Fast-Transient Response DC-DC Converter with Low Output-Voltage Ripple," for Journal of ICT Research and Applications. Titlen er Development of Fast-Transient Response DC-DC Converter with Low Output-Voltage Ripple. 34; Development of Fast- Transient Response DC-DC Converter with Low Output-Voltage Ripple," for Journal of ICT Research and Applications.
I have now completed my review of "Development of Fast Transient Response DC-DC Converter with Low Output Voltage Ripple" for Journal of ICT Research and Applications and my recommendation, "Accept Submission." submitted.
The boost-stage
Meanwhile, in the transfer stage, the power switch 𝑆𝐴 turns off and the energy stored in the boost inductor is released and becomes a boost-trap output current 𝑖𝐴. The changes of output current ∆𝑖𝐴 and output voltage ∆𝑣𝐴 within one switching period 𝑇𝑆 can be derived as. 2𝑣𝐴2𝐿𝐴 (8) The relationship between the changes of the output current ∆𝑖𝐴 and the voltage ∆𝑣𝐴 can be derived as. 9) clearly established an opposite trend between both parameters.
Therefore, the stability of the output voltage suffers from the change of the output current when a buck-boost converter is operating in boost mode.
The Buck-stage
This fundamental problem implies that increasing the output current causes the output voltage to decrease and vice versa. Meanwhile during the discharge phase, the current switch 𝑆𝐵 turns off and the energy stored in the back inductor is released into the output capacitor and supplies the load. When the phase reaches steady state, the output current in the DCM can be calculated as
𝑇𝑆𝑣𝐴 (16) The state of the output current where the derating rate is at the boundary between DCM and CCM is.
The Operational Principal of The Boost-Buck Converter
The proposed boost-buck DC-DC converter is designed to achieve faster transient response with smaller output voltage ripple. In a buck-boost converter, the increase in the duty cycle of the boost stage introduces the drop in output voltage. Despite this fact, as long as 𝑣𝐴 is greater than 𝑣𝑂, the output voltage can be properly held constant by the buck-trap.
These phenomena cause the output voltage ripple of the proposed converter to be lower than that of a conventional boost converter. More time for the transfer phase increases 𝑖𝐷 and causes an upward violation in the output voltage. In the proposed converter, when the output current changes, the step-down rate determines the corresponding duty cycle adjustment amount according to Eqs. 13) or (16) to vary the current of the bucking inductor to keep the output voltage constant at the nominal value.
By comparing the transient response time and output voltage ripple between the buck converter and the proposed converter in Figure 3 and Figure 4, it is clear that the transient response time of the boost converter is shorter than that of the buck converter. The proposed converter can provide better output voltage ripple 𝑣𝑟 when driven by large output current and step-down operation in CCM. However, the proposed boost converter provides better output voltage quality due to lower output voltage ripple.
Thus, the proposed boost-buck converter is suitable for practical applications, featuring extremely fast transient response and low output voltage ripple. By setting the common capacitor voltage higher than the output voltage, the buck stage combines the energy stored in the common capacitor to maintain the output voltage at the nominal value.
The 1 st comment
The 2 nd comment
Introduction (Last paragraph)
Introduction (Last two paragraphs)
- The 3 rd comment
- The 4 th comment
- Results and Discussions (the last paragraph)
- Results and Discussions (the last two paragraphs)
For the sake of editing, the last paragraph of the Results and Discussion section is split into two separate paragraphs. Additional comments about the future works are inserted before the last sentence of the last paragraph within this section. Therefore, the performance of the proposed converter is comparable to that of the fast-transient DC-DC converter.
The comparison clearly shows the improvements of the proposed boost-buck design, which offers one of the fastest transient responses with lower output voltage ripple. In this case, the zero-voltage-zero-current switching method can be developed to improve the conversion efficiency [23][24]. Salam, a family of true Zero Voltage Zero Current Switching (ZVZCS) non-isolated bidirectional DC-DC converter with wide soft switching range, IEEE Trans.
Yin, A soft-switching non-inverting buck–boost converter with efficiency and performance improvement, IEEE Trans. Paper Title: A Novel Boost-Buck Converter Architecture to Improve Transient Response and Output Voltage Ripple.
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A Novel Boost-Buck Converter Architecture for Improving Transient Response and Output-Voltage Ripple
The Boost-stage
In the proposed boost converter, the boost stage boosts the input voltage, 𝑣𝑠, to the common capacitor voltage, 𝑣𝐴. During the charging phase, the current switch 𝑆𝐴 is on, so the voltage source 𝑣𝑆 activates the boost inductor 𝐿𝐴, while the blocking phase is activated by the energy stored in the common capacitor. Meanwhile, in the transfer stage, the current switch 𝑆𝐴 is turned off and the energy stored in the boost inductor is released and becomes the output current in the boost stage 𝑖𝐴.
When the stored energy in the boost inductor is depleted, the stage falls into the resting phase. When there is no net change in the output current and voltage during a switching period, the stage reaches a steady state. 𝑆2𝑇𝑆 (4) when the phase works in CCM, only two unique phases appear: the charging phase and the transfer phase.
2𝑣𝐴2𝐿𝐴 (8) The relationship between the changes of output current ∆𝑖𝐴 and voltage ∆𝑣𝐴 can be derived as:. 9) clearly shows an opposite trend between both parameters. This essential problem means that the increase in output current causes the output voltage to decrease and vice versa. This causes a violation of the output voltage range in the buck-boost converter, because the stage supplies energy directly to the load.
Therefore, the stability of the output voltage suffers from a change in the output current when the buck boost converter works in the boost mode. Although it is possible to mitigate this problem, it will still be unavoidable in the transient phase and will produce overshoot or undershoot in the output voltage.
The Buck Stage
The stability of the output voltage in the load boost converter suffers from a change in the output current when it works in CCM in the boost stage. The detrimental effect of a change in output current is clearly illustrated by the output voltage curve at the bottom of Figure 3(a). In a buck-boost converter, an increase in the duty cycle of the boost stage results in a drop in the output voltage.
Nevertheless, as long as 𝑣𝐴 is greater than 𝑣𝑂, the output voltage can be properly held constant by the buck-trap. These phenomena ensure that the output voltage ripple of the proposed converter is lower than that of a conventional buck-boost converter. A). More time for the transfer phase increases 𝑖𝐷 and causes an upward violation of the output voltage range.
In the proposed converter, when the output current is changed, the buck stage determines the corresponding duty cycle adjustment amount according to Eq. 13) or (16) to change the buck inductor current to keep the output voltage constant at its nominal value. The proposed converter can provide a better output voltage ripple 𝑣𝑟 when drawn by a large output current and the buck stage works in CCM. The maximum value of output voltage ripple is 13.6 mV when the buck stage operates in DCM and 15 mV when operating in CCM.
However, the proposed boost converter provides better output voltage quality due to its lower output voltage ripple. Thus, the proposed boost converter is suitable for practical applications, featuring extremely fast transient response and low output voltage ripple.
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Jenny Marcela Sánchez-Torres (Computing Systems and Industrial Engineering Dept., Universidad Nacional de Colombia, Bogotá, Colombia). Field of study: Computer science: General computer science Decision science: Information systems and management engineering: Electrical and electronic engineering. CiteScore counts the citations received in - to articles, reviews, conference papers, book chapters and data papers published in - and divides this by the number of publications published in.
Journal of ICT Research and Applications
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