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high voltage feedback circuit..

hello,

i had designed a flyback circuit with high voltage output (about 1kv and 40 watt)
I want to use topswitch on my circuit but i cannot find a solve about that; how i will desing feedback circuit. how can i reduce the voltage for optocoupler?

‹ 6 to 8 1w led in series led driver circuit DPA425 slow response/overshoot on step load change ›
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4 replies  |  Created on Apr 2, 2009 11:04 AM by Community Member instinct
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High voltage feedback
Posted: Apr 3, 2009 | 10:46 AM

Hi,

One way to solve this problem would be to use a potential divider for sensing the output voltage and supplying the optocoupler from a low auxiliary supply voltage.

With this arrangement, you will still be controlling the high voltage output of your power supply but the optocoupler will be connected to a low voltage source.

Regards

PI-Sarek

Power Integrations Moderator PI-Sarek  |  401 posts
You may try to put several
Posted: Apr 2, 2009 | 15:39 PM

You may try to put several Zener diodes in series in your feedback circuit to solve your problem.

Community Member Jiangming Yao  |  205 posts
thanks
Posted: Apr 3, 2009 | 00:14 AM In response to You may try to put several

okey, i will try this method.. thanks for all

Community Member instinct  |  16 posts
okey, i will try this method...
Posted: Mar 23, 2010 | 07:03 AM In response to thanks

Hello, I have similar voltage on the output of the transformer but less power.

Are you successfull by using more than one zener diode in serie.

Pascal

Community Member Pascal  |  1 post