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20VDC-400VDc Smps feedback type

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babinton

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Hello,
Please, I am in the process of designing a 20 to 400V dc-dc converter but I don't know which type of feedback to use. Should I use an opto-coupler Isolated feedback or can I use a direct feedback consisting of voltage divider network at the high voltage side. I am using SG3524 for PWM control of the converter. Please, any suggestion is welcome and schematic diagram example will be greatly appreciated.
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goodboy_pl

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it depends on the load type, but usually some type of isolation is necessary to prevent electrical shocks. the simplest yet high performance feedback isolation is opto-coupler which consists of a voltage reference (e.g. TL431) and an error amplifier (opamp or TL431 itself). also compensation could be done in the secondary side.

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babinton

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it depends on the load type, but usually some type of isolation is necessary to prevent electrical shocks. the simplest yet high performance feedback isolation is opto-coupler which consists of a voltage reference (e.g. TL431) and an error amplifier (opamp or TL431 itself). also compensation could be done in the secondary side.

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Thanks for your reply, please can you point me towards a good refrence design that i can use as a guide for my analysis. Also, are there any other simpler method for feedback design. As you said in your reply, the dc-dc is an intermediate boost state in my design of an SPWM inverter.
 

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