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Improved control‐to‐output characteristics of a PWM buck‐boost converter |
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| Authors: | Yu‐Kang Lo Jun‐Ting Chen Chung‐Yi Lin Sheng‐Yuan Ou |
| Affiliation: | 1. Department of Electronic Engineering, National Taiwan University of Science and Technology, No. 43, Sec. 4, Keelung Road, Taipei, 10607, Taiwan;2. Department of Electrical Engineering, National Taipei University of Technology, Taiwan |
| Abstract: | An indirect control variable for improving the control‐to‐output characteristics of a Pulse Width Modulation (PWM) buck‐boost converter is introduced in this letter. The voltage gain and the small‐signal model of the buck‐boost converter are reviewed. The actual voltage command at one input of the PWM comparator is from the proposed indirect control variable and the peak value of the high‐frequency PWM carrier. The resulted voltage gain function appears proportional to this indirect control command. Also the dependence of the DC gain of the control‐to‐output transfer function on the duty cycle is eliminated. Experimental results conform well to the theoretical analysis. Copyright © 2010 John Wiley & Sons, Ltd. |
| Keywords: | PWM buck‐boost converter indirect control variable voltage gain function control‐to‐output characteristics |