Questions tagged [hysteresis]
The hysteresis tag has no usage guidance.
120 questions
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How to increase the Drop-out voltage for plungers used in Solenoid valves?
I am working on solenoid valves where the plunger is a soft iron material. The solenoid coil I am using is 24V DC 18Watt coil specifically designed for this valve. I am trying to increase the drop out ...
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4
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How to calculate hysteresis of a comparator
I know this can probably be solved with some KVL but I think the theory is what is preventing me from figuring this out. I added a picture of my comparator setup below and I am trying to figure out ...
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Question when obtaining magnetic flux density B
I am trying to obtain the magnetic flux density B of a toroidal transformer with one winding around the core. I am injecting a voltage in the terminals of the winding, and I am measuring this voltage ...
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What's the deal with this comparator's hysteresis?
I have here a circuit designed by someone else to create a 50% duty cycle square wave that leads a current transformer in phase. The CT maxes out at about 1 amp, and the output of the phase-leading ...
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I need help to identify the negative feedback loop in a hysteresis comparator
Can anyone help me identify where the negative feedback path is?
I want to determine the feedback factors for both negative and positive feedback, but it's not clear to me where the negative feedback ...
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In the following circuit, do T1 and T2 conduct or block when the circuit is in the LOW or HIGH state?
This circuit is a Schmitt trigger, and the supply voltage Ucc.
is 15V. I want to calculate whether the transistors T1 and T2 are conducting or not when the state is LOW or HIGH(U(A)). These ...
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Hysteresis on inverting terminal for comparator circuits?
If you examine 98% of circuits online that include hysteresis for a comparator, they always implement the hysteresis on the non-inverting input, like so:
This is easy enough to calculate. However, ...
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Problem acquiring B-H curve
I'm trying to acquire the BH curve of a toroidal current transformer in saturation, having the primary and secondary current.
The formulas I am using are:
B = (1/NsS) Integral(Vs(t)dt)
H = (Ip*Np)/l
$...
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511
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Comparator with hysteresis equation for Vmax Vmin
In a scientific paper (Design Considerations for Current Transformer
Based Energy Harvesting for Electronics
Attached to Electric Motor J. Ahola et. al.) I came across the comparator circuit with ...
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What types of inductor cores exhibit magnetization?
My understanding of magnetization in core memories is as follows: a bit is written to an inductor's core by magnetizing it, by applying a large current. Later, the bit is read by observing the effect ...
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Adding hysteresis to over-voltage protection using comparator
I am trying to add hysteresis into my over-voltage detection circuit. The output of the comparator should be high as long as the supply voltage is below 14 V.
The circuit works perfectly fine, but I ...
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Comparator with hysteresis; what resistors go where?
Consider the following almost-surely-wrong comparator circuit:
simulate this circuit – Schematic created using CircuitLab
In various places I've seen similar circuits, some have R3, some have ...
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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 ...
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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 ...
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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 +...
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496
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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. ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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) ...
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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_{...
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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 ...
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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 ...
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456
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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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348
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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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529
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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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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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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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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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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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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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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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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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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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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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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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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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2
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992
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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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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?
user220456
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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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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 ...
user220456
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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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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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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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867
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RS485 Input Hysteresis
What is the meaning of Input Hysteresis in the context of a RS485 transceiver?
Thanks
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558
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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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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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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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