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  1. waveboy

    Comparator input bias current in STM32L073 micro?

    Hi, The attached comparator circuit takes in some pulsing and turns it into a rail to rail pulsing. (LTspice and PNG attached) However, when no pulses come, the signals at the input to the comparator are just 100mV apart. Also, it is the comparator inside the STM32L073 microcontroller, which has...
  2. waveboy

    Comparator input bias current in STM32L073 micro?

    Thanks, BTW, Do you know if this comparator input bias current is more likely to be coming into the comparator's input pin or out of it?
  3. waveboy

    Comparator input bias current in STM32L073 micro?

    Hi, Do you believe that the attached LTspice simulation is the best way to analyse the effects of the input bias current in one of the comparators inside the STM32L073 (48 pin) microcontroller? STM32L073 datasheet https://www.st.com/en/microcontrollers-microprocessors/stm32l073rz.html I...
  4. waveboy

    Why not have a combined LISN/Spectrum analyser for conducted EMC?

    Hi, This concerns conducted EMC testing for offline SMPS They use a spectrum analyser and a LISN. The spectrum analyser can be irepairably damaged by.. 1....the detector in the Spec Anal getting overloaded by the input from the LISN 2...The RF input of the SPec An getting overpowered...
  5. waveboy

    Burst Mode SMPS wont fail EMC

    Hi..........its amazing how a massive number of Power electronics company staff think that a burst mode SMPS is worse at EMC , than a standard frequency compensated SMPS.....which if course, is totally not true....neither does it fail flicker. I once worked at a co, where they had a 600W UV...
  6. waveboy

    Difference between HV and LV output LLC converter?

    From what i see, there is essentially no difference in an LLC for 15kv, 2kw output, and an LLC for 2kw, 200V output. ...other than the obvious different turns ratio....and the need for special HV isolation material and clearance. Also the fact that you are forced to do an "Integrated...
  7. waveboy

    SMPS feedback compensation error amplifier with finite gain at DC?

    Here is the PDF schem, i coudlnt upload it in the same posthttps://files.engineering.com/getfile.aspx?folder=a52a0abe-a46a-4ed5-b3c5-7c408c1ea802&file=1kW_Buck_battery_charger_with_DC_feedback_path.pdf
  8. waveboy

    SMPS feedback compensation error amplifier with finite gain at DC?

    Also, please could you assist in finding the gain and phase margin of the attached 1kW buck battery charger...PDF schem and LTspice sim attached. The U2 based error amp kind of rules the roost...setting the reference for the U9 based error...
  9. waveboy

    SMPS feedback compensation error amplifier with finite gain at DC?

    Thanks, and as you know, there is a type 1 error amplifier, and a type 2b....type 2b is a type 1 but with a resistor connected in pllel to the capacitor. As you know, the resistor in this place reduces gain at DC......and usually, the power stage poles and zeros in an SMPS mean that the last...
  10. waveboy

    SMPS feedback compensation error amplifier with finite gain at DC?

    Thanks, what applications usually get a type 2b error amp in smps?....type 2b is just R and C in pllel in feedback of opamp
  11. waveboy

    SMPS feedback compensation error amplifier with finite gain at DC?

    Hi, You have type 1, 2 & 3 error amps for SMPS feedback compensation... But what is the error amp called that is just a high gain inverting amp?...ie, not an integrating error amp. Also, can you confirm, that using this (unknown name) error amplifer, there is no gaurantee in eg a Buck battery...
  12. waveboy

    Power consumption of fan at increased voltage

    Thanks, Apologies to CompositePro...."PMSM" is what i confused with "PMDC"
  13. waveboy

    Power consumption of fan at increased voltage

    Thanks, a PMDC is a type of brushless motor...but may also be a term used for a brushed one, i dont know. And now i am ashamed of myself, because there is (generally) a difference between a PMDC and a BLDC, and i have forgotten it.... I think a PMDC has sinusoidal air gap field, but a BLDC has...
  14. waveboy

    Power consumption of fan at increased voltage

    Thanks, yes because we need to drive two of them from a TPS54070, which has a peak current limit of 0.6A, so if the 2 fans draw too much current , then the buck wont be able to supply them. Vin is 31-36V. (To the buck)
  15. waveboy

    Power consumption of fan at increased voltage

    Hi, Do you know what the power consumption of the 624HH Papst fan is at voltages from 18-30V? 624HH fan https://img.ebmpapst.com/products/datasheets/DC-axial-fan-624HH-ENU.pdf?_ga=2.173156963.1761286910.1643461652-146278518.1643461652 Its rated 18-28V, but we intend to run it mainly at 30V...
  16. waveboy

    How to design a single phase , 50Hz, 240VAC inverter (grid tied)

    Yes, we could buy an excellent one from China. However, we need it to last >10 years, and so we will need to work with the manufacturer over the years to put right any failure points as they (possibly) show up. The Chinese are great people, they are genuinely decent and superb. China has become...
  17. waveboy

    How to design a single phase , 50Hz, 240VAC inverter (grid tied)

    Also, here is the schem of the GTI attached (i dont think you can have more than one attache per post?)https://files.engineering.com/getfile.aspx?folder=fde36c36-17f9-4abc-95a5-d0f802b966a9&file=Grid_Tied_Inverter.pdf
  18. waveboy

    How to design a single phase , 50Hz, 240VAC inverter (grid tied)

    Do you think the attached would be OK to take forward as a Grid Tied inverter? It puts a sinusoidal current into the mains. Is mostly analog...would just need some software to generate the sinusoidal reference and do all the protections needed for a GTI. (LTspice of grid ited inverter...
  19. waveboy

    How to design a single phase , 50Hz, 240VAC inverter (grid tied)

    sorry, i am going to have to learn how to attach more than one file here...back soon ..for some reason i cant upload the ltspice sim?
  20. waveboy

    How to design a single phase , 50Hz, 240VAC inverter (grid tied)

    Thanks, reference GTI's......they have no current control...they cant, because the current drawn from them depends on the loading of the phase........they have no voltage control...the voltage at their output is determined by the mains. The GTI's only have current and voltage limiting. The...

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