Novel switching power converters using electric double-layer capacitors (EDLCs) as power backup are presented in this paper. The configurations of these circuits are very simple and the number of components in each converter is very small. The unbalance of voltages in EDLCs, that has been one of the main problems of the conventional circuit, does not occur in the new design. A prototype circuit has been built and tested. As a result, good backup performance has been obtained: the backup time when the input voltage source is disconnected is 11.7 sec for an output of 5.0 V and 2.0 A. The efficiency of the new circuit in steady-state operation is 90% for an output voltage of 5.0 V and an output current range of 2.0-4.0 A.

https://ieeexplore.ieee.org/iel3/5207/14087/00646058.pdf

Switching converters using double-layer capacitors as power backup

EDLCs offer high energy density and long life span, so various applications may be anticipated in the realm of energy storage devices, such as those used in electric vehicles or electric power stabilization in power systems, etc. However, since the voltage limit is low of the devices, it is necessary to connect them in series or parallel. In addition, it is required that they be used in the region of their critical voltage limit or capacity limit. In order to apply them efficiently, the devices should be used with balanced voltage. In this paper, some novel voltage balancers are presented, employing a CW (Cockcroft-Walton) circuit as a basic construction. Characteristics of proposed circuits are analyzed and improved especially about circuit construction strategies.

http://ieeexplore.ieee.org/iel7/6857936/6869559/06869578.pdf

Discussions on various voltage equalizers for EDLCs using CW circuit

Various secondary batteries including EDLCs are widely used in various electric vehicles, etc. Among them, EDLCs offer high energy density and long life span, so various applications may be anticipated in the realm of those energy storage devices . However, since the voltage limit is low of the devices, it is necessary to connect them in series or parallel. In addition, it is required that they be used in the region of their critical voltage limit or capacity limit. In order to apply them efficiently, the devices should be used with balanced voltage. In this paper, some novel voltage balancer s are presented, employing a CW (Cockcroft-Walton) circuit as a basic construction . Characteristics of proposed circui ts are analyzed and improved especially about circuit construction strategies.

/pdf/novel-voltage-equalizers-for-secondary-batteries-including-53rupi4lg6.pdf

Novel Voltage Equalizers for Secondary Batteries including EDLCs using CW circuit

Supercapacitors offer high energy density and long life span, so various applications may be anticipated in the realm of energy storage devices, such as those used in electric vehicles or electric power stabilization in power systems, etc. However, since the voltage limit is low of the devices, it is necessary to connect them in series or parallel. In addition, it is required that they be used in the region of their critical voltage limit or capacity limit. In order to apply them efficiently, the devices should be used with balanced voltage. In this paper, a novel voltage balancer is presented, employing a CW (Cockcroft-Walton) circuit. Characteristics of proposed circuit are analyzed and improved especially about charging response.

Proposal and improvements of voltage equalizers for EDLCs

The fundamental characteristics of the wireless rapid charger of super capacitor is investigated by experiments and simulation. This system is composed of the resonant half bridge inverter and the noncontact transformer. Based on the results, the frequency control method that can do the wireless rapid charge regardless of the relative position of the windings of the noncontact transformer is proposed. It can meet the resonance requirement and large charging current can be acquired by detecting the current of the primary switch and controlling the frequency of the inverter. Streszczenie. Badano eksperymentalnie i podczas symulacji numerycznych charakterystyki bezprzewodowego systemu szybkiego ladowania superkondensatora. System sklada sie z mostkowego przeksztaltnika rezonansowego i bezstykowego transformatora. Na podstawie wynikow zaproponowano nową czestotliwościową metode sterowania ladowarką, niezaleznie od wzajemnej pozycji uzwojen bezstykowego transformatora. Metoda zapewnia wysoki prąd ladowania dzieki detekcji prądu przelącznika pierwotnego oraz kontroli czestotliwości przeksztaltnika. (Bezprzewodowy system szybkiej ladowarki superkondensatora)

Wireless Rapid Charger of Super Capacitor

The characteristics of electric doubie-layer capacitors (EDLCs) controlled by switching converters are in& clear. The maximum operating time, the energy availability versus the average output power of the system are analyzed. The selection policies of the series and/or parallel combination of EDLCs and the type of switching converter, that is, buck, boost and buck-boost, are discussed. As a result, the inforination to make a practical design easy has been obtained.

E. Sakai

Papers

Switching converters using double-layer capacitors as power backup

On the Combination of Double-Layer Capacitors and Switching Converters