Questions tagged [compensation]
The compensation tag has no usage guidance.
84
questions
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50 views
Switching power supplies [closed]
Please what is the function of a compensation circuit in the feedback loop of an SMPS such as the one below.
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2answers
54 views
Compensation of custom high voltage power supply
To test an offline switching PSU I decided to build a custom isolated high voltage variable PSU. The idea was to build a nice, small, low power equivalent of a variac and isolation transformer that is ...
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1answer
43 views
Microstrip blocking capacitor ground cutout — large cutout size
I'm attempting to minimize the \$S_{11}\$ of a \$10\,\text{pF}\$ DC blocking capacitor on a microstrip trace for my signal frequency range, which is \$5.3-5.9\,\text{GHz}\$. My microstrip trace width ...
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1answer
43 views
3 wire load cell and HX711 weight compensation
in my project I use 3 wire load cell (like this (3wire 50kg) but mine are purchased from ebay) and HX711 for weighing.
My wiring is like this (but i use Arduino mini pro 3V3):
Apparently it should ...
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0answers
31 views
SMPS Compensation, Multiple Poles for Multiple Output Capacitor Types?
Situation:
I have a flyback with a high voltage output. The following capacitors are on the output:
1x Large bulk 450V Electrolytic capacitor (22uF, 10 Ohms ESR)
2x parallel Ceramics (0.22uF 0.01 Ohm ...
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36 views
Using frequency-compensated resistive divider as digital level-shifter
We have all seen the "frequency-compensated resistive divider" circuit in, for example, 10X oscilloscope probes:
simulate this circuit – Schematic created using CircuitLab
Has anyone tried ...
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1answer
43 views
Sensor Error Adjustment
I have been asked to improve the high end accuracy of a pressure sensor (Without modifying hardware). I have collected data from 30 samples and found a trend to the error. My question now is if it is ...
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1answer
80 views
How to compensate an op-amp at a particular frequency?
I am trying to design an op-amp but because it is going to be used at a max frequency of 10kHz, I only need to make sure the phase margin is good enough at this frequency. Most of the methods for ...
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2answers
93 views
Frequency compensation and feedback capacitance
I was reading the chapter of Microelectronic Circuits (Sedra Smith) about negative feedback systems, and it shows an example of Miller frequency compensation with the capacitance Cf shown in the ...
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1answer
95 views
Two stage op-amp design with compensation ideas
I am trying to design an op-amp with a high-pass feedback. The diagram is shown below. The high pass feedback has a corner frequency at 1Hz.
The op-amp itself is two stage as can be seen below.
...
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0answers
34 views
How to determine these resistors in 2-pole 2-zero feedback loop compensation
I'm trying to build a 2-pole 2-zero feedback loop compensation for controlling a full bridge dc-dc converter. It's my first time doing this and I'm following the book power supply cookbook. Book is ...
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23 views
Slope compensation of MAX17498
I want to use MAX17498 in boost mode.
I have a problem setting the slope compensation. The slope (as I understand) is the gradient of the inductor's current ramp. The unit is [A/s] or [A/us]. However,...
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1answer
79 views
Stability of SMPS designed for a motherboard
Many books have covered the stability of many configurations of switch mode power supplies and they have given details on how to set the poles and the zeros of the compensator to make the the power ...
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1answer
250 views
Implementation of Adjustable Current Limiting Circuit
I have a circuit that can deliver 0-10V and 0-100mA to a load, and want to have an adjustable current limit that will limit the current delivered. To do this I have a current shunt that I monitor, and ...
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0answers
89 views
Type 3 Compensation on Full Bridge DC-DC Converter with SG3525
I'm trying to build a 48V-400V full bridge dc-dc converter. I'm using sg3525 as pwm IC and trying to get isolated feedback from output and planing to do it with TL431.
When I study on it people are ...
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1answer
56 views
Non Inverting Type 2 and 3 compensators
I'm looking for the topology and transfer function of a non-inverting type 2 and 3 compensators (PID controller). they are used in CC and CV feedback control in charging/Discharging circuits of ...
