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Understanding Buck/Boost Converter Operations and Parameters

Explore the inner workings of buck/boost converters, from inductor and capacitor currents to switch and diode operations. Learn how to optimize parameters for efficient power conversion.

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Understanding Buck/Boost Converter Operations and Parameters

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  1. Buck/Boost Converter Boost Converter Switching Converter Buck Converter IIN IO + VOUT - + VIN -

  2. Buck-Boost Converter : Inductor Current iL iL,max m1 m2 IL IL,crit iL,min t1 =DTS t2 =(1-D)TS TS = t1+t2

  3. Buck-Boost Converter : Switch Current iL iL,max IL DIL iL,min t1 =DTS t2 =(1-D)TS TS = t1+t2

  4. B/B Converter : Forward Diode Current iD = -iO iL,max IL DIL iL,min t1 =DTS t2 =(1-D)TS TS = t1+t2

  5. B/B Converter: Capacitor Current – High Po -iC DIL + DQ 0 - DQ IO t1 =DTS t2 =(1-D)TS TS = t1+t2

  6. B/B Converter: Capacitor Current – Low Po iD tx IL,max DIL + DQ 0 • - DQ IO t1 t2 TS = t1+t2

  7. Switching Converter Parameters Reverse diode for VIN < 0 DCM if IO/IO,cr < 1

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