Power electronics concepts for driving EAP actuators

Eitzen, Lars; Hoffstadt, Thorben; Maas, Jürgen

doi:10.1117/12.2009729

Cited by 7 publications

(2 citation statements)

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“…While the self-sensing concept developed is based on a power electronics with a constant switching frequency f S , different algorithms in the time domain are required for power electronics with variable switching frequencies f S , e.g. a flyback-converter driven in boundary conduction mode [23].…”

Section: Self-sensing Conceptsmentioning

confidence: 99%

Online identification algorithms for integrated dielectric electroactive polymer sensors and self-sensing concepts

Hoffstadt¹,

Griese²,

Maas³

2014

Smart Mater. Struct.

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Transducers based on dielectric electroactive polymers (DEAP) use electrostatic pressure to convert electric energy into strain energy or vice versa. Besides this, they are also designed for sensor applications in monitoring the actual stretch state on the basis of the deformation dependent capacitive-resistive behavior of the DEAP. In order to enable an efficient and proper closed loop control operation of these transducers, e.g. in positioning or energy harvesting applications, on the one hand, sensors based on DEAP material can be integrated into the transducers and evaluated externally, and on the other hand, the transducer itself can be used as a sensor, also in terms of self-sensing. For this purpose the characteristic electrical behavior of the transducer has to be evaluated in order to determine the mechanical state. Also, adequate online identification algorithms with sufficient accuracy and dynamics are required, independent from the sensor concept utilized, in order to determine the electrical DEAP parameters in real time. Therefore, in this contribution, algorithms are developed in the frequency domain for identifications of the capacitance as well as the electrode and polymer resistance of a DEAP, which are validated by measurements. These algorithms are designed for self-sensing applications, especially if the power electronics utilized is operated at a constant switching frequency, and parasitic harmonic oscillations are induced besides the desired DC value. These oscillations can be used for the online identification, so an additional superimposed excitation is no longer necessary. For this purpose a dual active bridge (DAB) is introduced to drive the DEAP transducer. The capabilities of the real-time identification algorithm in combination with the DAB are presented in detail and discussed, finally.

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Section: Self-sensing Conceptsmentioning

confidence: 99%

Online identification algorithms for integrated dielectric electroactive polymer sensors and self-sensing concepts

Hoffstadt¹,

Griese²,

Maas³

2014

Smart Mater. Struct.

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“…High voltage switch-mode power supplies for charging the capacitive loads are implemented in [10]- [12]. Bidirectional dc-dc power converters are needed for the DEAP based capacitive actuators [13], to increase the lifetime of the battery, also to discharge the high voltage across them. Bidirectional flyback converter [14]- [17], and a forward-flyback bidirectional converter [18] are implemented for various applications.…”

mentioning

confidence: 99%

Efficiency Optimization by Considering the High-Voltage Flyback Transformer Parasitics Using an Automatic Winding Layout Technique

Thummala

Schneider

Zhang

et al. 2015

IEEE Trans. Power Electron.

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Abstract-This paper presents an efficiency optimization approach for a high voltage bidirectional flyback dc-dc converter. The main goal is to optimize the converter for driving a capacitive actuator, which must be charged and discharged from 0 V to 2.5 kV dc and vice versa, supplied from a 24 V dc supply. The energy efficiency is optimized using a proposed new automatic winding layout ( Magnitude of negative flux density at the beginning of a switching cycle during charge process (T) ΔB Peak-to-peak flux density of the current excitation (T) Manusctipt

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Model-based control of a dual active bridge for bidirectional feeding of DEAP transducers

Maas

Hoffstadt

2014

2014 IEEE/ASME International Conference on Advanced Intelligent Mechatronics

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Power electronics concepts for driving EAP actuators

Cited by 7 publications

References 0 publications

Online identification algorithms for integrated dielectric electroactive polymer sensors and self-sensing concepts

Online identification algorithms for integrated dielectric electroactive polymer sensors and self-sensing concepts

Efficiency Optimization by Considering the High-Voltage Flyback Transformer Parasitics Using an Automatic Winding Layout Technique

Model-based control of a dual active bridge for bidirectional feeding of DEAP transducers

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