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回复 #58 millwood 的帖子
Hello millwood,
Thanks for starting this thread.
I'm also trying to make a UCD by using IC gate drivers but still not yet get it done. Those drivers are very easy to blow and I did several times just because of careless mistake.
I took an approach to develop the circuit stage by stage. Following is my sequence,
1. Get a triangular wave from a Signal generator or generate it from a simple opamp circuit.
2. Feed the triangular wave and the ground signal to a comparator. I'm using LT1016.
3. Level shift the comparator output down to the negative rail.
4. Implement a dead time generator for the pair of PWM signals. I used a XOR gate, a cap and a resistor to do the job.
5. Feed the final PWM signals with dead time to the IC gate driver. I tried UCC27201, HIP20101, LM5101.
6. Feed the output of the gate driver to a half bridge mosfet network.
7. Feed the output of the mosfet to the low pass LC filter.
8. Measure the signal delay from comparator to the output of the low pass filter, calculate the value of RC network for self oscillation and finally remove the siggen input and complete the feed back loop
I'm still at step 6 today. I found the fast rise and fall of the IC driver output make transient and ringing of the mosfet output very difficult to control. I plan to make a PCB to do the experiment.
Hope this helps.
BTW, have you checked this thread in diyaudio.com?
http://www.diyaudio.com/forums/showthread.php?postid=778406
Cheers |
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