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Variations of the doubler of electricity

Physics Education 2019年第3期54卷 035019-035019页

作者： De Queiroz, Antonio C.M. COPPE/EP Electrical Engineering Program Federal University of Rio de Janeiro CP 68504 Rio de Janeiro 21941-972 Brazil

The 'doubler of electricity' is an old static electricity generator, the first using only electrostatic induction and not friction, proposed by Bennet (1787 Phil. Trans. 77 288-96) as a system to amplify small electric charges in order to make them observable in an electroscope. This paper studies the operation of the doubler, and shows that a class of devices working in similar way can be obtained as variations of it and as symmetrical versions. Several new 'doublers' are then described and discussed, including some that multiply by a factor greater than two per cycle. © 2019 IOP Publishing Ltd.

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Live demonstration: Unipolar symmetrical variable-capacitance generators for energy harvesting 50

Live demonstration: Unipolar symmetrical variable-capacitanc...

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50th IEEE International Symposium on Circuits and Systems, ISCAS 2017

作者： De Queiroz, Antonio Carlos M. De Oliveira Filho, Luiz Carlos Macedo COPPE/EP - Electrical Engineering Program Federal University of Rio de Janeiro Rio de Janeiro Brazil EP-Department of Electronic and Computer Engineering Federal University of Rio de Janeiro Rio de Janeiro Brazil

ISBN: (纸本)9781467368520

This demonstration shows a variable-capacitance electrostatic generator made with 3D-printing techniques powering loads through a DC/DC converter. The generator is similar in structure to a microelectromechanical device, and forms an unstable electrostatic generator when connected to a 2-phase diode-capacitor voltage multiplier. As load, a simple bidirectional digital wireless communication system is used. © 2017 IEEE.

关键词： Energy harvesting

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Biased capacitive divider electrostatic generators for energy harvesting

Biased capacitive divider electrostatic generators for energ...

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IEEE Latin American Symposium on Circuits and Systems (LASCAS)

作者： Antonio Carlos M. de Queiroz COPPE/EP-Electrical Engineering Program Federal University of Rio de Janeiro Rio de Janeiro Brazil

ISBN: (纸本)9781509058600

A study is presented about some structures of electrical generators based on variable capacitors, suitable for energy harvesting applications, and compatible with construction as microelectromechanical systems. In the discussed structures, part of the generator has as function the generation of a high biasing voltage, and another part, a capacitive divider where one of the capacitors is variable, is used as the actual generator. It feeds a DC/DC converter that generates the useful output energy at low voltage. The structures add flexibility in the design over previously proposed generators based on Bennet's doubler, and allow greater output power.

关键词： Generators Capacitors Capacitance Power generation Discharges (electric) Electrostatics Micromechanical devices

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Unipolar symmetrical variable-capacitance generators for energy harvesting 60

Unipolar symmetrical variable-capacitance generators for ene...

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60th IEEE International Midwest Symposium on Circuits and Systems, MWSCAS 2017

ISBN: (纸本)9781509063895

This paper investigates a class of electrical generators based on capacitors and diodes, with two capacitors being variable. Their main characteristics are a symmetrical structure and that they produce two outputs with the same polarity. The simplest version is analyzed in more detail, although in an approximate way, and generalizations of it are obtained, identified with a particular form of two-phase voltage multiplier. The generalized versions require less capacitance variation for operation, and are shown, by simulation, to have faster startup than structures with a single variable capacitor. The structures are tested experimentally with a 3D-printed pair of variable capacitors that tries to emulate a structure built with microelectromechanics techniques. © 2017 IEEE.

关键词： Energy harvesting

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Energy harvesting with 3D-printed electrostatic generators 7

Energy harvesting with 3D-printed electrostatic generators

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7th IEEE Latin American Symposium on Circuits and Systems, LASCAS 2016

ISBN: (纸本)9781467378352

An investigation is made about the practicability of building electrostatic generators suitable for energy harvesting applications using 3D-printed electromechanical structures. The generators are based on variable capacitors, using structures similar to Bennet's doubler, or more complex charge multipliers. Normal ABS plastic is used for insulating and mechanical structures, and conductive ABS is used for conducting parts as capacitor plates. As these generators work at very high impedance levels, the relatively high resistivity of the material used as conductor has acceptably small effect, and the technique can be used as an inexpensive alternative for experimenting with generator structures. © 2016 IEEE.

