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Small-signal modeling and control of the quasi-square-wave boost converter

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2 Author(s)
Forsyth, A.J. ; Sch. of Electron. & Electr. Eng., Birmingham Univ., UK ; Gregory, R.I.

Sampled-data techniques are used to examine the dynamic characteristics and closed-loop performance of the quasi-square-wave boost converter. Direct duty-ratio control and current-mode control are considered. With direct duty-ratio control, the system poles remain well damped under all load conditions, and there is no zero in the control-to-output transfer function. Good closed-loop performance is therefore achieved. Under current-mode control, the requirement for a stabilizing ramp is seen to depend on load conditions, and the achievable voltage control-loop bandwidth is smaller than that using direct duty-ratio control; however, there is a significant reduction in the magnitude of the DC source to output-voltage frequency response

Published in:

Power Electronics, IEEE Transactions on  (Volume:13 ,  Issue: 1 )