Two Q-ZSCs with Efficient Buck-Boost Gain

Ado, Muhammad; Jusoh, Awang; Mutawakkil, Abdulhamid Usman; Ayob, Shahrin Md.

doi:10.1109/appeec.2018.8566519

Cited by 7 publications

(13 citation statements)

References 10 publications

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“…The small signal equations of the states ṽ c1 (s) and ṽ c2 (s) as shown in (53) and (54) are not identical, likewise ĩL 1 (s) and ĩL 2 (s) as shown in (55) and (56) are also non identical. An explanation to this non-identicality is due to the asymmetry of this topology.…”

Section: Small Signal Analysismentioning

confidence: 99%

“…The small signal models presented in (53) to (56) were used to obtain the transfer functions (G input statẽ )…”

Section: Transfer Functionsmentioning

confidence: 99%

“…This is mainly due to the fact highlighted by [15] that majority of the literature on ISCs focuses on the inverter mode of operation although [52] worked on PWM DC-DC converter. DC-DC ZSC/q-ZSCs are not very popular due to common deficiencies like lack of buck-boost capability at the efficient duty ratio range of [0.35 to 0.65] [53], discontinuous gain curve and higher components count as compared with the traditional buck-boost converter (BBC).…”

Section: Introductionmentioning

confidence: 99%

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Dynamic model of A DC-DC quasi-Z-source converter (q-ZSC)

Ado¹,

Jusoh²,

Mutawakkil³

et al. 2019

IJECE

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Two quasi-Z-source DC-DC converters (q-ZSCs) with buck-boost converter gain were recently proposed. The converters have advantages of continuous gain curve, higher gain magnitude and buck-boost operation at efficient duty ratio range when compared with existing q-ZSCs. Accurate dynamic models of these converters are needed for global and detailed overview by understanding their operation limits and effects of components sizes. A dynamic model of one of these converters is proposed here by first deriving the gain equation, state equations and state space model. A generalized small signal model was also derived before localizing it to this topology. The transfer functions (TF) were all derived, the poles and zeros analyzed with the boundaries for stable operations presented and discussed. Some of the findings include existence of right-hand plane (RHP) zero in the duty ratio to output capacitor voltage TF. This is common to the Z-source and quasi-Z-source topologies and implies control limitations. Parasitic resistances of the capacitors and inductors affect the nature and positions of the poles and zeros. It was also found and verified that rather than symmetric components, use of carefully selected smaller asymmetric components L1 and C1 produces less parasitic voltage drop, higher output voltage and current under the same conditions, thus better efficiency and performance at reduced cost, size and weight.

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Section: Small Signal Analysismentioning

confidence: 99%

“…The small signal models presented in (53) to (56) were used to obtain the transfer functions (G input statẽ )…”

Section: Transfer Functionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dynamic model of A DC-DC quasi-Z-source converter (q-ZSC)

Ado¹,

Jusoh²,

Mutawakkil³

et al. 2019

IJECE

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“…(b) It has buck-boost capability at the efficient duty ratio range. This is against the boost only or buck only capability of the other two classes [37]. (c) When compared with the ZSCs and qZSCs with single gain [14], it has higher gain magnitude at boost mode [11].…”

Section: Introductionmentioning

confidence: 97%

“…(c) When compared with the ZSCs and qZSCs with single gain [14], it has higher gain magnitude at boost mode [11]. Although the q-ZSCs with discontinuous gain have higher gain magnitude during boost mode than the BBC, their discontinuous gain, buck mode limitation, lack of buck-boost capability at efficient duty ratio range (0.35 to 0.65) and abrupt change in polarity are disadvantages [16,[37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Asymmetric quasi impedance source buck-boost converter

Ado

Jusoh

Sutikno

2020

IJECE

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An impedance source buck-boost converter (BBC) prototype for renewable energy (RE) application in the transportation industry is proposed. Its functions include stabilizing the variable output voltage of the RE sources such as fuel cells and photovoltaic cells. The converter utilized a topology of DC-DC quasi-impedance source converters (q-ZSCs) to achieve the gain curve of the BBC. With BBC gain curve, the converter earned advantages over the two other classes of non-isolated DC-DC q-ZSCs. These advantages include ecient buck-boost capability at the ecient duty ratio range of 0:35-0:65 and continuous and non-zero gain at the ecient duty ratio range. The converter's q-ZSC topology implies using two capacitors and two inductors. These two capacitors and inductors formed two separate LC filters that provides second order filtering compared to the first order filtering in BBC. Its other advantages over the traditional BBC include elim-ination of dead and overlap-time, simple contol and permitting higher switching frequency operation. The converter is capable of utilizing high switching frequency and asymmetric components to achieve BBC gain by using smaller components to reduce cost, weight and size. Its simulation response and that of a correspond-ing BBC for some given specifications were compared, presented and analyzed. An experimental scaled-down prototype was also developed to confirm its opera-tion. Analysis of the converters responses comfirmed the prototype's second order filtering as against the first order filtering in traditional BBC.

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