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61 Threads found on Type 2 Compensation
Hello I was trying to build temperature sensor with T type thermocoupler (it has two pins only) using pic18f45k22. I am using mikroC pro compiler. Can anyone help. Please
I've seen examples of two different ways to approach a similar design problem Say I'm desiging a SMPS and my requirement is for about 5khz of bandwidth. Example 1 places the output LC poles close to 5khz and uses zeros in the control compensation to "step over" the LC crossover/resonance point (standard type III compensation strategy) (...)
Hi all, I want to interface K-type thermocouple with microcontroller. I am confused where to start with as thermcouple output voltage is in some micro volt. So i think i have to connect an amplifier with the thermocouple rather directly connecting it with questions are: 1. How to choose an ADC for it (I want interface the ADC with SPI). 2
hi, What type of feedback amplifier (type-2,type-3 or PI) is used in a pure sine wave inverter? Suppose an inverter consists of a h-bridge and a low frequency iron core toroidal transformer. H-bridge is derived by sinusoidally modulated PWM (20KHz). At the secondary of the transformer there is a filter to get filtered 220v sine wave. (...)
Have to agree with Barry here. There are many limitations to accuracy that include the accuracy of cold junction correction, plus the purity of the metal alloys in the thermocouple, plus the accuracy and calibration of the electronic amplifier. Thermocouples have a great many advantages, but absolute accuracy is not one of them. Your best bet m
I have designed a phase modulator(analog) at 4GHz using hyper abrupt varactor diodes. Technique used is reflective type,using quadrature hybrids. I have chosen hyper abrupt diodes(GaAs,gamma>1) to get higher sensitivity(radians/V).Though, I achieved ) 0.7 rad/Vpp sensitivity but at the expense of higher distortion,more than 5% and higher AM%.
Dear friends , I need to make a j type temperature controller . Please suggest me how to proceed , never used one before . 1. I need circuit used for j type thermocouple signal amplification using opamp op07 and diode for cold junction compensation , I have seen temperature controllers using thermocouples in mkt and they use a diode (...)
Hi, The questions are for learning purposes, mainly. I have been reading about both points, and read some related threads here, but haven't found answers yet. I'm having difficulty understanding something and it's beginning to annoy me. Regarding linear (LDO or Standard) regulators and the error amplifier: As the error amplifier - which
Hi folks , please help me understand what kind of transformer i got and how many primary turns it needs, I was driving the transformer but after a while it gets hot and it should let more power through. I will post what I have, the schematic of the smps im using the transformer in and the photos of the transformer itself , mayeb you can help me ou
Which one first amplifying or filtering? What type filtering is suitable? You had not informed the application intended, but depending on the distance of the source of the sound to be recorded, to the microphone cell, you certainly will face to the need of some kind of frequency compensation performed either in h
Hi guys, I have one question: I have read around some technical white papers and in some books that the type II is suitable for a phase boost of 90? and for converter operating in current-mode and CCM. However, there is two white papers from two manufacturers that says that this compensator can be used to compensate converters that have a large
Do you agree with the following ?rules? (A to D) on the checking of type 2 compensator pole and zero positions? This is with regard to a CCM, Current mode flyback with a type 2 feedback compensation network..That is, making sure it is not going to be unstable.. ?The type 2 compensator zero MUST BE at (or very near) (...)
Hello, On pages 212 to 217 of ?Power supply cookbook? by Brown, it goes through a type 2 error amplifier feedback compensation scheme for a CCM flyback in current mode. It discusses the placement of the error amplifier's poles and zero, but does not do this with respect to the power stage RHPZ. Why is no mention made of the RHPZ? Surely an error
One nice thing about the transconductance type is that the FB pin is actually a high impedance, which can simplify the design of compensation and feedback networks. Also since the COMP output is high impedance, you can override it with external circuitry easily. Major con is that the transconductance may have a large tolerance to it.
