Author Topic: voltage regulation using TL494  (Read 535 times)

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Offline anshuii

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voltage regulation using TL494
« on: May 27, 2022, 02:31:11 am »
I am using the given schematic for voltage regulation using TL494. When feedback is not given, that is point A and B are not connected, then I am getting a pulse of 35% duty cycle of 0-12V. But when the feedback is given ( A and B gets connected), then in the output I am getting a 12V DC rather than a pulse even though the positive and negative terminal of error amplifiers have some difference of voltage and there's a sudden large amount of current flow at point C and D that is the primary side of the transformer. I am not understanding why the pulse is getting vanished with 12V dc and sudden large  increase in current( i. e from 0.8 A to 1.6 A) in the primary side of the transformer circuit . Is there any blunder in the schematic.
 

Online T3sl4co1l

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Re: voltage regulation using TL494
« Reply #1 on: May 27, 2022, 06:36:53 am »
Use emitter output instead. ;)

Tim
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Offline anshuii

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Re: voltage regulation using TL494
« Reply #2 on: May 29, 2022, 07:06:29 am »
still the issue remains same
 

Offline Alex-lab

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Re: voltage regulation using TL494
« Reply #3 on: May 29, 2022, 09:31:21 pm »
It looks like too high gain for error amplifier (x56). As desired output of 20V corresponds to 2V ref, the 1/10 divider is enough, and further amplification is not necessary.
Try to put 1k resistor instead of 56k (pin3).
 


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