Control concepts for dielectric elastomer actuators

Maas, Jügen; Gräf, Christian; Eitzen, Lars

doi:10.1117/12.879938

Cited by 7 publications

(9 citation statements)

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“…Furthermore it should be noted that controlling the upper semiconductor switches of the full-bridge circuits requires more complex, floating driver circuitry. From a circuit point of view, the only difference between the Isolated Bidirectional Full-Bridge converter (IBFBC) 4,11,17 , shown in Figure 4a), and the DAB converter 18 , depicted in Figure 4b), is the position of the inductance L dSk or L DABk . Each converter module consists of one primary full-bridge circuit comprising the semiconductor switches S 1k …S 4k and antiparallel diodes D 1k …D 4k and one secondary full-bridge circuit including the switches S 5k …S 8k and the diodes D 5k …D 8k coupled via the high frequency transformer T k .…”

Section: Full-bridge Based Converter Topologiesmentioning

confidence: 99%

“…4 As shown for an inductive load in Figure 1a), a controlled voltage source has to be used in order to control the current through the inductance, which is described by the differential equation v L = L·di L /dt. Complementary, for driving a capacitive load, exemplified in Figure 1b), a controlled current source has to be realized, which allows to control the voltage v C according to the differential equation i C = C·dv C /dt.…”

Section: Driving Capacitive Loadsmentioning

confidence: 99%

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Bidirectional power electronics for driving dielectric elastomer transducers

2012

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The operation of Dielectric Elastomer Transducers typically requires high voltages in the kilovolt range and relatively low currents. Therefore, for driving Dielectric Elastomer Transducers a high voltage power electronics is necessary. For realization of energy efficient actuator and generator applications bidirectional switched-mode converter topologies should be used enabling a bidirectional energy transfer as well as a high efficiency. In this contribution a modular converter system consisting of several switched-mode converter modules featuring galvanic isolation is presented as a basic concept for realization of a high voltage power supply. Three converter topologies -bidirectional flyback, Dual Active Bridge and Isolated Bidirectional Full-Bridge converter -are investigated and suitable modulation schemes are presented, which are based on hysteretic current-mode control, enabling a high converter dynamic and limitation of the converter output current in order to prevent electrode damage. Simulation results for the proposed converter topologies are presented and experimental results for a single bidirectional flyback converter module are shown.

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Section: Full-bridge Based Converter Topologiesmentioning

confidence: 99%

Section: Driving Capacitive Loadsmentioning

confidence: 99%

Bidirectional power electronics for driving dielectric elastomer transducers

2012

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“…One method of recovering the stored energy from a DEA is to use a DC-DC step-down converter to re-convert the high voltage energy back into its original low voltage form [3][4][5]. This low voltage energy can be returned to the supply (e.g.…”

Section: Recovering the Stored Energymentioning

confidence: 99%

Transferring electrical energy between dielectric elastomer actuators

Gisby

McKay

et al. 2012

SPIE Proceedings

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Unlike electromagnetic actuators, Dielectric Elastomer Actuators (DEAs) can exert a static holding force without consuming a significant amount of power. This is because DEAs are electrostatic actuators where the electric charges exert a Maxwell stress. A charged DEA stores its electrical energy as potential energy, in a similar way to a capacitor. To remove or reduce the Maxwell stress, the stored charge with its associated electrical energy must be removed. Current DEA driver electronics simply dispose of this stored electrical energy. If this energy can be recovered, the efficiency of DEAs would improve greatly. We present a simple and efficient way of re-using this stored energy by directly transferring the energy stored in one DEA to another. An energy transfer efficiency of approximately 85% has been achieved.

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“…Here, we consider the full bridge push-pull converter topology with cascaded high-voltage output as proposed in. 4,9 Analyzing this topology, electric losses occur mainly due to the forward resistance R DS(on) of the applied semiconductors and the series resistance R w of the wiring and inductive components, which is considered in R DS(on) . As a specific number of semiconductors is applied in the power electronics (depending on the cascades to reach the output voltage range), the resistance R PE , describing a topology equivalent resistor, is used to determine the losses of the power electronics.…”

Section: Losses Of the Power Electronics W Pementioning

confidence: 99%

Evaluation and optimization of energy harvesting cycles using dielectric elastomers

Gräf

Maas

2011

SPIE Proceedings

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Electro Active Polymers can be used as generators to convert mechanical strain energy into electrical energy. The relative energy gain basically depends on the capacity change induced by the mechanical strain, while the amount of energy gain requires a certain initial quantity of charges, which can be shown by analytical equations as well as by experimental tests. Because the harvested energy is reduced by electrical losses, an energy-optimal cycle is established under consideration of the overall system efficiency.

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Control concepts for dielectric elastomer actuators

Cited by 7 publications

References 0 publications

Bidirectional power electronics for driving dielectric elastomer transducers

Bidirectional power electronics for driving dielectric elastomer transducers

Transferring electrical energy between dielectric elastomer actuators

Evaluation and optimization of energy harvesting cycles using dielectric elastomers

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