James Bond

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About James Bond

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    Mexico,Lerdo Durango

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  1. well i was workig in the control of the induction heater and i put a lcd 16x2 so you can set power and time before start work, i change the tank circuit because my friend Joshua C. told me than the old one waste a lot of energy. and he was right. cooler sistem its a very bad idea but works fine four 12vdc high flow fans and two computer radiators. jeje thanks Joshua C. the system works grate at 4 kw and and I think we can get up to 7kw.
  2. ok i was very bussy this weeks because my job its very demanding, but i finally finish the new control, it works very fine in the induction heater because my goal is to maintain the current stable no matters the size of the piece or the heat or the material and i can say this thing works fine. also i introduce a safty control if something gone wrong.
  3. hi my friend joshua on the internet I have seen some very interesting concentrators. for example the induction cookers They have some ferrites under their coil that I suppose serve to concentrate the magnetic field upwards of the coil and in this way do not waste energy. I am right? I send you an email my email is email removed I attach an image and a link to a video on youtube 3:16 https://www.youtube.com/watch?time_continue=5&v=jOg8Q-jt1BY https://www.youtube.com/watch?time_continue=2&v=Dsc8vzSQDP8
  4. I am not the great student of electronics that you think and I do not know many things about many subjects. My main problem is that I do not know many people who know about the subject of induction furnaces. I would like to have some mail or something to be in contact with you. Today I have several doubts. I have seen a material called flux that serves to concentrate the field of induction coils. it is very expensive. Is it possible that some more common material will be useful for this experiment to concentrate? since for example I would like to make a coil like the induction heaters but concentrating the field above the coil. I am trying to make a current sensor by measuring the input current from the input line and not from the inverter. is this ok?
  5. when i heat some material the current rises and it can be dangerous i need a current control. first i need mesure current. if a have advances i will post .
  6. ok let's se point 1: come on!! a Variac !?! come on........... 220VAC line point 2: That is a good idea point 3: I don't have a power factor meter but each blue cap are 1uf/250vca so i have 2uf total. point 4: yea! GDT!!!!. hybrid drive are very expensive and you need 4 and 4 dc-dc powers supply if you know for some cheap let me know. point 5: we need to discusse this point. I'm working with pic microchip and i have a range from 10khz to 500khz . i dont know anything of Atmel microchip but i understand a little bit your power stage controll and im in love with this ...it's a shame that in the web nobody explain the power stage controll. in mexico nobody knows about atmel. you can controll the power of your unit always at resonance... boss! point 6: well i can do this ..but later point 7:ok i have two more that I can stack. i think i'm saturating this one . they are 3c90 material chinese units haha point 8: thanks i have to do that my new friend josh thanks for your time and help me
  7. since now I'm using a pair module igbt. and im workin with 240vca. and i have a new board too. Im working at 245vca and the induction heater consume 25 to 23 amps. 6KW of power for small pieces its ok !! i can melt 5 or 6 oz of cuper in 5 miutes i think its a big step. this induction heater works fine very well but if i want go to higer levels 15 kw for example i need to do another topology but not now maybe 2018.
  8. i finish the full bridge inverter i have some problems but i think we are ready i think this induction heater cosumes 20amp at 120v 1phase i will show you a video.
  9. Everything seems to work fine, I try to work with a complete bridge inverter But I have several problems, The most important of them is the following, when the piece begins to heat its resistance begins to decrease and as it is in resonance the current rises to high levels so that I need a good control of current, Going out of resonance frequency does not seem a good method to me since this stresses a lot to the igbts and the power factor is bad. I would not like to use a controlled rectifier as it would increase my costs by having to buy half power scr as well as generate pulses and blabla bla The real problem lies in the topology .... since it is the most common topology and most used by home induction furnaces. Is a good topology but it has weak points a disadvantage of this kind of topology is that the heater will pull huge current when it run at nun load situation.and you have to put a current limiter to protecting your circuit in fact your heater power has hardly increasing with decreasing of load resistance. LCLR matching network has a gear ratio that varies with load resistance.actualy when you put a heavy load into the workcoil the gear ratio will be highest and your current will be low.and reverse in null load. and also your resonant frequency will be change . another disadvantage of this stuff is that for increasing the output power you have to decrease your matching inductor value and this is not good beacause the matching inductor supresses the current spiks of the inverter .and when you decrease. it cause this current spiks to damage your transistors