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Hi,
I know similar kind of topics have been discussed time and again but I cant really get to the soul of 12 V car battery charging system. Can anyone please help me with these.
1. What should be the output voltage of a 12 V battery charging circuit??
2. How authentic is the information of...
Hi,
My current project involves temperature and AC current sensing while temperature is to be displayed on 7 segment displays. 3 displays will be used (temperature resolution of 1 deg is more than enough). Plus, a valve is to be operated proportional to load demand (current drawn by the load)...
I have got a serial programmer for 8051 and it works fine. I have worked with it atleast a couple of thousand times and it has never ever malfunctioned.
My present project involves AVR ATMEGA 16. Both chips are from ATMEL and have the same programming pins exactly at same spot. My question is...
The problem has been solved. All mess was due to some bad/malfunctioning igbt's. Replacing them made the drive work. And even this source of error was discovered accidentally when a igbt blew up (I dont know why) and had to be replaced. That made the bus volatge rise to a significant level...
Ok, I ll try to get my hands on the lab power supply but these days I am not going to the university as a couple of weeks earlier, I had an ankle surgery and cant really move around too much.
Basically I, the controller in this case dsPIC30F3010, and I am using its module which has a built in...
Ok, I have made some progress in the regard of the problem. Two consecutive sparks on the same point made me think that the maybe the power lines of DC bus are coupling on the IGBT board. I rearranged the wiring connections and placed a 100nF (400V) decoupling capacitor. Now the voltage is not...
The situation is really bad guyz. I made a new 300V supply, connected a voltage divider across the output. Following is its circuit.
I took the output of 100V and still the voltage is going negative upto -900V. Then I connected the 300V output (Since IGBT's are rated for 600V), there was a...
I connected the logic ground and low side ground with a 10 ohm resistor in between. Even then, this problem doesnt go away. Since, I have checked the IGBT's countless times, with multimeter and operationally on 12V, therefore, I think there is something wrong going with the DC Bus supply itself...
Yes, the supply is going negative, and I have checked it almost 20-30 times. The IGBt's are good shape as whenever I test them on 12V, everything (literally everything) runs fine, but this weird phenomenon occurs at 100V. As far as measuring equipment is concerned, it is a cheap multimeter (made...
Re: Three phase inverter
Mr. Cool, This is not just a simulation, as I have mentioned earlier, "During testings, I have even fried 2 gate drivers and a 4 IGBT's". All of this has occurred during the hardware development stage. This problem is really driving me crazy.
Three phase inverter trouble
Following is the circuit of single phase of a three phase inverter.
I know I have been around with this circuit (with minor changes) before, but I couldn't help coming here back again with this as I couldn't get it to work. And this time, problem is very weird...
For instance you can use 'ILQ74', it has got four isolators in a single package. The purpose of using the isolator to galvanic-ally isolate the digital circuitry and the power circuitry. So that sensitive and high speed digital circuits do not get affected high voltage/current levels of power...
Firstly, I havent worked on GLCD's yet so I dont really know how are they operated. Secondly, take things slow and step by step when you get stuck. I suggest you disconnect the LCD for now and place LED's at some port. Such that, the number you press gets output at that LED port. In this way you...
Ok, so now its the trouble shooting time. There are plenty of things to check if all the silly mistakes are accounted for but I ll get you started. Before that, I need to know, whats your output i.e. how do you know that button presses are not being recognized by the controller??
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