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Recent content by Ogbachi

  1. O

    PWM Generator and Control

    FvM, Thanks for your response. Please advice me on the driver to deliver sufficient gate current for fast switching 100 A range and PWM generator that will output two PWM of 180 degrees out of phase with adjustable dead time. I have searched and i don't know the one to select. Thanks for you...
  2. O

    PWM Generator and Control

    All, Please, i need your help on the clock sequence as in the previous post and attachment. Thanks, Ibrahim.
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    PWM Generator and Control

    mtwieg, Thanks for your response. Based on your recommendations, i am now considering IXFK170N20P as my Power MOSFET with 170A and 200V I am trying to reduce the number of phases due to complexity. Please look at the attachment below, i am not clear on how to connect the LTC6902 to the...
  4. O

    PWM Generator and Control

    All, I am working on 2-phase interleaved bidirectional dc-dc converter as shown in the circuit below. I have not been able to find answers to the following questions running through my mind. The questions are: 1. How do I generate two independent PWMs of 180 degrees out of phase with dead...
  5. O

    Proteus- Timestep Too Small error Message

    BradtheRad, Many thanks on your response. R11 is 1.0 Ohms, is anything wrong with selection? You are right, Q1 gate was not connected but when it was connected it did not change the previous result. Can you assist me to look at the coupled inductor connection if that is the proper connection...
  6. O

    Proteus- Timestep Too Small error Message

    BradtheRad, Please find attached pdf copy below. How can ringing in a coil be eliminated? I do not have capacitor close to the coil. Thanks.
  7. O

    Proteus- Timestep Too Small error Message

    BradtheRad/Dick, The timestep too small error message has been resolved by installing 1k Ohms between gate and source. The voltages and current measured are as calculated but wave form not looking good- very high oscillation. From the Oscilloscope, the inductor current is oscillating. Find the...
  8. O

    Proteus- Timestep Too Small error Message

    All, I am unable to run my simulation using Proteus software. It pops out ''timestep too small error message'' Can anyone help on how to proceed resolve this? Please find the attached file below. Could anything be wrong with the design? The driver works well when run separately. Please help...
  9. O

    Proteus Simulation of 2-Phase DC DC Converter

    FvM, Many thanks on your quick reply. I will use TC427 to see if it will drive the switches. For the 1k, the resistor value was not stated on the data sheet, i selected 1k to start with, Is there formular to calculate for this? What of the capacitance value selected, is 1uF ok? Please can...
  10. O

    Proteus Simulation of 2-Phase DC DC Converter

    All, I am working on 2-Phase DC-DC Converter simulation using iSiS 7.8 Proteus Software. The gate driver is unable to drive the circuit. Please assist me to look at the attached simulation to spot where i am getting it wrong. This is my first time of using this software for circuit...
  11. O

    2-Phase Interleaved Bidirectional DC-DC Converter

    FvM, Many thanks on your response. Comments well noted. I selected coupled inductor to reduce inductor ripple current. Please, can you assist me to look at the possibility of using two-phase interleaved switches considering the input current is greater than the Drain current of both switches...
  12. O

    2-Phase Interleaved Bidirectional DC-DC Converter

    FvM, Many thanks on your quick response. Your comments well noted. I have another concern: From my calculations i observed input current will be around 210.53A with 95% efficiency and peak inductor current will be around 252.636A. I would want to ask using two parallel switches of each drain...
  13. O

    2-Phase Interleaved Bidirectional DC-DC Converter

    All, I am working on my final year project: 2-Phase Interleaved Bidirectional DC-DC Converter with coupled inductor. I have two circuits diagrams as shown in the attachment. Please advise which of the cirduit diagrams will be most suitable for my design. My design specifications are: Input...
  14. O

    DC-DC Boost Converter - High Current Design

    Many thanks. I really appreciate your comments. I have searched the web and found Dual 5-A High-Speed Low-Side Gate Driver-UCC27523, hope this will be ok? How do i determine my inductor and capacitor sizes? Thanks......
  15. O

    DC-DC Boost Converter - High Current Design

    Many thanks, i appreciate your suggestions. I would also want to consider different MOSFET-MTP75N06 and gate driver SG3525, what is your advice on this? Also, how do i achieve input current >200A and the corresponding inductor size? Will dual phase topology involve transformer? How do i design...
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