Questions tagged [hysteresis]

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Current Error Space Vector PWM

I am trying to implement the current error space vector PWM for three-phase IM. I have read some of the papers discussing the basics of this scheme.This has helped me to go with a approach but ...
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82 views

Why do lightbulbs have hysteresis when switching on? [closed]

When I gradually turn up the dimmer on my light it stays cold up to a certain threshold, suddenly lights up to medium, and then can be adjusted to a lower brightness. Tungsten filaments have a ...
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1answer
45 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 ...
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51 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 ...
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2answers
83 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. ...
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1answer
117 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 ...
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1answer
151 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 ...
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1answer
53 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 ...
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1answer
137 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 ...
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1answer
176 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 ...
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1answer
62 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 ...
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37 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 ...
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41 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 ...
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1answer
211 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 ...
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2answers
143 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 ...
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1answer
46 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 ...
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2answers
187 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....
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1answer
85 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?
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5answers
921 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?
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53 views

Comparator output problem

I have this comparator circuit using an op-amp. This is my actual op-amp used in the circuit. I have used TL072 as I didn't have the simulation model. This circuit is used to trigger the output when ...
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2answers
66 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 ...
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1answer
28 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 ...
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1answer
241 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....
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2answers
50 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 ...
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2answers
169 views

RS485 Input Hysteresis

What is the meaning of Input Hysteresis in the context of a RS485 transceiver? Thanks
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1answer
151 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 ...
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1answer
42 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 ...
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40 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 ...
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171 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 ...
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2answers
393 views

Schmitt Trigger design

Vcc=5V, Vin= a noisy input voltag I'm designing a non-inverting schmitt trigger using voltage divider. As shown from the image, I designed it on LTSpice and I got the desired results but from the ...
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0answers
176 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 ...
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2answers
89 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 ...
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1answer
59 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. ...
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1answer
36 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 ...
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2answers
51 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 \$...
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1answer
47 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?
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1answer
69 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 ...
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3answers
928 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 ...
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3answers
414 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 ...
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0answers
120 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 ...
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71 views

Solar power pump - Design critique and help

Okay so, I have a design that 'works' on the breadboard. But I feel like it could use some improvement. Here is my current design: simulate this circuit – Schematic created using CircuitLab ...
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2answers
137 views

Hysterisis - How do you choose a good value for R3?

simulate this circuit – Schematic created using CircuitLab Above is the basic schematic for a comparator with hysteresis. Determining the values of R1 and R2 is fairly straight forward. They ...
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2answers
2k views

What is the common name for this seal-in relay?

I'm trying to build a hysteresis water pump system with 2 water level switches. Please see the diagram and explanation of this setup I've taken off the web: The first switch (L) is set at the minimum ...
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1answer
358 views

Questions regarding eliminating hysteresis in ac dimmer

In the following circuit it says: “This hysteresis effect can be eliminated however, using the circuit from a detailed application note from Littelfuse shown in Fig. 6.4.4. Here the capacitor C1 is ...
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2answers
2k views

Calculating resistor values for a Schmitt Trigger and LDR circuit

I am trying to make a light sensing circuit which has hysteresis. I want an op-amp (LM358) to output logic 1 (12v) when the light level rises above 250 lux, and output logic 0 (0v) when the light ...
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1answer
158 views

Magnetic material demagnetization through Curie temperature

It is known that some materials lose their permanent magnetic properties when they are heated above certain temperature known as Curie temperature or Curie point. As those materials are cooled down to ...
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5answers
613 views

Schmitt Trigger hysteresis

I am studying comparators and Schmitt triggers. And I did not find anywhere how to choose the value of hysteresis. I understand its purpose and I know how to calculate it. But what value is needed for ...
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4answers
274 views

How can I modify this circuit for some hysteresis and better design?

I need to make a circuit even when the push button pushed and released very fast, the final output will stay ON at 12V for roughly a second. %10 accuracy for the timing is fine. An LED will indicate ...
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1answer
72 views

-Ve feedback comparator and its threshold values?

I was trying to analyse and understand the following circuit. My intention was to calculate the hysteresis of the comparator. Circuit working: For both compartor input, there will be voltage inputs ...
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28 views

Picking Supervisors for a battery with correct Hysteresis

I am trying to find a Supervisors ic that will detect low voltage(5V) on 6v lead acid battery so I can disconnect the battery from the circuit using MOSFET or load driver. how do you calculate ...