve?
Can someone please tell me why we use H in the \$B-H\$ curve?
I initially thought
\$H\$ was the field strength of the field developed in a vacuum when a current is passed through a coil (placed in ...
- 481
4
votes
1
answer
280
views
Is magnetic hysteresis present even with a DC bias?
Consider the following circuit:
With Vin(t) = A sin(ωt) for some given frequency ω.
The relationship between Vin and Vout is certainly non-linear, because of the effect of hysteresis in L's magnetic ...
- 1,989
4
votes
2
answers
269
views
I am facing a problem while designing a Schmitt trigger circuit
I am applying a Schmitt-trigger to the waveform given in the figure below.
.
This is a 3.5 volt signal and I want to perform thresholding so I use 1.58 volts as upper threshold and 1.17 volts as lower ...
1
vote
1
answer
70
views
Weird hysteresis behavior
I am an EE student and recently we worked with Schmitt triggers, positive feedback loops, and hysteresis. I was curious and hooked up an mcp601 without a feedback loop as such:
In the above schematic ...
2
votes
2
answers
522
views
Hysteresis on LTspice with thermistor
I'm trying to simulate an hysteresis on LTspice. The goal is just to see how evolve the output voltage in function of the value of the thermistor. For this, I have done a simulation with several steps....
- 2,268
0
votes
1
answer
174
views
Op-Amp dynamic hysteresis
What is dynamic hysteresis in Op-Amp?
I read section 4.3 of the this App Note and was not clear.
Can someone explain me why this is happening?
- 3,925
0
votes
5
answers
1k
views
Can we declare Schmitt triggers to have memory? Can we call their output levels states? [closed]
Are Schmitt triggers able to be declared as having memory? Can we call their output
levels states?
- 33
0
votes
2
answers
70
views
How is the effective parallel resistance of this resistor network determined?
I have this circuit:
The effective resistance at the reference node of D4801 is given as
Rb = R4802||(R4805+(R4807||(R4806+R4808+44KOhm))) = 9.129KOhm
I am not able to understand how this formula is ...
- 3,925
0
votes
1
answer
30
views
MAX882 battery protection
I am thinking of using the MAX882 IC to protect my battery from overdischarging. What I could not understand from the datasheet I provided is that, if I use the STBY pin to set a threshold for my ...
- 381
2
votes
1
answer
653
views
Comparator hysteresis input signal filter
I need to heavily low pass filter an input to a hysteresis comparator, but due to the fact that R1 is one of the components setting the hysteresis, I can't add additional RC-circuits in series with it....
0
votes
2
answers
88
views
How to define the hysteresis of the buck-boost operation mode?
In the buck-boost (transition) operation mode of a four switch cascaded buck boost converter, there is supposed to be a hysteresis to prevent bouncing. How do we define the hysteresis in this case as ...
0
votes
2
answers
486
views
RS485 Input Hysteresis
What is the meaning of Input Hysteresis in the context of a RS485 transceiver?
Thanks
- 69
0
votes
1
answer
362
views
Comparator have hysteresis with pull-up resistor?
I didn't add any hysteresis to below circuit but there's ~500 mV delay between output going high and low, output goes high at 7.5 V but goes low at 7 V:
simulate this circuit – Schematic ...
- 2,096
1
vote
1
answer
65
views
resistor selection for TPS3700DDCR undervoltage circuit
I am designing an undervoltage circuit for a lipo battery project. I found this tutorial here which lead me to the TPS3700. I am wanting the undervoltage condition to be 3 volts. The part that I am ...
- 111
2
votes
0
answers
48
views
Does a pinch imply the presence of memcomponents?
There is a famous article by Chua "If it's pinched it's a memristor", where he defines a memristor as having a "[...] pinched hysteresis loop in the voltage–current plane when driven by ...
user255574
1
vote
0
answers
241
views
Magnetic hysteresis BH curve to compare "Fe-Ni" "Fe-Si"
I am compiling some training material and would like to include a graph to indicate the different characteristics of silicon steel "Fe-Si" and mumetal "Fe-Ni". The best curve I could find in SI units ...
- 746
0
votes
2
answers
754
views
Schmitt trigger design
Vcc=5 V, Vin= a noisy input voltage.
I'm designing a non-inverting Schmitt trigger using a voltage divider. As shown from the image, I designed it using LTpice and I got the desired results.
From the ...
- 1
2
votes
0
answers
310
views
What's wrong with my comparator
I'm trying to set up a comparator that goes high when the input is above 0V and goes low when the input is below -5V. I've used the datasheet equations to calculate the resistors for a non-inverting ...
- 75
0
votes
2
answers
145
views
Noisy output from opamp comparator
I built the following circuit to filter noisy pulses from a inductive tachometer pickup. The first opamp (U4D) acts as a peak detector. The second opamp (U4C) is a comparator which uses the output ...
- 937
0
votes
1
answer
144
views
Comparator with Internal Hysteresis
I need clarification regarding comparators with internal Hysteresis.
I have a comparator with internal Hysteresis “X” mv and I am using external feedback resistors to create a hysteresis of “Y” mv.
...
- 826
0
votes
1
answer
41
views
What is the cause of the error/unexpected outcome in water temperature control heating system circuit?
Here is the circuit with components I built as shown over here. The title of the circuit is water temperature controlled system. The function of this system is to control the heating while sensing the ...
- 1
0
votes
2
answers
69
views
Calculating core length and question regarding B-H curve
I understand the problem and all (or so I thought), but my answer was way off. Looking at the solution, I realized that I calculated the core length wrong.
I don't understand how though. Shouldn't \$...
- 257
0
votes
1
answer
83
views
Interpretation of the graph of excitation current for magnetic circuit
(From Electric Machinery, Fitzgerald)
Why does the current waveform here have such a sharp peak like that?
- 257
1
vote
1
answer
113
views
Op Amp Output Voltage with Hysteresis
so I have to design a circuit which lights up 2 LEDs depending on the output voltage of the Non-Inverting Amplifier. I haven't connected the LEDs in the circuit below because it's not part of the ...
- 13
2
votes
3
answers
1k
views
Output of LM393 won't swing LOW unless it is pulled up with a LED
I built the following circuit using an LM393 as part of a noise gate for audio applications. It's a voltage comparator with hysteresis.
I originally connected a 10 kΩ pull-up resistor and then ...
- 165
0
votes
3
answers
704
views
Schmitt triggers hysteresis symbols
So we're studying Schmitt triggers at university and we got these representations. Searched them on google for more info and got other representations. Now I'm confused. Can anyone help me with some ...
2
votes
0
answers
269
views
What is a suitable hysteresis value and averaging period for a residential thermostat?
I've built a microcontroller based thermostat that I am using to control my home HVAC system. The actual programming and physical assembly has been straightforward. I'm using DS18B20 sensors, so I ...
- 1,249