Interoperability specifications of common external power supply (EPS) for use with data-enabled mobile telephones

This paper focuses on analyzing the problem that occurs when running a stand-alone super capacitor charging system, which is capable of working independently without relying on any external power supply. Components are easily damaged due to overloading. This occurs at the moment when the stand-alone super capacitor charging system switches on. To solve the problem, this paper not only finds the reason why the inductor current of the boost converter saturates at the switching moment, but also analyzes the waveforms of the inductor current at the switching moment. Finally, the verification of the circuit characteristics with an external stimulation was carried out with both experiments and simulation.

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J232024 Energy Efficiency of Electrical Powered Prosthetic Hand without External Power Supply

The Proceedings of Mechanical Engineering Congress Japan ◽

10.1299/jsmemecj.2013._j232024-1 ◽

2013 ◽

Vol 2013 (0) ◽

pp. _J232024-1-_J232024-5 ◽

Cited By ~ 1

Author(s):

Yoshio INOUE ◽

Kyoko SHIBATA ◽

Tetsuya ICIHARA ◽

Akihiro YAMOMOTO ◽

Shigenobu AKAHATA

Keyword(s):

Energy Efficiency ◽

Power Supply ◽

Prosthetic Hand ◽

External Power ◽

External Power Supply

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A new light-activated CMOS retinal-pulse generation circuit without external power supply for artificial retinal prostheses

ICECS 2001. 8th IEEE International Conference on Electronics, Circuits and Systems (Cat. No.01EX483) ◽

10.1109/icecs.2001.957552 ◽

2002 ◽

Author(s):

Chung-Yu Wu ◽

Li-Ju Lin ◽

Kuan-Hsun Huang

Keyword(s):

Power Supply ◽

Pulse Generation ◽

Retinal Prostheses ◽

External Power ◽

External Power Supply

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Accounting power supply schemes for traction substations in the calculation of short circuits in the AC traction network

Vestnik of the Railway Research Institute ◽

10.21780/2223-9731-2019-78-1-10-18 ◽

2019 ◽

Vol 78 (1) ◽

pp. 10-18 ◽

Cited By ~ 3

Author(s):

Yu. I. Zharkov ◽

N. A. Popova ◽

E. P. Figurnov

Keyword(s):

High Voltage ◽

Power Supply ◽

Power Supply System ◽

Short Circuit ◽

Supply System ◽

Power Sources ◽

Traction Network ◽

Traction Substations ◽

External Power ◽

External Power Supply

When calculating short-circuit currents in the AC traction network, it is assumed that each of the traction substations receives power from uncoupled external power supply sources with known resistances. In some cases, especially when powering a group of traction substations from a high-voltage power line of a longitudinal power supply, the external power supply system affects not only the magnitude of short-circuit currents, but also their redistribution between adjacent traction substations of the interstation area where this circuit is considered. Such unrecorded redistribution can have a negative effect on short circuit protection. The article considers the equivalent circuit of the traction network, taking into account resistance of the external power supply system. Particular attention is paid to the fact that in replacement circuits of direct and negative sequence value of reduced resistance of one phase of a multiwinding transformer, calculated from the short circuit voltage, does not depend on the connection scheme of its windings. It is noted that in some cases it is difficult to obtain a complete scheme of an external power supply system. Considering that the short circuit in the traction network for the external power supply system is remote, it is proposed taking into account the reference network or traction substations as power sources, from which high-voltage transmission lines power the traction substations. Resistance of the supporting substations as power sources must takes into account connected equivalent power system.Such equivalenting should be carried out by known values of currents or short-circuit powers at the inputs of the reference substation or, if such information is not available, by the rated values of the switched-off currents or powers of the switches of high-voltage line connections.The following power schemes for traction substations are considered: each from its own supporting substation, which is part of an electrically uncoupled external power supply system; from the double-circuit high-voltage line of longitudinal power supply when it is powered from different supporting substations; from the supporting network substation, the traction substation receives power from two lines, and from this the traction substations receive power from two lines in a circle pattern.These three common cases cover all the most common power schemes for traction substations. For each of them formulas are given to determine the resulting equivalent resistance of the external power supply circuit, which should be taken into account in the replacement circuit of the traction network.

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