Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [compensation]

For questions about designing electronics to account for undesirable characteristics or behaviors, such as frequency compensation in a feedback control system to avoid instability and/or improve gain and phase margin, reduce overshoot and ringing, improve bandwidth, etc. Consider using in conjunction with associated tags such as "feedback", "stability", "frequency-response", "nyquist-plot", "bode-plot", "operational-amplifier", etc., if appropriate.

For questions about designing electronics to account for undesirable characteristics or behaviors, such as frequency compensation in a feedback control system to avoid instability and/or improve gain and phase margin, reduce overshoot and ringing, improve bandwidth, etc. Consider using in conjunction with associated tags such as , , , , , , etc., if appropriate.

143 questions
10
votes
3 answers

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 where the output is taken from) decreased or…
Keno
  • 2,360
  • 2
  • 35
  • 65
8
votes
2 answers

Calculating values for compensation network (boost converter RC+C network)

I'm trying to build a boost converter with current mode PWM control, but I'm stuck at selecting capacitor and resistor values for compensation. I'm using a LT1619 as the controller IC: simulate this circuit – Schematic created using…
Daniel Tork
  • 1,418
  • 17
  • 38
8
votes
2 answers

Why do we compensate PWM controllers?

I have been studying switch mode power supplies for a while. I have understood the working principle of several common topologies But there is a detail in the control circuit structures which I still don't understand. We use the \$R_c\$ and \$C_c\$…
hkBattousai
  • 13,913
  • 31
  • 114
  • 190
7
votes
2 answers

Understanding in-loop compensation for capacitive-loaded OpAmp

I'm trying to understand the in-loop compensation for a simple amplifier loaded with a capacitive load, as seen in this article from Analog: http://www.analog.com/library/analogdialogue/archives/38-06/capacitive_loading.html?doc=CN0343.pdf I…
C.Slade
  • 133
  • 6
7
votes
1 answer

Interpreting bode plot of type 3 compensation network for buck regulator

I'm struggling to design the type 3 compensation network for a simple buck PWM controller. The controller is a Richtek RT8110B. According to the datasheet, half of the type 3 network is in-built and cannot be changed: Note Rs, Cs, and Cp are…
Dan Laks
  • 8,504
  • 4
  • 27
  • 43
7
votes
1 answer

Should I be concerned when loop gain rises back above 0dB on simulation?

Interim update Okay, I just realized I screwed up on the simulation. When I added \$C_{bp}\$ I upset the "break" in the feedback loop necessary to get the loop gain. The left-side lead has to go to the FB node leaving the INV node the only thing…
scanny
  • 7,062
  • 5
  • 47
  • 87
6
votes
1 answer

Loop compensation design of buck converter

I am trying to design loop compensation with type-3 error amplifier for a buck converter. I'm a student and very inexperienced in this subject. Please bear with me. Here is the general procedure that I've gathered from reading many many application…
JGalt
  • 867
  • 2
  • 21
  • 38
5
votes
3 answers

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 k_gain_comp and the offset by an additive value…
Maxwell1919
  • 179
  • 1
  • 2
  • 7
4
votes
1 answer

Role of input capacitance for cascode-input op-amp

In the below schematic of a cascode-input op-amp, the input transistors M1 and M2 present no capacitive load to the input signals, because their gate-source and gate-drain voltages are stabilized. The schematic omits frequency compensation…
tobalt
  • 18,646
  • 16
  • 73
4
votes
0 answers

Output voltage not stable - What is compensation with respect to DC-DC (buck converter)?

EDITS: Input voltage range: 24V to 48V. Changing the load current from 0.38A to 1.018A increases the mean output voltage from 12.779V to 13.26V. The supply should be producing 12.5V. I'm using this IC - Link The schematic has a saw tooth output…
user220456
4
votes
2 answers

Why does overshooting occur when probe's adjustable capacitor is under-value

I can't wrap my head around how overshooting (the spike) happens when the 10X probe capacitor trimmer (Cp) is under-tuned (i.e. adjustable capacitor's value is not high enough). There are countless of tutorials online but none I found explains how…
KMC
  • 1,380
  • 2
  • 18
  • 39
3
votes
2 answers

Buck Converter Compensation and Transient Response

I am trying to compensate a buck converter. I've set up an averaged model of a buck converter in LTSpice. Here is a picture of the simulation. The B3 voltage takes into account the gain from using a 5 Vpp sawtooth wave for the comparator: Note: L1…
Gman
  • 45
  • 4
3
votes
2 answers

How feedback loop is done in wide voltage range laboratory power supply? TL494 compensation

Hello i would like to ask how is compensation done on switching PSU with wide range variable output voltage (from zero to several hundres of volts). I have succesfuly (I guess) simulate my own design with simplis (picture #1). I am using TL494 which…
MacIntoshCZ
  • 111
  • 6
3
votes
1 answer

Flyback power supply instability issue

I have created a switching power supply: Input: 230 V AC Output: 12 V DC, 1 A Controller: UC3844 Topology: flyback Switching frequency: ~ 100 kHz Schematic: When I start this power supply, output voltage oscillates between 11 V and 14 V. Switching…
Chupacabras
  • 5,394
  • 2
  • 23
  • 50
3
votes
3 answers

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 following video tells that both these terms controller…
LECS
  • 1,173
  • 11
  • 30
1
2 3
…
9 10