Review Questions
3rd part 23. Does the conventional buck-boost converter require the connection of smoothing capacitor in parallel with the load?
24. What is the difference of the source and load circuits of the conventional and Cuk buck-boost converters?
25. What buck-boost circuit has harder operation mode of the same power transistor — conventional or Cuk — and why?
26. What is connected in parallel with the load in Cuk buck-boost circuit? 27. Is Cuk buck-boost converter characterized with the polarity of load voltage reverse to that of the source?
28. Is it possible to implement a buck-boost circuit with the polarity of the load voltage coordinated with the source? What is this circuit?
29. Does SEPIC buck-boost circuit require a smoothing filter of the source current and smoothing capacitor for the load voltage?
30. What is the ratio of the average value of load by-pass inductor current to the load current in SEPIC buck-boost converter?
31. What is two-quadrant 2Q DC-DC converter and how is it applied in the control of DC motor speed?
32. What connection of the semiconductor switches should be used for reversing of load voltage polarity?
33. At what part of supply voltage do the bridge-type and half-bridge circuits operate according to the load?
34. What is the reason to by-pass each s/c switch of unidirectional conductivity with a reverse diode?
35. How to control the diagonal transistors of a full bridge DC-DC converter to
obtain single polarity load voltage? Does a half-bridge circuit allow for singlepolarity modulation?
36. Is the energy accumulated in the load inductance in the case of single-polarity modulation «discharged» through the bridge diodes to the source?
37. What is the double-polarity coordinated modulation of a reversible DC-DC converter and how is it implemented?
38. What does the average value of the load voltage of coordinated double-polarity modulation in reversible pulse converter depend on?
39. How large is the average value of load voltage in the case of double-polarity
modulation of reversible pulse converter if within the modulation interval the transistor switches of both diagonals are switched alternately and for same time intervals?
40. Within what range can the control DC voltage signal be changed and what is
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