Questions tagged [compensation]

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133 views

Tilt compensation for yaw calculation from magnetometer and accelerometer

I am working on a project where i have to calculate the raw, pitch and yaw angle using an accelerometer and a magnetometer. I calculate the pitch and roll angle through the accelerometer and I am ...
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1answer
528 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 ...
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1answer
40 views

Trouble with meeting design specifications of a second order system using Matlab

I am trying to solve the following question. Consider the transfer function $$G(s) = \frac{1.247}{s^2+9.76s+23.8}$$ is in the forward path of a unity feedback control loop. Assume that it is ...
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0answers
58 views

Underlying reasoning behind lead and lag nomenclature of compensation

If \$0<z, \;p\$, the Laplace transform transfer function \$\frac{s+z}{s+p}\$ constitute two distinct types of compensators. If we look at this schematic, \$0<z<p\$ (lead compensation) implies ...
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0answers
35 views

Phase Lag Compensator

I have a question on lag compensators in general. Why do they increase both the rise time and the settling time? Is it due to the introduction of a slow pole? Much thanks!
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0answers
61 views

fast analytical technique identifying poles/zeros using degree of freedom

I encounter some engineers who can quickly spot poles and zeros in the circuit by identifying "degree of freedom". For example, a typical technical discussion goes like : "a miller ...
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0answers
11 views

i have two questions about value of adc being changed

I want to acquire the values movement of two strain gauges attached to dc motor For example, first strain gauge has values around 10000, the second has 20500 in 0 degree while the first is 10400, the ...
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1answer
546 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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1answer
355 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
204 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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2answers
778 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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0answers
216 views

Using a suitable Compensator problem - Control Theory

Problem: \$\,\,\,\$ A system is described by the open loop transfer function $$\frac{k(s+2)(s+7)}{(s+5)(s^2+2s+5)}$$ Design a suitable compensator in order to have \$w_n =\sqrt{10}\,rad/s\$ and \$\eta=...
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45 views

IGBT Temperature Drift: How to Achive Stability?

I remember the BJT transistor circuits are designed to compensate for the fact that the parameters of the transistor change with the temperature. I could not find similar ready-to-use solutions for ...
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47 views

How to find the compensating gain required for the 2nd order control system to have 5% overshoot

I have a unity feedback control system with $$G(s) = \frac{1.247}{s^2+9.76s+23.8}$$ in the forward path. Now Imagine, I added a static gain K in the forwards path to make the %overshoot 5%. How can I ...
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27 views

Why are complex valued zero and pole not used in lead or lag compensation design?

Consider the compensation transfer function \$\frac{s+z}{s+p}\$ so that the inequalities \$0<z<p\$ and \$0<p<z\$ correspond to lead and lag compensation respectively. It can be seen that ...
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0answers
34 views

LMH6629 Spice Model, where to put compensation pin?

I am trying to use a spice model from TI for the LMH6629 op amp and the model has a compensation pin. I pasted the code in a spice directive and tried to use a generic op amp model for it, but the ...
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29 views

Isolated Type 3 Compensator

I'm trying to build a full bridge dc-dc converter and planning to apply a type 3 compensator(voltage mode). When I check the isolated feedback type 3, I've read some comments indicate that it's hard ...
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0answers
70 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
88 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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0answers
46 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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24 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
381 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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146 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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108 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
309 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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218 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 ...
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496 views

Origin pole in type II compensator using OpAmp

I am reading about Type II Compensator Using Op-Amp from the application report here (page 4). From the transfer function (4), we can see that there is an origin pole, \$f_{p0}\$. However, the ...