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1answer
85 views
Designing a lead compensation for a 3rd order system
Question Title:
Consider the control system shown in Fig.1. Design a compensator such that the
unit-step response curve will exhibit maximum overshoot of 25% or less and settling time of 5 sec or ...
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2answers
118 views
Controller vs compensator?
Both these terms: controller(forexample PID controller) and compensator(Lead compensator) are often encountered in control systems,but what is difference between these two?
Brain douglas in this ...
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1answer
47 views
Is it possible to create power factor compensation for a single power supply?
A 24V 150W power supply's power ratings is marked on its surface as follows:
In this case as you can read the cos phi is 0.45.
I know that the utility which provides power to the systems wants to ...
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0answers
97 views
Frequency compensation of a two-stages class AB amplifier
The author of the book on which I'm studying explains in depth the following "standard" two-stages op-amp:
In order to deal with frequency compensation, he models each stage with a transconductance ...
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0answers
29 views
Controller and compensator
What is the difference between controllers and compensators
While searching for answer the most prominent answer I got was that compensator have magnitude=1 and is used to make sure the system ...
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1answer
90 views
Poles and Zeros of a Transfer Function
I am trying to understand the physical meaning of poles and zeros of a transfer function. Can someone help me how to understand the Figure 2b in the link below?
What does the height of the cone ...
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1answer
182 views
Loop compensation of a Buck Converter
I have a buck converter. TPS54260
Vin = 7V-20V
Vout = 5V
Iload=600mA.
I realise that there is a similar question in this forum but I was not able to get clarity.
I want to understand what do you ...
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4answers
155 views
Negative feedback and op-amp poles
I'm trying to get a better understanding of frequency compensation for op-amps. I'll start off with a very specific questions and then get into the context. For a certain op-amp, open loop gain is ...
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1answer
109 views
Constant-gm bias circuit
I am doing a study on Improvements in biasing and compensation of CMOS opamp.
Do you guys know how to come up with the equation for RDS4C ?
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114 views
opamp constant-gm bias circuit
I try to incorporate the constant-gm bias circuit (Figure 6 in Improvements_in_biasing_and_compensation_of_CMOS_opamp) into the PFC (positive feedback frequency compensation) opamp, but it resulted in ...
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1answer
172 views
Analog implementation of imaginary roots in a transfer function
I have a simple boost converter, and from multiple papers I've read through, a Type 3 Compensator is recommended. I designed one in Matlab/Simulink, and it reacts very quickly. The problem is, when I ...
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2answers
175 views
Compensation capacitor(s) in instrumentation amplifier
I wonder whether the discrete 3-opamp instrumentation amplifier requires any compensation capacitors:
simulate this circuit – Schematic created using CircuitLab
Is it in general recommended to ...
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2answers
482 views
Crystal compensation for temp and voltage
Introduction
I'm toying with the design for a fail-safe wall clock controlled by multiple 32.768kHz crystal oscillators. I'm currently reading about compensation.
Compensator from literature
From ...
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2answers
148 views
Emitter-coupled logic operation
For the operation of emitter-coupled logic and sedra smith book,
1) Compared to CMOS, why ECL is the faster logic family given that it requires so many transistors to propagate to output Y (T5 ...
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1answer
52 views
Static VAr Compensation
I have to design a 3 phase Reactive Power Compensation System with using only reactors, no capacitor is needed. Total capacity is 505kVAr, but 475kVAr will be done with contactors, rest (30kVAr) will ...
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3answers
369 views
Why is frequency compensation required here?
Circuit requirements:
DC voltage gain: 50dB
Unity gain bandwidth: 50MHz
Phase margin: 45 deg(60 deg is recommended).
The circuit is completely symmetric, so M1=M2, M3=M4, and M5=M6. Therefore the ...
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83 views
4-20mA current loop - transmit sensor reading
I am working on design loop current transmitter- to transmit reading value from thermocouple sensor using below design. I measured co-junction temperature using NTC instead of RTD.
During applying ...
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1answer
134 views
Hybrid Boost-Flyback Stability Issue
I tried to design a step up SMPS to create ~200-300V from a 24V input with an expected power of ~12W max. Since the project is for a hobby, I chose to attempt a hybrid boost-flyback converter to get ...
