Performance Comparison of the Efficiency and Power Density among Multilevel Converter Topologies for a PV Inverter by the Pareto-Front Curve

Kashihara, Yugo; Itoh, Jun‐ichi

doi:10.1541/ieejias.134.209

“…Volume of a cooler for semiconductor elements is calculated using CSPI (Cooling System Performance Index). 13,14 CSPI is the inverse of thermal resistance per unit volume; the greater is the index, the higher is heat dissipation capacity. CSPI for natural cooling is about 3, and this value was assumed when calculating cooler volume.…”

Section: Converter Volumementioning

confidence: 99%

Development of multi‐port converter with square‐wave‐voltage multilevel converter and active power filter connected in series

Watanabe

¹

,

Miyasita

²

,

Itoh

³

et al. 2022

Electrical Engineering Japan

0

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This paper proposes a multi‐port DC‐AC converter with high efficiency and high‐power density. The proposed circuit consists of a full bridge converter, a series active filter, and an unfolder circuit. The proposed circuit reduces the low switching losses owing to the square waveform operation with low switching frequency. In addition, the proposed converter improves the power density because the number of inductors is significantly reduced compared to the conventional multi‐port converter. As the experimental result, the maximum efficiency of the proposed circuit reached 99.3%. Finally, the power density of the proposed converter is evaluated by the Pareto front curve. As the result, the power density of the proposed circuit was increased by 1.6 times in comparison with the conventional circuit.

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“…15 Figure 7 is a schematic of Proposed Circuit 2. We can postulate that multistaging leads to a volume reduction of about 60% because the volume of the capacitor is proportional to the stored energy.…”

Section: Proposed Circuit 1 (Aim: Flicker Reduction)mentioning

confidence: 99%

“…We can postulate that multistaging leads to a volume reduction of about 60% because the volume of the capacitor is proportional to the stored energy. 15 Figure 7 is a schematic of Proposed Circuit 2. The operations of the current bypass circuit and the like are the same as described for Proposed Circuit 1.…”

Section: Proposed Circuit 1 (Aim: Flicker Reduction)mentioning

confidence: 99%

Experimental Verification of a Linear AC LED Driver with a Light Flicker Compensating Circuit and High Power Factor Operation by Modulating the Current Regulator

Noge

¹

2019

IEEJ Trans. IA

1

0

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This article proposes a linear PFC regulator with a light flicker compensating circuit for LED lighting applications. The proposed circuit is small in size because it includes no reactors or electrolytic capacitors. The light flicker compensating circuit, which is connected in parallel to the LED string, consists of four ceramic capacitors and diodes. These capacitors are operated in series in the charge state and in parallel in the discharge state by using a diode network circuit. Therefore, an external controller and large capacitors are not required. The proposed circuit is experimentally validated using a 9 W prototype. From the experimental results, it is found that the power fluctuation of the LED string is less than the JIS and JLMA limitations, and the power factor is 0.95. In addition, the power loss is analyzed at an efficiency of 89.4% for the prototype circuit. Also, by modulating the current regulator, sinusoidal input current can be achieved. The second proposed circuit is experimentally validated using a 7.5 W prototype, and the power factor and input current distortion are found to be 0.999 and 2.1%, respectively. K E Y W O R D S LED lighting, light flicker, linear circuit, power factor correction Electr Eng Jpn. 2019;209:35-44.

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“…Therefore, the energy stored in the capacitor when increasing from a two‐series configuration to a four‐series configuration can be reduced 60.3%. We can postulate that multistaging leads to a volume reduction of about 60% because the volume of the capacitor is proportional to the stored energy …”

Section: Proposed Circuitmentioning

confidence: 99%

Experimental verification of a linear AC LED driver with a light flicker compensating circuit and high power factor operation by modulating the current regulator

Noge

¹

2019

Electrical Engineering Japan

1

0

View full text Add to dashboard Cite

This article proposes a linear PFC regulator with a light flicker compensating circuit for LED lighting applications. The proposed circuit is small in size because it includes no reactors or electrolytic capacitors. The light flicker compensating circuit, which is connected in parallel to the LED string, consists of four ceramic capacitors and diodes. These capacitors are operated in series in the charge state and in parallel in the discharge state by using a diode network circuit. Therefore, an external controller and large capacitors are not required. The proposed circuit is experimentally validated using a 9 W prototype. From the experimental results, it is found that the power fluctuation of the LED string is less than the JIS and JLMA limitations, and the power factor is 0.95. In addition, the power loss is analyzed at an efficiency of 89.4% for the prototype circuit. Also, by modulating the current regulator, sinusoidal input current can be achieved. The second proposed circuit is experimentally validated using a 7.5 W prototype, and the power factor and input current distortion are found to be 0.999 and 2.1%, respectively.

show abstract

Performance Comparison of the Efficiency and Power Density among Multilevel Converter Topologies for a PV Inverter by the Pareto-Front Curve

Cited by 7 publications

References 0 publications

Development of multi‐port converter with square‐wave‐voltage multilevel converter and active power filter connected in series

Development of multi‐port converter with square‐wave‐voltage multilevel converter and active power filter connected in series

Experimental Verification of a Linear AC LED Driver with a Light Flicker Compensating Circuit and High Power Factor Operation by Modulating the Current Regulator

Experimental verification of a linear AC LED driver with a light flicker compensating circuit and high power factor operation by modulating the current regulator

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