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  1. H

    Does a 3-phase phase-locked loop diagram possible for an AC to DC battery charger?

    Yes. Very reasonable feedback. Thats what I wanted to figure out. PPL has significant contribution on phase error. DSP sampling techniques can identify it properly. I found only things for single phase, the equations I posted somehow it comes from any good journal. Beside hermonic...
  2. H

    Does a 3-phase phase-locked loop diagram possible for an AC to DC battery charger?

    If you take a look on the equation dont you imagine, A,B.C phase with 3 dimension converted to d,q vector field. Take a look this for single phase , Can you understand which part has reactive element and angular function. d, q both depends on theta. Yes, my control system also has zero-cross...
  3. H

    Does a 3-phase phase-locked loop diagram possible for an AC to DC battery charger?

    Yes well said. It has the 6 switch bridge , I think my system has leading PFC, because it does not have resistive load ( just when I test it with R), lets think battery works like a capacitor. Look at the datasheet of HF IGBT from infenon. I am using 6 pulses but with a different fashion...
  4. H

    Does a 3-phase phase-locked loop diagram possible for an AC to DC battery charger?

    Hi there, In order to achieve unity power factor control, the phase of the AC voltage needs to be obtained. The phase is obtained through a phase-locked loop (PLL). Take a look for single phase control structure of the PLL , For such similar way I want to mention some of 3-phase equations...
  5. H

    [ARM] How to check external watched dog IC when toggling MCU oscillator?

    Purpose is updated Firmware works or not or does it fits with H/W. Not for a long time, didn't you see on off switch/ interrupt switch? KRA105S and KRC105S are suitable couple. You didn't view full picture, there is nothing can kill E or C. What level of current do you expect ? does this...
  6. H

    [ARM] How to check external watched dog IC when toggling MCU oscillator?

    Hi There, I am working with a MCU STM32F405VET for any particular purpose. Lets say at this time firmware code has burn on MCU. Lets talk about HW issue. Take a look the datasheet here https://www.qdatasheet.com/datasheet-download/190671/1/ST-Microelectronics/STM32F405VET6 In my design...
  7. H

    [General] AC/DC bidirectional battery charger/discharger Firmware/Hardware simulation

    Hi, My project diagram is similar to this idea, Lets say input is 3p 380VAC, 60Hz, Main Transformer MTR runs at 20kHz, DC output should be 50-147 v, charging current 100A. Should have CC and CV mode of operation. I need to implement FW with following facilities, 1. Shunt/ Temperature...
  8. H

    Panasonoc Ni-Cd battery condition and charging circuit

    Dear Sir Audioguru, Well come back! Hope in this pandemic you were safe and healthy. I think It should work. Calculation says charging time will be less compared to predicted one. "State of charge " and how quickly it will discharge is a fact. I got a good result with 4.7 volt Lithium...
  9. H

    Panasonoc Ni-Cd battery condition and charging circuit

    One of the promissing and knowledged based reply for sure. You started from PS design, at the beginning all rectifier section contains ripple or pulsating DC might appear, depending on charger/PS design. Since I have a complete product then transformer or AC components should not get priority...
  10. H

    Panasonoc Ni-Cd battery condition and charging circuit

    I got your point but not much clear view on it. You want me to use some current limiting techniques. Take a look this idea Yes, it is easy to see how fast this battery can discharge. If you add 18 ohm in the emmiter path then the battery will get 100 mA. In put voltage should be 6.5~10 Vdc. I...
  11. H

    Panasonoc Ni-Cd battery condition and charging circuit

    Well said. In previous comment I understand why you want me to apply charging current 130mA because 10% of capacity represents charging current. Now beside high and low impedance batteries or internal resistance power consumption s I got a idea. I had another charger for Sayno 1400 twicell...
  12. H

    Panasonoc Ni-Cd battery condition and charging circuit

    I have 3 chargers , let me know which one is best. Some has lost their stability. 1. 9 v /800mA ( witten as 6v/300mA 2. 10 v/ 880mA( written as 7.5V/300mA) 3. 12 v/900mA. For whole battery pack those are not suitable you said.
  13. H

    Panasonoc Ni-Cd battery condition and charging circuit

    Thank you for such comments l. Yes, reverse polarity might kill others. Did you see my posted circuit , its not used for peak voltage detector? If I just charge single one then do you have any circuit in your mind using LM358 or LM317?
  14. H

    Panasonoc Ni-Cd battery condition and charging circuit

    Hi There, I got a part of vacuam cleaner machine driven by DC charger. May be it was manufactured in 2018. User might through it away because it was troubling. 9 pcs of P-130SCS 1.2V 1300mAh has joined togeter to get 1.2×9 Vdc...
  15. H

    Does this IGBT bridge meaningless ?

    Question arises if both node remains constant on polarity then why 4 igbts are used? One leg of primary TR connected with a pair of IGBT doesn't tell us that its polarity could interchange? Don't you mean the circuit is not wrong?
  16. H

    Does this IGBT bridge meaningless ?

    Hello My Dear Friends! Hope this post finds you well. I am trying to develop a AC to DC rectifier 110V/50 A range. Feeling that I am doing wrong on making the full bridge or half bridge portion. The IGBT module I am using is...
  17. H

    MOC3020/BTA41 circuit problem

    Dear Sir Klaus, Yes, my system is 3-phase , but "Two Leg SCR Power Control" type, consider only TRIAC here instead of 2 parallel SCR. I am trying to use TRIAC because it conducts both side of current. Not sure what you are trying to say, but if it goes behind theory, let me know. Consider...
  18. H

    MOC3020/BTA41 circuit problem

    How about your knowledge about 380VAC/40A RMS application for similar application? Take a look my problem here.....https://www.electro-tech-online.com/threads/ssr-internal-resistor-wattage-setting.158001/
  19. H

    Seeking for zerocrossing switching without using microcontroller

    Datasheet tells us to calculating snubber circuit. Damping, Transisent, Resonance all are considerable. But for 380Vpk, 40 A, PF=-0.9 capacitive load, what would be wattage of resistor 360R,39R,340 R? Maximum 3W? My pcb need more space ?
  20. H

    Seeking for zerocrossing switching without using microcontroller

    Could you kindly see here, https://www.st.com/content/ccc/resource/technical/document/application_note/38/88/44/b8/2c/26/44/b8/CD00004096.pdf/files/CD00004096.pdf/jcr:content/translations/en.CD00004096.pdf

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