关键词： Electrostatics

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Energy harvesting using symmetrical electrostatic generators

Energy harvesting using symmetrical electrostatic generators

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International Symposium on Circuits and Systems

作者： Antonio Carlos M. de Queiroz COPPE/EP - Electrical Engineering Program Federal University of Rio de Janeiro Rio de Janeiro Brazil

ISBN: (纸本)9781479953424

This paper describes possible regenerative electrostatic generators that can be obtained when two variable capacitors are used, in a symmetrical configuration. The studied structures require also two load capacitors and four switches or diodes, and produce two opposite output voltages. It is shown that some versions can produce a voltage multiplication factor per cycle that can reach 2. 618, greater than the maximum of 2 of the previously studied devices based on Bennet's doubler. As those, the proposed structures are also compatible with microelectromechanical systems, and may be suitable for energy harvesting applications.

关键词： low-power circuits energy harvesting electrostatic generator

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Energy harvesting with 3D-printed electrostatic generators

Energy harvesting with 3D-printed electrostatic generators

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IEEE Latin American Symposium on Circuits and Systems (LASCAS)

作者： Antonio Carlos M. de Queiroz Luiz Carlos Macedo de Oliveira Filho COPPE/EP - Electrical Engineering Program Federal University of Rio de Janeiro Rio de Janeiro Brazil EP-Department of Electronic and Computer Engineering Federal University of Rio de Janeiro Rio de Janeiro Brazil

关键词： Generators Capacitors Capacitance Discharges (electric) Electrostatics Plastics Power generation

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Simulation of MEMS energy harvesting generators based on Bennet's doubler 6

Simulation of MEMS energy harvesting generators based on Ben...

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6th IEEE Latin American Symposium on Circuits and Systems, LASCAS 2015

作者： De Queiroz, Antonio Carlos M. De Oliveira Filho, Luiz Carlos Macedo COPPE/EP Electrical Engineering Program Federal University of Rio de Janeiro Rio de Janeiro Brazil EP-Department of Electronic and Computer Engineering Federal University of Rio de Janeiro Rio de Janeiro Brazil

ISBN: (纸本)9781479983322

This paper presents considerations about the design and operation of electrostatic generators based on Bennet's doubler, when realized with microelectromechanics techniques. electrical models taken from mechanical analogs are used to simulate the devices in operation, with the effects of the mechanical operations and interactions with electrical forces taken into account in the models. From the simulated results, guidelines for the design of the actual systems can be obtained. © 2015 IEEE.

关键词： Electrostatics

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Analysis of the Operation of a Regenerative Electrostatic Energy Harvester

Analysis of the Operation of a Regenerative Electrostatic En...

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IEEE International Symposium on Circuits and Systems

作者： Antonio Carlos M. de Queiroz COPPE/EP - Electrical Engineering Program Federal University of Rio de Janeiro Rio de Janeiro Brazil

ISBN: (纸本)9781479983926

The operation of an electrostatic energy harvester based on the electrostatic generator known as "Bennet's doubler," is analyzed in detail, with the objective of finding the relations of the capacitance values, frequency of operation, and other parameters, with the resulting waveforms and the harvested power when the device is used in conjunction with a DC/DC converter. The results are compared with simulations, and are verified with a macroscopic physical prototype with parameters similar to a microelectromechanical version.

关键词： energy harvesting electrostatic generator low-power circuits

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Simulation of MEMS energy harvesting generators based on Bennet's doubler

Simulation of MEMS energy harvesting generators based on Ben...

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IEEE Latin American Symposium on Circuits and Systems (LASCAS)

作者： Antonio Carlos M. de Queiroz Luiz Carlos Macedo De Oliveira Filho COPPE/EP - Electrical Engineering Program Federal University of Rio de Janeiro Rio de Janeiro RJ BR Federal University of Rio de Janeiro Rio de Janeiro RJ BR

关键词： Capacitance Force Micromechanical devices Capacitors Generators Springs Electrostatics

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