Current mode control is probably best. Constant off time control is also good sometimes. Sometimes Boundary conduction mode is done as in BCM PFC's. Constant frequency current mode needs slope compensation if duty >50%. Voltage mode is possible and needs type 3.....but very few voltage mode controllers exist on the market. if its just low power
I am using K-type Thermocouple with Ungrounded junction. all the required circuits such as, cold junction compensation, filtration and amplification is working perfectly. My problem is at room temperature Sensor is showing same temperature of 0.5 degree greater than Thermometer. ( Room Temp aroung 26 to 28 *C). But at lower temperature this differe
hi i need help for To interface J type thermocouple to PIC16F877 and also want to display it to the lcd16X2 display. i want to use inbuilt ADC for the analog to digital conversion of given thermocouple.
Hi, what are poles and zeroes in a compensation network like type-3 compensation for 2 stage cmfb amp. how we can boost phase margin without affecting Bandwidth. by using miller compensation cap, BW decreases. thanks Safiya
Dear friends , I need to make a j type temperature controller . PLease suggest me how to proceed , never used one before . 1. I need circuit used for j type thermocouple signal amplification using opamp op07 and diode for cold junction compensation , I have seen temperature controllers using thermocouples in mkt and they use a diode (...)
When You designing two stage ota, the first of all You need to add a compensation network (e.g. Miller cap with nulling resistor or used a cascode compensation). Your amplifier is unbalanced - output transistor should be matched with first stage current mirror load. In addition the phase margin and GBW depends to feedback type, reference (...)
Dr Ridley, in his book, "power supply design", volume 1 , control, states on page 73 that regarding using a type 2 compensator for a buckboost, "the first pole of the compensator is placed at the origin to form an integrator" However, in the attached type 2 compensator, the first pole is f = 1......and this cannot be placed a
the above , why can I not place a resistor in series with C1 on the schematic on page 31? ((On page 36, they have placed a resistor (R2) in series with the C1 there, so why can't it be done with the circuit on page 31?)
it depends on the load type, but usually some type of isolation is necessary to prevent electrical shocks. the simplest yet high performance feedback isolation is opto-coupler which consists of a voltage reference (e.g. TL431) and an error amplifier (opamp or TL431 itself). also compensation could be done in the secondary side. BEST
Most voltage mode controllers allow to set a fixed duty cycle by holding the compensation pin at a fixed voltage, either by a DC feedback network or a voltage source (in case of OTA type error amplifier).
Hi - I'm working on a design that uses a Linear LTC1700. I'm trying to choose values for the parts that sit on the ITH pin, but just want to make sure I'm understanding the type of network that it is using. Looking at the block diagram on page 6, it looks like it has an error amplifier wi
What battery type you use in your system or plan to use?
Dear amu_cpln, if I use a type B thermocouple, which gives 0V between 0 °C and 50 °C, is needed the cold junction compensation? if yes what is its temperature coefficient? Thank you for reply. Roberto
The type of current limiting you're using is a basically a pretty crude control loop. You could get fancy and put an amplifier and compensation network, etc., and get sharper control, but to what end? What are you REALLY trying to accomplish? Do you want to maintain a constant current? A constant voltage?
To me this looks simply like "feedforward compensation" in the feedback ladder. You see it often enough in regulators. Also called "type III" compensation. There should be no DC term, then your concerns about temperature drift (from that) go away. PSRR should be improved at medium frequencies where you are making better use of amplifier (...)
They will cancel, but this is not reason for impossibility. Imagine a system consisting in two cascaded, not coupled parts. The first one can have a pole at some location, and the other one can have a zero at the same location. This type of cancellation is usual in compensation for control systems. Regards Z
Thanks for the help! I'll compensate it with type II compensation network. However I have one more question. The attached figure shows the bode plot for the same converter in DCM. However I've changed the small signal feedback gain a bit. Green line corresponds to k=0.1; blue line to k=0.15 and red on to k=0.2. Simulations (using ideal com
hello can anyone suggest me how to control quasi resonant buck. I had designed the power stage for 2MHz switching operation (resonant freq is 2.7 MHz). In my feedback loop i am using VCO and Eamp with type 3 compensation. I had reffered ON semiconductors appl.nte for the compensator design. The problem is my output is settling at required voltag
You're using an Ahuja type of compensation. It's purpose is to eliminate the RHP zero. Interesting why you see RHP zero that's lower than the dominant pole? Putting a capacitor around M3 may help by reducing the loop gain at higher frequencies but it is not addressing the main problem. To a first order the pmos current sources should not affect th
Can the RHP be dealed with the type III compensation, because the extra zero.
