# Search results

1. ### [SOLVED] grounding question for inverter circuit

grounding question(not yet solved sorry) Should our inverter driver(mcu, opamps,ir2112) have the same ground with our dc link(rail which is almost 450V)? our circuit is like what is in section 6(inverter section) of this pdf **broken link removed** now we don't know if the our DRIVER's...
2. ### IR2113 short after running

we measured the current from the output of the inverter to the run terminal, it was only 0.052A max. where in normal operations(plugged to the outlet) the current is around 0.5A, how can we generate more current for the ref to run in normal conditions?
3. ### IR2113 short after running

We're trying to run a refrigerator by using inverters. At first we observed what is happening on the relay when the refrigerator is plugged at the outlet. It clicks and then the refrigerator starts(vibrations and sounds coming out from the compressor). THen we tried using the relay to with our...
4. ### IR2130 + 3 pahse inverter

i have a question. What resistor value should you use on the CAO pins. There are 5 resistors there, and i dont know what values to use
5. ### H-bridge IGBT inverter problem on motor

What would be the effect if we increase the value of the capacitor?[COLOR="Silver"] ---------- Post added at 10:45 ---------- Previous post was at 10:36 ----------
6. ### H-bridge IGBT inverter problem on motor

We used a bridge rectifier which is 35A, 600V. We just used the 1n400X for multisim to see our schematic. a side question. If there is a rating in the data sheet of the rectifier that says "35A,600V" does that mean that is its maximum limit when it comes to its input? Are you saying the value...
7. ### H-bridge IGBT inverter problem on motor

So your saying i should check the HO and LO pins of my driver when the load is the refrigerator? we are hearing a ticking noise, so be believe we must be inputting something in the refrigerator. we just have a theory that our voltage rail might lack the current needed to run the compressor in...
8. ### H-bridge IGBT inverter problem on motor

- Yes our input voltage come from the outlet. - we didn't use an isolation transformer before the rectifier. what you see in our schematic is our actual circuit. - We can still adjust the PWM duty cycle through programming, just an info... we used 5kHz switching speed - We measure the Bus...
9. ### H-bridge IGBT inverter problem on motor

Hi FvM, sorry for the confusion. here is post #4 and #10 we combined it actually. The transistor inputs are SQUARE WAVES. The H-bridge creates an AC voltage due to alternate switching of the transistors as we have programmed. since u mentioned that there was something wrong w/ the circuit on...
10. ### H-bridge IGBT inverter problem on motor

Hi kabiru. this is our inverter circuit... not exactly but the concept of the H-Bridge and drivers are the same. what do you mean feed back loop? https://images.elektroda.net/29_1303848654.gif
11. ### H-bridge IGBT inverter problem on motor

Hi kabiru. what do you mean by we didnt connect the feedback loop?
12. ### H-bridge IGBT inverter problem on motor

what do you mean H-bridge driver?
13. ### H-bridge IGBT inverter problem on motor

Ok, how would we increase our supply? Do you have any suggestion for a High Voltage supply circuit? This is our current schematic.... we used this since it has no transformer we saw something about "Voltage Doubler" Circuit. Is this circuit good enough?
14. ### H-bridge IGBT inverter problem on motor

Our H-bridge IGBT inverter with DC rail of 315V is working on an industrial fan with voltage of 230VAC across it. now when we used the same circuit in running our refrigerator, given that the voltage across out inverter is 230VAC, the refrigerator wont start and started clicking. we think its...
15. ### Compressor click sound

oh ye i forgot about our schematic. we used an H-Bridge configuration since our aim is to control the speed of the motor by changing the frequency of our inputs in the switch. Our input in the IGBT are PWM. Our Rail voltage is 220VDC and we convert it to AC through switching of the...
16. ### Compressor click sound

After applying 200VAC from the igbt driver, all we hear is a clicking sound. it doesn't turn on the compressor. any suggestions how to fix this? thanks!
17. ### PWM duty cycle problem

nope. it would stay the same. lets just say that the unsign_pwm = 150;
18. ### PWM duty cycle problem

@KerimF: im sorry i didn't put the entire code. the unsign_pwm is a variable output of the ADC. can you tell me how can i return back to the original duty cycly if im going to keep the + sign? thanks.
19. ### PWM duty cycle problem

runtime error. the compilation is successful but using the simulator PROTEUS, it says that the error is within the CALL stack.
20. ### PWM duty cycle problem

thanks for the replies @bjuric: i've already done than that but still it gave me errors in using the simulation proteus. is there another way to create such wave form? @andre_teprom: the desired output is a pwm duty cycle that is increasing up to a point then returning back to the orignal...