Boost Converter with a Transformer Capacitor Cell for Implementing Features of Zero-voltage Switching/Zero-current Switching and Double-output Sources

In this paper, we present on-chip frequency compensation with a capacitor multiplier for a current-mode control DC-DC converter. The capacitor multiplier technique can effectively remove the crossover frequency from the origin. An equivalent capacitance is obtained by amplifying the small current in the capacitor. The value of the equivalent capacitor can be adjusted. The functional block diagram and small-signal transfer function of a buck DC-DC converter are derived for a simplified system loop for on-chip frequency compensation with a capacitor multiplier. In this paper, the derived system transfer function for frequency compensation is verified by simulation and from test results. The proposed circuit is suitable for low-cost and small-size applications. Simulation results and experimental results are presented to demonstrate the theoretical analysis.

“…G m , R EA , gEA, OTA, and AC IN constitute the voltage loop. (12) The invariant relations in the DC terminal quantities are given by ( ), 0 ( ) 0,…”

Section: Small-signal Modelmentioning

confidence: 99%

Frequency Compensation with Capacitor Multiplier in DC–DC Converter

Liu¹,

Chen²,

Wang³

2022

“…(1)(2)(3)(4)(5)(6) To overcome the above disadvantages, zeta converters with soft-switching techniques to reduce power losses and EMI noise have been proposed. (7)(8)(9)(10)(11)(12) The soft-switching techniques can be divided into four techniques: zero-voltage switching (ZVS), zero-current switching (ZCS), zero-voltage transition (ZVT), and zero-current transition (ZCT). Among the four techniques, the ZVT technique has the simplest structure and easiest implementation for applications of low-or medium-power converters.…”

Section: Introductionmentioning

confidence: 99%

Zeta Converter with Resistor-capacitor-diode Snubber and H-type Snubber to Reduce Switching and Reverse-recovery Losses

Tsai¹,

Chen²

2021

Self Cite

In this paper, a zeta converter with a resistor-capacitor-diode (RCD) snubber and an H-type snubber to reduce switching and reverse-recovery losses is proposed. The proposed converter has the following advantages: (1) By incorporating an RCD snubber, the power switch can achieve a zero-voltage transition (ZVT) to reduce the switching losses of the power switch. (2) By incorporating an H-type snubber, the reverse-recovery losses of the power diode can be reduced. Therefore, the overall efficiency of the proposed converter is increased significantly. Finally, a prototype zeta converter with an RCD and an H-type snubber to reduce the switching losses of the power switch and the reverse-recovery losses of the power diode is built. Experimental results verify that the proposed zeta converter is relatively suitable for the requirements of a low or medium power.

“…(7)(8)(9)(10) These disadvantages lead to low transfer efficiency and serious electromagnetic interference (EMI) of the boost converter. (11)(12)(13)(14) To overcome these disadvantages, a converter with an inductor-capacitor-diode (LCD) snubber that was first reported in 2009 is shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

Comparison between Two Different Snubbers of a Boost Converter for Achieving Soft-switching Features

Tsai¹,

Huang²,

Liang³

2021

Self Cite

This paper presents a comparison between two different snubbers of a boost converter for achieving soft-switching features. To obtain high current capability and high conversion efficiency, a boost converter is operated in a hard-switching mode, which will induce high component stresses, high switching losses of active switches, and serious electromagnetic interference (EMI). To overcome these disadvantages, two different snubbers using simple passive components that are incorporated in boost converters are compared. The two different snubbers are a buck snubber and a boost snubber. In this study, the performance and efficiency of boost converters with the buck snubber and with the boost snubber are obtained. From the characteristic analyses and experimental results, it has been verified that the boost converter with the boost snubber achieved lower component stresses, lower switching losses of active switches and higher conversion efficiency than the boost converter with the buck snubber.