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1answer
138 views
Adjustable non-inverting Buck-Boost converter failing right after starting in boost-mode
I am designing an adjustable non-inverting buck-boost converter based on LM5176 chip. Adjusting is done by DAC via feedback network, more on that technique can be found here.
The input voltage is 32V ...
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1answer
86 views
-20 db/decade Gain Slope requirement for Stability?
I have been learning Analog Filter designing. I started with Loop Compensation in power supply. I came across a document. It ...
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1answer
262 views
DCDC converter load step and phase margin
When applying load step to a DCDC converter we can approximate the phase margin from the presence/absence of oscillation and the crossover frequency as well from the response time.
The question is: ...
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1answer
70 views
Dynamic Compensator in Control Loop
Sorry if this has been asked previously, but I couldn't find anything here or elsewhere on Google (but maybe I'm searching the wrong terms).
I'm trying to design a Type 2 compensator for a PWM chip I'...
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1answer
382 views
AD4610 - Is it possible to eleminate this single overshoot
I am trying to compensate input capacitance of the AD4610. It does not matter if it is actually over- or undershooting - there is always a spike:
I do not have this problem with the OPA4141 for ...
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1answer
234 views
design of compensator type 2 for current mode control of boost converter?
I have designed boost converter with Peak current mode control in PLECS. I have used the method of k factor approach to design the compensator. the bode plot transfer function of the power stage is ...
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1answer
100 views
Compensation for op-amp difference circuit
I have a difference amplifier built with an op-amp (specifically, I'm using the LT6237) with 10dB gain:
simulate this circuit – Schematic created using CircuitLab
As it is, without external ...
2
votes
1answer
415 views
Average current mode control compensation
This is the structure of average current mode control (source here).
Please look at signal \$V_{com}\$ at the positive input of PWM modulator.
For proper operation, in steady state the magnitude of ...
0
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2answers
77 views
Why is this Type I compensator phase not 270 degrees?
This is a Type I compensator with a pole at origin. The transfer function between \$V_{in}\$ and \$V_{out}\$ is as follows:
$$ \frac{V_{out}}{V_{in}}= -\frac{R_{2}}{R_{1}+R_{2}} \frac{1}{s (R_{1}|| ...
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3answers
2k views
Need for Temperature Compensation of Current Mirror
I am currently learning about current mirror configurations. I have made two of them so far. Both of them worked as desired but, when heated or cooled, the current through the right side (the side ...
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0answers
169 views
Overcoming cogging/ripple torque in gimbal motor
So I'm trying to figure out how to spin a camera on a brushless gimbal motor. I am feeding each of the terminals a sinusoidal pwm signal from a via 3 half bridges on the SN754410. Each of the pwm ...
0
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1answer
195 views
Type of capacitor for feedback / external compensation
Referring to the capacitor between the output and the inverting pin in an op-amp, in parallel with the feedback resistor --- should I use ceramic (NP0), or thin film?
We're talking bandwidth in the ...
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2answers
917 views
OP-AMP DC offset compensation
I do not know how to compensate the DC-offset caused by the Input bias current.
simulate this circuit – Schematic created using CircuitLab
How to compensate the input current bias DC offset? ...
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3answers
3k views
How to compensate gain and offset errors
I have an analog circuit which has an offset error as well as an gain error.
I can measure the analog output of the circuit and I am able to manipulate the gain of the circuit by means of a factor <...
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1answer
495 views
Op-Amp's Dominant-Pole Compensation
I'm reading "Op Amps for everyone" (http://web.mit.edu/6.101/www/reference/op_amps_everyone.pdf) and I'm currently studying the chapter about the compensation of op.amps. but I'm missing a passage. At ...
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1answer
185 views
The Frequency Compensation of LT1683 in a DC-DC Converter
The fig. 10 of Jim Williams's article presents a 2A laser current source circuit using the LT1683. I am confused about the frequency compensation circuit of fig. 10 (pin 12 Vc of LT1683). The page 8 ...
