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Assist me in designing a variable voltage switch mode power supply

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yazdanpanahi

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hi everybody
I would like to know if anyone could help me or conduct me to find a circuit of a variable switching mode power supply that has an input between 160-250 Vrms and a variable output voltage between 0-65 V and output current between 0-2A.
I'd really appreciate if any one could conduct me to find the circuit.
thanks in advance
 

Keith Billings book Switch mode power supply handbook has a design for a 300 watt supply that covers that range.
Chapter 24 has full discussion about the design approach, and full schematic.
Chapter 25 has full details of design and construction of the relevant magnetics.
The rest of the book is a priceless reference of switch mode design theory and practice.
https://www.amazon.com/Switching-Po...qid=1475017023&sr=1-2&keywords=keith+billings
 

variable output voltage between 0-65 V and output current between 0-2A
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A wide range of voltage and load. Do you wish it to be voltage regulated? Then it requires care as you design the control circuit. It needs to be versatile so it can handle the extreme limits of your spec. Perhaps you wish to draw low voltage and low Amperes? Then it requires a very short duty cycle, and/or low switching frequency.

One option is to construct your project as two stages: (a) fixed-output buck converter reduces 160-250V supply to 65V, then feed output to (b) buck converter reduces 65V to arbitrary voltage set by user.
 

BradtheRad said:
A wide range of voltage and load. Do you wish it to be voltage regulated? Then it requires care as you design the control circuit. It needs to be versatile so it can handle the extreme limits of your spec. Perhaps you wish to draw low voltage and low Amperes? Then it requires a very short duty cycle, and/or low switching frequency.
Click to expand...
This is all very true.
Its an extremely difficult and complex project to tackle, you need a lot more than just a bare schematic of perhaps questional origin found somewhere on the internet.

Which is why I suggest you buy a book that not only has all the details, but WHY it was done in a particular way.
 

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