Greetings people. 1) I need a suggestion for a good book that focuses mainly on buck regulator design, single and multi-phase and with good explanation of type-ii and type-iii compensation. 2) I am trying to understand a simple buck regulator's loop stability with a type-ii or type-iii compensator, not (...)
In one of consideration, for PFM with hysteresis type, the voltage ripple caused by ESR of output capacitor should be larger than the comparator hysteresis.
While using SG3524, for buck converter, I need to give a feedback to the error amplifier at pin 1. At the output of the error amplifier (pin 9) I have the Caps and Resistors for compensation. Do the capacitors here need to be ceramic disc capacitors necessarily? Or any specific type of capacitors?? Cannot I use Electrolytic aluminium capacitors? T
Dear Forumites, Has anybody implemented error amplifier for compensation of regulator using Verilog-A. If so can anyone post the verilog-A code which can be used for type-2 compensation. I have tried creating one using model writer, but to the failure. So looking forward for some help. Ni1009
Dear friends , can some one share some details about type-3 compensation simulation for DC-DC development. I have simulated type-3 given in intersil document which i have attached. But whatever i have simulated is bit revese and stange also. So please can some one eloborate/help on this. Ni Hi Ni1009, I don`t know if
members, Need details or reference for type 3 compensation in UC3525 based dc dc converter. I need practical design steps that will be helpful in designing.\ Any member who have access for such design steps details or any software that help for such calculation? Please give your comments/suggessions. Regards, Bharat
I assumed 8 - 10 A because of the 15 mohm inductor Rs in the simulation. This is how I assumed a large inductor was used.You had only 15mohm DCR for your inductor in the sim. If this isn't suitable or doesn't help, a softstart circuit with a series resistor and a FET switch to short it involves most likely the le
hello, Does any reader know of a book that gives transfer functions for opto-isolated SMPS? (ie the transfer function for the opto configuration so that i can do the loop compensation.) Basso book has it but only type 2 and 3 with R(led) and R(upper) connected either side of a little inductor....i don't have such an inductor in my circuit so
Basso's book has an example of type3 comp tl431-opto if I remember correctly. The authors page. It used to be posted here in the forum but no more ,if you know how to search google you should be able to find a copy on one of the file hosting sites without to much difficulty.You want the second
if we use ceremic capacitor (MLCC) as outout cap in voltage mode , we can use type III compensation topology, but if we use MLCC in current mode , what is the compensation structure ? Whether it is still the gm Erroramp which output connects with R-C string or not ? I found that I can't compensate if there is no ESR zero.
Hi, Can anyone plaese tell me how to design an Error Amplifier for voltage mode buck converter.The Error Amplifier is of compensation PI type. I am perticularly inetersted in the design of Amplifier than the compensation. Thanks, Captab
the method you apply to simulation the GBW and the type of your opamp(single end or full differential) will make the "GBW" you got from the AC sweep result different. Do you consider it?
I think ,if I type compensation the err amp is ota. II or III type compensation both ota or op-amp is ok? is it correct?
do you mean a 2-stage fully differential op-amp? what is your amplifier architecture? which type compensation?
How do we analyse temperature compensation in op-amps using spice? I am using spectre for the same. So how can this be done for a bandagap type of circuit?
hi, need help to design /analyse open / closed loop of pwm boost type dc-dc convertor. best if we can have BODE plot to fix those inductor, capacitor,... values thanks in advance.