Switched-capacitor DC-DC converters

Kuwabara, Kouhei; Hiyachika, E.

doi:10.1109/intlec.1988.22352

Cited by 32 publications

(11 citation statements)

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“…Converter D5 in [15] presents a much smaller dc gain and larger voltage stress on switches. The capacitor size of the proposed converter can be smaller compared with the converters in [16] and [17], meaning that the proposed converter has a better power density. …”

Section: DC Analysis Of the Proposed Large Dc Gain Convertermentioning

confidence: 99%

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High step-up, high power density boost converter integrated with switched capacitor-diode cell

Ya-fei

Ioinovici

2015

2015 9th International Conference on Power Electronics and ECCE Asia (ICPE-ECCE Asia)

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A large dc conversion ratio non-isolated hybrid converter is obtained by integrating a capacitor-diode cell into a boost circuit. A larger conversion ratio comparing with the conventional boost converter is obtained. And the cost for this larger dc gain is just one additional cell formed by a diode and a capacitor. The new structure presents a minimum of components, positioned in such a way as to decrease the size of the capacitors. A high power density is obtained due to the use of smaller size capacitors. The single active switch is placed with the source referenced to the ground, rendering simplicity in its driving. The theory, simulation and experimental results showed a reduced voltage stress on the switches and a high efficiency.Index Terms-large dc conversion ratio, capacitor-diode cell, high power density, reduced voltage stress I. INTRODUCTIONAlternative sources of energy like solar and wind power can help solving the problems of air pollution caused by gas-driven automobiles and fossil fuels. The demand for clean sources of energy is urgent in all the world, and particularly in fast-developing countries like China and India. Moreover, fossil fuels on earth are going to be depleted in the near future, humans need to find a good way to make the alternative sources of energy more widely used. Photovoltaic panels and fuel cells attract more and more attention in today's use of alternative sources of energy. However, the instability of the low voltage generated by solar or fuel cells requires them to be followed by converters with a large step-up dc gain in order to become useful front-end sources of energy.The basic boost converter would have to operate with an extremely large duty cycle to fulfill such a requirement. The implication would be a very large voltage stress on the MOSFET and output diode, which would attract a drastic decrease of the overall efficiency [1]. And an extreme duty cycle gives little room for adjusting the bandwidth of the PWM controller.

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Section: DC Analysis Of the Proposed Large Dc Gain Convertermentioning

confidence: 99%

“…Converter in [16], [17] V. EXPERIMENTAL RESULTS The prototype was built by using MOSFET IRF540N, Schottky diodes VFT1045, C 1 = C 2 = 47 F, and L = 100 H. The 50 W prototype was built in the lab, shown in Fig. 6.…”

Section: DC Analysis Of the Proposed Large Dc Gain Convertermentioning

confidence: 99%

High step-up, high power density boost converter integrated with switched capacitor-diode cell

Ya-fei

Ioinovici

2015

2015 9th International Conference on Power Electronics and ECCE Asia (ICPE-ECCE Asia)

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“…Furthermore, NIHDCs find wide application even in portable electronic power conversion point of load applications that use a battery as the primary power source. High step-up converters are also widely used in interfacing the micro-sources to a 42 or 48 V dc-grid [1][2][3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Third‐order boost converter

Veerachary

2018

IET Power Electronics

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A third-order boost point of load converter capable of giving higher voltage gain, identical/similar to fifth-order converters, is proposed. In view of the lower order and higher boosting feature, the converter is more suitable to interface the given low voltage source to a high-voltage dc point of load or to a dc-bus. Furthermore, the proposed converter dynamics is simpler as its control-to-output transfer function is free from right half s-plane zeros. Component design expressions are formulated through a steady-state analysis. The boosting factor of the proposed converter is higher than the traditional boost and other reported fourth-order boost converters. The transfer functions are formulated from the state-space model and then a digital controller is designed in the z-domain. The proposed converter features are demonstrated through analysis and then compared with sample experimental observations.

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“…In 1988, many new types of SCC were proposed such as voltage divider/multiplier or inverter [1,2]. Unlike conventional converters, the inductorless SCC has a light weight and a small volume.…”

Section: Introductionmentioning

confidence: 99%

“…In 1971, Brugler suggested an SC voltage multiplier, and then Lin and Chua presented the relevant topological analysis in 1977. In 1988, many new types of SCC were proposed such as voltage divider/multiplier or inverter [1,2]. Up to now, some well-known SC topologies [3,4] are listed as (i) Dickson, (ii) Ioinovici, (iii) Ueno, and (iv) Makowski charge pump or SCC.…”

Section: Introductionmentioning

confidence: 99%

A switch‐utilization‐improved switched‐inductor switched‐capacitor converter with adapting stage number

Chang

Chen

2015

Circuit Theory & Apps

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A novel closed-loop switched-inductor switched-capacitor converter (SISCC) is proposed by using the pulse-width-modulation (PWM) compensation for the step-up DC-DC conversion/regulation, and together by combining the adaptive-stage-number (ASN), control for the higher switch utilization and wider supply voltage range. The power part of SISCC is composed of two cascaded sub-circuits, including (i) a serialparallel switched-capacitor circuit with n c pumping capacitors and (ii) a switched-inductor booster with m c resonant capacitors, so as to obtain the high step-up gain of (n c + 1) × m c /(1 À D) at most, where D is the duty cycle of PWM adopted to enhance output regulation as well as robustness to source/loading variation. Besides, the ASN control is presented with adapting the stage number n (n = 0, 1, 2, …, n c ) of pumping capacitors to obtain a flexible gain of (n + 1) × m c /(1 À D), and further in order to make the SISCC operating at a properly small duty cycle for improving switch utilization and/or supply voltage range. Some theoretical analysis and control design include formulation, steady-state analysis, ASN-based conversion ratio, efficiency, output ripple, stability, inductance and capacitance selection, and control design. Finally, the performance of this scheme is verified experimentally on an ASN-based SISCC prototype, and all results are illustrated to show the efficacy of this scheme. R L; (8) where k = V d /V S is the ratio of V d to V S . When V S = 5V and V d = 0.2V, the ratio is k = V d /V S = 0.04. For example, k = 0.04, x = 0.2, and R L ≫ r T , r C (R L is in Ω-level, and r T , r C is in mΩ-level, that is, R L ≫ R o ), 716

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Switched-capacitor DC-DC converters

Cited by 32 publications

References 0 publications

High step-up, high power density boost converter integrated with switched capacitor-diode cell

High step-up, high power density boost converter integrated with switched capacitor-diode cell

Third‐order boost converter

A switch‐utilization‐improved switched‐inductor switched‐capacitor converter with adapting stage number

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